Electricity Safety Code · 2017. 10. 18. · NAMIBIAN ELECTRICITY SAFETY CODE, 2009: ELECTRICITY ACT, 2007 The Electricity Control Board has under section 3(4) of the Electricity

N$32.80 WINDHOEK-31October2011 No.4821

GOVERNMENT GAZETTEOf THE

REPUBLIC Of NAMIBIA

CONTENTSPage

GOVERNMENT NOTICE

No.200 ElectricityControlBoard:NamibianElectricitySafetyCode,2009:ElectricityAct,2007................ 1________________

Government Notice

ELECTRICITY CONTROL BOARD

No.200 2011

NAMIBIANELECTRICITYSAFETYCODE,2009:ELECTRICITYACT,2007

TheElectricityControlBoardhasundersection3(4)oftheElectricityAct,2007(ActNo.4of2007),madethecodesetoutintheSchedulewhichcomesintooperationonthefirstanniversaryofthedateofpublicationofthisNotice.

J. NANDAGOCHAIRPERSONELECTRICITY CONTROL BOARD Windhoek,12October2011

2 GovernmentGazette31October2011 No.4821

SCHEDULE

FOREWORD

ThisCodegovernstheminimumsafetystandardsfortheoperating,maintenance,constructionandinstallationofpowersystemsinNamibia.ThepurposeofthisCodeisthreefold,namely,toensurethesafetyofallpersons,tosafeguardapparatusandtoprovidecontinuityofsupply.

ThisCodeisanextensionof,andmustbereadinconjunctionwith,theprovisionsoftheElectricityAct,2007,andtheLabourAct,2007(withparticularemphasisonHealthandSafetyRegulationsmade thereunder), and all other applicable laws, anddoes not supersede, overrule or negate anyprovisionscontainedintheElectricityAct,theLabourActorsuchotherlaws.

ThisCodehasbeenproducedinloose-leafformat tofacilitateitsupdatingasandwhentheneedarises.

ServiceIssue1May2009

©ElectricityControlBoard.

No.4821 GovernmentGazette31October2011 3

CONTENTS

PAGEINTRODUCTION 6A. PurposeofCode 6B. CodeGovernanceFramework 6C. SafetyGovernanceOrganisationalStructure 7D. CompliancewithCode 8E. RevisionofCode 8F. GeneralInstructions 8

SECTION 1:DEFINITIONS 101.01 OfficialsandPersons 101.02 OperatingTerms 111.03 PrintedForms,BooksandNotices 25

SECTION 2:CONTROL OF A POWER SYSTEM 272.01 DutiesandResponsibilitiesofaSystemController 272.02 KeepingofRecords 282.03 IssueandReceiptofOperatingInstructionsandtheuseof OperatingInstructionForms 292.04 ControlofloadingofPowerStationsundernormalandabnormalconditions 332.05 Controlandloadingoftransmissionanddistributionapparatus 342.06 OrderofprecedenceinuseofCommunicationSystem 352.07 Commissioningofapparatusonfirstinstallationorafteralterationorrepair 352.08 UseofOperatingDiagram/Mimic 36

SECTION 3: ACCESS 373.01 Accesstolivechambersandprohibitedareas 373.02 Proceduresforaccesstolivechambersofpersonsotherthanpersonsauthorised 383.03 Proceduresforaccesstoprohibitedareasofpersonsotherthan personsauthorised 383.04 Dutiestoperformwhengainingaccesstoprohibitedareasorlivechambers 383.05 Stayingovernightinlivechambersorprohibitedareas 393.06 ElectricFences 393.07 Proceduresforaccessofpersonstorestrictedareasotherthanpersonsauthorised 40

SECTION 4:KEYS 414.01 IssuingAndControlOfMasterKeys 414.02 IssuingAndUseOfStationKeys 41

SECTION 5:WORK PERMITS 425.01 CircumstancesWhenAWorkPermitIsRequired 425.02 FormsInDuplicate 425.03 UseOfWorkPermitForm 42

SECTION 6: AUTHORISED OPERATIONS 486.01 Personsauthorisedtoperformswitching,linking,safetytestingand earthingoperations 486.02 Procedureforworkinlivechambers 486.03 Makingfeedersandapparatussafetoworkon 486.05 Exemptionfromgeneralprocedure 686.06 Supervisionofwork 696.07 Temporaryabsenceofpersonsinchargeofwork 696.08 TestingApparatus 706.09 Nooperatingwhileworkisinprogressinlivechamber 70


SECTION 7:ABNORMAL CONDITIONS 717.01 Abnormalconditionstobereportedtosystemcontroller 717.02 EmergencySwitching 717.03 CommunicationSystem 717.04 Restorationofsupplyintheabsenceofcommunication 727.05 Establishmentoflocalcontrolcentre 72

SECTION 8:LIVE WORK 738.01 Definitions 738.02 Abnormalconditionstobereportedtosystemcontroller 758.03 Liveworkatpowerstationsoronthedistributionsystem 758.04 Supervisionoflivework 78

SECTION 9:DESIGN AND CONSTRUCTION 809.01 General 809.02 NormativeStandards 809.03 EquipmentandMaterial 829.04 ClearancesofPowerLines 829.05 Conductorsandearthwiresforpowerlines 879.06 PowerLineStructures 899.07 FoundationsforPowerLine 919.08 InsulatorsandFittings 929.09 StayWires 949.10 Earthing 95

ANNExURES 98Annexure1:OperatingInstructionForm 98Annexure2:OperatingAuthority 99Annexure3:WorkPermitForm 100Annexure4:Worker’sDeclaration 101Annexure5:ControlPanelLabel/Tag 102Annexure6:LiveWorkDeclarationForm 103Annexure7:IndemnityForm-SingleVisitors 105Annexure8:IndemnityForm-MultipleVisitors 106Annexure9:Abbreviations 107


INTRODUCTION

A. PURPOSE OF CODE

A.1 ThisCodegovernstheminimumsafetystandardsfortheoperating,maintenance,constructionandinstallationofpowersystemsinNamibia.ThepurposeofthisCodeisthreefold,namely,toensurethesafetyofallpersons,tosafeguardapparatusandtoprovidecontinuityofsupply.

A.2 ThisCodeisanextensionof,andmustbereadinconjunctionwith,theprovisionsoftheElectricityAct,2007,andtheLabourAct,2007(withparticularemphasisontheHealthandSafetyRegulationsmadethereunder),andallotherapplicablelaws,anddoesnotsupersede,overruleornegateanyprovisionscontainedintheElectricityAct,theLabourActorsuchotherlaws.

B. CODE GOVERNANCE FRAMEWORK

ThefollowingdiagramillustratestheextentofinteractionamongthekeystakeholdersintheNamibianElectricityIndustryasfarastheadministrationandenforcementofelectricitysafetystandardsareconcerned.

C. SAFETY GOVERNANCE ORGANISATIONAL STRUCTURE

C.1 Thefollowingorganogramservestoillustratefromasafetygovernanceperspective,anditmipamongthevarious‘Keyroleplayerswithintheorganisationalstructureofalicensee.

C.2 The vertical and/or horizontal extension or curtailment of this structure dependslargelyonthesizeanduniqueorganisationalstructureofeachlicensee.


D. COMPLIANCE WITH CODE

ThisCodeentersintoforceandbecomescompulsoryonthesecondanniversaryofthedateofpublicationthereofintheGovernmentGazette.

E. REVISION OF CODE

E.1 ThisCode is revised annually by theElectricityControlBoard (ECB)on a datedetermined by the ECB after consultationwith the StandingWorkingGroup onElectricitySafetyregardingitsscope,contentandimplementation.ThemembershiporganisationsofthisWorkingGroupare:

ECB(Chair)MinistryofLabourMinistryofMinesandEnergyNamPowerNOREDErongoREDCENOREDMarientalMunicipality/SOREDCityofWindhoek

E.2 Arevisionof thisCodemust,before theapprovalof theMinisterresponsibleformines and energy is sought under section3(4) of theAct, be consultedwith theMinisterresponsibleforlabourandtheLabourAdvisoryCouncil.


E.3 ArevisionofthisCode,orpartthereof,isissuedinprint,publishedintheGovernmentGazetteintermsofsection3(4)anddistributedbytheECBtoalllicensees.RevisioncontrolisexercisedbytheECB.

F. GENERAL INSTRUCTIONS

F.1 Every licensee shall be in possession of a copy of this Code and all relevantlegislation pertaining to the Namibian Electricity Industry. The licensee isresponsible for complyingwith theminimum safety standards prescribed in thisCodeandforensuringthatallrelevantroleplayerswithinthelicensee’sorganisationareacquaintedtherewith.

F.2 ThelicenseemayassigninwritingtheresponsibilityforenforcingcomplianceandadherencetothesafetystandardsprescribedinthisCode.

F.3 Where an interconnection exists between two or more power systems, whetherbetween two licensees or between a licensee and another power producer ordistributor,appropriatecommunicationandcoordinationmeansmustbeestablishedandmaintainedwithregardtooperationalmattersunderjointauthority.

F.4 AbbreviationsusedinthisCodearereflectedinAnnexure9.

F.5 Ifsorequiredbythecontext,anyreferencetothesingularincludesthepluralandviceversa,andanyreferencetothepresenttenseincludesthepastandfuturetensesandviceversa.

F.6 Wheretheword“include”or“including”isusedinthisCode,itmeans“includeswithoutlimitation”or“includingwithoutlimitation”.

F.7 Wheretheword“should”isusedinthisCode,itmeansarequirementwhichneedstobeequalledorexceededsothatanobligationisdischarged.IfthisCodestatesthatsomething“shouldbedone”,therequirementistodowhatthisCoderequiresordoitinamannerwhichisequaltoorbetter(electricallysafer)thanprescribedinthisCode.

F.8 Wheretheword“must”isusedinthisCode,itmeansamandatoryrequirement.

F.9 Wheretheword“shall”isusedinthisCode,itmeansanobligatoryactionorseriesofactionswithoutalternatecourseordeviationfromthesafetystandardinquestion.

F.10 Acleardistinctionmustbeobservedbetweencertainwords, suchas“earth”and“earthing”,andmustnotbemisinterpretedasbeing thesame termorhaving thesamemeaningorreferringtothesameaction,applicationorobject.

SECTION 1: DEFINITIONS

1.01 OFFICIALS AND PERSONS

InthisCode,includingitsintroduction,unlessthecontextotherwiseindicates-

1.01.1 appointed operator (A/O)meansaqualifiedpersonauthorised tocarryout safeoperatingonthepowersystemofalicenseeoninstructionofthesystemcontrollerinaccordancewiththisCode;

1.01.2 authorised person(A/P)meansaqualifiedpersonauthorisedtoaccessastationtoperformdesignatedfunctionsinaccordancewiththisCode;


1.01.3 competent person means a person certified in writing by an inspector to becompetenttoperformaspecifictask;

1.01.4 contractormeansapersoncontractedtodoworkonapowersysteminaccordancewiththisCode;

1.01.5 consumermeansanenduserofelectricitywhoconsumessuchelectricity;

1.01.6 customermeansapersontowhomelectricityisdeliveredbyalicensee,andincludesaconsumer;

1.01.7 inspectormeansapersonappointedasalabourinspectorundersection124oftheLabourAct;

1.01.8 licenseemeanstheholderofanelectricitylicenceissuedundertheElectricityAct;

1.01.9 MinistermeanstheMinisterresponsibleforenergy;

1.01.10 official in chargemeansaqualifiedpersonemployedbyalicensee,whois-

1.01.10.1 inchargeofadefinedsectionofapowersystem;and1.01.10.2 authorised to make decisions and give instructions on deviations from normal

operatingprocedures;

1.01.11 power station control room officialmeansapersondeployedbyalicenseeinthepower station control roomandgenerally in control of the operationof a powerstationinaccordancewiththisCode;

1.01.12 qualified personmeansapersonwhoisabletosubmitdocumentaryproofthatheorshehas-

1.01.12.1 receivedappropriatetheoreticalandpracticaltraining;and1.01.12.2 gainedadequateexperienceinelectricitysafety;

1.01.13 responsible official(R/O)meansaqualifiedpersonemployedbyalicensee,whoisresponsibleforensuringcomplianceandauthorisingpersonstoensurecompliancewiththisCode,andintheeventofnosuchpersonbeingemployedbythelicensee,means,inthecaseofthelicenseebeing:

1.01.13.1 Acompany,themanagingdirectororchiefexecutiveofficer;1.01.13.2 aclosecorporation,themanagingmember;1.01.13.3 atrust,thechairpersonoftheboardoftrustees;1.01.13.4 apartnership,themanagingpartner;1.01.13.5 aproprietorship,theowner;1.01.13.6 an association, the chairperson of the executive committee or management

committee;or1.01.13.7 aco-operative,thechairpersonoftheboardofdirectors;

1.01.14 responsible person (R/P)means a personwho has been authorised to work onapparatuscoveredinaworkpermitoraliveworkdeclaration;

1.01.15 responsible employee (R/E) means a person employed by a licensee, who isresponsibleforensuringthatanyworkonapparatusintermsofthisCodecanbecarriedoutwithsafety;


1.01.16 systemcontroller(S/C)meansapersononduty,whoisresponsiblefor-

1.01.16.1 thegeneraloperationandcontrolofapowersystem;and1.01.16.2 theissuingofinstructionstoanappointedoperatororauthorisedpersonforthesafe

operationofgeneration,transmissionanddistributionsystemsinaccordancewiththisCode;

1.01.17 workermeansapersonemployedtoworkonapowersystem.

1.02 OPERATING TERMS


1.02.1 accessmeansauthorisedentryintoaprohibitedarea,livechamberorstationonapowersystem;

1.02.2 access lockmeansalockthatformspartofaseriesoflockspermittingaccesstoprohibitedareasorstations,whichcanonlybeopenedwithamasterkeyfor theseriesoflocks;

1.02.3 additional earthmeansaregisteredearthorearthinggearthatmaybeappliedtoabusbaroralinewiththepriorapprovalofasystemcontroller;

1.02.4 alivemeanselectricallycharged,andlivehasasimilarmeaning;

1.02.5 apparatusmeansany-

1.02.5.1 electricalequipmentsuchasgeneratingplant,switchgear,transformer,regulatinggear,busbar,cluster-bar, feeder, line,auxiliaryapparatus, includingallassociatedcontrolandprotectionequipment,operatedatdifferentvoltages;or

1.02.5.2 anyotherapparatusinstalledonasite,formingpartofapowersystem;

1.02.6 approved meansapprovedinwritingbyalicensee;

1.02.7 authorisedmeansauthorisedinwritingtoperformpredefinedduties;

1.02.8 authorised operationmeans anywork executed under instruction of the systemcontroller;

1.02.9 auto-reclose(ARC)meansapresetfunctionappliedoncertainbreakersorreclosers,whichallowsautomaticreclosureofthebreakersorreclosersafteropeningonfaultoccurrences;

1.02.10 auxiliary apparatusmeanssecondaryapparatus,andincludesauxiliarysupplyoranysupportingapparatusinastationforensuringtheproperfunctionofapparatus,suchasprotectionschemes,controlsystems,communicationsystemsandAC/DCsupplies;

1.02.11 barricade meansbarrier,andbarricadedhasasimilarmeaning;

1.02.12 barriermeansanapproveddevicedesignedtorestrictapproachtoliveapparatus;

1.02.13 basic insulation level(BIL)meansaspecificinsulationlevel,expressedinkilovolt (kV),towhichapowersystemisdesignedandconstructed;


1.02.14 baymeansalltheapparatusinthesamecircuitsituatedinoneormorefloorsina buildingorthroughastructure,fromandincludingthebusbarlinks;

1.02.15 breakermeansadevicedesignedtomake,carryorbreakelectriccurrentboth undernormalandfaultconditions,andrecloserhasasimilarmeaning;

1.02.16 busbar means a conductor or group of conductors that serves as a commonconnectionfortwoormorecircuitswithinastation;

1.02.17 cablemeansafeeder,normallyunderground,andincludestheterminations;

1.02.18 chambermeansanenclosureinwhichapparatusisseparatedfromotherapparatusbypartitionwallsorothermeans,theaccesstowhichisrestrictedbyinterlocks;

1.02.19 circuitmeansthearrangementofconductorsandapparatusfromandincludingthebladesofall linksor thecontactsofotherapparatusprovidedforcompleting theconnectiontothebusbar;

1.02.20 circuitbreakermeansbreaker;

1.02.21 close proximitymeansapositioninwhichanybodypartofapersonortoolbeingusedbyapersonmayinadvertentlybreachtheminimumsafeworkingclearance;

1.02.22 cluster-bar meansthecentralconnectionpoint,mountedonapoleatapointbelowaperson’sfeet,wherealltheclampsoftheportableearthsbetweentheearthspikeandtheconductorsareconnected;

1.02.23 commissioning means the pie-determined sequence of inspections, tests andenergisingproceduresdesignedfor theintegrationofnewapparatus intoapowersystem;

1.02.24 communication setincludesatelephone,cellularphone,radiooranyotherdevicedesignedforcommunicationpurposes;

1.02.25 connectmeansmakinga connectionor seriesof connections toobtain electricalcontinuityinacircuit,orbetweenapparatus,orbetweenapparatusandearth;

1.02.26 conductormeans anybar, pin, tube, socket,wire, jumper, dropper, cableor lineusedforconductingelectricity,whichissoarrangedtobeconnectedtoasourceofelectricalpotential;

1.02.27 consumptionmeanselectricityconsumedinkilowatthour(kWh);

1.02.28 control centre means a place from where the safe operation of generation,transmissionordistributionofelectricitytocustomersiscontrolledordirected;

1.02.29 control panel means the panel onwhich auxiliary apparatus aremounted, suchascontrolswitches,protectiverelays,measurementdevicesorotherequipmenttocontrol,measureandprotectapparatus,andincludesaprotectionpanel,aninterfacepanel,asupplementarypanel,amimicpanel,ameteringpanelandanalarmpanel;

1.02.30 control switchmeansaswitchprovidedforcontrollingtheoperationandfunctionofapparatusandauxiliaryapparatus;


1.02.31 dangermeansariskoflossofhumanlife,bodilyinjuryordamagetohealthfromelectricshock,burnoranyhazardouscondition,orlossofordamagetoapparatus,arisingfromtheprovisionoruseofelectricity;

1.02.32 dead means that any apparatus so described is at or about zero potential anddisconnectedorisolatedfromallpossiblesourcesofelectricalpotentialoranylivepowersystem;

1.02.33 de-energisedmeansthattheapparatusisnotelectricallyconnectedtoalivepower systemandhasnotbeendischarged,isolated,safetytestedorearthed;

1.02.34 dischargedmeans-

1.02.34.1 connectedtoearthandthattheapparatusisfreeofanyresidualorinducedelectricalpotential;and

1.02.34.2 thatstoredenergyhasbeenreleased,suchasaclosingspringinabreaker,hydraulic,pneumaticorgaspressure ina system,orenergystored inabatteryorcapacitorbank;

1.02.35 disconnectedmeansapparatusisnotconnectedtoasourceofelectricalpotentialachievedbytheremovalofaconnectionorseriesofconnectionstherebyinterruptingor breaking electrical continuity in a circuit, or between apparatus, or betweenapparatusandearth,butmaystillhavetobedischarged;

1.02.36 distribution,inrelationtoelectricity,meanstheconveyanceofelectricitythroughadistributionsystem,whichconsistswhollyormainlyofmediumandlowvoltagenetworks,toacustomer;

1.02.37 distribution systemmeansthenetworkofstations,transformers,linesandcableswherebyelectricityisdistributedtoacustomer;

1.02.38 double circuit structure means a structure supporting two circuits of the samevoltage on the same structure but situated on opposite sides of the centre of thestructure;

1.02.39 droppermeansaconductorinstalledtoconnectapparatustoalineorabusbar;

1.02.40 drop out fusemeansasinglephasepolemountedoutdoorairinsulatedmechanicallyoperateddevicechargedwithafuseforprotectingapparatusintheeventofafaultoccurrence;

1.02.41 earth -

1.02.41.1 asanoun,meansthegeneralmassoftheearthandisregardedtobeatzeropotential;1.02.41.2 asaverb,meansapplyingearthinggearorconnectingapparatustoearthinamanner

thatwillensureanimmediatesafedischargeofelectricalenergyatalltimes;

1.02.42 earth matmeans thesubterraneanconductivematerial installed inastation,atastructureoronatransformer,pylonorpoleorunderalinetoensurethataconnectioncanbemadebetweenapparatusandearth;

1.02.43 earthing gear meansthefixedorportableearthingdevices,suchasearthinglinks/switchesorportableearths,usedforearthingapparatus;

1.02.44 earthing link/switchmeans earthing gear,mechanically or electrically operated,permanentlyconnectedatonepointtotheearthmatanddesignedtoearthapparatus;


1.02.45 earth spikemeansacoppercladsteelrod,ofadequatecurrentcarryingcapacity,which is driven into the ground to ensure that an electrical connection is madebetweenapparatusandearth;

1.02.46 electric fencemeansafenceonwhichanelectricfenceenergiserisconnectedtodeliveraperiodicnonlethalamountofelectricitytothefencetopreventunauthorisedaccesstocertainareas;

1.02.47 electrical connection means the permanent or temporary connection betweenapparatusorapparatusandearththusprovidingacontinuouspathwherebyanyformofelectricalenergy,chargeorcurrentflowcanbeconductedsafely;

1.02.48 Electricity ActmeanstheElectricityAct,2007(ActNo.4of2007),asamendedorsubstituted;

1.02.49 emergency means a situation where danger can only be avoided by immediateaction;

1.02.50 emergency switchingmeanstheopeningonlyofsuchbreaker,recloser,switchorsimilardeviceasmaybenecessarytoavoiddanger;

1.02.51 enclosuremeansanyroom,chamber,yardorenclosedareainwhichitispossibleforapersonfromground/floorleveltomakeinadvertentcontactwith,orcomeintocloseproximityofliveconductorsorapparatus;

1.02.52 energisedmeansapparatusisconnectedtoalivepowersystemandisinservice;

1.02.53 exportmeanstheprovisionofelectricitytocustomersoutsidethephysicalbordersofNamibia;

1.02.54 factor of safetymeans the ratio of a component’s failing load to themaximumworkingloadforwhichithasbeendesigned;

1.02.55 fault meansanunplannedoccurrenceordefectinanitemwhichmayresultinoneormorefailuresoftheitemitselforofassociatedapparatus;

1.02.56 feedermeansabay,apowerlineoracable,whetherundergroundornot-

1.02.56.1 inorfromastation;or1.02.56.2 betweentwoormorestations;or1.02.56.3 fromastationtoacustomer,andincludesallstructures,supports,conductorsand

relatedhardware;

1.02.57 footing resistancemeanstheresistancebetweenastructureandearth;

1.02.58 frequencymeansthecyclicfrequencyofasinusoidalwaveformoveraperiodofonesecond(cycles/second),expressedinHertz(Hz);

1.02.59 generation,inrelationtoelectricity,meanstheproductionofelectricitybywayofnaturalorartificialprocesses;

1.02.60 generating plantmeansapparatusdesignedforthepurposeofgeneratingelectricityandincludesallsupportapparatus;


