Hazardous Area Location Guide - IEC NEC CEC & ATEX By Emerson Industrial

IEC, NEC, CEC, ATEX HAzArdous LoCATIoN GuIdE

EGs Electrical Group9377 W. Higgins RoadRosemont, IL 60018

1.800.621.1506www.egseg.com

Canada

888.765.2226

Mexico

52.55.5809.5070

Asia/Pacific

65.6891.7600

China

86.21.5426.0668

Middle East

971.4.8838.831

Europe

33.1.4817.8502

South AmericaNutsteel Indústria Metalúrgica Ltda.

São Paulo/SP – Brazil

55.11.2122.5777

Macaé/RJ – Brazil

55.22.2770.4686

Camaçari/BA – Brazil

55.71.3623.2028

CHART 14 — IEC PRoTECTIon TECHnIquEs foR HAzARdous AREAs

fLAMEPRoof “d”

• ZONE1• Containinternalexplosion• Controlexternaltemperatureofenclosure• SimilartoNEC®explosionproof• Usuallycastenclosure• Typicaluseinlightingandmotorstarters

REQUIREMENTS:• Internalexplosioncannotbetransmittedoutsideenclosure• Externaltemperatureofenclosurebelowignitiontemperatureofsurroundinggases• Cablefittingsmusthave5threadsengaged• Internalandexternalgroundscrew

InCREAsEd sAfETy “e”

• ZONE1• Highimpactresistantenclosures—FRP,GRP,sheetsteel/aluminum,stainlesssteel• Enclosurewillnotholdstaticcharge• MaintainminimumofIP54ingressprotection• Apparatusnonarcing/sparking• Typicaluseinterminalenclosures

REQUIREMENTS:• UseIECapprovednon-looseningscrewtypeinIECapprovedenclosures• Controlinternalandexternaltemperature

fLAMEPRoof PLus InCREAsEd sAfETy “de”

“d”

“e”

• ZONE1• Locationofarcinghas“d”protection(flameproof)• Connectionterminalshave“e”protection(increasedsafety)• Typicaluseinswitches,lighting,controls,plugsandreceptacles/sockets

Items such as power outlets, switches, some lighting, etc., cannot be protected by “e” mode only. In this case “d” and “e” are combined. REQUIREMENTS:• Areawherearccanbeproducedis“d”orflameproofinarestrictedvolumeenclosure-oftencontactblocksandswitches• Areawithconnectionterminalsis“e”orincreasedsafety• Controlsinternalandexternaltemperatures

InTRInsIC sAfETy “ia” - “ib” - “ic”

• iaZONE0• ibZONE1• icZONE2• Incapableofreleasingenoughenergytocauseanexplosion• Typicaluseincommunicationequipment

REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas

EnCAPsuLATIon “m”

• ZONE1• Epoxyorotherresintototallysealarcingandsparkingdevices• Typicaluseinlightingcontrolsandsealedswitches

REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyepoxyorotherresin• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures

non-sPARKInG “n”

• ZONE2• Enclosurerestrictsingressofhazardousgases• nA=nonsparkingconstruction• nR=restrictedbreathing• nC=hermeticallysealed,nonincendive• Typicaluseinlightingfixtures

REQUIREMENTS:• Equipmenthasnonormallyarcingparts• Thermaleffectsincapableofignition• nA=nonsparking• nR=restrictedbreathing• nC=hermeticallysealednonincendive

oIL IMMERsIon “o”

• ZONE1• Oiltotallysealsarcingandsparkingdevices• Typicaluseinhazardousratedtransformersandswitches

REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyoil• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures

PREssuRIzEd APPARATus “p”

• ZONE1• Expelsignitablevapor/gas• Maintainspositiveenclosurepressure

REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas

PoWdER fILLInG “q”

• ZONE1• Finelygroundpowdertototallysealarcingandsparkingdevices• Typicaluseinlighting,controlsandsealedswitches

REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyfinelygroundpowder• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures

CHART 15 — IEC PRoTECTIon TECHnIquEs foR AREAs WITH CoMbusTIbLE dusT

InTRInsIC sAfETy “id”

• iaDforuseinZONE20,21,22• iaDforuseinZONE21,22• (ExibD)associatedelectricalapparatus-installationinthesafeareas• Incapableofreleasingenoughenergytocauseanexplosion• Typicaluseincommunicationequipment

REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas

EnCAPsuLATIon “md”

• maDforuseinZONE20,21,22• mbDforuseinZONE21,22• Epoxyorotherresintototallysealarcingandsparkingdevices• Typicaluseinlighting,controlsandsealedswitches

REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyepoxyorotherresin• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures

PREssuRIzATIon “pd”

• ZONE21,22• Expelsignitablevapor/gas• Maintainspositiveenclosurepressure

REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas

PROTECTIONBYENCLOSURES“tD”

• tDA21ProcedureAforZONE21• tDB21ProcedureBforZONE21• Highimpactresistantenclosures—FRP,GRP,sheetsteel/aluminum,stainlesssteel• Enclosurewillnotholdstaticcharge• MaintainminimumofIP54ingressprotection• Apparatusnonarcing/sparking• Typicaluseinterminalenclosures

REQUIREMENTS:• UseIECapprovednon-looseningtypeenclosures• Controlinternalandexternaltemperature

CHART 1 — WHAT Is An IEC zonE?

The IEC has defined 3 areas of hazardous gas or vapor release as follows:

ZONE0 zonE 1 ZONE2

ExplosiveAtmosphereIsContinuouslyPresent ExplosiveAtmosphereIsOftenPresent ExplosiveAtmosphereMayAccidentallyBePresent

>1000hours/year 10-1000hours/year 0.1-10hours/year

Zoneinwhichanexplosivemixtureofgas,vaporormistiscontinuouslypresent.

Zoneinwhichanexplosivemixtureofgas,vaporormistislikelytooccurduringnormaloperation.

Zoneinwhichanexplosivemixtureisnotlikelytooccurinnormaloperation,andifitoccurswillonlyexistforashorttime(leaksormaintenance).

The IEC has defined 3 areas of hazardous/combustable dusts as follows:

ZONE20 ZONE21 ZONE22

ExplosiveAtmosphereIsContinuouslyPresent ExplosiveAtmosphereIsOftenPresent ExplosiveAtmosphereMayAccidentallyBePresent

>1000hours/year 10-1000hours/year 0.1-10hours/year

Zoneinwhichanexplosivemixtureofdustiscontinuouslypresent.

Zoneinwhichanexplosivemixtureofdustislikelytooccurduringnormaloperation.

Zoneinwhichanexplosivemixtureofdustisnotlikelytooccurinnormaloperation,andifitoccurswillonlyexistforashorttime(leaksormaintenance).

CHART12—undERsTAndInG THE InGREss PRoTECTIon sysTEM

IPTheIECIPclassificationsystemdesignatesthedegreeofprotectionprovidedbyanenclosureagainstimpactand/orwaterordustpenetration(ingress).Ithastwonumbers;first—protectionagainstsolidobjects,secondprotectionagainstliquid.

EXAMPLE:IP54

1sT fIGuRE:protectionagainstsolidbodies 2nd fIGuRE:protectionagainstliquids

IP TEsTs IP TEsTs

0 Noprotection 0 Noprotection

1 Protectedagainstsolidbodieslargerthan50mm(e.g.accidentalcontactwiththehand) 1 Protectedagainstvertically-fallingdropsofwater

(condensation)

2 Protectedagainstsolidbodieslargerthan12.5mm(e.g.fingerofthehand) 2 Protectedagainstdropsofwaterfallingatupto15˚

fromthevertical

3 Protectedagainstsolidbodieslargerthan2.5mm(tools,wires) 3 Protectedagainstdropsofrainwateratupto60˚from

thevertical

4 Protectionagainstsolidbodieslargerthan1mm(finetools,smallwires) 4 Protectedagainstprojectionsofwaterfromall

directions

5 Protectedagainstdust(noharmfuldeposit) 5 Protectedagainstjetsofwaterfromalldirections

6 Completelyprotectedagainstdust 6 Completelyprotectedagainstjetsofwaterofsimilarforcetoheavyseas

7 Protectedagainsttheeffectsoftemporaryimmersion

8 Protectedagainsteffectsofprolongedimmersionunderspecifiedconditions

GLossARy

AEx SymboldesignatesequipmentbuilttoNEC®standardsforuseinNEC®Zonedesignatedareas.SuchproductsarenotsuitableforuseinATEXorIECExapplications.

ATEXATmosphèresEXplosibles–OrganizationsintheEUwhere‘explosionrisk’exists,mustusetheguidelinesforprotectingtheemployeesofthecompanies.ManufacturerswhoapplyitsprovisionsandaffixtheCEmarkingareabletoselltheirequipmentanywhereinEUwithoutanyfurtherrequirementsbeingappliedwithrespecttotheriskscoveredbeingapplied.

CEC CanadianElectricCode.

