NAPIT ElectricalCertificate Installation/Modification Industrial Commercial Amend 3 17.8... · is to the best of my knowledge and belief in accordance with BS 7671:2008, amended to

.

NAPIT Electrical Certificate Installation/ModificationRequirements for Electrical Installations – BS 7671: 2008incorporating Amendment No. [IETWiring Regulations]

person or persons competent in such work. The maximum time

ClientAddress

Postcode

Installation (if different from client)Address

Postcode

Details of the installation

I/we the designer s recommend that this installation is further inspected after an interval of not more than years/months.

2

1

NAPIT Electrical Certificate Installation/Modification

Description, extent and limitations of the installation (note 5)

Installation is New Addition Alteration Records available Yes No Date of original installation

Description of installation

my knowledge and belief in accordance withBS 7671:2008, amended to (date).

The extent of liability of the signatory or the signatories is limited to the work described in Section 2 as subject of this certificate.For the CONSTRUCTION of the installation:

4

Company nameInstallerCompany address

Postcode

Signature

PositionDateNAPIT membership No.

Company nameInspectorCompany address

Postcode

Signature


For inspection and testingI the person responsible for the inspection and testing of the electrical installation (as indicated by mysignature below), particulars ofwhich are described in Section 2, having exercised reasonable skill and care when carrying out the inspection and testing herebyCERTIFY that the work for which I have been responsible is to the best of my knowledge and belief in accordance withBS 7671:2008, amended to (date)The extent of liability of the signatory or the signatories is limited to the work described in Section 2 as subject of this certificate.For the INSPECTION AND TESTING of the installation:

Next inspection

5

For constructionI being the person responsible for construction of the electrical installation (as indicated by my signature below), particulars of which aredescribed in Section 2, having exercised reasonable skill and care when carrying out the construction hereby CERTIFY that theconstruction work for which I have been responsible is to the best of

Postcode


3

Requirements for Electrical Installations – BS 7671:2008 incorporatingAmendment No. [IET Wiring Regulations 17th Edition]

I being the person responsible for of the electrical installation (as indicated by myparticulars of which are described in Section 2, having exercised reasonable skill and care when carrying out the

hereby CERTIFY that the for which I have been responsibleis to the best of my knowledge and belief in accordance with BS 7671:2008, amended to (date).The extent of liability of the signatory or the signatories is limited to the work described in Section 2 as subject of this certificate. FortheCompany name SignatureInstallerCompany address

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NAPIT Administration Centre, 4th Floor, Mill 3, Pleasley Vale Business Park, Mansfield, Nottinghamshire NG19 8RL

This form is based on the requirements of Appendix 6 of BS 7671

NA/EIC/CF/001 (V3)

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2015

http://www.napitonline.com/members/


NAPIT Electrical Certificate Installation/Modification

Supply characteristics and earthing arrangements

Earthing Arrangements TN-S TN-C-S TT Other Please specify:

Number & type of live conductors a.c. d.c. No. of phases No. of wires

Nature of Supply Parameters (Note: (1) by enquiry, (2) by enquiry or by measurement)

V Nominal frequency, f(1) Hz Confirmation of supply polarity

kA

Nominal voltage, U/Uo(1)

Type

External loop impedance, Ze (2)

A

Other Sources of Supply (as detailed on attached schedule)

Particulars of installation referred to in this certificate

Means of Earthing Distributor’s facility Installation earth electrode

Details of Installation Earth Electrode (where applicable) Type (e.g. rod(s), tape etc)

Location

Maximum demand

Max Demand (load) kVA/Amps (delete as appropriate)

Main Protective Conductors Material Csa (mm2)

Location BS(EN) No.of Poles Current rating A

If RCD main switch: Rated residual operating current I n = mA Rated time delay ms (at I n)

Comments on existing installation (in the case of addition or alteration see Section 633)

Fuse/device rating or setting A Voltage rating V

(For additions or alterations) cables concealed within trunking and conduits, or cables or conduits concealed under floors, in roof spaces and generally within the fabric of the building or underground may not have been inspected. Schedule of inspections & test results attached.

For Designer 1Company nameDesignerCompany address

Postcode

Signature

For Designer 2**(if applicable)Company nameDesignerCompany address

Postcode

Date

Date

I/we being the person(s) responsible for of the electricalinstallation (as indicated by my/our signature below), particulars ofwhich are described in Section 2, having exercised reasonable skill

I/we being the person(s) responsible for of the electricalinstallation (as indicated by my/our signature below), particulars ofwhich are described in Section 2, having exercised reasonable skilland care when carrying out the design hereby CERTIFY that thedesign work for which I/we have been responsible is to the bestof

BS 7671:2008, amended to (date).Signature

NAPIT membership No.