1.02.61 ground/floor level means the general surface a person walks on, including astructureorapparatusplinthotherthanastructureorapparatusplinththathasbeenconstructedtoobtainsafeworkingclearanceorsafegroundclearance;

1.02.62 hand backmeans the transferof responsibility for apparatus, as specified in thehandout,byanappointedoperatororauthorisedperson to thesystemcontroller,detailingallworkperformedandtherebyauthorisingthesafereturnoftheapparatustoservice;

1.02.63 hand outmeansthetransferofresponsibilityforspecificapparatusbythesystemcontroller to an appointed operator or authorised person,whereby the appointedoperatororauthorisedpersonisauthorisedtoworksafelyontheapparatus;

1.02.64 hand overmeans thedetailed confirmationbyanappointedoperator, authorisedperson or responsible person to the system controller that new or refurbishedapparatusisreadytobecommissionedandplacedinservicewherebysuchapparatuswillbecometheresponsibilityofthesystemcontroller;

1.02.65 Health and Safety RegulationsmeanstheRegulationsrelatingtotheHealthandSafetyofEmployeesatWork,1997,asamendedorsubstituted;

1.02.66 high voltagemeansavoltageofmorethan44000volt(RMS);

1.02.67 human machine interface(HMI)meansacomputer,normallyinastationorcontrolcentre-

1.02.67.1 onwhichisdisplayedthelayoutandoperationalstateofapparatusinastationorapowersystem;and

1.02.67.2 whichrecordseventsandallowsremotemonitoringandoperationofcertain apparatus;

1.02.68 import means the supply of electricity to Namibia from electricity providers,independent power producers or power utilities outside the physical borders ofNamibia;

1.02.69 incident meansaworkrelateddetrimentaloccurrence;

1.02.70 in commissionmeansapparatusisavailableforimmediateuse,althoughitmaynotactuallybeinservice;

1.02.71 inductionmeanstheelectricalchargeproducedinaconductorduetothevariationofamagneticfieldinitsvicinity,suchasinadjacentcircuitsandstaticchargebuildupduetoweatherconditions;

1.02.72 in servicemeansapparatusisenergisedandinuse;

1.02.73 insulated means covered, enclosed, surrounded or apparatus supported withinsulatingmaterialofsuchthicknessandpropertiesthatitwillpreventtheflowofelectricalenergyorpotentialbetweentheobjectsocoveredanditssurroundingsoranyexternalobject incontactwithit, includingthepreventionofmakingcontactwithearth;

1.02.74 insulating materialmeansanynon-conductivematerialsuchasglass,porcelainorothercompositematerialused forcovering,enclosing,surroundingorsupportingapparatusorpartthereof;


1.02.75 insulator meansadevicemadefrominsulatingmaterialdesignedto-

1.02.75.1 obtaintherequiredbasicinsulationlevel;and1.02.75.2 preventelectricalcontactbetweenalivepartanditssurroundings;

1.02.76 interlock means a mechanism, whether operated mechanically, electrically,electronically, computer softwaredrivenor anycombination thereof,designed toensurethesafeexecutionofapredeterminedsequenceofoperations;

1.02.77 interlocking lock meansaseriesoflocksinastationforwhichonlyonespecifickeyexiststoperformsafeoperationsonaninterlockingsystem;

1.02.78 in writingmeanshandwritten,typedorprinted,dulysignedanddated,andincludesatransmissiontotheintendedrecipientconcernedbymeansoffacsimileorelectronicmail;

1.02.79 isolate means disconnecting apparatus from all possible sources of electricalpotentialtocreateavisiblegapbetweenalivepartandade-energisedpart,whichmaybeobtainedby-

1.02.79.1 openingorremovingfusesordropoutfuses;1.02.79.2 openinglinks,isolatorsordisconnectors;1.02.79.3 removingdroppersorjumpers;1.02.79.4 openingairbreakswitches;1.02.79.5 withdrawingtruck-typeswitchgear;1.02.79.6 immobilisingbreakershavingvisiblecontactseparation,andnotfittedwithgrading

capacitors;1.02.79.7 utilising an approved changeover breaker, switch, link or similar device with

mechanicalinterlock,

andifcontactseparationisnotvisibleduetodesignorphysicalconstructioncriteria,isolationisdeemednottohavebeenachievedunlessacombinationofatleasttwoofthefollowingdisplaysindicatesimultaneouslythatcontactseparationhasindeedtakenplace:

1.02.79.8 Externalmechanicalindicator;1.02.79.9 electro-mechanicalindicator;1.02.79.10 electricaloperatedpositionindicator;1.02.79.11 electronicdisplaybyHMIorbaycontroller;

1.02.80 isolatormeansadeviceprovidedfor thepurposeof isolatingapparatusfromthesourceofsupply;

1.02.81 jumper meansaconductorinstalledbetweenvariousapparatustocreatecontinuity;

1.02.82 key meansakeyoranelectric,electronic,computersoftwaredrivenorotherdeviceusedinastationtooperatelocks;

1.02.83 kilowatt-hour(kWh)meanstheconsumptionofelectricalenergyequivalenttoonekilowattofpowersustainedforonehour;

1.02.84 Labour Actmeans the LabourAct, 2007 (ActNo. 11 of 2007), as amended orsubstituted,andincludestheHealthandSafetyRegulations;

1.02.85 line means an overhead feeder consisting of conductors, supports and relatedhardwarebetweenpowerstations,stationsandcustomers;


1.02.86 link means a device, such as an isolator, disconnector or similar disconnectingdevice,formakingorbreakingacircuitwhennoloadcurrentisflowing;

1.02.87 linkingmeans the opening or closing of a link, isolator, disconnector or similardisconnectingdevicewhennoloadcurrentisflowing;

1.02.88 live chamber means any chamber in which inadvertent human contact withconductors or live parts of apparatus working at high voltage is possible fromground/floorlevel;

1.02.89 live partmeansanyconductivepartofapparatus,whichisaliveandinnormaluse,andincludestheneutralconductor;

1.02.90 load currentmeansthecurrentflowinginacircuitthatisassociatedwithelectricityconsumption;

1.02.91 loadingmeansthematchingofelectricitygenerationanddemandofapowersystem;

1.02.92 local control centremeansatemporarylocationfromwheresafeoperationsonapre-definedsectionofapowersystemmaybecontrolledordirectedinaccordancewithparagraph7.05ofthisCode;

1.02.93 lock includesanaccess lock, an interlocking lock, amarriage lock, anoperatinglock,asafetylock,aservitudelockandauniquelock;

1.02.94 low voltagemeansavoltageof1000volt(RMS)orless;

1.02.95 made safe means de-energised, isolated and earthed as required to allow thenecessaryworktobecarriedoutwithoutdanger;

1.02.96 marriage lockmeansa lockplaced in serieswithanother lockallowingvariouspersonstohaveaccesstoservitudesandpremises,andmarriagelockinghasasimilarmeaning;

1.02.97 medium voltagemeansavoltageofmorethan1000volt(RMS)butnotmorethan44000volt(RMS);

1.02.98 operatingmeansswitching,linking,safetytestingandearthingoperationsinthatspecificorder;

1.02.99 operating diagram/mimicmeans thepermanentsingle linediagraminacontrolcentre or station indicating the operating position and operational state of allapparatus;

1.02.100 operating lockmeansalockformingpartofaseriesoflocks,operatedbyamasterkeythatgivesaccesstolivechambersandtocertainapparatusonlyforexclusivesafeoperationsbyanappointedoperator;

1.02.101 operating proceduresmeans approved detailed sequences for ensuring the safeoperatingofapowersystem,orpartthereof,whicharedevelopedandmaintainedbytheresponsibleofficial;

1.02.102 operatingstickmeansanapprovedinsulatedrodortelescopictubeto-

1.02.102.1 enablelinksandfusestobeoperated;or


1.02.102.2 carryoutsafetytestingandearthingoperations;

1.02.103 operation meansthesafeexecutionofatask,instruction,procedureandguidelineintermsofthisCode,andincludesthegeneralfunctionsofsystemoperations;

1.02.104 out of commission means apparatus taken out of service and not available forimmediateuse;

1.02.105 out of servicemeansapparatusconnectedtoapowersystembutnotpresentlyinuse;

1.02.106 piggyback systemmeansasystemwheremorethanonecircuitofdifferentvoltagesaresupportedonthesamestructure,excludinganydoublecircuitstructureandhighvoltagestructurecarryinglowvoltageconductors;

1.02.107 point of supplymeansanypointwhereapower systemora sectionofapowersystemcanbemadealive;

1.02.108 portable earth means amobile flexible earthing gear, whichmay be used as aregisteredearth,workingearth,additionalearthoranyothersafeearthingapplicationasmayberequired,andportableearthinggearhasasimilarmeaning;

1.02.109 power linemeansanelectriclinewhoseconductorsaresupportedaboveground,generally by means of insulators and appropriate supports erected to conveyelectricityforanyotherpurposethancommunication,butexcludingtheoverheadcontactorcatenaryconductorsofanelectrictractionsystem,andoverheadlinehasasimilarmeaning;

1.02.110 power stationmeansasiteonwhichelectricityisgenerated;

1.02.111 power station control room meansthepermanentlocationatapowerstationfromwherethesafeoperationsofthepowerstationiscontrolledordirected;

1.02.112 power system meanstheinterconnectedsystemcomprisingpowerstations,feeders,stations and apparatus used in connection with the generation, transmission,distributionandsupplyofelectricity;

1.02.113 prohibited areameansanormallyenclosedareainwhichliveconductorsorliveparts of apparatus are accessible, but situated in such a position that inadvertenthumancontacttherewithisnotpossible;

1.02.114 registered earthmeansanyearthinggearappliedorremovedoninstructionfromasystemcontroller;

1.02.115 remote control means the operation or operating of apparatus from a place notimmediatelyadjacenttotherelatedapparatus;

1.02.116 restricted area meansanareaotherthanalivechamberoraprohibitedarea,whichisenclosedforthepurposeofpowersystemsecurityandthesafetyofpersons;

1.02.117 safe working clearancemeanstheminimumsafedistancetobeobservedbetween-

1.02.117.1 differentlivepartsofapparatus;or1.02.117.2 livepartsofapparatusandearth,

topreventashort-circuitorinadvertenthumancontactwithsuchliveparts;


1.02.118 safety lockmeansalockusedforsafeoperationsinapowerstationforwhich-

1.02.118.1 onlyonespecifickeyisinuse;and1.02.118.2 amaster keymay be used under extreme circumstances to override the specific

safetylock;

1.02.119 safety panel means apparatus or a line that has been isolated and earthed as aprecautionarymeasure toprevent contactwith the livehighvoltageapparatusorlinewhere there is a riskof encroaching inpersonorwithmachineryorobjectsonthesafeworkingclearancewhenworkisbeingperformednearorclosetosuchapparatusorline;

1.02.120 safety testingmeansthetestingofapparatustoascertainwhetheritisaliveordeadbymeansofapprovedtestequipmentprovidedforthispurpose;

1.02.121 sectionalisermeansaswitchintendedtoopenautomaticallytodisconnectpartofapowersystem,duringtheopentimeofarecloserorbreaker,whichhastripped,toclearafault;

1.02.122 servitude lockmeansalockformingpartofaseriesoflockstogainaccesstolineservitudesandisoperatedbyamasterkey;

1.02.123 shuttermeansamechanicallyoperatedsafetycoverfororonanorificetopreventaccesstolivepartsofswitchgear;

1.02.124 single-line diagram means a diagramdepicting the layout of a system,whetherpolyphaseornot,byuseofequivalentsinglelinesymbols;

1.02.125 source of supply meansthatportionofapowersystemfromwhichtheapparatuscanbemadealive;

1.02.126 special operating proceduresmeansanapprovedsequenceforensuringthesafeoperatingofapparatusatidentifiedstations,whicharedevelopedandmaintainedbytheresponsibleofficial;

1.02.127 stationmeansapowerstation,transmissionstation,distributionstation,switchingstation,isolatingstation,mobilestationorotherstationorsubstationwithapparatusmaintaining,controlling,supportingor formingpartofapowersystem,andmaycontaingeneratingplant,transformersorswitchingorlinkingapparatus;

1.02.128 staymeansasteelwire,rope,rodorotherdevicethatsupportsapoleorstructure;

1.02.129 supervisionmeans overseeing the actions of a person to prevent any danger orcontraventionofthisCode;

1.02.130 supply,inrelationtoelectricity,meansthedeliveryofelectricitytoacustomerasacommodity;

1.02.131 supply pointmeansthepointatwhichelectricityisreceivedbyacustomer;

1.02.132 switchmeansadevice,otherthanabreaker,designedformakingandbreakingaratedflowofelectriccurrent,and includesanairbreakswitch,aspringoperatedlink,aweightoperateddisconnector,aloadbreaklink,atransrupteroranysimilardevice;


1.02.133 switchingmeanstheopeningandclosingofabreaker,recloser,sectionaliser,switchorsimilarapparatus,andincludesoperatingauxiliaryapparatus;

1.02.134 trading, in relation to electricity,meansthewholesaleorretailbuyingandsellingofelectricity;

1.02.135 transmission, in relation to electricity,means the conveyance of electricity bymeansofatransmissionsystem,whichconsistswhollyormainlyofhighvoltagenetworksandelectricalplant,fromanenergysourceorsystemtoacustomer;

1.02.136 transmission line meansanoverheadpowerlineoperatingathighvoltagetotransferlargeamountsofelectricity;

1.02.137 transmission systemmeans thenetworkof stations, transformers, feeders, lines,cablesandotherapparatuswherebyelectricityistransmitted;

1.02.138 tripmeanstheopeningonlyofabreaker,recloser,switchorsimilardeviceactivatedbymeansofinstalledprotectiononoccurrenceofafaultonapparatus;

1.02.139 underground cablemeansanelectriclinewithinsulatedconductorsburieddirectlyintheground,orlaidincableducts,trenches,pipesortroughs;

1.02.140 unique lockmeansadedicatedlockforwhichonlyonekeyexists,toisolateandlockapparatusoracustomersupplypointfromapowersystemtoensuresafeseparatedoperations;

1.02.141 voltagemeanstheelectricpotentialbetweentwopointsthatgivesrisetotheflowofelectricityandwherespecified,theRMSvalueofthevoltage;

1.02.142 work meansallphysicalactivitiesinconnectionwithapparatus,excludingoperatingandothernon-dangerousactivities,whichwillnotaffect thehealthandsafetyofpersonsorthesafeoperationofapparatus;

1.02.143 working earthmeansthevisible,supplementary,portableearthinggearappliedonallsidesandascloseaspossibletothepointofwork;

1.02.144 workplace meanstheplacewherephysicalworkisdoneonapowersystem.

1.03 PRINTED FORMS, BOOKS AND NOTICES


1.03.1 authoritymeansaletterofauthoritysignedbytheresponsibleofficial,stipulatingthelevelofauthorityandresponsibilitieswithregardtooperations,services,accesstoprohibitedareasorlivechambersorliveworkonapowersystem,whichletterofauthority-

1.03.1.1 mayextendtoallvoltagelevelsfromthepointofgenerationuptoasupplypoint;1.03.1.2 isvalidforthemaximumperiodspecifiedbyalicensee;1.03.1.3 maybecancelled,alteredorwithdrawnatthediscretionofthelicenseeatanytime

duetoanymisconduct,resignation,transferoroperationalchange;

1.03.2 control panel label/tagmeansanoticedisplayedona controlpanel in a stationindicating that apparatus is being worked on and may indicate the position ofearthinggear;


1.03.3 indemnity formmeansaformthatmustbecompletedbyallpersonsasrequiredbythelicensee;

1.03.4 licence means a licence for the generation, transmission, trading, distribution,supply,importorexportofelectricity,issuedintermsoftheElectricityAct;

1.03.5 logbook means a book provided for keeping a record of all events, incidents,operations,operationcounterreadingsandrelatedactivities,whichisaccessibleatalltimes;

1.03.6 operating drawingmeansasinglelinediagramthatdepictsthelayoutofapowersystem,stationandlinesbetweenstationsandcustomersfortheissuingandexecutionofoperatinginstructions;

1.03.7 operating instruction form (OIF) means the printed form used for recordinginstructions issuedby a systemcontroller to an appointedoperator or authorisedpersonrelatingtotheoperationstobecarriedoutonapparatus;

1.03.8 recordmeansanyrecordingsystem,book,formorstatement,whetherprintedornot,tokeepallinformationanditsdailyactivitiesuptodate;

1.03.9 warning noticemeansanoticeprovided-

1.03.9.1 toindicateandwarnthatworkisinprogressonapparatus;or1.03.9.2 toindicateanyspecialoperatingconditioninforce;

1.03.10 work permit means a document permitting work to be carried out on specificapparatus,whichhasbeenpreparedinaccordancewiththisCodesothattheIntendedworkmaybecarriedoutwithsafety;

1.03.11 work permit form means the printed form containing the application, permit,clearance and worker’s declaration for the authorisation of work to be done onapparatusinaccordancewiththisCode;

1.03.12 worker’s declarationmeans a declaration signedby the appointedoperator, theresponsiblepersonandtheworkerconcerned,confirming-

1.03.12.1 thatapparatustobeworkedonwasmadesafe;and1.03.12.2 anunderstandingoftherestrictionsanddetailsoftheworktobecarriedout;

1.03.13 workers register means a register of workers assigned to do work, which iscompletedbyanauthorisedpersonoraresponsibleperson.

SECTION 2: CONTROL OF A POWER SYSTEM

2.01 DUTIES AND RESPONSIBILITIES OF A SYSTEM CONTROLLER

2.01.1 Thesystemcontrollershallberesponsiblefortheoverallcontrolofapowersystemand in addition to any other duties or responsibilities specified elsewhere in thisCode,forcarryingoutthefollowingduties:

2.01.1.1 Ensuringthesafetyofhumanlife,safetyofequipmentandthecontinuityofpowersupplytocustomers,inthatorderofpriority;

2.01.1.2 issuinginstructionsfortheloadingofgeneratingplantandthecontroloffrequencyandvoltageofthepowersystemunderhisorhercontrol;


2.01.1.3 issuinginstructionsassetoutinthespecialoperatingprocedures;2.01.1.4 issuinginstructionsforsafeoperationsonthepowersystemunderhisorhercontrol.

2.01.2 The following operations are regarded as exceptions and are not executed underdirectinstructionsfromthesystemcontroller:

2.01.2.1 Emergencyswitching;2.01.2.2 workingearthsonapparatus;2.01.2.3 operatingonauxiliaryapparatusinstationsbelow1000volt(RMS);2.01.2.4 operatingviasupervisoryremotecontrolperformedbyasystemcontroller;2.01.2.5 operatingunderthejurisdictionofanestablishedlocalcontrolcentre.

2.01.3 Before issuing any operating instruction to an appointed operator or authorisedperson,thesystemcontrollershallensurethatallpartieshavecorrespondingupdatedoperatingdrawingsintheirpossession.

2.01.4 Thesystemcontrollershallkeeparecordof-

2.01.4.1 thetimesanddetailsofalloperatingcarriedoutbythesystemcontrollerorunderhisorherinstructions;and

2.01.4.2 thenamesofthepersonsinstructedtocarryouttheoperating,andshallrecordandactuponallalarmsthatmayappearasaresultofsuchoperating.

2.01.5 Thesystemcontrollershallkeeparecordof-

2.01.5.1 thetimesanddetailsofallemergencyswitching;and2.01.5.2 thenamesofthepersonswhohavecarriedouttheemergencyswitching,andshall

record and act upon all alarms that may appear as a result of such emergencyswitching.

2.01.6 Thesystemcontrollershall-

2.01.6.1 updatetheoperatingdiagram/mimicinthecontrolcentreinsuchawayastoindicateatalltimestheoperationalstateofbreakers,switchesandlinksandthepositionofearthsthroughoutthesectionofthepowersystemunderhisorhercontrol;and

2.01.6.2 keeparecordofthenamesoftheappointedoperatorstowhomapparatusarehandedout.

2.01.7 Switchingofauxiliaryapparatusoranyworkcarriedoutonauxiliarycircuitsbyanauthorisedpersonshallbeconfirmedwiththesystemcontrollerandthehandoutandhandbackproceduresshallbefollowed.

2.01.8.1 Thesystemcontrollershallgive to therelievingsystemcontroller, for theproperdischargeofhisorherduties-

2.01.8.1.1 all the required information as to the stateof thepower systemunderhis or hercontrol;and

2.01.8.1.2 anyotherinformationthatmaybenecessary,

2.01.8.2 The relieving system controller shall obtain this information from the systemcontrollerandreadtherelevantentriesintherecords.


2.02 KEEPING OF RECORDS

2.02.1 Operating records

2.02.1.1 Arecordshallbemaintainedinthecontrolcentreof-

2.02.1.1.1 the names and contact details of all appointed operators, authorised persons andresponsiblepersons,togetherwiththeextentoftheirauthorisation;and

2.02.1.1.2 permanentandtemporarysettingsofallrelaysandprotectivegear.

2.02.2 Logbook

2.02.2.1 Thelicenseeshallprovidealogbookateachstationinwhichtheappointedoperator,theauthorisedpersonandtheresponsiblepersonshallrecordalloperatingorworkcarriedoutonapowersystem.

2.02.2.2 All operating performed by an appointed operator must be written down on anoperatinginstructionform,includingtheproceduresforapparatushandover,handoutandhandback,whichproceduresshallalsoberecordedinthelogbook.

2.02.2.3 Allswitchingoperationsperformedonauxiliaryapparatusbyanauthorisedpersonmustbewrittendownonanoperating instructionform, including theproceduresforapparatushandover,handoutandhandback,whichproceduresshallalsoberecordedinthelogbook.

2.02.2.4 Everyentryrelatingtotheapplicationofearthingdevicesshallstatethelocationinthecircuitwhereeachearthingdeviceisapplied.

2.03 ISSUE AND RECEIPT OF OPERATING INSTRUCTIONS AND THE USE OF OPERATING INSTRUCTION FORMS

2.03.1 Permission to operate

Nopersonshall carryoutanyoperatingoroperationonapower systemwithoutthe prior authorisation by the system controller, except in cases as stipulated inparagraph2.01.2ofthisCode.

2.03.2 Issueandreceiptofoperatinginstructions

2.03.2.1 Allinstructionsfromthesystemcontrollertoanappointedoperatororauthorisedpersonrelatingtooperatingoroperationofapparatusshallbegivenindetailandsequentiallywithoutabbreviation,stating-

2.03.2.1.1 thedate;2.03.2.1.2 thenameofthestation;2.03.2.1.3 theapparatustobeworkedon;2.03.2.1.4 thenatureoftheoperationtobecarriedout;2.03.2.1.5 thetimeofreceivingandcompletionoftheinstruction;and2.03.2.1.6 thesignatureandprintednameoftheappointedoperatororauthorisedperson.

2.03.2.2.1 Eachseparatestepintheinstructionshallbewrittenonanewlineontheoperating instructionform.

2.03.2.2.2 Operating instructions for switching and linking may be written on the sameoperatinginstructionformandinthatorder.


2.03.2.2.3 Safety testing and earthing instructionsmust be written on a separate operatinginstructionform.

2.03.2.3.1 Theinstructionsmustbereadbackbytheappointedoperatororauthorisedpersontothesystemcontroller,whoshallconfirmor,ifnecessary,correcttheinstructions.