CENELECEuropeanCommitteeforElectricalStandardization.CENELECdevelopselectrotechnicalstandardsthatareadoptedasEuronormsbytheEUforelectricalandelectronicgoodsandservices.Itiscomprisedofagroupof31Europeancountriesand11affiliatedcountriesthathaveCENELECstandardsbasedontheparallelworkingIEC/CENELEC.

Class I TermusedinNEC®todescribelocationsinwhichflammablegasesorvaporsareormaybepresentintheairinquantitiessufficienttoproduceexplosiveorignitablemixtures.

Class II TermusedinNEC®todescribelocationsthatarehazardousbecauseofthepresenceofcombustibledust.

Class III TermusedinNEC®todescribelocationsthatarehazardousbecauseofthepresenceofeasilyignitablefibersorflyingsbutinwhichsuchfibersorflyingsarenotlikelytobeinsuspensionintheair.

CSA CanadianStandardAssociation-Providerofproducttesting&certificationservicesforUS,Canadaandcountriesworldwide,forelectrical,plumbing,gas&mechanicalproducts.

Division 1 TermusedinNEC®todescribetheconditioninwhichthehazardcanbepresentduringnormalconditions.

Division 2 TermusedinNEC®todescribetheconditioninwhichthehazardispresentonlyunderabnormalconditions.

CHART 13 — APPROxIMATECONvERSIONOfNEMAENCLOSURETYPERATINgSTOIEC60529ENCLOSURECLASSIfICATIONDESIgNATIONS(IP)(Cannot be Used to Convert IEC classification Designations to NEMA Type Ratings or vice versa)

IPfirst Character

NEMAEnclosureTypeIP second Character

1 2 3,3x,3S,3Sx 3R. 3RX 4,4x 5 6 6P 12,12K,13

IP0_ IP_0

IP1_ IP_1

IP2_ IP_2

IP3_ IP_3

IP4_ IP_4

IP5_ IP_5

IP6_ IP_6

IP_7

IP_8

A B A B A B A B A B A B A B A B A B

A=Ashadedblockinthe“A”columnindicatesthattheNEMAEnclosureTypeexceedstherequirementsfortherespectiveIEC60529IPFirstCharacterDesignation.TheIPFirstCharacterDesignationistheprotectionagainstaccesstohazardouspartsandsolidforeignobjects.

B=Ashadedblockinthe“B”columnindicatesthattheNEMAEnclosureTypeexceedstherequirementsfortherespectiveIEC60529IPSecondCharacterDesignation.TheIPSecondCharacterDesignationistheprotectionagainsttheingressofwater.

Example of Table Use:AnIECIP45EnclosureRatingisspecified.WhatNEMATypeEnclosuresmeetandexceedtheIP45rating?

Referencingthefirstcharacter,4,intheIPratingandtherowdesignated“IP4_”intheleftmostcolumninthetable;theblocksinColumn“A”forNEMATypes3,3X,3S,3SX,3R,3RX4,4X,5,6,6P,12,12Kand13areshaded.TheseNEMAratingsmeetandexceedtheIECprotectionrequirementsagainstaccesstohazardouspartsandsolidforeignobjects.

CHART 3 — AREA CLAssIfICATIon—IEC vs nEC®/CEC (CLAss/dIVIsIon/GRouP)

InflammableMaterial IEC/CEnELEC nEC®/CEC

gasesandvapors Protection zone group Sub- division Class Division group

Acetylene dand/ore 1or2 II C I 1or2 A

Hydrogen dand/ore 1or2 II B+H2 I 1or2 B

Propyleneoxide,Ethyloxide,Butadiene dand/ore 1or2 II B I 1or2 B

Cyclopropane,Ethylether,Ethylene dand/ore 1or2 II B I 1or2 C

Acetone,Benzene,Butane,Propane,Hexane,Paintsolvents,Naturalgas dand/ore 1or2 II A I 1or2 D

CHART 8 — sIMPLIfIEd…WHERE To usE

Equipmentlisted/markedfor: Use—asNoted

NEC®ClassI,Div.1 OKforuseinNEC®ClassI,Zone1and2

NEC®ClassI,Div.2 OKforuseinNEC®ClassI,Zone2

NEC®ClassI,Zone1 NOTOKforuseinNEC®ClassI,Div.1

NEC®ClassI,Zone2 OKforuseinNEC®ClassI,Div.2

NEC®AEx OKforNEC®Zone0,1,2asmarked

NEC®AEx NOTsuitableforNEC®ClassI,Div.1

NEC®AEx OKforuseinNEC®ClassI,Div.2

IECZone1 NOTsuitableforanyNEC®area

IECZone2 NOTsuitableforanyNEC®area

IECExorCENELECEEx NOTsuitableforanyNEC®area

CHART 7 — EXAMPLEs of nEC®/CECCLASSI,DIvISION1AND2SITUATIONS

CLASSI,DIvISION1 CLASSI,DIvISION1AND2 non CLAssIfIEd

EXAMPLE 1

CONDITIONS: ClassI,Division1hazardexistsduringnormaloperation

conditions• Openairmixingtank• Productsstoredinworkarea Areaclassifiedbasedonpropertiesofvaporspresent ElectricalequipmentmustuseapprovedDiv.1NEC®