NAPIT membership No.

BS 7671:2008, amended to (date).

my/our knowledge and belief in accordance with

Electrode resistance to earth

Requirements for Electrical Installations – BS 7671:2008 incorporatingAmendment No. [IET Wiring Regulations 17th Edition]

Page ofNA

and care when carrying out the design hereby CERTIFY that thedesignwork for which I/we have been responsible is to the bestof my/our knowledge and belief in accordance with

This form is based on the requirements of Appendix 6 of BS 7671

design

Rated Current

Supply ConductorsMain Switch / Switch Fuse / Circuit Breaker / RCD

Measured operating trip time ms

Prospective fault current, I pf (2)

Supply Protective Device BS(EN)

NA/EIC/CF/001 (V3)

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NAPIT Main Intake & Associated Circuits Industrial/Commercial Inspection Schedule

1

4

Item No. Description

1.0 CONDITION / ADEQUACY OF DISTRIBUTOR’S / SUPPLY INTAKE EQUIPMENT

1.1

1.2

1.3

1.4

1.5

1.6

Service cable

Service head

2.0

3.0 AUTOMATIC DISCONNECTION OF SUPPLY

Main Earthing / Bonding Arrangements (411.3; Chap 54)

Presence of distributor’s earthing arrangement (542.1.2.1; 542.1.2.2),

or Presence of installation earth electrode arrangement (542.1.2.3)

Adequacy of earthing conductor size (542.3; 543.1.1)

Adequacy of earthing conductor connections (542.3.2)

Accessibility of earthing conductor connections (543.3.2)

Adequacy of main protective bonding conductor sizes (544.1)

Adequacy and location of main protective bonding conductor connections (543.3.2; 544.1.2 )

Accessibility of all protective bonding connections (543.3.2)

Provision of earthing / bonding labels at all appropriate locations (514.13)

FELV- requirements satisfied (411.7: 411.7.1)

4.0

4.1

OTHER METHODS OF PROTECTION (Where the methods listed below are employed details should be provided on separate sheets)Non-conducting location (418.1)

4.2 Earth-free local equipotential bonding (418.2)

4.3 Electrical separation (Section 414;418.3)

4.4 Double insulation (Section 412)

4.5 Reinforced insulation (Section 412)

Schedule of InspectionsOutcomes

Inspector’s Name

DateSignature

3.2

3.3

3.4

3.5

3.1.1

3.6

3.7

3.8

Outcome

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NA/EIC

Distributors Eathing arrangements

Meter tails –Distributor / Consumer

Metering equipment

Isolator

Presence of adequate arrangements for parallel or switched alternative sources (551.6; 551.7)

Adequate arrangments where a generating set operates as a switched alternative to the public supply [551.6]

Adequate arrangments where a generating set operates in parallel with the public supply (551.7)

2.1

2.2

2

3

Sheet 1 of 3 NA/MI/CF/001 (V3)

3.1.2

3.9

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Insert tick to indicate an inspection has been carried out and the result is satisfactory � Insert N/A to indicate that the inspection is

not applicable to a particular item: N A

Requirements for Electrical Installations – BS 7671:2008 incorporatingAmendment No.3, 2015 [IET Wiring Regulations 17th Edition]All items inspected to confirm as appropriate, compliance with the relevant clauses in BS 7671


5Item No. Description

5.0

5.1

5.2

5.3

5.4

5.5

5.6

DISTRIBUTION EQUIPMENT

Adequacy of Working space / accessibility to equipment (132.12; 513.1)

Security of fixing (134.1.1)

Condition of insulation of live parts (416.1)

Adequacy / security of barriers (416.2)

Condition of enclosure(s) in terms of IP rating etc (416.2)

5.10 Presence of main switch(es), linked where required (537.1.2; 537.1.4)

5.11 Operation of main switch(es) (functional check) (612.13.2)

5.12 Manual operation of circuit-breakers and RCDs to prove disconnection (612.13.2)

5.13

5.14

Confirmation that integral test button / switch causes RCD(s) to trip when operated (functional check) (612.13.1)

RCD(s) provided for fault protection – includes RCBOs (411.4.9; 411.5.2;531.2)

5.15 RCD(s) provided for additional protection where required – includes RCBOs (411.3.3; 415.1)

5.16 Presence of RCD retest notice at or near equipment where required (514.12.2)

5.17

5.18

Presence of diagrams, charts or schedules at or near equipment where required (514.9.1)

Presence of non-standard (mixed) cable colour warning notice at or near equipment where required (514.14.)