2.03.2.3.2 Ifbothpartiesagreethattheexecutionoftheinstructionscanbeperformedsafely,theoperatinginstructionformreferencenumbermustbegiventothesystemcontrollerandtheinstructionsconfirmedwiththeissueofatime,whichmustbenotedasthetimereceivedforcommencement.

2.03.2.3.3 Theformmustthenbesignedbytheappointedoperatororauthorisedperson.

2.03.2.4.1 The instructions may be pre-written on the operating instruction form by theappointedoperatororauthorisedpersondoingtheoperating,orpersonauthorisedtotransmitoperatinginstructions.

2.03.2.4.2 Iftheinstructionshavebeenincorrectlypre-written,theymustbecancelledandre-writtencompletelyonanewoperatinginstructionformunderinstructionfromthesystemcontroller.

2.03.2.5 Acopyoftheoperatinginstructionformshallremainadjacenttothecommunicationsetuntilcompletionoftheoperatingdetailedonit.

2.03.2.6.1 Theoriginaloftheoperatinginstructionformshallbetakentotheplacewheretheoperatingistobecarriedout.

2.03.2.6.2 The instructions shall be read by the appointed operator or authorised personcarrying out the operating, who shall verify that the apparatus and the intendedoperatingcorrespondwiththewritteninstructionbeforetheoperatingdetailedontheoperatinginstructionformiscommenced.

2.03.2.7 Eachinstructionontheoperatinginstructionformshallbecarriedoutinitsentiretywithoutunduedelayandeachitemasdetailedontheoperatinginstructionform

shallbetickedoffaseachstepofoperatingiscompleted.

2.03.2.8.1 Whenapersonisbeingtrained,boththeappointedoperatororauthorisedpersonand the traineeshallsatisfy themselves that theapparatusand intendedoperatingcorrespondwith the instructionas receivedfromthesystemcontrollerbefore theoperatingiscommenced.

2.03.2.8.2 Theoperatinginstructionformshallbesignedbythetraineeandcountersignedbytheappointedoperatororauthorisedperson.

2.03.2.8.3 Nooperatinginstructionsshallbeissuedbyonetraineetoanothertrainee.

2.02.2.9 Intheeventofanunforeseendelayintheexecutionoftheinstructionsintheirentirety,theoperatingmustbe terminatedand thecause reported to the systemcontrollerwhereupontheexistinginstructionsmustbecancelledandnewinstructionsissued.

2.03.3 Report back on completed operating

2.03.3.1 The system controller shall be informed as soon as possible after an operatinginstructionhasbeencompleted.


2.03.3.2 Reportbackoncompletedoperatingshallbegiveninfulltothesystemcontrollerbytheappointedoperatororauthorisedpersonandalldetailsloggedaccordingly.

2.03.3.3 Thesystemcontrollershallthenissuethecompletiontimetotheappointedoperatororauthorisedperson.

2.03.3.4 Theoriginaloperatinginstructionformrelatingtoacompletedoperatingshallberetained for aminimum period of sixmonths at the location determined by thelicensee.

2.03.3.5 Each completed operating instruction book containing the copies of operatinginstructionformsmustbearchivedforaperiodoffiveyears,whereafteritmaybedestroyedifnoqueryhasarisenregardinganyentriesduringthattime.

2.03.4 Relay of operating instructions through a third person

Where operations are required on a power system in the absence of directcommunication between the system controller and the appointed operator orauthorisedperson,therelatedoperatinginstructionsmayberelayedthroughathirdperson,inwhichcasethethirdpersonshallrelaythepreciseoperatinginstructionsandindoingso,complyundertheguidanceofthesystemcontrollerwiththerelevantrequirementsspecifiedinthisCode.

2.03.5 Issue and receipt of pre-authorised instructions

2.03.5.1 In theeventofpoorornocommunicationbetween thesystemcontrollerand theappointed operator or authorised person when operating is required on a powersystemandtherelayofoperatinginstructionsbyathirdpersonisnotpracticable,pre-authorisedoperatinginstructionsmaybeissued.

2.03.5.2.1 Pre-authorisedoperatinginstructionsmayonlybeissuedonthedaythattheoperatingtakesplace.

2.03.5.2.2 Thesystemcontrollerandtheappointedoperatororauthorisedpersonmaydiscussandpre-writetheinstructionsbeforehand.

2.03.5.2.3 Thepre-authorisedinstructionsshallonlyenterintoforceoncethesystemcontrollerhasauthorisedtheinstructionsbyissuingacommencementtime.

2.03.5.3.1 Pre-authorisedoperating instructions toanappointedoperator shallbe issued fortheswitching,linking,safetytesting,earthingorworktobeperformedanduponcompletion,thesequentialrestorationofapparatustoservice.

2.03.5.3.2 All operations and detail of thework performed shall be reported to the systemcontroller as soon as possible whereupon the system controller shall issue acompletiontime.

2.03.5.4.1 Pre-authorisedoperatinginstructionstoanauthorisedpersonshallbeissuedfortheswitchingorworktobeperformedanduponcompletion,thesequentialrestorationofapparatustoservice.

2.03.5.4.2 All operations and detail of thework performed shall be reported to the systemcontroller as soon as possible whereupon the system controller shall issue acompletiontime.


2.03.5.5.1 Intheeventoflossofsupplyduetoatriptomultiplecustomersonafeederwithonlyonesourceofsupply,apre-authorisedoperatinginstructionmaybeissuedtoanappointedoperator.

2.03.5.5.2 Thepre-authorisedoperatinginstructionshallapplytotheaffectedfeederonly.

2.03.5.5.3 Additionalappointedoperatorsmayassistunderinstructionoftheappointedoperatorinchargetorestorethesupply.

2.03.5.5.4 Thepre-authorisedoperatinginstructionincludespermissiontooperatethefeederbreaker,otherswitchgearorlinksinthesamecircuitasrequired.

2.03.5.6.1 Intheeventoflossofsupplytoasinglecustomerwithonlyonesourceofsupply,a pre-authorised operating instructionmaybe issued to an appointed operator torestorethesupply.

2.03.5.6.2 Thepre-authorisedoperatinginstructionshallapplytotheaffectedcustomersupplypointonlyasfromthetransformerdropoutfusestothecustomer.

2.03.6 Circumstances when an operating instruction shall be cancelled

2.03.6.1 Shouldthesafetyofpersonsorapparatusbeindangerduringtheexecutionofanyoperating instruction in circumstances other than those indicated in paragraphs2.03.2.4.1and2.03.2.4.2and2.03.2.9ofthisCode,alloperationsmustbeterminatedimmediatelyandtheoperatinginstructioncancelledeitherbythesystemcontrollerortheappointedoperatororauthorisedperson,whodetectedthedanger.

2.03.6.2 Thesystemcontrollershallthendeterminethefurtheractions.

2.04 CONTROL OF LOADING OF POWER STATIONS UNDER NORMAL AND ABNORMAL CONDITIONS

2.04.1.1 Thesystemcontrollerandthepowerstationcontrolroomofficialshallliaisecloselyregardingall events andconditions thatmayaffect the loadingof thegeneratingplantandcontinuityofsupply.

2.04.1.2 The system controller shall keep the power station control room official fullyinformedastotheprobabledemandwhichwillbemadeonthegeneratingplantinthepowerstationandthecapacityofsuchgeneratingplant,whichisrequiredtobeinreservetoensurethattheobligationofsupplyanddemandaremet.

2.04.2.1 Thepowerstationcontrolroomofficialshallnotifythesystemcontrollerregularlyastotheconditionofthegeneratingplant.

2.04.2.2 Any change, which may affect loading arrangements previously made, shall bereportedtothesystemcontrollerimmediately.

2.04.3.1 Intheeventofconditionsarisingwhichmayaffectthesafetyofthegeneratingplant,thepowerstationcontrolroomofficialshallbesolelyresponsibleforsohandlingand loading each portion of such generating plant to ensure its safety and shallimmediatelytakecorrectiveaction.

2.04.3.2 Thesystemcontrollermustbenotified,assoonaspossible,ofanychangeduringtheeventandnewarrangementsshallbemadefortheloadingofsuchgeneratingplant.


2.04.4.1 Forworkongeneratingplant, thepowerstationcontrol roomofficial shallmakethenecessaryarrangementswiththesystemcontrollerforthegeneratingplanttobetakenoutofcommission.

2.04.4.2 Oncompletionofthework,thepowerstationcontrolroomofficialshallnotifythesystemcontrollerthatthegeneratingplantisavailableforservice.

2.04.4.3 Shouldanydelayariseinreturningthegeneratingplanttoserviceaspre-arranged,thepowerstationcontrolroomofficialshallimmediatelyadvisethesystemcontrollerofthedelaysothatalternativearrangementsmaybemade.

2.04.5 Generatingplantshallbedeemedtobe-

2.04.5.1 outofcommissionimmediatelyafterthesystemcontrollerhasgivenpermissionforworktobecommencedthereon;

2.04.5.2 incommissionassoonasthesystemcontrollerhasbeenadvisedthatsuchgeneratingplantisavailableforservice.

2.04.6.1 Shouldabnormalconditionsariserequiringdeviationfromanypre-arrangedworkprogramme,allpartiesconcernedshalladjusttothealteredconditionsinthemostefficientandexpeditiousmanner.

2.04.6.2 Any alternative arrangements shall be reported to the system controller and allpartiesconcernedshallbeinformedofthealternativearrangements.

2.05 CONTROL AND LOADING OF TRANSMISSION AND DISTRIBUTION APPARATUS

2.05.1 Subjecttoparagraph2.01ofthisCode,theappointedoperatororauthorisedpersonshallberesponsibleforapparatusinserviceandtheloadingthereofateachstation.

2.05.2 Wheneverapparatushas tobe takenoutof commission forwhatever reason, theappointedoperatororauthorisedpersonshallmakearrangementswiththesystemcontrollerandthecustomersbeforehand,whereapplicable,topreventoverloadingofapparatusremaininginservice.

2.05.3 In an emergency, the system controller shall take the required action andwherenecessary, inconsultationwith theappointedoperatororauthorisedpersonat thestationandshall,assoonaspossible,notifytherelevantseniorofficials.

2.06 ORDER OF PRECEDENCE IN USE OF COMMUNICATION SYSTEM

Allcallsormessagesinconnectionwiththeoperationofapowersystem,toandfromthesystemcontroller,appointedoperator,authorisedpersonorpowerstationcontrolroomofficialonanycommunicationsystemshallatalltimesbegivenpreferencebythesystemcontrolleroverallothercallsormessages.

2.07 COMMISSIONING OF APPARATUS ON FIRST INSTALLATION OR AFTER ALTERATION OR REPAIR

2.07.1.1 Noapparatusshallbeplacedincommissiononfirstinstallationunlesstheapparatushasbeenhandedover,withpriorarrangement,byanappointedoperatororauthorisedpersontothesystemcontroller.


2.07.1.2 Allapparatusandcontrolpanelsmustbesuitably labelledand thecorrespondingoperating diagram/mimic and operating drawings updated before apparatus arehandedover.

2.07.2.1 Thesystemcontrollershallconfirmwiththeappointedoperatororauthorisedpersonthatallnecessarytestsforcommissioningwereconducted.

2.07.2.2 Thesystemcontrollershall logall relevant information, including thenamesanddesignationsofpersonsresponsibleforthetests.

2.07.3 Thesystemcontrollershallberesponsibleforarranging,wherenecessary,fortheapplicationoftemporarysettingsofrelaysonfirstinstallationofapparatus.

2.07.4.1 Whereapparatushasbeendisconnected fromapower system forpurposesotherthansectionalising,bytheremovalofdroppersorjumpersorbytheopeningoflinkswhicharelockedoutwithauniquelock,thekeyofwhichisinthecustodyofanappointedoperatororauthorisedpersonnotdirectlyinvolvedwiththeoperating,theapparatusshallbedeemednottobepartofthepowersystem.

2.07.4.2 Anyearthsnecessaryontheapparatusshallbetheresponsibilityofthepersoninchargeofthework.

2.07.5.1 The apparatus being installed shall onlybecome the responsibility of the systemcontrolleronceaconnectionismadebetweensuchapparatusandthepowersystemwherebyitbecomespossiblefortheapparatustobeenergised.

2.07.5.2 Suchapparatusshallthenbehandedovertothesystemcontrollerasbeingreadyforcommissioning.

2.07.6 Theappointedoperatororauthorisedpersonshallreportallrequireddetailsoftheapparatustothesystemcontrollerandthenumberandpositionsofappliedearthswhenhandingoverorhandingbacksuchapparatus.

2.07.7 Allearthsappliedontheapparatustobecommissionedshallhenceforthresortunderthesystemcontroller.

2.08 USE OF OPERATING DIAGRAM/MIMIC

2.08.1 The operating diagram/mimic at a control centre, power station control room orstationshallbeadjustedasmaybenecessarytoindicatetheexactoperationalstateofallapparatusonthepowersystemorinsuchstation.

2.08.2 In the event of operating being performed in any of the depicted stations, suchoperatingshallnotbedeemedtobecompleteduntiltheoperatingdiagram/mimicconcernedhasbeenadjustedandtherequiredwarningnoticesaffixedtoindicatethecorrectoperationalstateoftheapparatusaffected.

SECTION 3: ACCESS

3.01 ACCESS TO LIVE CHAMBERS AND PROHIBITED AREAS

3.01.1 Persons authorised to enter live chambers or prohibited areas

Onlypersonsauthorisedtodoso,mayenterlivechambersorprohibitedareas.


3.01.2 Informing the system controller when accessing a live chamber

Anappointedoperatorshallinformthesystemcontrollerafterenteringandbeforeleavingalivechamber.

3.01.3 Informing the system controller when accessing a prohibited area

Anappointedoperatororauthorisedpersonshallinformthesystemcontrollerafterenteringorleavingaprohibitedarea.

3.01.4 Locking of doors and gates

3.01.4.1 Every door andgate giving access to a live chamber or prohibited areamust beclosedandlockedatalltimes,exceptwhenpersonsauthorisedtodoso,haveenteredthelivechamberorprohibitedareawherebyitispermittedtoleaveagateordoorunlockedbutclosedtofacilitateemergencyexit.

3.01.4.2.1 Undernocircumstancesshallmarriagelockingbeappliedtoanyaccessdoor,gateorapparatusatorinalivechamber.

3.01.4.2.2 Marriage locking may be applied at or within certain prohibited areas whereapparatus,whichbelongstomorethanoneparty,ishoused.

3.01.4.2.3 Marriagelockingmaybeappliedatorwithinbarricadedsectionsofprohibitedareasonlywhereaworkpermithasbeenissued.

3.01.4.2.4 Marriagelockingofservitudegatesispermissibleinmutualagreementwiththelandowner.

3.02 PROCEDURES FOR ACCESS TO LIVE CHAMBERS OF PERSONS OTHER THAN PERSONS AUTHORISED

3.02.1 Accesstoalivechamberbyapersonotherthananappointedoperatorshallonlybepermittedwhenthepersonisaccompaniedanddirectlysupervisedbytheappointedoperatorsoauthorisedforaccessandsupervision.

3.02.2 Whenworkhastobeperformedinalivechamberbyapersonotherthananappointedoperator,thepersonshallonlybeallowedtoworkunderthedirectsupervisionofanappointedoperatorsoauthorisedforaccessandsupervision.

3.02.3.1 Noaccessorworkmaycommenceunlesstheliveapparatusinalivechamberhasbeenbarricadedsoastoaffordreasonableprotectiontotheworkersconcerned.

3.02.3.2 Inaddition,theworkersshallsigntheworker’sdeclarationasstipulatedinsection6ofthisCode.

3.03 PROCEDURES FOR ACCESS TO PROHIBITED AREAS OF PERSONS OTHER THAN PERSONS AUTHORISED

Accesstoaprohibitedareabyapersonotherthananappointedoperatororauthorisedpersonshallonlybepermittedwhenthepersonis:

3.03.1 Undersupervisionofanappointedoperatororauthorisedperson;

3.03.2 workingonground/floor levelunderaworkpermitwiththeworker’sdeclarationdulysignedandtheworkplacesuitablybarricaded;


3.03.3 protectedbybarricading,erected insuchawaytoensure that inadvertenthumancontact with live apparatus adjacent to the barricaded area is not possible fromwithinthebarriersandwithinsafeworkingclearance;

3.03.4 inasectionofaprohibitedarea,segregatedfromtheremainderoftheprohibitedareainwhichaccessorworkmustbecarriedout,inwhichcasethesectionoftheprohibited area no longer constitutes a prohibited area and no supervision by anappointedoperatorisrequired.

3.04 DUTIES TO PERFORM WHEN GAINING ACCESS TO PROHIBITED AREAS OR LIVE CHAMBERS

3.04.1 An appointed operator gaining access to a prohibited area, live chamber, stationorbuildingandanauthorisedpersongainingaccesstoaprohibitedarea,stationorbuildingmustobserve,logandreportabnormalitiesontheconditionofallwarningnotices,nameplates,locksandfencing,earthing,oilleakages,vegetation,obstacles,trenches, covers, air conditioning (if installed) and the general condition of thevisitedarea.

3.04.2 Anappointedoperatororauthorisedpersonmustdenyaccess toanyunidentifiedperson.

3.05 STAYING OVERNIGHT IN LIVE CHAMBERS OR PROHIBITED AREAS

3.05.1 Stayingovernightinalivechambershallnotbepermittedunderanycircumstance.

3.05.2 Stayingovernightwithinanyprohibitedareaorbuildingisnormallynotpermittedto any person, but an appointed operator or authorised person with or withoutaccompanyingpersonsmayundercertaincircumstancesstayovernight,if-

3.05.2.1 thelogbookisproperlyfilledindepictingclearlythecircumstancesthatrequiresthisexception;

3.05.2.2 thesystemcontrollerhasbeeninformed;3.05.2.3 thepersoninchargehasbeeninformed.

3.05.3 The appointed operator or authorised person and accompanying persons, if any,shallobservethefollowingrestrictionsatalltimes:

3.05.3.1 Noopenfireispermittedinthebuilding;3.05.3.2 openfiresforheatingorpreparationoffoodshallonlybepermittedinanareaoutside

thebuildingdemarcatedforthatpurposebythepersonincharge;3.05.3.3 noalcoholicbeverageispermittedinanyprohibitedarea,livechamberorbuilding.

3.06 ELECTRIC FENCES

3.06.1 Onlyafenceenergiserthatdeliversimpulsesofelectricitytoanelectricfence,whichareequaltoorwithinthefollowingvalues,maybeinstalled:

3.06.1.1 Peakvalueofvoltage:10kilovolt(10kV);3.06.1.2 maximumdurationofimpulse:50milliseconds(50ms);3.06.1.3 minimumintervalbetweenimpulses:0,75second;3.06.1.4 maximumquantityofelectricityperimpulse:2,5millicoulomb(2,5mC)(electrical

charge);3.06.1.5 maximumelectricitydischargeperimpulsemeasuredataresistanceof500ohms:8

Joule(8J).


3.06.2 Afenceenergiser-

3.06.2.1 mustbeconstructedsoastoexcludedustandwater;3.06.2.2 maynotbeinstalledinadustylocationoralocationwherethereisafirehazard.

3.06.3 Afenceenergiser,whichreceivesitselectricalchargefromapowersystem,maynotbeinstalled-

3.06.3.1 in locations where the energiser is likely to sustain mechanical damage or betamperedwith;

3.06.3.2 onanypoleofapowerorcommunicationlineexceptapolethatcarriestheconductoroftheenergiser;and

3.06.3.3 unlesstheoutputcircuitisisolatedfromthesupplybymeansofadouble-woundedisolatingtransformer.

3.06.4 Theearthofafenceenergisershallbefreeandatleasttwometresawayfromtheearthofanyotherapparatus.

3.06.5.1 Barbedwiremay not be electrified but only smoothwire or such article aswillenableapersontouchingittoletgoimmediately.

3.06.5.2 Smoothwireattachedtoabarbedwirefencemaybeelectrified.

3.06.6 Inthecaseofafenceenergiserreceivingelectricityfromabatterychargedbymeansofchargingapparatus,whichreceivesitselectricalchargefromapowersystem,thechargingapparatusshallbeofdouble-woundedisolationconstruction.

3.06.7 Whereanelectricfenceisinstalledalongapublicroadorinanurbanarea-

3.06.7.1 theelectrifiedwiresorarticles shall, as faras ispracticable,bemounted in suchpositionsthatpersonscannotinadvertentlycomeintocontacttherewith;and

3.06.7.2 noticesshallbedisplayedconspicuously,warningpeoplethattheareaisprotectedbyanelectricfence.

3.07 PROCEDURES FOR ACCESS OF PERSONS TO RESTRICTED AREAS OTHER THAN PERSONS AUTHORISED

Access to restricted areas shall be allowed only to a person who has obtainedpermissionthroughanauthorisedmethod.

SECTION 4: KEYS

4.01 ISSUING AND CONTROL OF MASTER KEYS

Theresponsibleofficialshallissueandcontrolallmasterstationkeys.

4.02 ISSUING AND USE OF STATION KEYS

4.02.1 Stationkeysshallonlybeissuedtospeciallytrainedpersonsonthewrittenauthorityofthepersonauthorisedbytheresponsibleofficialtoissuestationkeys.

4.02.2 Stationkeysshallonlybeissuedtoapersonotherthanaspeciallytrainedpersonwiththepriorwrittenapprovaloftheresponsibleofficial.

4.02.3.1 Theissuingofastationkeymustberecordedinalogbook,statingtowhomthekeyisbeingissuedandthetimeanddateofissue.


4.02.3.2 In all cases the signature of the person receiving the key and that of the personissuingthekeymustbeenteredagainsttherecord.

4.02.3.3 Similarly,whenastationkeyisreturned,itsreceiptmustberecordedinthelogbook.

4.02.4.1 Anypersontowhomastationkeyhasbeenissued,isheldsolelyresponsibleforsuchkeywhileinhisorherpossession.

4.02.4.2 Thepersonmaynotletanysuchkeypassoutofhisorherpossession.

4.02.5 The special operating procedures shall include without limitation, procedurespertainingto-

4.02.5.1 therequirementsofakeysafesystem;4.02.5.2 themarkingofkeysandlocks;4.02.5.3 theissuinganduseofkeysatstationsforlivechambersandprohibitedareas;4.02.5.4 thesurrenderorlossofkeys;and4.02.5.5 theuseofkeyswhenchangingoverbusbars.

SECTION 5: WORK PERMITS

5.01 CIRCUMSTANCES WHEN A WORK PERMIT IS REQUIRED

Aworkpermitisrequiredforallworkonapparatusorinlivechambersandprohibitedareas at anyplace in a power stationor on a transmission system, a distributionsystemoralowvoltagesystem,exceptasprovidedforinparagraph5.03.14ofthisCode.