protectiontechniquesandwiringmethods

ExAMPLE2

CONDITIONS: Division2areacanexistwherevaporsarenormallyinclosedsystemorcontainers Division1and2areasseparatedbybarrierorspace

(transitionzone)• Hazardousareasproperlydocumented• Div.2mustuseapprovedNEC®wiringmethodsandproducts StoredproductsoutsideDiv.1workarea Nonhazardousarea

EXAMPLE 3

CONDITIONS: ClosedtankandpipingconfinesDiv.1 YellowareaqualifiesasDiv.2 Storedproductsnotpresent Purged/pressurizedcontrolroomqualifiesas“nonhazardous”issealedofffrom

Div.2area ElectricalequipmentinDiv.2mustuseapprovedDiv.2protectiontechniques

andproducts

CHART 6 — EXAMPLEs of IEC zonE CLAssIfICATIon sITuATIons

ZONE0 zonE 1 ZONE2 non HAzARdous zonE

EXAMPLE 1

CONDITIONS: Allmanualventilation Zone0area Zone1area Nonhazardousarea• Openairmixingtank• Nomechanicalventilation• Productsstoredinworkarea

ExAMPLE2

CONDITIONS: Hoodovertank Zone0area Zone1area Zone2area Nonhazardousarea Mechanicalventilation Storedproductsseparatedfromworkarea

EXAMPLE 3

CONDITIONS: Tankclosed Mechanicalventilation Zone0 Zone2 Nonhazardousarea• Operationscontroloutsidezones

CHART 5 — GRouPs And subGRouPs CLAssIfICATIon — IEC

groups Subgroups TypicalSubstance Application/Definition

GroupI I MethaneElectricalEquipmentforuseinminessusceptibletofiredamp(Not applicable to ATX Series Products)

GroupII

IIA Propane

ElectricalequipmentforuseinplaceswithanexplosivegasatmosphereIIB Ethylene

IIC Hydrogen

GroupIII(new)

IIIA Combustibleflyings

ElectricalequipmentforuseinplaceswithanexplosivedustatmosphereIIIB Non-conductivedust

IIIC Conductivedust

CHART2—CoMPARInG IEC zonEs And nEC®/CEC dIVIsIons

ZONE0/ZONE20 ZONE1/ZONE21 ZONE2/ZONE22

dIVIsIon 1 DIvISION2

CHART 4 — IEC vs nEC®/CEC TEMPERATuRE CLAssIfICATIon CoMPARIson

Max.Surface Temp.(°C) 85 100 120 135 160 165 180 200 215 230 260 280 300 450

IECClassification T6 T5 T4 T3 T2 T1

NorthAmericanClassification T6 T5 T4A T4 T3C T3B T3A T3 T2D T2C T2B T2A T2 T1

CHART9—EquIPMEnT MARKInGs

undERsTAndInG IEC MARKInGs †

Ex de II C T6 Gb ‡

Gaforzone0Gbforzone1Gcforzone2

TemperatureClassT6=Max85˚°CSurfaceTemperatureGasSubdivision

Group-C=Acetelyne

GroupII=SurfaceEquipmentGroupI=Mines

TypeofProtectiond=“flameproof”

TypeofProtectione=“increasedsafety”

ExplosionProtectedMeetsIECStandards

AEx=EquipmentconformstoNEC®

† Alternate marking: Ex deb IIC T6. ‡ This only applies to IEC Standards only. See “Chart 10 — Understanding IEC Equipment Protection Level Requirements” below.

undERsTAndInG nEC®/CEC MARKInGs

ClassI Division1 groupAA=Acetylene

I=GasandVapors1=Hazardnormallypresent B=Hydrogen

II=Dust2=Hazardabnormallypresent C=Ethylene

III=FibersandFlyingsD=GasolineE=ElectricallyConductiveDustF=FuelDustG=GrainDust

undERsTAndInG ATEX MARKInGs (Directive94/9/EC)*

••• II 1 G

CEMarkingSymbol

IDNo.ofNotifiedBodyoftheQASystem

EUExplosiveAtmospheresSymbol

Surface(non-mining)Equipment

EquipmentCategory

TypeofFlammableSubstance

Ex ia IIC T4 Ga

Ex:ConformitytoIECandATEXHazardousareastandards;SuitabilityforuseinIECandATEXhazardouslocations

ProtectionMethod(intrinsicsafety)

GasGroup(acetylene&hydrogen)

TemperatureClass

EquipmentLevelProtection:

Gaforzone0Gbforzone1Gcforzone2

* See “Chart 11 — ATEX Equipment Category” below.