5.19 Presence of alternative supply warning notice at or near equipment where required (514.15)

5.20 Presence of next inspection recommendation label (514.12.1)

5.21 Presence of other required labelling (Please specify) section 514

5.22

5.23

Examination of protective device(s) and base(s); correct type and rating (no signs of unacceptable thermal damage, arcing or overheating) (411.3.2;411.4.5,.6;432;433) Single-pole switching or protective devices in line conductors only (132.14.1, 530.3.2)

5.24 Protection against mechanical damage where cables enter equipment (522.8.1; 522.8.11)

5.25 Protection against electromagnetic effects where cables enter ferromagnetic enclosures (521.5.1)

Outcomes

Inspector’s Name

DateSignature

Enclosure not damaged / deteriorated so as to impair safety (621.2 (iii) )

Presence and effectiveness of obstacles (417.2)5.8

5.7

Outcome

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NA/EIC

Sheet 2 of 3 NA/MI/CF/001 (V3)

Condition of enclosure(s) in terms of fire rating etc (421.1.6: 421.6.201:526.5)

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NAPIT Administration Centre, 4th Floor, Mill 3, Pleasley Vale Business Park, Mansfield, Nottinghamshire NG19 8RL Sheet 3 of 3 NA/MI/CF/001 (V3)

6


6.0 DISTRIBUTION CIRCUITS

6.1

6.2 Cables correctly supported (522.8.5)

6.3 Condition of insulation of live parts (416.1)

6.4 Non-sheathed cables protected by enclosure in conduit, ducting or trunking (521.10.1)

6.5 Suitability of containment systems for continued use (including flexible conduit) (Section 522)

6.6 Cables correctly terminated in enclosures (Section 526)

6.7

6.8

Adequacy of cables for current-carrying capacity with regard for the type and nature ofinstallation (Section 523)6.9

Adequacy of protective devices; type and rated current for fault protection (411.3)6.10

Presence and adequacy of circuit protective conductors (411.3.1.1, 543.1)6.11

Co-ordination between conductors and overload protective devices (433.1; 533.2.1)6.12

Cable installation methods / practices with regard to the type and nature of installation andexternal influences (Section 522)

6.13

Where exposed to direct sunlight, cable of a suitable type (522.11.1)6.14

Cables installed in prescribed zones (see extent and limitations) (522.6.202)6.15Cables incorporating earthed armour or sheath, or run within earthed wiring system, or otherwiseprotected against mechanical damage caused by nails, screws and the like (see extent andlimitations) (522.6.101; 522.6.103)

6.16

6.17

6.18

6.19

6.20 Cables segregated / separated from non-electrical services (528.3)

6.21 Condition of circuit accessories (621.2 (iii))

6.22 Suitability of circuit accessories for external influences (512.2 )

6.23

6.24

Single-pole switching or protection devices in line conductors only (132.14.1, 530.3.2)

6.25

6.26 General condition of wiring systems (621.2(ii))

6.27 Temperature rating of cable insulation (522.1.1; Table 52.1)

Outcomes

Inspector’s Name

DateSignature

Outcome

Confirmation that ALL conductor connections,including connections to busbars are correctly located in terminals and are tight and secure (526.1)

Identification of conductors (514.3.1)

P rovision of ad ditional protection by 30 m A RCD for cables con cealed in walls (522.6.202; 522.6.203)

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Examination of cables for signs of unacceptable thermal or mechanical damage / deterioration (421.1; 522.6)

Provision of fire barriers, sealing arrangements and protection against thermal effects (Section 527)

Band II Cables segregated / separated from Band I cables (528.1)

Adequacy of connections, including cpc[s], within accessories and to fixed and stationary equipment – identify / record numbers and locations of items inspected in (Section 526) Presence, operation and correct location of appropriate devices for isolation and switching (537.2)

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1.0 DISTRIBUTION BOARD

1.1 Adequacy of Working space / accessibility to equipment (132.1.2; 513.1)

1.2 Security of fixing (134.1.1)

1.3 Condition of insulation of live parts (416.1)

1.4

1.5

1.6

1.7

Adequacy / security of barriers (416.2)

Condition of enclosure(s) in terms of IP rating etc (416.2)

Condition of enclosure(s) in terms of fire rating etc (421.1.6;421.1.200 ;526.5)