5.02 FORMS IN DUPLICATE

5.02.1 Theappointedoperatorshallmakeoutworkpermitformsinduplicate.

5.02.2 Theauthorisedperson,responsiblepersonorcontractorshallretaintheoriginal.

5.02.3 Acopyshallbeleftintheworkpermitbook,whichshallberetainedbytheappointedoperatoruntilitiscancelled.

5.03 USE OF WORK PERMIT FORM

5.03.1 Applicationandpermit

5.03.1.1 When work under the permit procedure is to be carried out, the responsibleemployeeshallprovidetheappointedoperatorwithallthedetailstobefilledinontheapplication,confirmthedetailsandsigntheapplicationstating-

5.03.1.1.1 theapparatusrequiredtobemadesafe;5.03.1.1.2 thenatureoftheworktobecarriedout;5.03.1.1.3 thepointsofisolation;5.03.1.1.4 thenumberandpositionofearthinggearnecessary;and5.03.1.1.5 thetimeanddateonwhichtheworkhastocommence.

5.03.1.2 Aftersigningtheapplication,theappointedoperatorshallmakearrangementswiththesystemcontrollertohavetheapparatusisolated,earthedandbarricaded.


5.03.2 Work permit

5.03.2.1 Theappointedoperatormustissuetheworkpermittotheresponsibleperson,aftertheyhavephysically inspectedandagreed that the requiredapparatus is isolated,earthed,barricaded(ifrequired)andhandedoutaccordingtotheapplication.

5.03.2.2 Theresponsiblepersonmustensurethatallpersonsworkingundertheworkpermitareinformedaboutthesafetyoftheapparatustobeworkedon.

5.03.2.3 Theworker’sdeclarationhastobefilledinandsignedbyallworkersengagedintheworkandtheresponsiblepersonmustkeeptheoriginaldeclarationinsafecustody.

5.03.2.4 Theappointedoperatorandtheresponsiblepersonmust thensignandrecordthedateandtimeoftheworkpermit.

5.03.2.5 Theoriginalworkpermitformmustbedetachedfromthepermitbookandhandedto the responsible person togetherwith anykeys necessary to give access to theapparatusconcerned.

5.03.2.6 Theworkpermitformreferencenumbermustbereportedtothesystemcontroller,uponwhichtheresponsiblepersonisdeemedtohavetakenovertheapparatustobeworkedon.

5.03.3 Worker’s declaration

5.03.3.1 Theresponsiblepersonmustexplain thenatureof theworkcoveredbytheworkpermit to all workers engaged in thework andmust obtain all their names andsignaturesontheworker’sdeclarationform.

5.03.3.2 Theresponsiblepersonmustkeeptheworker’sdeclarationupdatedforthedurationoftheworkpermit.

5.03.3.3 Uponcompletionofthework,allworkersengagedintheworkmustsignoff thedeclaration understanding that the work has been completed and that nobody ispermittedanylongerintheworkplace.

5.03.4 Clearance

5.03.4.1 Oncompletionof anywork forwhichaworkpermitwas issued the responsiblepersonmustensurethatallworkersengagedintheworkarewithdrawnfromtheapparatusorthelivechamberorprohibitedareaconcernedandmustlockalldoorsorgatesgivingaccesstotheapparatus,livechamberorprohibitedarea.

5.03.4.2 Theresponsiblepersonmustthenfillinandsigntheclearancesectionoftheworkpermitforminhisorherpossessionandmustreturnanykeysissuedforthework,togetherwiththeoriginalformoftheworkpermitformtotheappointedoperator.

5.03.4.3 Theappointedoperatormust-

5.03.4.3.1 inspectthecompletedworkandtheremovalofallsurplusmaterialsandtools;and5.03.4.3.2 checkallelectricalclearances;and5.03.4.3.3 ensure that all contractors and workers are withdrawn, before the clearance is

countersigned.


5.03.4.4 Atpowerstations,whenworkiscompletedatmorethanoneplaceinacircuit,eachworkpermitmustbecancelledbytheissueofaclearanceonthecompletionofeachseparate itemof theworkbutnoearthsmayberemovedfromanysectionof theapparatusuntilclearancesarereceivedforallworkpermitswhichwereissuedforworkonthecircuit.

5.03.4.5 Beforethehandbackofthefeederorapparatusforcommissioning,theappointedoperatormustensurethatallwarningnoticeshavebeenremoved.

5.03.4.6 Shouldtheappointedoperatortowhomthefeederorapparatuswashandedoutforworknotbeavailableforanyreason,thesystemcontrollermustliaisewithanotherappointedoperatorastothepresentoperationalstateofthefeederorapparatusandthendecidewhichotheravailableappointedoperatormustbeinstructedtodothehandbackofthefeederorapparatus.

5.03.4.7 IneithercasethesystemcontrollermusttakeallreasonablestepstoensurethatnodeviationfromthisCodewillariseasaresultofsuchtransferofresponsibility.

5.03.4.8.1 If the responsible person towhomaworkpermitwas issued, is not available tocomplete and sign the clearance section on the work permit form and to returntheworkpermit form to the appointedoperator concerned, the systemcontrollermustliaisewiththeofficialinchargeastowhichotherresponsiblepersonmustbeinstructedtosupervisethecompletionofthework,ifnecessary,andtocompleteandsigntheclearancesectionontheworkpermitform.

5.03.4.8.2 Suchother responsiblepersonmustfirst countersign theworkpermit applicationsectiontoindicatethatheorsheisfullyawareoftheworkthatwastobeperformedonthefeederorapparatus.

5.03.5 Return to service

Theappointedoperatormustcompletetheclearancesectionbysigningitandmustnotifythesystemcontrollerthattheclearanceoftheworkpermitofthefeederorapparatusandtheoriginalworker’sdeclarationwasreceivedandthatthefeederorapparatusisreadytobehandedback.

5.03.6 Non-availability of original form

5.03.6.1 Iftheoriginaloftheworkpermitformisnotavailablewhentheclearanceoftheworkpermitisrequired,theappointedoperatormustconfirmthatallworkershavebeen withdrawn from the workplace and the appropriate section of the workersregisterhasbeensigned.

5.03.6.2 Theappointedoperatormustthencountersignthecopyoftheworkpermit,whichsignatureauthorisestheappointedoperatortocleartheworkpermitinquestion.

5.03.7 Non-availability of responsible person

5.03.7.1 Intheeventoftheresponsiblepersontowhomaworkpermithasbeenissuednotbeingavailabletocleartheworkpermit,thesystemcontrollermustliaisewiththeofficialinchargeastowhichotherresponsiblepersonshallcleartheworkpermit.

5.03.7.2.1 Suchotherresponsiblepersonshallfirstcountersigntheworkpermit,orcompletethe“changeofresponsibility”portionontheworkpermitform,toindicatethatheorsheisfullyawareofwhatwastobedoneontheapparatus.


5.03.7.2.2 Suchotherresponsiblepersonshallsupervisethecompletionofthework,fillinandsigntheclearanceontheworkpermitformandreturntheworkpermitformtotheappointedoperatorconcerned.

5.03.7.3 IneithercasethesystemcontrollermusttakeallreasonablestepstoensurethatnodeviationfromthisCodewillariseasaresultofsuchtransferofresponsibility.

5.03.8 Original forms

5.03.8.1 Alloriginalworkpermit formsshallbedestroyedoncompletionof theworkforwhichtheywereissued.

5.03.8.2.1 Eachcompletedworkpermitbookcontainingthecopiesofworkpermitformsshallbereturnedtotheofficialinchargewhenanewbookisputinuse.

5.03.8.2.2 Suchcompletedbookmaybedestroyedoninstructionsfromtheofficialinchargeafter the expiry of the period determined by the licensee, if no query has arisenduringsuchperiodregardinganyentrycontainedinit.

5.03.9 Duration of permit

Apermitshallremaininforceuntilitiscancelledbytheissuingofaclearance.

5.03.10 Application form made out in advance for planned work

5.03.10.1 Permit applicationsmaybefilled in and signed by the responsible employee atanytimenotexceedingthreeworkingdaysandnotlessthenoneworkingdayinadvanceofthedayonwhichtheworkwillcommence.

5.03.10.2 The appointed operator responsible for preparing the apparatus and issuing thenecessaryworkpermitshallsignsuchapplicationwhenthenecessaryoperatingistobedone.

5.03.11 Work may only be done under one permit at a time

Nopersonmayworkundermorethanoneworkpermitatatime.

5.03.12 Issuing of more than one permit

A responsible personmay be issuedwithmore than onework permit at a time:Providedthattheresponsiblepersonisnotdirectlyinvolvedwiththeworkandcanexerciseanadequatelevelofsupervisionateachworkplace.

5.03.13 Work permits are required for each circuit

Whenitisnecessarytoperformworkonapparatusatapowerstationinmorethanonechamberonthesamecircuit,aseparateworkpermitshallbeissuedfortheworkineachseparatecircuit.

5.03.14 Work on apparatus involving licensees, customers and contractors

5.03.14.1.1 Whereitisnecessarytoisolateandearththesupplyapparatusofalicensee,customerorcontractortoenableworkonsuchapparatus,aworkpermitmustbeused.

5.03.14.1.2 Arepresentativeofthelicensee,customerorcontractormustsigntheworkpermitastheresponsibleperson.


5.03.14.2 In the event of apparatus being isolated by a licensee or customer without anestablishedcontrolcentreandtherecouldbeapossiblebackfeedintothesupplysystem,thesystemcontrollerandtheappointedoperatorareresponsibleforrenderingsuchisolatingequipmentinoperative,bylockingoutsuchapparatuswithauniquelockfortheperiodthattheworkisinprogress.

5.03.14.3 If the licensee or customer has an established control centre, the work permitproceduredoesnotapplyandallrequiredoperatingmustbeeffectedbetweenthecontrolcentreandtherelatedcontrolcentreconcerned,butallapparatusonwhichworkhastobeperformedmustbelockedwithauniquelock.

5.03.15 Caseswhereaworkpermitisnotrequired

5.03.15.1 Noworkpermitisrequiredwhenonlyanappointedoperatorcarriesoutworkonafeederorapparatustogetherwiththeworkersworkingunderthedirectsupervisionoftheappointedoperator.

5.03.15.2 Noworkpermitisrequiredwhenanauthorisedpersoniscarryingoutspecificpre-definedworkinaprohibitedarea.

5.03.15.3 Noworkpermitisrequiredwheretestingofequipmentiscarriedoutinaccordancewithparagraph6.03.15ofthisCode.

SECTION 6: AUTHORISED OPERATIONS

6.01 PERSONS AUTHORISED TO PERFORM SWITCHING, LINKING, SAFETY TESTING AND EARTHING OPERATIONS

6.01.1 Onlyappointedoperatorsshallcarryoutswitching,linking,safetytestingorearthingoperations to the extent of their authorisation under instruction of the systemcontroller.

6.01.2 Personsbeingtrainedforoperatingauthorityshalloperateunderthedirectsupervisionofanappointedoperator,ifthesystemcontrollerhasbeendulyinformedofsucharrangement.

6.01.3 Authorisedpersonsinstationsmayrenderauxiliaryservicesonpre-definedauxiliaryapparatus, excluding the switching of auxiliary apparatus on auxiliary circuitsby handor remote control, and the hand out and handback proceduresmust beconfirmedwiththesystemcontrollerandmustbelogged.

6.01.4 Ifanyworkistobeperformedonauxiliaryapparatus,thehandoutandhandbackproceduresmustbefollowedandlogged.

6.01.5 Changingofrelaysettingsonapparatusmustbeconfirmedwiththesystemcontrollerandissubjecttopriorhandoutandhandbackprocedures.

6.02 PROCEDURE FOR WORK IN LIVE CHAMBERS

Nopersonmayenterorbeallowedtoperformanyactivityorworkinalivechamber,unlesstheliveapparatusinthechamberhasbeeneffectivelybarricadedorisolatedandearthed.


6.03 MAKING FEEDERS AND APPARATUS SAFE TO WORK ON

6.03.1 All operating to be carried out under instruction from the system controller

6.03.1.1 Alloperatingonapparatusonapowersystemshallbecarriedoutunderinstructionofthesystemcontroller.

6.03.1.2.1 Beforeanyinstructionsareissued,theauthorisedpersonshalldiscussindetailwiththesystemcontroller,allworktobecarriedout,includingpotentiallydangerous

conditionswhichmayexist.

6.03.1.2.2 Allpartiesshall refer tocorrespondingoperatingdiagramsandshallagree to therelevantoperating.

6.03.2 Emergency switching

6.03.2.1 Inthecaseofanemergency,anypersonmayopenanyswitchorcircuitbreaker,butonlyinsofarasitisnecessarytopreventlossoflifeorinjurytopersonsordamagetoproperty.

6.03.2.2 Fulldetailsofeverysucheventshallbereportedtothesystemcontrollerassoonaspossibleaftertheevent.

6.03.3 Isolating from supply under direct instruction from system controller

6.03.3.1.1 Whereitisnecessarytooperateattwoormorepoints,whicharenotatthesamelocation,theoperatingmaybeperformedbyacorrespondingnumberofappointedoperators, but all the operating detailed in thisCodemust be performed by oneappointedoperatoronlyforeachpoint.

6.03.3.1.2 The system controller shall inform the authorised person that the breakers andisolatorsateachpointcontrollingthefeederhavebeenopened.

6.03.3.2 Wherecontinuousshiftworkingisinoperationatastation,theappointedoperatoror authorised person may hand over the shift to another appointed operator orauthorisedpersononlyifalloperatinginstructionsissuedbythesystemcontrollertosuchappointedoperatororauthorisedpersonhavebeenfullycarriedout.

6.03.3.3.1 Where it is impracticable for one or more appointed operators to obtain directcommunicationwith thesystemcontroller, instructionsmayberelayed throughathirdpersontoanotherappointedoperator.

6.03.3.3.2 Thethirdpersonmustwritedowntheoperatinginstructionsasissuedbythesystemcontroller,andre-readthemwordforwordtotheappointedoperator.

6.03.3.4 Where a breaker of links can be controlled from a remote point overwhich theappointedoperatorhasnocontrol,suchfacilitiesshallbeswitchedofforotherwisemadeinoperativebytheappointedoperatorbeforeisolationiscommenced.

6.03.3.5.1 Noearthingoperationshallbeauthorisedbythesystemcontrolleruntilisolationhas beencompletedatallpointsofsupply.

6.03.3.5.2 Thesystemcontrollershallinformtheappointedoperatorthatthebreakersandlinksateachpointofsupplycontrollingthefeederhavebeenopened.


6.03.3.6 Effectiveisolationmayonlybeachievedby-

6.03.3.6.1 theopeningofanisolatororsuitableswitch;6.03.3.6.2 the racking out of a circuit breaker, inwhich case the opening only of a circuit

breakerorsectionaliser(intank)isnotisolation;6.03.3.6.3 theremovalofdropoutfusesoropeningoflinksonallphases;6.03.3.6.4 thephysicalremovalofsuitableconnectionsonallphases.

6.03.3.7 Exceptinthecaseofanemergency,operatingshallnotbecarriedoutuntilallpersonsnotdirectlyperforming theoperatinghavewithdrawntoa reasonabledistance incaseofafaultwhileswitchingistakingplace.

6.03.4 Links and drop out fuses

6.03.4.1 Linkswhichareaccessibletopersonsnotauthorisedtopossessstationkeysshallbekeptlockedatalltimesexceptwhenbeingoperated.

6.03.4.2 Linksshallonlybeoperatedwithallloadremovedfromthecircuittheycontroland,ifpossible,withthecircuitde-energised.

6.03.4.3.1 Dropoutfusesshallbeoperatedwithdueregardtothelikelyloadcurrentandthepowersystemconditions.

6.03.4.3.2 If theprospective loadcurrent is high, the load shall be removedor the linede-energisedbeforeoperatingthefuses.

6.03.4.4.1 Dropoutfusesshallnotbereclosedafterafaultunlessthelinehasbeende-energisedorthefaulthasbeenpositivelyidentifiedandcorrected.

6.03.4.4.2 Dropoutfusesofsingletransformersmaybereclosedwithallloadfromthelowvoltagesideremoved.

6.03.4.5 Linksanddropoutfusesshallonlybeoperatedwithanapprovedoperatingstickfromoutsidethesafeworkingclearanceunlessthecircuithasbeenisolated,safetytested,earthedandhandedouttotheappointedoperator.

6.03.5 Bypassing of interlocks

6.03.5.1 Except as expressly permitted in this Code, interlocks shall not be bypassed ordefeatedwithouttheexpressauthorityofthepersonincharge.

6.03.5.2 Eachincidenceofbypassinganinterlockshallbespecificallyrecordedinthelogbookkeptbythesystemcontroller,andthelogbookinthestation.

6.03.6 Safety-testing of feeders and apparatus after isolating from supply

6.03.6.1 Immediatelybeforeapplyinganearthatapoint,theappointedoperatorshalluseatestingdeviceprovidedforthepurposetoensurethatthefeederorapparatusisdeadateachsuchpointwhereanearthistobeapplied.

6.03.6.2 The appointed operatormust ensure that the testing device is in properworkingorderandsuitablyratedforthevoltagelevelsbeforeitisused.

6.03.6.3 Inthecaseofcertainapparatuswhichcannotbesafetytestedbeforeearthing,theearthshallbeappliedinamannerapprovedbythelicenseetopreventdanger.


6.03.6.4.1 Wherecableshavebeenisolatedandearthedandworkoneitheroftheendterminalsisnecessary,withouttheseendterminalshavingbeentested,theterminalboxeswillbeopenedandtheterminalstestedwithanapprovedtestingdevice.

6.03.6.4.2 Covered terminals shall be tested before any attempt is made to intrude on thecovering.

6.03.6.5 Whereacablehastobecut, thecableshallbespikedusinganapprovedspikingdevicebeforethecableiscut.

6.03.6.6 Afterafeederorapparatushasbeenearthed,theappointedoperatorshallbesatisfiedthatthefeederorapparatusisdischarged.

6.03.7 Warning notices and earth labels

6.03.7.1 Exhibitionofwarningnoticesinstations

6.03.7.1.1 Before isolatinga feederor apparatus, awarningnotice shallbe affixedoneachcontrolpanelcorrespondingwithsuchapparatus.

6.03.7.1.2 Noisolationofafeederorapparatusshallbedeemedtobecompleteuntilasuitablewarningnoticehasbeenaffixedateachpointfromwhichsuchfeederorapparatuscaninadvertentlybemadealive.

6.03.7.1.3 Thewarningnoticemaynotbedetacheduntilallearthshavebeenremovedandthefeederorapparatusisreadytobemadealive.

6.03.7.1.4 Awarningnoticeonthecontrolpanelshallbethelasttoberemoved.

6.03.7.2 Useofcontrolpanellabels/tagsatpowerstations

6.03.7.2.1.1 When any apparatus at a power station is earthed in preparation forwork on it,or any feeder is earthed forwork external to the station, as soon as the earthingoperationhasbeenreportedtothesystemcontroller,acontrolpanellabel/tagshallbe completed by the appointed operator stating the number and position of theearthinggearandthepermitnumber,ifonehasbeenissued.

6.03.7.2.1.2 Theoriginalcontrolpanellabel/tagshallbedetachedandaffixedtothecontrolpaneloftheapparatussoearthed.

6.03.7.2.2 The appointed operator shall on the instruction of the system controller removethecontrolpanellabel/tagaftertheapparatushasbeenhandedbackandwhentheoperationortheremovaloftheearthinggeartowhichitrelates,hasbeencompleted.

6.03.7.3 Useofwarningnoticesatstations

6.03.7.3.1 Afterapparatushasbeenisolatedandtestedtobedead,earthsmustbeappliedinpreparationtoworkon.

6.03.7.3.2.1 Warning notices must be affixed to the related control panel by the appointedoperator.

6.03.7.3.2.2 Theappointedoperatormustremoveallthewarningnoticesaftertherelatedearthshavebeenremovedasinstructedbythesystemcontroller.


6.03.8 Earthing

6.03.8.1 Allearthingmustbesodesignedtobecapableofwithstandingthefullfaultcurrentflowingthroughitforaspecifiedperiodoftimeinsuchamanneraswillensurean

immediatesafedischargeofelectricalenergyatalltimes.

6.03.8.2 Onlyanapprovedmeansofearthingshallbeused.

6.03.8.3 Minimum earthing requirements

6.03.8.3.1 Stations

6.03.8.3.1.1 Apparatus

WhenapparatusotherthanalineorabusbarhasbeenisolatedfromallpointsofsupplyandtestedinaccordancewiththisCode,itshallbeearthedatleastatallsuchisolatedpointsofsupply.

6.03.8.3.1.2 Busbar

6.03.8.3.1.2.1 Whenabusbarhasbeenisolatedfromallpointsofsupplyandtestedtobedead,itmustbeearthedatleastatonesuchisolatedpointofsupply.

6.03.8.3.1.2.2 Forworkonbusbars,priorarrangementsmustbemadewiththesystemcontrollerfortheapplicationofanadditionalearth.

6.03.8.3.1.2.3 Anadditionalearthmaybeappliedandmovedalongthebusbarasrequiredduringthecourseofworkwithoutfurtherreferencetothesystemcontroller.

6.03.8.3.1.2.4 Shouldanyotherearthberequiredonabusbar,workingearthsmaybeapplied.

6.03.8.3.1.2.5 Forearthingofbusbarsinswitchingstations,priorarrangementsmustbemadewiththesystemcontrollerwhensequencekeysareusedfortheapplicationofabusbarearth.

6.03.8.3.1.3 Transformers

6.03.8.3.1.3.1 Whenatransformerhasbeenisolatedfromallpointsofsupplyandtestedtobedead,eachwindingof the transformermustbe earthed at its isolatedpointsof supply,exceptwhenatransformerwindingcannotbeearthedatitspointofsupplyoratanyotherpartofthecircuitbetweenthewindinganditspointofsupply.

6.03.8.3.1.3.2 Itispermittedtoworkonthecircuitifithasbeenisolatedandtheotherwindings ofthetransformerhavebeenearthedattheirisolatedpointsofsupply.

6.03.8.3.1.3.3 Anauxiliaryortertiarylowvoltagesupplyfromatransformermustbeisolatedatallpointsofsupplyandthebreakersorisolatorslockedintheopenpositionwithaninterlockingkey,safetylock,uniquelockoroperatinglock,wherepossible.

6.03.8.3.1.3.4 Ifitisnotpossibletolockoutbreakersorisolators,awarningnoticemustbeaffixedtotherelevantbreakerorisolatorindicatingthatworkisinprogressonthecircuit.

6.03.8.3.1.4 Metalcladswitchgear

6.03.8.3.1.4.1 Totally enclosed metal clad switch gear shall be earthed only by means of theapprovedearthinggearprovidedaspartoftheswitchgear.


6.03.8.3.1.4.2 Iftheearthinggearisnotavailablethenanyalternativeequipmentmustbeapprovedbeforeuse.

6.03.8.3.1.4.3 Theinsertionofhandsoranyothertoolsintothecontactspoutsforthispurposeisforbidden.

6.03.8.3.2 Lines

6.03.8.3.2.1 Whenalineorsectionofalinehasbeenisolatedfromallpointsofsupplyandtestedtobedead,itshallbeearthedatallsuchpointsofsupply.

6.03.8.3.2.2 Beforeanyworkmaycommence,thelinemustagainbetestedtoprovethatit isdeadwhereaftertheappointedoperatorshallapplysufficientworkingearthsonthelineonallsidesof thepointofwork,whichareclearlyvisiblefromthepointofwork.