CHART 11 — ATEX EquIPMEnT CATEGoRy

TheATEXdirectiveadds“TheEquipmentCategory”tothemarkingwhichindicatesthelevelofprotectionwhichcorrelatesbacktothemanufacturersqualityassurancerequirementsasshownonthischart.

Equipmentgroup EquipmentCategoryand LevelofProtection

PresenceorDurationof ExplosiveAtmosphere flammableSubstances Correlationwith

HazardousAreas

I-Mines

M1-Veryhighlevelofprotection

ContinuosPresence Methane,CombustibleDustM2-Highlevelofprotection

II-Surface

1-Veryhighlevelofprotection ContinuousPresence

G-Gas,VaporsD-Dust

Zone0(Gasetc.)Zone20(Dust)

2-Highlevelofprotection LikelytoOccur Zone1(Gasetc.)Zone21(Dust)

3-Normallevelofprotection UnlikelytoOccur Zone2(Gasetc.)Zone22(Dust)

GLossARy

Ex DesignationforhazardouslocationequipmentcomplyingtoIECandATEXstandards.

Flameproof AnIECorEuropeantermusing“containment”protection.Similarto,butnotexactlythesameasUS“explosionproof”.

Group

ClassI:TermusedinNEC®todefineacollectionofgaseswithsimilarphysicalpropertiessuchasmaximumexplosionpressure.ClassII:TermusedinNEC®todefineacollectionofhazardousdustswithsimilarphysicalcharacteristicssuchasignitiontemperatureaswellasattributessuchasblanketingeffectonequipment.ClassIII:TherearenoGrouplistings.

Hazardous LocationExistswhenamanufacturing,storageorhandlingprocessprovidesafuel,consistingofaflammablegas,combustibledust,combustibleflyingorfiber,orsomecombinationofthesethreeelements;andtheseflammablecomponentscanbemixedwithenoughoxygenfromtheambientairtoformanexplosiveatmospherebetweentheLowerExplosiveorFlammableLimit(LEL/LFL)andtheUpperExplosiveorFlammableLimit(UEL/UFL).

IEC InternationalElectrotechnicalCommission-InternationalStandardsandconformityassessmentforallelectrical,electronicandrelatedtechnologies.

IECEx InternationalElectrotechnicalCommissionExplosiveAtmospheres-AnIECExSchemeprovidesameansformanufacturersofEXequipmenttoobtainExcertificatesofconformitythatwillbeacceptedatnationallevelinallparticipatingcountries.

NEC® NationalElectricCode-Governstheinstallationofelectricalconductors,equipment,andraceways.

Subdivision Zonesystemgroupingofvariousgas/vaporsroughlyequaltoNEC®“Group”.

UL UnderwritersLaboratories-AUStestingandcertificationorganization.

Zone Definesconditionsunderwhichexplosivegasesarepresentinanarea.Zonesaresimilartodivisions,butaregenerallybasedonlengthoftimehazardousmaterialmaybepresent.

CHART10—UNDERSTANDINgIECEqUIPMENTPROTECTIONLEvELREqUIREMENTS

Protection Afforded

EquipmentProtectionLevel(EPL) group PerformanceofProtection ConditionsofOperation

Veryhigh

Ma GroupIRequirestwoindependentmeansofprotectionor

remainssafewhentwodifferentmalfunctionsoccur

Equipmentusedinexplosiveatmosphere

Ga GroupII UsedinZones0,1and2

Da GroupIII Usedinzones20,21,and22

High

Mb GroupI Goodforuseinnormalandsevereoperatingconditions Equipmentde-energizedinexplosiveatmosphere

Gb GroupII Goodforuseinnormaloperationorwhereequipmentmalfunctionsareconsidered

UsedinZones1and2

Db GroupIII UsedinZones21,and22

EnhancedGc GroupII

GoodfornormaloperationUsedinZones2

Dc GroupIII Usedinzones22