Enclosure not damaged / deteriorated so as to impair safety (621.2 (iii))

1.8 Presence of isolator (537.1.2; 537.1.4)

1.9

1.10

Operation of isolator (functional check) (612.13.2)

Correct identification of circuit and protective devices (514.8.1;514.9.1)

1.11

1.12

Adequacy of protective devices; type and rated current for fault protection (411.3)

Manual operation of circuit-breakers and RCDs to prove disconnection (612.13.2)

1.13 Operation of integral test button / switch causes RCD(s) to trip (functional check) (612.13.1)

1.14

1.15

1.16

RCD(s) provided for fault protection – includes RCBOs (411.4.9; 411.5.2; 531.2)

RCD(s) provided for protection against fire (422.3.9; 705.422.7)

Presence of RCD retest notice at or near distribution board where required (514.12.2)

1.17 Presence of circuit schedule at or near distribution board where required (514.9.1)

1.18

1.19

Non-standard (mixed) cable colour warning notice provided at or near distribution board where required (514.14)Alternative supply warning notice placed at or near distribution board where required (514.15)

1.20 Next inspection recommendation label provided (514.12.1)

1.21

1.22

1.23

Presence of other required labelling (Please specify) Section 514Examination of protective device(s) and base(s); correct type and rating (no signs of unacceptable thermal damage, arcing and overheating) (411.3.2; 411.4.,5.,6; Section 432; 433)

Single-pole switching or protective devices in line conductors only (132.14.1, 530.3.2)

1.24 Protection against mechanical damage where cables enter distribution board (522.8.1; 522.8.11)

1.25 Protection against electromagnetic effects where cables enter ferromagnetic enclosures(521.5.1)



Outcomes

NAPIT Distribution Board Inspection Schedule Industrial/Commercial

Inspector’s Name

DateSignature

DB ref. DB Location

Outcome

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NA/EIC

Sheet 1 of 3 NA/DB/CF/001 (V3)

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This form is based on the requirements of Appendix 6 of BS 7671NAPIT Administration Centre, 4th Floor, Mill 3, Pleasley Vale Business Park, Mansfield, Nottinghamshire NG19 8RL Sheet 2 of 3 NA/DB/CF/001(V3)


for all socket-outlets of rating 20 A or less provided for use unless exempt (411.3.3)

for cables concealed in walls / partitions containing metal parts regardless of depth (522.6.203)

Provision of fire barriers, sealing arrangements and protection against thermal effects (527)

Band II Cables segregated / separated from Band I cables (528.1)

Cables segregated / separated from non-electrical services (528.3)

Termination of cables at enclosures – identify numbers and locations of items inspected in Section D (526)

Connections under no undue strain (526.6)

No basic insulation of a conductor visible outside enclosure (526.8)

Connections of live conductors adequately enclosed (526.5)

Adequately connected at point of entry to enclosure (glands, bushes etc...) (522.8.5)

Outcomes

Inspector’s Name

Date

Signature

DB LocationDB ref.

Wiring system(s) appropriate for the type and nature of the installation and external influences (Section 522)

Condition of accessories including socket-outlets, switches and joint boxes (621.2 (iii )

Suitability of accessories for external influences (521.2)

Provision of additional protection by 30mA RCD used to supply mobile equipment not exceeding 32 A rating foruse outdoors (411.3.3)

Outcome

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Cables concealed under floors, above ceilings, in wall/partitions, adequately protected against damage(522.6.201; 522.6.203)Concealed cables installed in prescribed zones (see extent and limitations) (522.6.202)Cables incorporating earthed armour or sheath, or run within earthed wiring system, or otherwise protected against mechanical damage by nails, screws and the like (see extent and limitations) ( 522.6.202; 522.6.202; 522.6.204) Provision of additional protection by 30mA RCD

for cables concealed in walls at a depth of less than 50mm (522.6.202)

Single-pole switching or protection devices in line conductors only (132.14.1; 530.3.2)

2.0

Condition of insulation of live parts (416.1)

CIRCUITS

Identification of conductors (514.3.1)

Cables correctly supported throughout their run (522.8.5)

Non-sheathed cables protected by enclosure in conduit, ducting or trunking (521.10.1)

Co-ordination between conductors and overload protective devices (433 ; 533.2.1)

Presence and adequacy of circuit protective conductors (411.3.1.1; 543.1)

Adequacy of protective devices; type and rated current for fault protection (411.3)

Examination of cables for signs of unacceptable thermal or mechanical damage / deterioration (421.1; 522.6) Adequacy of cables for current-carrying capacity with regard for the type and nature of installation (Section 523)