6.03.8.3.2.3 Where sectionsof theoverheadguardconductorof a lineare insulated from thetower,andthepossibilityofinductionexists,theoverheadguardconductorshallbeearthed.

6.03.8.3.2.4 Whenastaticvarcompensator(SVC)orcapacitorbankhasbeenisolatedfromallpointsofsupplyandtested,itshallbeearthedatallpointsofsupply.

6.03.8.3.2.5 Adequate earths shall be applied in accordancewith equipment specific earthingprocedure to ensure that all possible trapped charges will be discharged for thedurationofthework.

6.03.8.3.3 Workingearths

6.03.8.3.3.1 Ifworkmustbedoneonexposedconductorsanditisnotobviousfromtheworkplacethattheapparatushasanearthapplied,anadditionalearthwhichisclearlyvisiblefromtheworkplaceshallbeaffixedtotheapparatus.

6.03.8.3.3.2 Iftheconductorsaretobecutorotherwiseseparated,additionalworkingearthsshallbeappliedbeforeseparatingtheconductorssothatoneworkingearthisoneachsideofthebreak.

6.03.8.3.3.3 The person in charge of work may also at his or her discretion arrange for anadditionalearthtobeaffixedtotheapparatus.

6.03.8.3.3.4 Workingearthsshallbeappliedandbondedonallsidesoftheworkplace.

6.03.8.3.4 Portableearthinggear

6.03.8.3.4.1 Testingtobedeadonallthreephases,whereapplicable,asanoperatinginstruction,mustbeperformedbeforeanyearthinggearmaybeapplied.

6.03.8.3.4.2 Whenusingportableearthinggear,itmustfirstbeconnectedtoearthedmetalwork,orasuitableearthspikedriventoaminimumof750mmintothegroundwherenoearthedmetalworkisaccessible.

6.03.8.3.4.3 The other tails of the portable earths shall then be connected to the feeder orapparatustobeearthed,makinguseofanapprovedoperatingsticksuitablyratedfortheoperatingvoltage.


6.03.8.3.4.4 Allsidesoftheapparatusorfeedermustbebondedandearthed.

6.03.8.3.4.5 Theauthorisedpersonshallsecuretheportableearthstothephasesbymeansofanapprovedoperatingsticksuitablyratedfortheoperatingvoltageandcaremust

betakentoensurethatgoodcontactismade.

6.03.8.3.4.6 Portableearthsshallnotbeappliedinanycompartment,cellorswitchbayinwhichthere isanyexposed livemetalpartsatmediumorhighvoltageandwhere thereisachanceofinadvertentlybringingtheearthconnectionwithinthesafeworkingclearanceofthelivemetalparts.

6.03.8.3.4.7 Onremovaloftheearth,theproceduremustbereversedbyfirstremovingthetailsfromthefeederorapparatusandlastlytodisconnectthetailconnectedtotheearthedmetalwork,earthmatorearthspike.

6.03.8.3.5 Earthinglinks/switches

6.03.8.3.5.1 Whenapparatusequippedwithearthing links/switchesare required tobeearthedatmorethanoneplace,theearthinglinks/switchesshallalwaysbeclosedfirstandthereafteranynecessaryearthinggearmaybeaffixedtotheapparatus.

6.03.8.3.5.2 Inremovingearthsforpreparationtomaketheapparatusalive,allworkingearthsmustberemovedfirst, followedbyremovingadditionalearths, ifapplicable,andthentheearthinglinks/switchesmustbeopenedlast.

6.03.9 Work on lines

6.03.9.1 Handing over a line or section of a line for work

6.03.9.1.1 Beforehandingoutalineorsectionofalineforwork,thesystemcontrollershallensure that theauto-reclose featuresonallbreakerscontrolling the supply to thelinehavebeenswitchedoffor rendered inoperativeand thatwarningnoticesaredisplayedonallthebreakercontrolpoints.

6.03.9.1.2 Thelineshallthenbehandedovertotheappointedoperatorbythesystemcontroller,who shall authorise the application of working earths, where required, and oncompletionofthework,theremovalofallsuchworkingearths.

6.03.9.1.3 Immediatelyafteralineorsectionofalinehasbeenhandedovertotheappointedoperator,thesystemcontrollershallaffixthenameofsuchappointedoperatortothelineorsectionofthelineontheoperatingdiagram/mimic.

6.03.9.2 Isolated power lines

6.03.9.2.1 Fullunderstanding

Beforethecommencementofanyworkonapowerline,theresponsiblepersoninchargeofthatworkshallensurethateverypersonwhoistoworkonanypartofthepowerlineisfullyinformedofandunderstandsonwhichcomponentstheworkistobecarriedoutandthatthepersonsignsaworker’sdeclarationformthatheorshesounderstands.

6.03.9.2.2 Towerspolesandhighstructures

6.03.9.2.2.1 Anypersonworkingonanytowerpoleorhighstructureshallmakeproperuseofhis orhersafetybelt.


6.03.9.2.2.2 Nopersonshallworkfromaladderatahighstructureunlessthereisanotherpersonatthesitetoassisthimorher,wherenecessary.

6.03.9.2.2.3 Beforeanypoleisclimbed,eitherdirectlyorfromaladder,itshallbeexaminedforanydeterioration.

6.03.9.2.2.4 If theconditionofapole isdoubtful, it shallnotbeclimbedwithout theexpresspermissionoftheauthorisedpersonincharge.

6.03.9.2.3 Workingearths

6.03.9.2.3.1 Noworkshallbestartedonanypowerlineuntilworkingearthsinadditiontotheregisteredearthshavebeenappliedundertheimmediatepersonalsupervisionoftheauthorisedpersoninchargeoftheworkateachsideoftheworkplacewithinhisorhersight.

6.03.9.2.3.2 Theworkingearthsshallbeissuedbytheauthorisedperson,whoshallberesponsiblefor ensuring that they are all returned tohimorher before thehandback to thesystemcontrollerisgiven.

6.03.9.2.4 Disconnectingpartofapowerline

6.03.9.2.4.1 Before disconnecting part of a power line from the portion being worked on,additionalworkingearthsshallbeappliedasspecifiedinparagraph6.03.9.2.3ofthisCodetoensurethateachofthesectionsofthepowerlinesodisconnectedcomplieswiththeearthingrequirements.

6.03.9.2.4.2 Theworkingearthsshallbeleftconnectedtothepowerlineforaslongasanyoneisworkingoneitherofthetwodisconnectedsections.

6.03.9.2.5 Breakinwork

If theauthorisedpersoninchargeof theworkleavestheworkplacesothatheorshecannotseethepointofworkandlaterreturnstorestartwork,heorsheshallpersonallyverifythatallworkingearthsarestillinplacebeforeworkrecommences.

6.03.9.2.6 Adverseweatherconditions

Intheeventofthenearapproachofalightningstormorifthewindspeedrisestoalevelwheretheauthorisedpersoninchargeoftheworkconsidersittobedangerous,allworkshallbesuspendedandallworkerswithdrawntoground/floorleveluntilconditionsbecomesafeagain.

6.03.9.3 Special conditions for power lines

6.03.9.3.1 Ifnecessarybecauseofdistanceandtimeconstraintsandiftheauthorisedpersoninchargeoftheworkissatisfiedthatthereisnoopportunityformisunderstanding,thefollowingproceduremaybeusedforpowerlinework:

6.03.9.3.1.1 Theauthorisedpersoninchargeoftheshutdownshalltaketheresponsiblepersontothesectionofthelinewhereworkistobecarriedoutandensurethattheresponsiblepersonisfullyawareoftheworktobeperformed;

6.03.9.3.1.2 the authorised person shall give the responsible person a work permit which iscompleteinalldetailsexceptthetime,whichhasbeenomitted;


6.03.9.3.1.3 theresponsiblepersonshallthenwaitfornotificationfromtheauthorisedpersonbyradio.

6.03.9.3.2 The authorised person shall then proceed to the point where supply is to bedisconnectedandinconjunctionwiththesystemcontrollerhavethefeederisolatedandearthedandreceiveahandoutonthefeeder.

6.03.9.3.3 Oncetheauthorisedpersonhashadthefeederhandedouttohimorher,theauthorisedpersonshallinstructtheresponsiblepersontosigntheworkpermit,fillinthetime,applyworkingearthstothepowerlineandproceedwiththeworkrequired.

6.03.9.3.4.1 Oncompletion,theresponsiblepersonshallremoveallworkingearths,signofftheworkpermitandreportbacktotheauthorisedperson.

6.03.9.3.4.2 Theauthorisedpersonshallsignhisorhercopyoftheworkpermittoacknowledgethattheresponsiblepersonhasinformedhimorherofthecompletionofwork.

6.03.9.3.5 Whenalltheworkpermitsissuedforthepowerlinehavebeencleared,theauthorisedpersonshallhandbackthecircuittothesystemcontroller.

6.03.9.3.6.1 All communications for work in terms of this section shall be done over thetelecommunication systemof the licenseeand, ifpossible, themessages shallberecorded.

6.03.9.3.6.2 The completedwork permit shall be returned to the authorised person,who hasissuedit,withinsevendaysfromthedateofissue.

6.03.9.4 Work on a line at more than one place at the same time

6.03.9.4.1 Forworkatseveralremotepointsonaline,whichhasbeenpreparedinaccordancewiththisCode,thelinemaybehandedovertomorethanoneappointedoperator.

6.03.9.4.2 Thesystemcontrollershallaffixontheoperatingdiagram/mimicthenameofeachappointedoperatortowhomthelinehasbeenhandedout.

6.03.9.5 Work in close proximity to live conductors of a line

6.03.9.5.1 Iftheactivity,taskoractionisofsuchanaturethatitcouldinadvertentlyencroachontheminimumsafeworkingclearance,thenthisisinterpretedascloseproximity.

6.03.9.5.2 Iftheminimumsafeworkingclearancebetweenpersons,machineryorobjectsandlive apparatus or lines cannot bemaintained, the live apparatus or lines shall beisolatedandearthedatasafetypanel.

6.03.9.5.3.1 Whereworkistobecarriedoutonthestructureofaline,theresponsiblepersonmaynotworkonsuchstructureunlessheorsheissupervisedbyanappointedoperator,whowill ensure that safeworkingclearanceswith respect to live conductors aremaintainedatalltimes.

6.03.9.5.3.2 Theworkshallonlycommenceafterthesystemcontrollerhashandedoutthelinetotheappointedoperator.

6.03.9.5.4 Nobreakercontrollingthesupplytothelineshallbereclosedafterabreakertripuntilthesystemcontrollerhasconfirmedwiththeappointedoperatortowhomthelinehasbeenhandedoutthatitissafetodoso.


6.03.9.5.5.1 Noworkmaybedoneononecircuitonadoublecircuitstructureiftheothercircuitisalive.

6.03.9.5.5.2 Workmay be done on the line links and the feeder bay in the station, after theequipmenthasbeenearthedusingaspecialtechnique,ascontainedinanoperatingprocedure.

6.03.9.6 Special precautions for lines with live conductors

6.03.9.6.1 Workmay be carried out by an authorised person on a pole or structure whichsupportsconductorsaliveatmediumorhighvoltageiftheauthorisedpersondoesnotgoaboveground/floorlevelandobtainsahandout.

6.03.9.6.2 Ifaworkerisrequiredtoworkonastructuresupportingliveconductors,theworkershall at all times be under the immediate personal supervision of a responsibleperson.

6.03.10 Work on insulated conductors and underground cables

6.03.10.1 Interference with conductors

Nopersonshall interferewith the insulation thatcoversorsupportsanymediumorhighvoltageconductorunlesstheconductorhasfirstbeenisolated,earthedandhandedouttohimorher.

6.03.10.2 Cutting into cables

6.03.10.2.1 Before carryingout anyworkonmediumorhighvoltagecableswhich involvescuttingintoorremovingtheinsulatedcoveringorearthedmetalsheathofthecable,theauthorisedpersoninchargeoftheworkshallensurethatthecableisisolated,earthedatbothendswherepossibleandidentified.

6.03.10.2.2 Inallcaseswherethereisanydoubtastoidentity,thecableshallbespikedwithanapprovedspikinggun.

6.03.11 Workinstationswithexposedliveconductors

6.03.11.1 Live chambers

6.03.11.1.1 Except to theextentnecessary forsafety testingandearthing,nopersonshallbepermitted towork ina livechamberuntilallapparatus in thatchamberhasbeenisolatedandearthed.

6.03.11.1.2 Capacitorsmustdischargeforatleast10minutes.

6.03.11.2 Prohibited areas

6.03.11.2.1 Barriersandclearances

6.03.11.2.1.1 Ifapersonisrequiredtoworkinaprohibitedareawhereahandoutoraworkpermitisrequired,unlessallapparatusinthatenclosurehavebeenmadesafe,thesectionthathasbeenmadesafeandearthedforworktobecarriedoutshallbedefinedasfaraspossiblebytheuseofbarriers,dangertapeorropeswithwarninglabelswheredeemednecessary.


6.03.11.2.1.2 Thebarriers,dangertapeorropesshallbesoarrangedthataworkercannotcomewithin the safeworking clearances of live parts from any position inwhich theworkerispermittedbythebarriers.

6.03.11.2.2 Additionalprecautions

If, in theopinionof the authorisedperson in chargeof thework, the stated safeworkingclearancesarenotsufficienttoavoiddanger,othersuitablemeansshallbetakentoensuretherequireddegreeofsafety.

6.03.11.2.3 Distinguishingmarkers

6.03.11.2.3.1 The section that has beenmade safe forwork, shall be distinguished by havingreflagsplacedon thenon-workingsideof thebarriers,danger tapeor ropesatadistanceof0,5mto1,0mfromthebarriers,dangertapeorropesandseparatedbynotmorethan6m.

6.03.11.2.3.2 Theworkingareamayalsobebarricadedwithsafetynets.

6.03.11.2.3.3 Ifworkistotakeplaceatnightandthelightingconditionsaresuchthattheredflagscannotbeadequatelydistinguished,theflagsshallbereplacedorsupplementedbyredlights.

6.03.12 Use of ladders and long objects

6.03.12.1 Permission to use

6.03.12.1.1 Ladders and other long objects may not be used without the permission of theauthorisedpersoninchargeofthework.

6.03.12.1.2 Nometalladdersmaybeusedinhighvoltageyards.

6.03.12.2 Type and size

Laddersforuseinaprohibitedareashallbeofanapprovedtypeandmaynotbeofanexcessivelengthfortheworkinvolved.

6.03.12.3 Movement and erection

6.03.12.3.1 Themovementanderectionofladdersandlongobjectsshallbecarriedoutundertheimmediatepersonalsupervisionofaresponsibleperson.

6.03.12.3.2 Whenbeingmovedatground/floorlevel,theyshallbecarriedinahorizontalpositionandnotabovewaistheight.

6.03.13 Metal clad switch gear

6.03.13.1 Busbar spouts

Whenworkistobecarriedoutonbusbarspouts,thefollowingoperationsshallbecarriedoutinstrictsequence:

6.03.13.1.1 Thesectionofthebusbarstobeworkedonshallbemadesafe;6.03.13.1.2 allshuttersoflivespoutsshallbelockedsothattheycannotbeopened.If,because

ofthedesignoftheswitchgear,itisnotpossibletolocktheshutters,theauthorisedpersonshalltakespecialprecautionstomarkanyspoutsthathavenotbeenmadesafeforwork;


6.03.13.1.3 thebusbarsshallbetestedbymeansofanapprovedvoltageindicatortoverifythattheyaredead.Thevoltageindicatoritselfshallbetestedbeforeandafteruse;

6.03.13.1.4 theisolatedsectionofthebusbarsshallbeearthedbymeansofapprovedearthinggearataswitchgearpanelotherthantheoneatwhichworkistobedone;

6.03.13.1.5 theinsertionofthehandoranytoolapartfromtheapprovedearthinggearintothecontactspoutsforthispurposeisexpresslyforbidden;

6.03.13.1.6 warningnoticesshallbeattachedatallpointswherethebusbarscanbemadealive;6.03.13.1.7 aworkpermitorhandoutshallbeissued;6.03.13.1.8 workingearthsshallbeplacedinthecontactspoutsonallphasesofthebusbarsat

thepointofwork;6.03.13.1.9 theworkingearthsmayberemovedonephaseatatimewhennecessaryfortesting

butshallbereplacedassoonaspossibleandinanycasebeforetheworkingearthonasecondphaseisremoved,unlessitisessentialforthetesttohavemorethanoneworkingearthremoved.

6.03.13.2 Feeder and voltage transformer spouts

Whenworkistobecarriedoutonfeederorvoltagetransformerspouts,thefollowingoperationsshallbecarriedoutinstrictsequence:

6.03.13.2.1 Thefeedershallbemadesafe;6.03.13.2.2 theshuttersofalllivespoutsonthecircuitshallbelockedsothattheycannotbe

opened;6.03.13.2.3 if,becauseofthedesignoftheswitchgear,itisnotpossibletolocktheshutters,the

authorisedpersonshall takespecialprecautions tomarkanyspouts thathavenotbeenmadesafeforwork;

6.03.13.2.4 thecircuitshallbetestedbymeansofanapprovedvoltageindicatortoverifythatitisnotlive;

6.03.13.2.5 thevoltageindicatoritselfshallbetestedbeforeandafteruse;6.03.13.2.6 the circuit shall be earthed bymeans of approved earthing gear at all points of

isolationfromthesupply;6.03.13.2.7 theinsertionofthehandoranyothertoolapartfromtheapprovedearthinggearinto

thecontactspoutsforthispurposeisexpresslyforbidden;6.03.13.2.8 warningnoticesshallbeattachedatallpointswherethecircuitcanbemadealive;6.03.13.2.9 aworkpermitorhandoutshallbeissued;6.03.13.2.10 theearthsmayberemovedwhenessentialfortestingpurposesbutshallbereplaced

assoonaspossible.

6.03.13.3 Removal of covers

Nopersonmayremovethecoversofanychambercontaininglivepartsuntilthosepartshavebeenisolated,safetytestedandearthedand,wherenecessary,ahandoutorworkpermitissued.

6.03.14 Work on transformers

6.03.14.1 Isolation

6.03.14.1.1 When work is to be carried out on or in the proximity of the conductors of atransformer, theisolatorsforallwindingsshallbeopened,evenwhenthereisnoalternativesourceofsupplytoawinding.

6.03.14.1.2 Whenthereisavoltageorauxiliarytransformerassociatedwiththetransformer,itshallbeisolatedorthelowvoltagefuseswithdrawntopreventthepossibilityofthetransformerbeingmadealivethroughthevoltageorauxiliarytransformer.


6.03.14.2 Common neutral earthing equipment

6.03.14.2.1 Where the transformer is connected toneutral earthing equipment,which is alsousedbyothertransformers,theisolatinglinkbetweenthetransformerandtheneutralequipmentshallbeopenedbeforethetransformerismadeavailableforwork.

6.03.14.2.2 Thedisconnectionofsolidlyearthedneutralsorneutralequipmentconnectedsolelytothetransformeronwhichworkistobecarriedout,isnotrequired.

6.03.14.3 Neutral bushing

Whereworkistobecarriedoutonthetankofatransformerwithanexposedneutralbushing, which is not solidly connected to earth, the transformer must be fullyisolatedandearthed.

6.03.14.4 Tap changers

6.03.14.4.1 Before work is carried out on tap changer mechanisms, which may operateautomaticallyorbyremotecontrol,allsecondaryvoltagesuppliestothetapchangershallbeisolated.

6.03.14.4.2 Thisrequirementdoesnotexcludetestsandadjustmentsonthemechanismwherethesecondarysuppliesmustbeconnectedforthetestsifallpersonsworkingontheequipmentareawareofthesituation.

6.03.15 Testing of medium and high voltage equipment

6.03.15.1 Person in charge

6.03.15.1.1 Whenanyhighvoltageapparatusistobesubjectedtoatestvoltagebeforebeingconnected to thepowersystem, the test shallbecarriedoutunder the immediatepersonalsupervisionofanauthorisedperson.

6.03.15.1.2 The authorised person shall ensure that such apparatus is adequately guarded topreventdangerandthatwarningnoticesareattachedinconspicuousplacesforthedurationofthetest.

6.03.15.2 Discharging of equipment

6.03.15.2.1 Allapparatusshallbedischargedbeforeandaftertheapplicationofthetestvoltage.

6.03.15.2.2 Earthsshallbereconnectedtoallpointssoconnectedbeforethetest.

6.03.15.3 Test conductors

Temporaryconductorsusedfor testingpurposesshallbeadequately ratedfor thepurposeandshallbeeasilyvisible.

6.03.15.4 Test connections

6.03.15.4.1 Testconnectionsshallnotbeappliedinacompartmentwherethereareanyexposedlivemetalpartsatmediumorhighvoltageunlessthesafeworkingclearancesaremaintainedbetweentheapparatustobetestedandthelivemetalparts.

6.03.15.4.2 Thisrequirementdoesnotexcludetheuseofapprovedvoltageindicatorsorapproveddevicesforphasingoutcircuits.


6.03.16 Work on low voltage systems

6.03.16.1 Step down medium to low voltage stations and pole mounted transformers

6.03.16.1.1 Awork permit shall be issued to a responsible person or contractor before anyoperatingisundertakenonthelowvoltageapparatusinanystepdownstationoronanypolemountedtransformer.

6.03.16.1.2 Theworkpermitshallincludethedetailsoftheworktobeundertakenonthelowvoltagesystemandtheappropriateproceduresspecifiedinsection5ofthisCodeshallbefollowedwiththeissuingandclearanceoftheworkpermit.

6.03.16.2 Low voltage power lines

6.03.16.2.1.1 Nopersonshallbeallowedtoworkonlivelowvoltagepowerlineswithexposedconductors.

6.03.16.2.1.2 The lines shall be isolated and a work permit issued as specified in paragraph6.03.16.1ofthisCode.

6.03.16.2.2.1 Apersonwhohasbeentrainedandauthorisedtomakeliveconnectionsoninsulatedaerialbundleconductorpower lines,maymakeconnectionsonsuchpower lineswithoutaworkpermitbeingissuedifsuchworkiscarriedoutusingapprovedtoolsandinsulatedpiercingconnectors.

6.03.16.2.2.2 Nootherworkmaybecarriedoutonaerialbundleconductorpowerlineswithoutaworkpermitbeingissuedandthefeederbeingisolated.

6.03.16.3 Low voltage distribution kiosks

6.03.16.3.1.1 Nopersonshallbeallowedtoundertakeworkinalowvoltagedistributionkioskwithoutthesupplytothekioskeitherbeingisolatedatthepointofsupplyorlocallyinthekioskiffacilitieshavebeenprovidedinthekioskforthatpurpose.

6.03.16.3.1.2 Liveworkmaybeundertakenifsuitablyratedsafetyglovesareused.

6.03.16.3.1.3 Aworkpermitshallbeissuedandtheappropriateproceduresspecifiedinsection5ofthisCodeshallbefollowedpriortothecommencementofthework.

6.03.16.3.2.1 Meterreadersshallbeallowedaccesstometeringkioskstoreadtheconsumermetersifsuchmetersareinstalledinacompartmentwherenolivebusbars,conductorsorterminalsareexposedorcanbereached.

6.03.16.3.2.2 Thekiosksshallhaveseparate,differentlocksforthemeteringcompartmentandforthelivecompartment.

6.03.16.3.3.1 Apersontrainedandauthorisedtodoso,shallbeallowedtodisconnectanyconsumerfromthesupplyfornonpaymentbyswitchingofftheconsumercircuitbreaker.

6.03.16.3.3.2 The person shall not be authorised to isolate the supply by disconnecting liveconductors.

6.03.16.3.3.3 Circuitbreakerswhichhavebeenswitchedoff,forwhateverreason,shallbetaggedtoindicatethatthecircuithasbeenswitchedoffandthatthecircuithasnottripped.


6.04 RETURNING FEEDERS AND APPARATUS TO SERVICE

6.04.1 Under normal conditions

6.04.1.1 Beforereturninganyfeederorapparatustoserviceafterworkcarriedoutthereonhas been completed, the appointed operator shall personally be satisfied that allpersonshavebeenwithdrawnfromthefeederorapparatusandfromallchambersandenclosurescontainingsuchapparatusandthatanypermanentbarrierhavebeenre-installed.

6.04.1.2 Theappointedoperatorshalladvise thesystemcontroller that theworkhasbeencompletedand,whereapplicable, thatallworkingearthshavebeenremovedandthatheorsheishandingbackthefeederorapparatus.

6.04.1.3 Thesystemcontrollershallremovefromthefeederorapparatusontheoperatingdiagram/mimicthenameoftheappointedoperatorandshallissueinstructionsfortheremovalofallotherearths.

6.04.1.4 Wherealinehasbeenhandedtomorethanoneappointedoperator,noearthsmayberemovedfromthelineuntilallappointedoperatorsinvolvedhavereportedtothesystemcontrollerthecompletionoftheirworkandtheremovalofallworkingearthsfromtheirportionoftheline.

6.04.1.5 At power stations,whenwork is done atmore than one place in a circuit, eachwork permit shall be cancelled by the issue of a clearanceon the completionofeachseparateitemoftheworkbutnoearthsmayberemovedfromanyportionoftheapparatusuntilclearanceshavebeenreceivedforallworkpermitswhichwereissuedforworkonthecircuit.

6.04.1.6 Beforefinallyreturningthefeederorapparatustoservice, theappointedoperatormustensurethatallaffixedwarningnoticeshavebeenremoved.

6.04.2 When the responsible person or appointed operator is not available

6.04.2.1 Iftheresponsiblepersontowhomaworkpermithasbeenissuedisnotavailabletofill in and sign the clearanceon theworkpermit formand to return theworkpermitformtotheappointedoperatorconcerned,theofficialinchargeshallinstructanotherresponsiblepersontosupervisethecompletionofthework(ifnecessary)andtofillinandsigntheclearanceontheworkpermitform;inwhichcasetheotherresponsiblepersonshallfirstcountersigntheworkpermitapplicationtoindicatethat

heorsheisfullyawareofwhatwastobedoneontheapparatus.

6.04.2.2 Wheneveritisnecessarytoreturnafeederorapparatustoserviceandtheappointedoperatortowhomthefeederorapparatushasbeenhandedoutforworkisnotavailableforanyreason,thesystemcontrollershallconsultwiththeofficialincharge,whoshallinstructanotherappointedoperatortoreturnthefeederorapparatustoservice.

6.04.2.3 Ineithercasethesystemcontrollershalltakeallreasonablestepstoensurethatnodangerarisesfromsuchtransferofresponsibility.

6.05 EXEMPTION FROM GENERAL PROCEDURE

6.05.1 Work to be done on a line controlled from a single source of supply

Whenworkhastobedonebyanappointedoperatoronalineonthedistributionsystemwhichiscontrolledfromasinglesourceofsupply,theappointedoperator


may,subjecttoparagraph2.03.5ofthisCode,makecompletepriorarrangementswith the system controller and may receive pre-authorised instructions to open,isolateandearththelineandsubsequentlyreturnittoservicewiththeexceptionthatitwillnotbenecessarytoadvisethesystemcontrollerthatworkhasbeencompletedbeforethelineismadealive.

6.05.2 Replacing of drop out fuse links without reference to the system controller

6.05.2.1.1 Anappointedoperatormaywithoutreferencetothesystemcontrollerreplaceoneortwodropoutfuselinksupto33kVonathree-phasecircuit,whenfoundblown,butmustreplaceallthreephasedropoutfuselinkfuses,andmaythereafterclosethedropoutfuselinksonceonly.

6.05.2.1.2 The appointed operatormay not replace the drop out fuses if all three fuses areblownunlesstheconsentofthesystemcontrollerhasbeenobtained.

6.05.2.2.1 Anappointedoperatormaywithoutreferencetothesystemcontrollerreplaceonefuseonadropoutfuselinkupto33kVonadualphasecircuit,whenfoundblown,butmust replaceboth fuse linkfuses,andmay thereafterclose thedropout fuselinksonceonly.

6.05.2.2.2 Theappointedoperatormaynotreplacethedropoutfusesifbothfusesareblownunlesstheconsentofthesystemcontrollerhasbeenobtained.

6.05.2.3 Anappointedoperatormaynotreplacethefuseofadropoutfuselinkonasingle-linecircuit,asonSWER(singlewireearthreturn)reticulations,whenfoundblown,butmustfirstreportthesituationtothesystemcontrollerforfurtherinstructions.

6.05.2.4.1 Anappointedoperatormaynotreplaceblownfusesondropoutfuselinksoncircuitsof44kVorhigher,unlessinstructedbythesystemcontrollertodoso,inwhichcaseonlytheblownfuseorfusesmaybereplacedonsealedtypefuses.

6.05.2.4.2 Intheeventofasinglefusebeingblowninaholderwithareplaceablefuseelement,allthreefusesmustbereplaced.

6.05.2.5 Thesystemcontrollershallbenotifiedassoonaspossibleafterthefusehasbeenreplacedandclosed.

6.05.3 Piggyback systems

Whenworkhastobedonebyanauthorisedpersononapiggybacksystem,alllineson thepiggyback systemshall beopen, isolated and earthedandhandedover inaccordancewiththisCodebeforeanyworkmaycommenceonanyofthelines.

6.05.4 Station isolation

6.05.4.1 Wheretotalstationisolationisrequested,thestationshallbeisolatedandearthedatallpointsofsupply.

6.05.4.2.1 Thestationshallbehandedovertooneauthorisedperson,withpermissiontoapplyandremoveworkingearthsasrequired.

6.05.4.2.2 Thenumberofworkingearthsthatwereappliedandremovedshallbedeclaredathandback.


6.06 SUPERVISION OF WORK

Responsiblepersons,contractorsorworkersshallberesponsiblefortheexecutionofallworkcarriedoutonapparatusandfeedersincompliancewiththisCode.

6.07 TEMPORARY ABSENCE OF PERSONS IN CHARGE OF WORK

6.07.1.1 Intheeventofanauthorisedpersoninchargeofanyworkbeingunabletobepresentfor thedurationof theworkinprogress, theauthorisedpersonshall, inallcases,beforedeparting,delegatetoanotherauthorisedpersontotakechargeduringhisorherabsence.

6.07.1.2 The system controllermust be informed prior to the departure of the change ofresponsibilities.

6.07.2 Shouldanotherauthorisedpersonnotbeavailable,allworkersshallbewithdrawnfromtheworkduringthetemporaryabsenceoftheauthorisedpersonincharge.

6.08 TESTING APPARATUS

6.08.1.1 Whereitisnecessaryforteststobecarriedoutonapparatusbyaresponsiblepersonor apersonauthorised todo so, the systemcontroller shall issue instructions fortheapparatustobeisolatedandearthedinaccordancewiththisCode,afterwhichthe system controller shall permit the appointed operator to remove the earth, ifnecessary,forsuchtests.

6.08.1.2 Where the appointed operator is not also the responsible person, the appointedoperator may only remove such earth under the supervision of the responsibleperson.

6.08.2.1 Itshallbetheresponsibilityofthepersoncarryingouttheteststowarnand,wherenecessary,totemporarilywithdrawtheworkersfromtheapparatusforthedurationofthetests.

6.08.2.2 Upon completion of the tests, the appointed operator shall replace the earth andinform the system controller that the apparatus has been restored to the originalcondition.

6.08.3.1 Ifitisnecessaryforthepurposeofcarryingoutteststoenergisetheapparatusfromthepowersystemwhilesuchapparatusisinanabnormalcondition,theresponsiblepersonandtheappointedoperatormustmakespecialarrangementswiththeofficialinchargesothattheoperatingproceduresmaybeagreeduponbeforehand.

6.08.3.2 TheagreedoperatingproceduresmustbecarriedoutinaccordancewiththisCode.

6.08.3.3 Forthepurposesofparagraph6.08.3.1ofthisCode,anabnormalconditionisoneinwhichtheapparatusisnotinaconditiontotakenormalloadduetojumpersbeingbrokenortemporaryconnectionshavingbeenmade,orforsomesimilarreason.

6.09 NO OPERATING WHILE WORK IS IN PROGRESS IN LIVE CHAMBER

Shouldanyoperatingotherthanemergencyswitchingbenecessaryatanystationonapparatusinalivechamberinwhichinspectionormaintenanceworkisinprogress,allworkers shall bewithdrawn from the chamber until such operating has beencompleted.


SECTION 7: ABNORMAL CONDITIONS

7.01 ABNORMAL CONDITIONS TO BE REPORTED TO SYSTEM CONTROLLER

The system controller must be advised as soon as possible of any failure orinterruptionofsupplytoanypartofapowersystem,oranyabnormalconditionsincludingsignsofapproachingadverseweatherconditions.

7.02 EMERGENCY SWITCHING

7.02.1 When emergency switching has been carried out, all intended work shall besuspendedand immediateattention shallbegiven to thecauseof theemergencyswitchingoperation.

7.02.2.1 Soleattentionmustbegiventoinjuriessustainedbyanyperson.

7.02.2.2 Promptandeffectivefirstaidmustbeadministeredbyacompetentpersonandthepatientmustbeevacuatedanddeliveredforprofessionalmedicaltreatment.

7.02.3.1 Thecausemustbeevaluatedandreportedtothesystemcontroller.

7.02.3.2 Thesystemcontrollermustreportthemattertoallrelevantpersonsinvolvedwithincidents.

7.02.3.3 Thereafterthesystemcontrollermayproceedtoattendtotherepairorreplacementofapparatus,ifnecessary.

7.02.4 Continuityofsupplymustthenberestored.

7.03 COMMUNICATION SYSTEM

7.03.1 Anymessagetoandfromthesystemcontrollershallbegivenpreferenceatalltimesinaccordancewithparagraph2.06ofthisCode.

7.03.2 During periods of abnormal conditions, the system controller may interrupt, orinstructanypersontodeferorinterrupt,callsormessagesotherthanthoserelatingtothecontrolofapowersystem.

7.04 RESTORATION OF SUPPLY IN THE ABSENCE OF COMMUNICATION

7.04.1.1 Incaseswherecommunicationwiththesystemcontrollercannotbeestablished,anappointedoperatororauthorisedpersonmay,athisorherdiscretion,closebreakersinordertoresumesupply:Providedthatwheretwoormorefeedersenterastation,only the breakers of feeders originating from one point may be closed withoutpermissionofthesystemcontroller.

7.04.1.2 Thediscretionof theappointedoperatororauthorisedpersonmustbe ledby theflagsalarmsandthestabilityofthepowersystem.

7.04.2.1 Theclosingofabreakertoresumesupplyshallbereportedtothesystemcontrollerassoonaspossiblethereafter.

7.04.2.2 Theoperatinginstructionformmustbedulycompleted.


7.05 ESTABLISHMENT OF LOCAL CONTROL CENTRE

7.05.1 Ifnecessary,anauthorisedpersonmay,subject toparagraph7.05.2of thisCode,establishalocalcontrolcentreandtakeoverthedutiesofthesystemcontrollerinrespectoftheareaaffected.

7.05.2 Alocalcontrolcentreshallnotbeestablisheduntileitherthesystemcontrollerhasgiven permission, or every possible effort has beenmade to contact the systemcontrollerbuthasfailedandallappointedoperators,whoareoperatingintheareaaffected,havebeenadvisedoftheestablishmentofthelocalcontrolcentre.

7.05.3 All operating must be logged during this period, and when communication ornormalconditionsarerestored,thesystemcontrollermustbegivenfulldetailsoftheoperatingaswellasthepositionsofallbreakers,linksandearthinggearatthetimeofhandingbacktothesystemcontroller.

7.05.4 The authorised person in charge of the local control centre shall be responsiblefortheoperationofthesectionofthepowersystemlocatedintheareaaffectedinaccordancewiththisCode,butmaynotpersonallycarryoutanyoperating.

SECTION 8: LIVE WORK

8.01 DEFINITIONS

8.01.1 Officials and persons

Inthissection,unlessthecontextotherwiseindicates-

8.01.1.1 deputy team leader means a person specifically authorised to take over theresponsibilitiesoftheteamleaderinrespectofliveworkinprogressforpurposesofcompletingaspecifictaskonly;

8.01.1.2 live workermeansaworkerauthorisedtocarryoutlivework;

8.01.1.3 team leadermeanstheauthorisedpersoninchargeoflivework.

8.01.2 Operating terms


8.01.2.1 chassismeansacommercialvehicleortrailer(frame)onwhichtheinsulatingaerialdeviceismountedtoperformlivework;

8.01.2.2 electrical distance means the electrical distance in air, which protects againstelectricalbreakdown,namelytheminimumdistancebetweentwoelectrodesrequiredtoensurethattheprobabilityofelectricalbreakdownisnegligiblewhensubjectedtothemostsevereelectricalstresslikelytoariseundertheconditionsstipulatedinthisCode,whichmayrefertophase-to-phaseorphase-to-earthdistancesandalsotoelectricaldistance,ergonomicdistanceandsafeworkingdistance;

8.01.2.3 ergonomic distancemeansthedistancethatallowsforinadvertentbodymovementandjudgmentofdistancesduringtheworkrequiredtobecarriedoutattheminimumsafeworkingdistancewhenperforminglivework,andincludeselectricaldistanceandsafeworkingdistance;


8.01.2.4 insulate means covered, enclosed, surrounded or supporting live conductors orapparatus with insulating material of such thickness and properties that it willprevent theflowof electricityorpotentialbetween theobject so coveredand itssurroundingsoranyexternalobject incontactwith it includingthepreventionofmakingcontactwithearth;

8.01.2.5 insulating aerial device means an aerial device comprising an insulating boomdesigned to position the liveworker and the equipment for liveworking,whichdeviceismountedinafixedpositionoronatrailerormoregenerallyonavehiclechassis;

8.01.2.6 insulating boommeans that portion of an aerial device used for livework thatinsulatestheliveworkers’platformfromearthandfromwhichaliveworkermayworksafelyonliveapparatus;

8.01.2.7 live partmeansanyconductivepartofapparatus,whichisaliveandinnormaluse,andincludestheneutralconductor;

8.01.2.8 live workmeansmaintenance,repair,buildingandconstructionworkcarriedoutonliveandoperationalapparatususingapprovedtechniquesandequipmentasspecifiedinthissection,andliveworkinghasasimilarmeaning;

8.01.2.9 platformmeanstheliveworker-carryingcomponentofanaerialdevice,suchasabucket;

8.01.2.10 safe working clearance means the minimum distance that must be maintainedbetween any parts of the body of a live worker, or the conductive tool directlyhandled,andlivepartsatdifferentpotentials,whichminimumdistanceisthesumoftheelectricaldistanceandergonomicdistance;

8.01.3 Forms, books, notices, documents and other printed media


8.01.3.1 live work declaration form means a printed form containing declaration andclearancesectionsfortheauthorisationofallliveworktobedoneonlive,operationalapparatusintermsofthisCode;

8.01.3.2 live work warning noticemeansanyportablewarningnoticeprovidedtoindicatethat livework is in progress on apparatus and to indicate any special operatingconditioninforceonanypanelorcircuitwhileliveworkisinprogress.

8.02 ABNORMAL CONDITIONS TO BE REPORTED TO SYSTEM CONTROLLER

8.02.1 Persons in charge of live work

Onlypersonswhohavebeenspecificallyauthorised tobe inchargeof liveworkshall takeover live apparatus for liveworking and issue a liveworkdeclarationform.

8.02.2 Persons who may perform live work

8.02.2.1 Subject toparagraph8.02.2.2of thisCode, liveworkmayonlybeperformedbypersonswhohavebeenspecificallyauthorisedtodoso.


8.02.2.2 Unauthorised personsmay be permitted to perform live work while undergoingtrainingifsuchpersonsareundersupervisionofaninstructor,whohasbeen

authorisedtoperformlivework.

8.02.3 Persons who may deputise for the team leader

Onlyadeputyteamleadermaytakeovertheresponsibilitiesoftheteamleaderforpurposesofcompletingthespecifictask.

8.03 LIVE WORK AT POWER STATIONS OR ON THE DISTRIBUTION SYSTEM

8.03.1 Circumstances requiring a live work declaration form

Aliveworkdeclarationformshallberequiredforallliveworkonlivehighvoltageapparatus at any power station or at any place on the transmission system ordistributionsystem.

8.03.2 Forms in duplicate

8.03.2.1 Aliveworkdeclarationformshallbemadeoutinduplicate.

8.03.2.2 Theoriginalshallberetainedbytheauthorisedpersoninchargeoftheliveworkandthecopyshallbeleftintheliveworkdeclarationbook.

8.03.3 Preparation and handing over of apparatus for live work

8.03.3.1 Whenliveworkistobecarriedoutonanyhighvoltageapparatus,theauthorisedpersoninchargeoftheliveworkshallnotifythesystemcontrollerofthefollowing:

8.03.3.1.1 Theapparatustobeworkedon;8.03.3.1.2 thenatureoftheworktobecarriedout;8.03.3.1.3 thetimethattheworkistocommenceandtheestimateddurationofthework.

8.03.3.2 The authorised person in charge of the livework shall arrangewith the systemcontrollerforliveworkwarningnoticestobeaffixedtoallcontrolpanelsofbreakerscontrollingthesupplytotheapparatusconcernedandforallauto-reclosingfeaturesonsuchbreakerstobeswitchedofforotherwisemadeinoperative.

8.03.3.3.1 Wheretheauto-reclosefunctionofalineismadeinoperativeviasupervisoryremotecontrol,itisnotnecessarytoapplyaliveworkwarningnoticetothecontrolpanel.

8.03.3.3.2 Iftheauto-recloseismadeinoperativemanually,theliveworkwarningnoticeshallbeapplied.

8.03.3.3.3 AllSCADAcontrolstotheaffectedcircuitshallbemadeinoperative.

8.03.3.4 Whenliveworkwarningnoticeshavebeenaffixedtoallcontrolpanelsofbreakerscontrollingthesupplytotheapparatusconcernedandallauto-reclosingfeaturesonthesebreakershavebeenswitchedofformade inoperative, thesystemcontrollershallsoinformtheauthorisedpersoninchargeoftheliveworkandshallhandovertheapparatustotheteamleader.

8.03.3.5.1 Forliveworkonlinesof33kVandbelow,itmaynotbenecessaryforauto-reclosefeaturestobeswitchedofforotherwisemadeoperative.


8.03.3.5.2 Thismust be recorded by the system controller and all SCADA controls to theaffectedcircuitshallbemadeinoperative.

8.03.3.5.3 Itwillnotbenecessarytoapplytheliveworkwarningnoticeifallworkisdonein strict accordance with the approved high voltage live working standards andprocedures.

8.03.4 Issue of a live work declaration form

8.03.4.1.1 Theteamleadertowhomthesystemcontrollerhashandedoverapparatusforlivework, shall explain to all the personswhowill be engaged in the livework thearrangementsmadewiththesystemcontroller.

8.03.4.1.2 The authorised person in charge of the livework shall identify the apparatus tobeworkedon, the operational voltageof the apparatus to beworkedon and thecorrespondingsafeworkingclearancetobemaintained.

8.03.4.2 Thepersonstobeengagedintheliveworkshallacknowledgetheirunderstandingofthesedetailsandrestrictionsbysigningtheliveworkdeclarationformbeforetheyproceedwiththelivework.

8.03.5 Cancellation of a live work declaration form

8.03.5.1.1 When live work has been completed, or is suspended for any reason, and theapparatusistobereturnedtonormalservice,theauthorisedpersoninchargeoftheliveworkshallwithdrawallpersonsfromtheliveapparatus.

8.03.5.1.2 Theauthorisedpersoninchargeoftheliveworkshallremovealltoolsandequipmenttoasafepositioninrelationtotheliveapparatus.

8.03.5.2 Theauthorisedpersoninchargeoftheliveworkshalladvisethepersonsengagedintheliveworkthattheapparatusistobehandedbacktothesystemcontrollerandthatnofurtherworkmaybeperformed.

8.03.5.3 Theauthorisedpersoninchargeoftheliveworkshallnotifythesystemcontrollerthattheliveworkiscompleteorotherwiseoftheexactstateoftheapparatusandwhethertoolsor

equipmenthavebeenleftontheapparatus.

8.03.5.4 Theauthorisedpersoninchargeoftheliveworkshallcompleteandsigntheclearancesectionontheoriginalandduplicateliveworkdeclarationform.

8.03.6 Original and duplicate forms

Originalliveworkdeclarationformsandcompletedbooksshallberetainedfortheperioddeterminedbythelicensee.

8.03.7 Restrictions on re-closing breakers

8.03.7.1 Whenthesystemcontrollerhashandedoveranyapparatusforlivework,thenameof the team leader shallbeaffixed to theoperatingdiagram/mimic in thecontrolcentre.

8.03.7.2 Nooperatingotherthantheemergencyopeningofbreakersshallbeperformedonthebreakerscontrollingsupplytotheapparatusuntiltheauthorisedpersoninchargeoftheliveworkhashandedbacktheapparatustothesystemcontroller.


8.03.7.3 From the time that theapparatus ishandedover to the time that theapparatus ishandedbacktothesystemcontroller,nobreakerwhichcontrolsthesupplytotheapparatusandwhichhastrippedforwhateverreason,shallberecloseduntilsuchtimeastheauthorisedpersoninchargeoftheliveworkhascontactedthesystemcontrollerandhasstatedthatitissafeforthebreakertobereclosed.

8.03.8 Duration of live work declaration

Itistheresponsibilityoftheteamleadertodecidewhenconditionsaresuchthatliveworkcanno longerproceedsafely,whereuponthe liveworkdeclarationshallbecancelledinaccordancewithparagraph8.03.5ofthisCode.

8.03.9 When the team leader is not available

8.03.9.1 Iftheauthorisedpersontowhomapparatushasbeenhandedoutisforanyreasonnotavailable,anotherpersonauthorisedintermsofparagraph8.02.1or8.02.2ofthisCodemaytakeovertheresponsibilitiesoftheauthorisedpersoninchargeofthelivework.

8.03.9.2 This person shall countersign the original of the live work declaration form toindicate thatheorshe is fullyawareofwhatmustbedoneon theapparatusandinformthesystemcontrollerthatheorshehastakenovertheapparatus.

8.03.9.3 Thesystemcontrollershallremovethenameoftheoriginalauthorisedpersonfromtheoperatingdiagram/mimicinthecontrolcentreandshallrecordthenameoftheauthorisedpersontheninchargeofthelivework.

804 SUPERVISION OF LIVE WORK

8.04.1 Theteamleadershallberesponsibleforthesafeexecutionoflivework.

8.04.2.1 Theteamleadershallatalltimesobservetheworkinprogresstoensurethatitiscarriedoutinasafemanner.

8.04.2.2 When the team leader needs to withdraw from the workplace, another personauthorisedintermsofparagraph8.02.2of thisCodeshall takechargeof theliveworkandshallobservetheliveworkinprogresstoensurethatitiscarriedoutinasafemanner.

8.04.3 Wheretheteamleadercannotobservepartofthework,theobservationofthatpartoftheworkshallbedelegatedtoanotherpersonauthorisedintermsofparagraph8.02.2ofthisCode.

SECTION 9: DESIGN AND CONSTRUCTION

9.01 GENERAL

Thissectioncoversthesafetyaspectsandstandardstobetakenintoaccountinthedesignandconstructionofpowerlines.

9.02 NORMATIVE STANDARDS

Thefollowingstandardsshouldbetakenintoaccountinthedesignandconstructionofpowerlines:


9.02.1 SABS standards:

9.02.1.1 SANS088:Pilefoundations.9.02.1.2 SANS0100-1:Thestructuraluseofconcrete-Part1:Design.9.02.1.3 SANS0100-2:Thestructuraluseofconcrete-Part2:Materialsandexecutionof

work.9.02.1.4 SANS 0120-3-HC:Code of practice for usewith standardized specifications for

civilengineeringconstructionandcontractdocuments-Part3:Guidancefordesign-SectionHC:Corrosionprotectionofstructuralsteelwork.

9.02.1.5 SANS0121:Cathodicprotectionofburiedandsubmergedstructures.9.02.1.6 SANS0162-1:Thestructuraluseofsteel-Part1:Limit-statesdesignofhot-rolled

steelwork9.02.1.7 SANS0162-2:Thestructuraluseofsteel-Part2:Limit-statesdesignofcold-formed

steelwork.9.02.1.8 SANS0163-1:Thestructuraluseoftimber-Part1:Limit-statesdesign.9.02.1.9 SANS0199:Thedesignandinstallationofanearthelectrode.9.02.1.10 SANS 1200-F: Standardized specification for civil engineering construction -

SectionF:Piling.9.02.1.11 SANS 1200-G: Standardized specification for civil engineering construction -

SectionG:Concrete(structural).9.02.1.12 SANS 1200-HC: Standardized specification for civil engineering construction -

SectionHC:Corrosionprotectionofstructuralsteelwork.9.02.1.13 SANSIEC60383-1:Insulatorsforoverheadlineswithanominalvoltageabove1

000V-Part1:CeramicorglassinsulatorunitsforACsystems-Definitions,testmethodsandacceptancecriteria.

9.02.1.14 SANS IEC 60815: Guide for the selection of insulators in respect of pollutedconditions.

9.02.1.15 SANS10280-OverheadpowerlinesforconditionsprevailinginSouthAfrica.

9.02.2 IEC standards:

9.02.2.1 IEC60071-1:Insulationco-ordination-Part1:Definitions,principlesandrules.9.02.2.2 IEC60071-2:Insulationco-ordination-Part2:Applicationguide.9.02.2.3 IEC60826:Loadingandstrengthofoverheadtransmissionlines.

9.02.3 NRS standards:

9.02.3.1 NRS000:RationalizeduserdefinitionsforuseintheElectricitySupplyIndustry.9.02.3.2 NRS001:CostofSupplymethodology.9.02.3.3 NRS002:Graphicalsymbolsforelectricaldiagrams.9.02.3.4 NRS034:ElectricityDistribution-Guidelinesfortheapplicationdesign,planning

andconstructionofmediumvoltageoverheadpowerlinesuptoandincluding22kV,usingwoodenpolestructuresandbareconductors.

9.02.3.5 NRS 034: Guidelines for the provision of electrical distribution networks inresidentialareas.

9.02.3.6 NRS040:Highvoltageoperatingregulations.9.02.3.7 NRS 043: Code of practice for the joint use of structures for power and

telecommunicationlines.9.02.3.8 NRS044:Workingproceduresandstandardsinrespectoftheinstallationofnew

electricalworksandtelecommunicationfacilities,ortheextensionormodificationofsuchexistingworksandfacilities.

9.02.3.9 NRS047:Qualityofservice.9.02.3.10 NRS048:Qualityofsupply.9.02.3.11 NRS057:Codeofpracticeforelectricitymetering.9.02.3.12 NRS060:Codeofpracticeforclearancesforelectricalsystemswithratedvoltages

uptoandincluding145kV,forsafetyreasons.


9.02.3.13 NRS064:GuidelinefortheexchangeofspatialinformationintheElectricitySupplyIndustry.

9.02.3.14 NRS069:Codeofpracticefortherecoveryofcapitalcostsfordistributionnetworkassets.

9.02.3.15 NRS 076: Earthing of distribution substations with nominal voltages up to andincluding132kV.

9.02.3.16 NRS 080: Quantifying and reporting of energy losses in electricity distributionnetworks.

9.02.3.17 NRS082:Recommendedmaintenancepolicyforelectricitynetworks.9.02.3.18 NRS089-1:Maintenanceofelectricitynetworks-Part1:Powercables.9.02.3.19 NRS089-2-1:Maintenanceofelectricitynetworks-Part2:Overheaddistribution

systems,Section1:Overheadlines.9.02.3.20 NRS089-2-2:Maintenanceofelectricitynetworks-Part2:Overheaddistribution

systems,Section2:Inspectionandsupplementaloftreatedwoodutilitypoles.9.02.3.21 NRS089-2-3:Maintenanceofelectricitynetworks-Part3:Overheaddistribution

systems,Section3:Themanualreplacementofarottenwoodenpolestructure.9.02.3.22 NRS089-2-4:Maintenanceofelectricitynetworks-Part4:Overheaddistribution

systems,Section4:Clearingandmaintenanceofservituderoutes.9.02.3.23 NRS089-2-5:Insulators.9.02.3.24 NRS 089 - 3.1:Maintenance of electricity networks - Part 3: Power substation,

Section1:General.9.02.3.25 NRS089-3.2:Maintenanceofelectricitynetworks-Part3:Powersubstation,Section

2:Powertransformers,Circuitbreakers,isolatorsandinstrumenttransformers.9.02.3.26 NRS 089 - 3.3:Maintenance of electricity networks - Part 3: Power substation,

Section3:Miniaturesubstations,distributiontransformersandelectricalenclosures.9.02.3.27 NRS089-4:Maintenanceofelectricitynetworks-Part4:Controltechnologies.9.02.3.28 NRS 089 - 5 - 2:Maintenance of electricity networks - Part 5: Street and area

lighting,Section2:Streetlighting.9.02.3.29 NRS 089 - 5 - 3:Maintenance of electricity networks - Part 5: Street and area

lighting,Section3:Highmast.

9.03 EQUIPMENT AND MATERIAL

Material and equipment to be used on power lines shall comply with the latestapplicablestandardspecifications.

9.04 CLEARANCES OF POWER LINES

9.04.1 Minimum clearances to other services

Theminimumclearancesofelectricconductorsandotherwiresofpowerlinestootherservicesshallnotbelessthantheclearancesindicatedinthefollowingtable,Table 1:


Table1: Minimumclearancestootherservices

MINIMUM CLEARANCE IN METERSHighest system RMS voltage

phase-to-phase kV

System nominal

RMS voltage

kV

Above ground outside

townships

Above ground in townships

Above roads in townships, proclaimed

roads outside townships

and railways

To communi-cation lines, other

power lines or between power

lines

To structures not forming

part of power lines

1,1orless - 4,9 5,5 6,1 0,6 3,07,2 6.6 5,0 5,5 6,2 0,7 3,012 11 5,1 5,5 6,3 0,8 3,024 22 5,2 5,5 6,4 0,9 3,036 33 5,3 5,5 6,5 1,0 3,048 44 5,4 5,5 6,6 1,1 3,072 66 5,7 5,7 6,9 1,4 3,2100 88 5,9 5,9 7,1 1,6 3,4145 132 6,3 6,3 7,5 2,0 3,8245 220 6,7 6,7 7,9 2,4 4,2300 275 7,2 7,2 8,4 2,9 4,7362 330 7,8 7,8 9,0 3,5 5,3436 400 8,1 8,1 9,3 3,8 5,6800 765 10,4 10,4 11,6 6,1 8,5533kVDC 8,6 8,6 4,3 4,3 6,1

Provided that thesefigure arebasedon the assumption that clearances shall bedetermined for aminimumconductor temperatureof 50Cand a swing angle corresponding to awindpressureof500Pa: Provided further thatwhere under normal conditions power line conductors operate at atemperatureabove50CC,theclearanceatthehighertemperatureatwhichtheconductorsoperateshallbeinaccordancewiththeclearanceindicatedinTable 1.

ForthepurposesofTable 1:

(a) Minimumclearanceaboveground inandoutside townshipsmeans theminimumdistancebetweenlivepartsofapparatusandearth;

(b) minimumclearanceaboveroadsandrailways,inandoutsidetownshipsmeanstheminimumdistancebetweenlivepartsofapparatusandsuchroadsandrailways;

(c) minimum clearance between power lines and communication lines means theminimumdistancebetweenliveconductorsandsuchlines;

(d) minimumclearancetostructuresnotpartofpowerlinesmeanstheminimumdistancebetweenliveconductorsandsuchstructures.

9.04.2 STANDARD MINIMUM ELECTRICAL CLEARANCES/DISTANCES

The standard minimum electrical clearances/distances shall not be less than theclearances/distancesindicatedinthefollowingtable,Table 2:


Table 2: Standard minimum electrical clearances/distances

System nominal voltage

kV

Highest system voltage

kV

Minimum electrical clearance/distance

in mm

Minimum safe working clearance/

distance

in mm

Minimum live work safe working clearance/distance

in mmRMS Peak Phase-to-

earthPhase-to-phase

Vertical Horizontal Phase-to-earth

Phase-to-phase

1 1.5 15 20 20 20 - -3.3 3.6 80 110 2500 1200 500 9506.6 7.2 150 200 2600 1200 600 110011 12 200 300 2700 1300 700 110022 24 320 400 2800 1400 800 110033 36 430 500 2900 1500 800 110044 48 540 610 3000 1600 800 110066 72 770 890 3200 1800 900 130088 100 1000 1140 3300 1900 1000 1500132 145 1450 1680 3700 2300 1200 1900220 245 1850 2700 4300 2900 1700 2800275 300 2100 3600 4800 3400 2000 3400330 362 2500 4300 5400 4000 2300 4100400 436 2900 4800 5700 4300 2800 4800765 800 3200 8900 8500 7100 5500 9700

533kVD.C. 3700 n/a 6200 5900 4250 -

ForthepurposesofTable2:

(a) Minimumelectricalclearancemeanstheminimumdistanceincleandryair,betweendifferentlivepartsofapparatusorlivepartsandearthrequiredtoensurethatthepossibilityofelectricalbreakdownisnegligible;

(b) minimum safe working clearance means the minimum distance, vertically orhorizontally, that must be maintained between any body part of a person, or aconductivetooldirectlyhandled,andlivepartsofapparatusatdifferentpotential;

(c) minimumliveworkworkingclearancemeanstheminimumdistancebetweenphase-to-earthandphase-to-phase.

9.04.3 MINIMUM SAFETY CLEARANCES

Theminimumsafetyclearancesshallnotbelessthantheclearancesindicatedinthefollowingtable,Table 3:


Table 3: Minimum safety clearances

Highest system RMS voltage

System nominal

RMS voltage

Safety clearance phase-to-

earth

Safety clearance phase-to-

phase

Minimum live line working clearances

m

Tower-top clearances

mkV kV m m Phase-to-

earthPhase-to-

phaseStill air

conditionsNormal swing

Maximum swing

1.1orless - - - - - - - -7,2 6.6 0.15 0.2 - - - - -12 11 0.2 0.3 - - - - -24 22 0.32 0.4 - - - - -36 33 0.43 0.5 - - - - -48 44 0.54 0.61 0.8 1.1 0.54 0.5 0.1572 66 0.77 0.89 0.9 1.3 0.77 0.71 0.2100 88 1.00 1.14 1.0 1.5 1.00 0.92 0.24145 132 1.45 1.68 1.2 1.9 1.45 1.3 0.35245 220 2.1 2.7 1.7 2.8 2.1 1.88 0.6300 275 2.5 3.6 2.0 3.4 2.5 2.2 0.7362 330 2.9 4.3 2.3 4.1 2.9 2.6 0.86436 400 3.2 4.8 2.8 4.8 3.2 2.9 1.0800 765 5.5 8.9 5.5 9.7 5.5 5.2 1.9533kVDC 3.7 -

9.04.3 Clearances between parallel independent structures

9.04.3.1 Theseparationbetweenanoverheadcommunicationlineandapowerlineortwopowerlineserectedparalleltoeachotheralongthesameroute,shallbesuchthattheclearancebetweenanyconductorofthehighervoltagelineandanyconductororearthwireofthelowervoltagelineisneverlessthantheminimumphase-to-phaseclearanceapplicabletothehighervoltageline.

9.04.3.2.1 Theseparationbetweenparallellinesshallbesuchthat,shouldeitherlineoverturn,itwillnottouchanypartoftheadjacentline.

9.04.3.2.2 Ifthisseparationcannotbeprovided,thesupportsofthelinethatcouldtouchtheotherlineshallbedesignedtowithstandthebroken-wirecondition.

9.044 Clearances between circuits on common structures

9.04.4.1 Thehighervoltagelineshallbeabovethelowervoltagelineorcommunicationlinewherelinesareerectedoneabovetheotheroncommonstructures.

9.04.4.2 Thevertical separationbetween thenearest conductorsof any two lines shall bein accordancewith thephase-to-phase clearancesgiven inTable I for thehighervoltageline.

9.04.5 Clearances between conductors of lines with a vertical configuration

Attentiontoensurecompliancewiththephase-to-phasevoltageclearanceswherea higher-mounted conductor could operate at full load andmaximum sagwith alowermountedconductoratambienttemperature.


9.04.6 Aerial bundle conductors

An aerial bundled conductor may be considered to be an insulated cable fordeterminingclearances.

9.04.7 Induced voltages

The distance between the power line and any other system (such as atelecommunication, railwayorpipeline)shallbesuch that inducedvoltagesshallnotexceed:

9.04.7.1 ARMSvoltageof50Vinsteadyoperationalstate;9.04.7.2 aRMSvoltageof430Vonpowerlineswhereanearthfaultisclearedinmorethan

0,5s;9.04.7.3 aRMSvoltageof1000Vonpowerlineswhereanearthfaultisclearedin0,35sto

0,5s:or9.04.7.4 aRMSvoltageof1200Vonpowerlineswhereanearthfaultisclearedinlessthan

0,35s.

9.04.8 Electrolytic corrosion

9.04.8.1.1 WhereariskexistsofelectrolyticcorrosionofundergroundservicesintheproximityofapowerlineduetostraycurrentsfromDCservicesenteringtheearthingsystemofapowerlineerectedclosetotheDCservice,suitableprotectivemeasuresshallbetakentoreducetheriskofelectrolyticcorrosion.

9.04.8.1.2 This will usually take the form of separating the earthing system from the DCsystemandprovidinginterposinginsulatingmaterial.

9.04.8.2 Corrosion protectionmeasures shall complywith Imust be developedwith duerecognitionofSANS1200-HC,SANS0120-3-HGandSANS0121.

9.05 CONDUCTORS AND EARTH WIRES FOR POWER LINES

9.05.1 Corrosion

Allconductorsandearthwiresshallbeofmaterials thathaveadequatecorrosionresistancetotheatmospheretowhichtheyarelikelytobeexposedinservice,orshallbesuitablyprotectedagainstcorrosion.

9.05.2 Minimum size

9.05.2.1 Theminimumsizeoftheconductorortheconductorbundleshallbedeterminedbythefollowingkeyfactors:

9.05.2.1.1 Thethermalratingthatisrequired;and9.05.2.1.2 theshort-circuitcurrent.

9.05.2.2 Thesizeofthephasesingleconductororofthephasebundleshallbeselectedtolimitvoltagedrop,audiblenoise,radiointerference,televisioninterferenceandlossduetocorona.

9.05.3 Current-carrying capacity

9.05.3.1 The following are the three main operational states for which current-carryingcapacitycalculationscanbedone:


9.05.3.1.1 Longduration/normaloperation:itispreferabletolimittheconductortemperaturetobetween50°Cand60°C;

9.05.3.1.2 emergencyoperation:whereitisexpectedthatnormalcurrent-carryingcapacitywillbeexceeded;

9.05.3.1.3 short-duration emergency operation: where temperatures exceeding 80°C areassumed,thethermalbehaviourshallbeassumednottochange.

9.05.3.2 Inthecaseofcopperconductors,thenormaloperatingtemperaturelimitsshouldnotbeexceeded.

9.05.4 Maximum tensions

9.05.4.1 Themaximumtensioninconductorsandearthwiresatatemperatureof-5°Candawindpressureof700Paonashapefactorof0,6oftheprojectedareashouldnotexceed40%ofthebreakingstrengthoftheconductorsorearthwires.

9.05.4.2 Ifthereisapossibilityofconductorvibrationwhichcouldleadtothefailureoftheconductordue to fatigue, the risk shouldbe reducedbyusinga lower conductortensionthanthemaximumpermitted.

9.05.4.3 Thetensionlimitsforconductorsandsteelearthwiresareasfollows:

9.05.4.3.1 Copperconductors:Thetensionatatemperatureof15°Cshouldnotexceed26%oftheultimatetensilestrengthoftheconductor;

9.05.4.3.2 ACSRandAAACconductors:Ifvibrationdampersarenotusedandthelineshaverelativelyshortspans,typicallyunder200m,theinitialtensionatatemperatureof-5°Cshouldnotexceed25%oftheultimatetensilestrengthoftheconductor.Whenvibrationdampersareused,thefollowinglimitationsarerecommended:

9.05.4.3.2.1 Theinitialtensionat-5°Cshouldnotexceed33,3%oftheultimatetensilestrengthoftheconductor;

9.05.4.3.2.2 theinitialtensionat15°Cshouldnotexceed25%oftheultimatetensilestrengthoftheconductor;and

9.05.4.3.2.3 thefinaltensionat15°Cshouldnotexceed20%oftheultimatetensilestrengthoftheconductor;

9.05.4.3.3 earthwires:Inthecaseofgalvanizedsteelearthwiresofminimumbreakingstrengthintherange700MPato1100MPa,themaximumtensionat15°Cshouldbesuchthatthestressintheearthwiredoesnotexceed180MPa.Thiscriterion p e rm i t stheuseoftensions(at15°C)ofthefollowingpercentagesofminimum

breakingstrength:9.05.4.3.3.1 700MPawires:25%;and9.05.4.3.3.2 1100MPawires:15%.

9.05.5 Sag charts

Saginformationandthecorrectiontableforincreasedtimebetweenstringingandregulating should be obtained from themanufacturer of the chosen conductor inordertoproducesagcharts.

9.05.6 Creep

Initial(orstringing)chartsandfinalchartsinwhichamaximumallowanceismadeforcreepshouldbepreparedbeforestringingcommences.


9.05.7 Joints

9.05.7.1.1 All joints shall be such that their current-carrying capacity exceeds that of theconductorsthatarebeingjoined.

9.05.7.1.2 Tensionjointsshallhaveabreakingstrengthofatleast95%ofthatoftheconductor.

9.05.7.2 Inareasthatareconducivetocorrosion,itisgoodpracticetocoatthejoinedendsandfillthefittingswithchemicallyinertcorrosion-inhibitingpaste.

9.06 POWER LINE STRUCTURES

9.06.1 Factors of safety

Theminimumfactorsofsafetytobeappliedforthetypeofstructureandloadareindicatedinthefollowingtable,Table 4:

Table 4: Minimum factors of safety

Type of structure

Factor of safetyBased on

type-tested structure

Based on ultimate breaking strength

Based on modulus of

rupture

Steellatticestructuresandcross-arms 2.5 2.5Solid-drawnsteelpoles 2.0 2.5Welded steel poles and steel poles with swaged ortelescopicjoints

2.2 2.5

Stay-wireassemblies2.52.5Reinforcedconcretespunpoles 2.4 3.5Mechanically vibrated reinforced concrete structuresandcomponents

2.5 3.5

Other types of reinforced concrete structures andcomponents

2.75 3.75

Woodenmembersnotcontinuouslyloaded 3.5 4.4 2.7WoodenmemberssubjectedtocontinuousLoading 5.5 6.75 4.5

Inthecaseofsteellatticestructuresandsteelcomponentssuchasbuilt-upcross-armsandbracingmembers, the factor of safety shall be 2,5 on tested failing load or,when calculated, on tensilestrengthoftensionmembersandoncripplingstrengthofcompressionmembers.

9.06.2 Design Loading

Thetotalloadonasupportconsistsofthefollowingloads,whichshouldbetakenintoconsiderationwiththedesignofthesupport:

9.06.2.1 Windloadsonconductorsandearthwires;9.06.2.2 windloadsonsupports;9.06.2.3 windloadsoninsulatorsandfittings;9.06.2.4 verticalloadsduetoconductors;9.06.2.5 verticalloadsduetosupports,insulatorsandfittings;9.06.2.6 normalloadsduetoconductortensions;9.06.2.7 loadsduetodifferentialtension;9.06.2.8 horizontalloadsduetostaywires.


9.06.3 Loading due to broken conductors

With a line that has a single conductor per phase, the assumptions given in thefollowingtable,Table 5,inrespectoftheloadsimposedonthestructuresthatsupportthespaninwhichthebreakoccurs,expressedaspercentagesofthemaximumdesignloadatatemperatureof-5°Candwhensubjectedtoawindpressureof700Pa,canbeusedforthedesignloadingofastructure.

Table 5: Loads imposed on structures owing to conductor breakage

Type of structureLoad imposed on structure, as a percentage of

maximum design loadConductor attachment point Earth wire attachment point

Strain 100 100Suspension 70 100

9.06.4 Erection loads

Whenadesigndoesallowfortheconductorsandearthwirestobestrungononesideonlyofastrainstructure,thedesignshouldallowforthefollowingconditions:

9.06.4.1 Theconductortensionduringerectionwouldnormallybethatatabout15°Cinstillairandthestrainstructureshouldbecapableofwithstandingtheloadduetothistension,withafactorofsafetyof1,5;

9.06.4.2 when the structure is strungonone sideonly, the structure shouldbecapableofwithstandingtheloadduetoconductortension,atatemperatureof-5°Candwhensubjectedtoawindpressureof700Pa,withanominalfactorofsafetyof,say,1,2duringerectionconditions;

9.06.4.3 allstructuresshouldfurthermorebecapableofwithstanding,withafactorofsafetyof1,5,thenormalverticalloadsplusanadditionalmassof150kgto300kgtoallowfor theweight of theworkers and their equipment at each conductor attachmentpointduringconstructionandtheverticalcomponentofloadsduetobackstayingshouldalsobeconsidered.

9.07 FOUNDATIONS FOR POWER LINE

9.07.1 Structureserectedonconcretefoundationsinthecaseoflatticesteelstructuresordirectlyinthegroundinthecaseofwooden,concreteorsteelpolesshallbesosetinthegroundthattheyarecapableofwithstanding,withoutappreciablemovementinthegroundandwithanadequatefactorofsafety,theforcesimposedbytheloadingonthestructureundernormalorbrokenconductororerectionconditions.

9.07.2.1 Asafebearingpressureofabout200kPacanbeassumedforcheckingresistancetodownwardorlateralforcesinthecaseofordinarysoilandattheaveragefoundationdepths.

9.07.2.2 Thevaluecouldbethreeorfourtimesthisvalueinhardrockysoiland,perhaps,onethirdofthisvalueinsandyorboggyground.

9.07.2.3 Inthecaseofwoodenpoles,foundationfailurebeforepolefailureisdesired,andavalueof345kPacanbeassumed.

9.07.3 Thesafebearingpressureofthesoilinwhichafoundationorastructureistobeinstalled,shouldbedeterminedbysitetests.


9.07.4 Forcheckingresistancetoupwardforces,itiscommonlyassumedthatthedensityofordinarysoilisabout1600kg/M3andtheangletotheverticalofthesidesofthefrustumofearth-resistingupliftmaybetakenas25°ingoodsoilsto0°inpoorsoils.

9.07.5 Inthecaseofpoles,anincreasedbearingareainthelateraldirectionisoftenobtainedbytheadditionofkickingblocksatthebottomandatapointbelowground/floorlevelthatisequaltoone-thirdoftheburieddepthofthepole,whileanincreasedbearingareaatthebottomisobtainedbytheadditionofbaseplates.

9.08 INSULATORS AND FITTINGS

9.08.1 Mechanical strength requirements

9.08.1.1 Themechanicalstrengthofinsulatorsandfittingsusedinstrainstructuresshouldbesuchthattheyareatleastasstrongastheminimumbreakingstrengthofthephaseorearthconductortowhichtheyareattached.

9.08.1.2 Thestrengthofsuspensionassembliesshouldbesuchthatafactorofsafetyofatleast1,5isprovidedundertheloadingimposedunderbrokenconductorconditions.

9.08.2 Electrical insulation levels and footing resistance requirements

9.08.2.1 Thebasicinsulationlevelrequiredforapowerlineofagivenvoltagedependsonmany factors, suchas theanticipatedmagnitudeofvoltagescausedbyswitchingsurgesorfaults,thealtitudeoftheline,thepossibilityofcontaminationofinsulatorsandthedesireddegreeofimmunityfromlightning.

9.08.2.2 Minimum insulation levels are given in the following table, Table 6, but it isemphasized that the insulation of each line should be designed for its specificconditions.ThelistofinsulationlevelsisinaccordancewithIEC60071-1andIEC60071-2.

Table 6: Minimum insulation levels for power lines

Highest system RMS

voltage kV

System nominal

RMS voltage kV

System fault level

kA

Rated peak lightning impulse

withstand voltage kV

Rated peak switching impulse

withstand voltage (phase-to-earth voltage)

kV

Phase-to-phase voltage ratio to

the phase-to-earth voltage

peak value


withstand voltage (phase-to-phase voltage)

kV

60 s RMS power

frequency peak

switching withstand

voltage (phase-to-earth

voltage) kV12 11 - 75 - - - 2824 22 - 125 - - - 5036 33 - 170 - - - 7048 44 20 250 - - - 9572 66 20 350 - - - 140100 88 25 380 - - - 150145 132 40 550 - - - 230245 220 40 850 - - - 360300 275 50 1050 850 1.5 1300 -362 330 50 1300 950 1.5 1425 -


Highest system RMS

voltage kV

System nominal

RMS voltage kV

System fault level

kA

Rated peak lightning impulse

withstand voltage kV


withstand voltage (phase-to-earth voltage)

kV

Phase-to-phase voltage ratio to

the phase-to-earth voltage

peak value


withstand voltage (phase-to-phase voltage)

kV

60 s RMS power

frequency peak

switching withstand

voltage (phase-to-earth

voltage) kV420 400 50 1425 1050 1.5 1550 -800 765 50 2100 1550 1.5 2400 -

NOTE: Thedesignedlineinsulationlevelswilldeterminelineequipmentclearances.Theminimumsafetyphase-to-earthclearancesshownincolumn3ofTable3shouldnotbeinterpretedasspecifyinglineequipmentclearances.Intherangeofratedvoltagethatiswithinthescopeofthisstandard,therearethreerangeswithdistinctiveinsulationcriteriaandthereforeinsulationlevels.Theyaregiveninsubparagraphs(a),(b)and(c)below:

(a) Range A, for line voltages less than 44 kV:Themaincriterionisonlythelightningimpulseovervoltages,whichcanbeseverewhentheloadisdisconnectedonthelowvoltagewindingofatransformerconnectedtoatransmissionline.Thisimpulsevoltageisusuallyreducedbytheuseofsurgearresters.

(b) Range B, for 44 kV to 220 kV lines:Themaincriteriaaretheratedlightningimpulsevoltage and the rated 60 s power frequency voltage, which cover all internalovervoltages.Theassumedfootingresistancesare-

(i) 132kV:20Ωand (ii) 220kV:30Ω.(c) Range C, for 275 kV to 400 kV lines:Themaincriterionistheswitchingovervoltage

(representinginternalovervoltage),includingtheratedlightningimpulseovervoltage,basedonfootingresistancesof-

(i) 275kV:30Ω;and (ii) 400kV:40Ω.

9.08.3 Insulation levels in polluted areas

The criteria for insulation coordination in conditions of pollution are based onSANSIEC60815andonthecorrespondingproposedcreepagedistancesgiveninthefollowingtable,Table 7.

Table 7: Creepage distance over external insulation


kV

System nominal RMS

voltage kV

Creepage distance over external insulation for line, in accordance with SABS IEC 60815

Lightly polluted areas

Medium polluted areas

Heavily polluted areas

Very heavily polluted areas

1211 192 240 300 3722422 384 480 600 7443633 576 720 900 11164844 770 960 1200 15007266 1150 1400 1800 220010088 1600 2000 2500 3100145132 2320 2900 3600 4500



kV

System nominal RMS

voltage kV

Creepage distance over external insulation for line, in accordance with SABS IEC 60815

Lightly polluted areas

Medium polluted areas

Heavily polluted areas

Very heavily polluted areas

245220 3920 4900 6100 7600300275 4800 6000 7500 9000362330 5800 7200 9000 11000420400 6700 8400 10500 13000800765 12800 16000 20000 25000

9.09 STAY WIRES

9.09.1 Installation of stays

9.09.1.1 A stay shouldbe attached to the structure at thepoint of applicationof the loadwhichitisdesignedtocounteractandshouldbeinstalledinadirectionoppositetothatofsuchload.

9.09.1.2 Thelocationshouldbesuchthattheclearancefromthestaywiretoanylivepartofthelineunderalldesignconditionsisnotlessthantheappropriatephase-to-earthclearancegiveninTable 3.

9.09.1.3.1 Staywiresshouldnotpassunder,overornearcommunicationlinesortheassociatedpoles.

9.09.1.3.2 Where this is unavoidable, stays should be installed in such away thatworkersworkingonthepolesorwiresofthecommunicationlinecannotcomecloserthantheappropriatephase-to-earthclearancetoanyportionofthestaythatcouldbecomealiveunderfaultconditions.

9.09.1.4.1 Astayinsulatororaninsulatedrodshallbeinstalledinthestaywheretheinstallationofastaywillaffectthebasicinsulationlevelofastructure.

9.09.1.4.2 Thestayinsulatororinsulatedrodshallbeinstalledsuchthatintheadventofthestaytouchinganylivepartofalineinstalledbelowtheattachmentpointofthestaythatthelowerportionofthestaywillnotbemadealive.

9.09.2 Factor of safety

9.09.2.1 Thestrengthofanystaywireused,shouldbesuchthatitsultimatetensilestrengthisatleast2,5timesthemaximumtensioncalculatedasindicatedinparagraph9.05.4abovefornormalconditions.

9.09.2.2 Ifstaywiresareusedtowithstandloadingduetoabrokenconductorortoerectionconditions,thefactorofsafetymaybereduced,buttheultimatestrengthshouldbeatleast1,5timesthemaximumtensileforcefortheappropriatecondition.

9.09.2.3.1 Higherfactorsofsafetyshouldbeusedforstayrodsthanforstaywires,especiallywherethreadedportionsareintension.

9.09.2.3.2 Afactorofsafetyof2,5shouldbeusedforstayrodsandoneofatleast3fortheirthreadedportions.


9.10 EARTHING

9.10.1 Support structures for power lines

9.10.1.1 Allmetalpowerlinestructuresandanymetalworkonwoodenorconcretestructures,whichcouldinadvertentlybecomealiveandwhicharewithin2.4moftheground,shallbeearthed.

9.10.1.2.1 Theeffectivenessoftheearthingofastructureshallbedeterminedbymeasuringitsresistancetoearth.

9.10.1.2.2 Ifthisresistanceissohighthatthestructureisnotearthed,asupplementaryearthingsystemshouldbeprovidedinaccordancewith/withduerecognitiontoSANS10199.

9.10.1.3 A footing resistanceof less than10U is recommended for terminal structuresatstationsandafootingresistanceoflessthan20Uisrecommendedforthesecond,thirdandfourthstructuresfromastation.

9.10.1.4 Whereitisnotpracticabletoprovideasufficientlylowearthresistancetoensurethattherewillbenodangertolifeintheeventofafaultinastructure,theriskcanbereducedbytheuseoffastandreliableprotection.

9.10.2 Fittings

Power linefittings,whicharemore than2.4maboveground,donothave tobeearthed.

9.10.3 Earth wires

9.10.3.1 Toreducethenumberofoutagescausedbylightning,earthwiresshouldbelocatedabove thephaseconductors in suchaposition that thecoverangle is reasonablysmall.

9.10.3.2 Coveranglesintherange30°to45°arerecommendedforsingleearthwiresystems.

9.10.3.3 Coveranglesof30°orlessfortheouterconductorsanda60°coverangletotheconductorsbetweentheearthwiresisrecommendedfortwoearthwires.

9.10.3.4 Whereearthwiresareonlyusedtoprovideareturnpathforearthfaultcurrents,theyshouldpreferablybelocatedbelowthelineconductorssothatifaconductorbreaks,thereisapossibilitythatitwillmakecontactwiththeearthwire.

9.10.3.5 Earthwires installedas lightningprotectionshouldbeconnected toearthateachpowerlinesupport,eitherthroughthesupportinthecaseofmetalsupports,orbyanearthingconductorinthecaseofsupportsofnon-conductingmaterials.

9.10.3.6 Lightningprotectiononwoodenpolesoflinesoperatingatvoltagesbelow33kV,canbeimprovedbyomittingearthwiresandleavingtheinsulatorassembliesunearthed,keepingtheinsulationlevelashighaspossible.

9.10.3.7 Earthwire insulatorsfittedwithasparkgapset to6mmshallbe installed in thefollowingcircumstances:

9.10.3.7.1 Atterminalstructuresnotconnectedtothemainstationearthmat;9.10.3.7.2 attractionstationterminalstructures;


9.10.3.7.3 onthesecond,third,fourthandfifthstructuresfromthestationifanyorallofthesestructureshavefootingresistancesoflessthan10Ω;and

9.10.3.7.4 atallstructureswithin800mofelectrifiedrailwaytracksormetalpipelineswherethepowerlineeithercrosses,orrunsparallelto,therailwayorpipeline.


ANNExURES

ANNEXURE 1: OPERATING INSTRUCTION FORM

SYSTEM CONTROLLER’S INSTRUCTIONS

STATION/LINE:.........................................................DATE:.................................

APPARATUS OPERATIONTOBECARRIEDOUT ✓

TimeReceived:____________________

TimeCompleted:______________________________________Signature


ANNEXURE 2: OPERATING AUTHORITY

SAFETY RULESOPERATING AUTHORITY

SITE...............................................

NAME:.....................................................DESIGNATION:.....................................................

Youareherebyauthorisedtoperformthedutiesasdefinedbelow:

Subclause Authorised duty Restricted toTransmittingmessagesAccesstolivechambersandprohibitedareasRighttopossesskeysPerform switching, isolating, safety testing andearthingoperationsSupervision of non-authorised staff-in-trainingcarryingouttheoperatingSupervisionofworkRestorationofsupplyintheeventoftheeventofthefailureorabsenceofcommunicationsSupervision,asateamleader,ofthesafeexecutionofliveworkPerformlivework

Otherauthorisation

Youareherebyauthorisedasaresponsibleperson,restrictedto........................................................................

............................................................................................................................................................................

Thisauthoritysupersedesallotherpreviousauthorities.

Recommended:Signature.................................................................Date............................................

Authorised:Signature.................................................................Date............................................

IherebyunderstandtheauthoritydetailedaboveandIacceptthedutiesandresponsibilitiessetouttherein.

Signature...........................................................................................Date............................................


ANNEXURE 3: WORK PERMIT FORM

APPLICATION TO WORK ON APPARATUS Number ............................

I,theresponsibleperson,amrequiredtocarryouttheworkdetailedbelowandIherebyrequesttheappointedoperatortopreparethenecessaryapparatusinaccordancewiththeSafetyStandards.

Apparatustobeworkedon...................................................................................................................

Worktobecarriedout ........................................................................................................................

........................................................................................................................

Pointsofisolation 1.....................................................................................................................

2.....................................................................................................................

Positionofrequiredearthingdevices 1.....................................................................................................................

2.....................................................................................................................

Responsibleperson ........................................... Appointedoperator........................

Date .......................................... TimeRequired...............................

WORK PERMIT Number ............................

I,theappointedoperator,herebynotifytheundersignedresponsiblepersonthattheapparatusdetailedintheaboveapplicationhasbeenpreparedinaccordancewiththeSafetyStandards,andwemutuallyagreethattheworkcanbecarriedout.

Specialendorsements(ifany)...............................................................................................................

Appointedoperator................................................. Responsibleperson....................................

Date......................................................................... Time...........................................................

Responsible person Appointed operator Date Time

Uniquenumber(s)ofkey(s)usedduringisolation.................................................................................

Keycabinetnumber..............................................................................................................................


CLEARANCE

I,theresponsibleperson,herebynotifytheundersignedappointedoperatorthattheworkdetailedintheaboveworkpermithasbeencompleted,allworkershavebeenwithdrawnfromthechambersor apparatus, and the apparatus is ready to be returned to service in accordancewith the SafetyStandards.

Specialcommentonworkperformed:...................................................................................................

...............................................................................................................................................................

Responsibleperson............................................... Appointedoperator....................................

Date...................................................................... TimeRequired...........................................


ANNEXURE 4: WORKER’S DECLARATION

Number..............................

I,herebydeclarethattheworktobecarriedoutunderPermitNohasbeenexplainedtomebytheundersignedresponsiblepersonandIthoroughlyappreciatethenatureandriskofthework.

Responsibleperson............................................................ Date..............................................

WORKER’S SIGNATURE AND ExTENSIONS

Date..............................Date..............................Date..............................Date.............................

Signature Time Signature Time Signature Time Signature Time

........................................Responsibleperson

........................................Authorisedperson







SPECIAL ENDORSEMENTS

Iherebydeclare that theundersigned responsiblepersonhas instructedme that I shallno longercontinuetoworkontheapparatusasdetailedunderPermitNo...........................................................

Date..............................Date..............................Date..............................Date.............................

Signature Time Signature Time Signature Time Signature Time




.

.......................................Responsibleperson


ANNEXURE 5: CONTROL PANEL LABEL/TAG

CONTROL PANEL LABEL/TAG No...................

STATION...........................................................................................

CONTROL PANEL..........................................................................

PERMIT NO. (if any).......................................................................

EARTHING DEVICES IN USE

No. Type Position Time Date

Appointedoperator..........................................................

Date..................................................................................


ANNEXURE 6: LIVE WORK DECLARATION FORM

No.......................

DECLARATION BY TEAM LEADER

Station/Line...................................

I....................................................theteamleaderconfirmthatallauto-reclosingfeaturesofbreaker(s)controllingthesupplyto..................................................................................................................aremadeinoperative,warningnoticesareaffixedtothecontrolpanelsofthebreakersconcerned,andtheHAND OUToftheapparatustomeforliveworkisconfirmedon:

Date:.................................................................................. Time.............................................

Theoperationalvoltageis...........................kV,thesafeworkingclearanceis..........................meters

Liveworktobedone:............................................................................................................................

...............................................................................................................................................................

Date:.................................................................................. Time.............................................

Authorisedpersonincharge..................................................................................................................

Date:.................................................................................. Time.............................................

Deputyauthorisedperson......................................................................................................................

WORKER’S DECLARATION TO PERFORM LIVE WORK

I/We,theundersignedresponsibleperson(s)performingliveworkconfirmthattheapparatustobeworkedonisasstatedabove,andunderstandtherestrictionsanddetailsofthework.

SIGN ON SIGN OFFName Signature Name Signature

Date: Time: Date: Time:


CLEARANCE

HAND BACK:Liveworkontheabovementionedapparatushasbeen*completed/suspended.Theworkers authorised to perform livework arewithdrawn from the apparatus and the apparatus ishandedbacktothesystemcontrolleron:

Date:.................................................................................. Time.............................................

Authorisedpersonincharge..................................................................................................................

* Delete which is not applicable * Worker’s declaration must be used if above space is in sufficient.


ANNEXURE 7: INDEMNITY FORM- SINGLE VISITORS

No...................

I, the undersigned (full name and surname) ......................................................................................ID .......................................................................beinganadult,doherebyonbehalfofmyself,myexecutors,myassigns,myheirsandallmydependentswhoarenowentirelyorpartlydependentuponmeorwhomaybeinfuturebesodependent,acknowledgeanddeclarethatwheneverIamallowedaccesstoanypowerstation,prohibitedarea,livechamber,station,buildingorotherpropertyofthelicenseeoranyaircraft,helicopterormotorvehicleforwhateverpurpose,willdosoatmyownriskandontheexpressconditionthatthelicensee,itsshareholders,employeesoragentsshallnotbeliabletomeoranydependentsoranyofthemfordamagesarisingoutoflossoflifeorbodilyinjuriessufferedbymeasaresultofanyincidentorcausewhichmayoccurordamageofwhatevernaturetoproperty,whetherornotsuchIncidentorothercausearisesfromnegligence,incompetenceoranyotherintentionalactonthepartofsuchemployeesoragents.

Iindemnify,holdharmlessandabsolvethelicensee,itsshareholders,employeesoragentsagainstandfromanydamagesarisingfromlossoflifeorbodilyinjuriessufferedasdescribedabove.

SIGNEDAT......................................ONTHIS.....................DAYOF................................20.........

NAME(PRINTED):.............................................................................................................................

SIGNATURE........................................................................................................................................

COMPANY:............................................................................TEL:.................................................

WITNESS(PRINTED):........................................................................................................................

SIGNATURE........................................................................................................................................


ANNExURE 8: INDEMNITY FORM- MULTIPLE VISITORS

No...................

I/We,havingsignedtheVisitorsDeclaration,accepttheconditionsofthisindemnityasstipulatedbelowandbeinganadult,doherebyonbehalfofmyself,myexecutors,myassigns,myheirsandallmydependentswhoarenowentirelyorpartlydependentuponmeorwhomaybeinfuturebesodependent,acknowledgeanddeclare thatwheneverIamallowedaccess toanypowerstation,prohibitedarea,livechamber,substation,buildingorotherpropertyofthelicenseeoranyaircraft,helicopterormotorvehicle forwhateverpurpose,will do so atmyown risk andon the expressconditionthat thelicensee, itsshareholders,employeesoragentsshallnotbeliabletomeoranydependentsoranyofthemfordamagesarisingfromlossoflifeorbodilyinjuriessufferedbymeasaresultofanyIncidentorcausewhichmayoccurordamageofwhatevernaturetoproperty,whetherornotsuchincidentorothercausearisesoutofnegligence,incompetenceoranyotherintentionalactonthepartofsuchemployeesoragents.

Iindemnify,holdharmlessandabsolvethelicensee,itsshareholders,employeesoragentsagainstandfromanydamagesarisingfromlossoflifeorbodilyinjuriessufferedasdescribedabove.

SIGN ON SIGN OFFName Signature Name Signature

Appointedoperator/Authorisedpersonincharge..................................................................................

EffectivefromDate:.......................................................... Time:............................................

ExpiredonDate:................................................................ Time:............................................


ANNExURE 9: ABBREVIATIONS

Advances Adv.Alternativecurrent/directcurrent AC/DCAppointedoperator A/OAuthorisedperson A/PAutoMaster A/MAutoFollower A/FAuto-reclose ARCAuxiliary Aux.Basicinsulationlevel BILBatteryCharger B/Chgr.BeingOpen B/OBeingClosed B/CBreaker Bkr.BusCoupler B/Coupl.BusSectionLinks B.S.L.BusStripIsolatingLink B.S.I.LBusSection B/Sect.BusLinkorBusbarLink B.B.L.Busbar BBDegreesCelsius 0CCapacitor Cap.Carrier Carr.CouplingTransformer Coupl./TrfrCouplingLinks Coupl.L.DieselGen.Transformer DG.TrfrDistributionStation D/SDiversionWeir D/WeirDropOutFuseLink D.O.F.EarthLink EL.EarthFault E/FFeeder Fdr.Generator Gen.HandBack H/BHandOut H/OHandOver H/OverHertz HzHighvoltage HVHumanmachineinterlace HMIIsolated+Earth I+EJoule JKilogram kgKilovolt kVKilowatthour kWh;LineLink L.L.LowVoltage LVMaintenance Mtce.MediumVoltage MVMeter mMillimeter mmMillicoulomb mCNamibianElectricitySafetyCode NESCOhm Ω


OperatingInstructionForm OlEOutofCommission OOCOverCurrent 0/CPascal PaPhase orPH(‘s)PowerStation P/SPre-authorisedinstruction P/Ainst.RackOut RIORecloser Recl.RegulatingTransformer Reg.TrfrResponsibleemployee R/EResponsibleofficial RIOResponsibleperson RIPRootmeansquare RMSSingleWireEarthReturn SWERSpringoperatedisolatinglinks S.0.1.StaticVarCompensator SVC.StationTransformer Stn./Trfr.StationBoard Stn./Brd.Station S/SSupervisory Superv.Synchronised Sync.SystemControl SysconSystemcontroller sicTapchanger T/ChTesttobedeadon3Phases T.D.3HP’sTotaloftwobays(ormore) T2BorT’n’BTransformer TrfrUnitTransformer Unt./GrfrUnitboards Unt./Brd.Weightoperatedisolatinglinks W.O.L.WorkingEarths W/E

________________

Electricity Safety Code · 2017. 10. 18. · NAMIBIAN ELECTRICITY SAFETY CODE, 2009: ELECTRICITY ACT, 2007 The Electricity Control Board has under section 3(4) of the Electricity

Documents