Suitability of containment systems for continued use (including flexible conduit) (Section 522) Cables correctly terminated in enclosures(Section 526)

Confermation that ALL conductors connections, including connections to busbars, are correctly located in terminals and are tight and secure. (526.1)

2.17.1

2.17.2

2.17.32.17.4

2.19

2.21.1

2.21.2

2.21.3

2.21.4

2.23

2.17

2.21

2.24

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3

4

5


3.0

3.1

ISOLATION AND SWITCHING

Isolators ( 537.2)

Presence and condition of appropriate devices (537.2.2)

Acceptable location – state if local or remote from equipment in question (537.2.1.5)

Capable of being secured in the OFF position (537.2.1.2)

Correct operation verified (612.13.2)

Clearly identified by position and /or durable marking(s) (537.2.2.6)

Warning label posted in situations where live parts cannot be isolated by the operation of asingle device (514.11.1, 537.2.1.3)

3.2 Switching off for mechanical maintenance ( 537.3)

Presence and condition of appropriate devices (537.3.1.1)

Acceptable location – state if local or remote from equipment in question (537.3.2.4)

Capable of being secured in the OFF position (537.3.2.3)

Correct operation verified (612.13.2)


3.3 Emergency switching / stopping ( 537.4)

Presence and condition of appropriate devices (537.4.1.1)

Readily accessible for operation where danger might occur (537.4.2.5)

Correct operation verified (537.4.2.6)


3.4 Functional switching (537.5)

Presence and condition of appropriate devices

Correct operation verified (537.5.1.3, 537.5.2.2)

4.0 CURRENT-USING EQUIPMENT (PERMANENTLY CONNECTED)

4.1 Condition of equipment in terms of IP rating etc (416.2)

4.2 Equipment does not constitute a fire hazard (Section 421)

4.3 Enclosure not damaged/deteriorated so as to impair safety (621.2 (iii) )

4.4

4.5

Suitability for the environment and external influences (512.2)

Security of fixing (134.1.1)

4.6

4.7

Correct type of lamps fitted

Installed to minimise build-up of heat by use of “fire rated” fittings, insulation displacement box(421.1.2)No signs of overheating to surrounding building fabric (559.5.1)

No signs of overheating to conductors / terminations (526.1)

5.0

5.1

Outcomes

Inspector’s Name

DateSignature

DB LocationDB ref.

SPECIAL LOCATIONS – PART 7s

List special locations present, if any. List the results of particular inspections applied –a separate page is required for each location

Outcome

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This form is based on the requirements of Appendix 6 of BS 7671NAPIT Administration Centre, 4th Floor, Mill 3, Pleasley Vale Business Park, Mansfield, Nottinghamshire NG19 8RL

or similar

3.1.13.1.23.1.33.1.43.1.5

3.1.6

3.2.13.2.23.2.33.2.43.2.5

3.3.13.3.23.3.33.3.4

3.4.13.4.2

4.7.1

4.7.2

4.7.34.7.4

Sheet 3 of 3 NA/DB/CF/001(V3)

Cable entry holes in ceiling above luminaires, sized or sealed so as to restrict the spread of fire List number and location of luminaires inspected. (separate page)Recessed luminaires (downlighters)

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CircuitN

o. Circuit designation

Typeofw

iring

Ref.m

ethod

No.ofpoints

served

Live(mm2)

CPC(mm2) (S)

TypeNo.

BS EN Number Rating

(A) (kA) (mA) r1 rn r2 R1+R2 R2 (M�) (M�) (�) (�)ms ms(�) (�)�

Test instrument serial number(s)Earth faultloop imped.

Insulationresistance

Continuity

RCD

Complete in every case Location ofdistribution board

Distribution boarddesignation

Number of ways

CIRCUIT DETAILS TEST RESULTS

at 5 I�nat I�n

TestButtonoperation

Maximummeasured

Zs

RCD testing

Live /Earth

Live /Live

All circuits to becompleted using

R1R2, or R2, not bothRing final circuits only(measured end to end)

Other

RCDoperating

currentI�n

Maxim

umdisconnectiontime(BS:7671)

BS7671Max.

permittedvalue Zs

Overcurrent protective devicesCircuit conductorscsa

Polarity

This form is based on the requirements of Appendix 6 of BS 7671NAPIT Administration Centre, 4th Floor, Mill 3, Pleasley Vale Business Park, Mansfield, Nottinghamshire NG19 8RL

Insulation resistance(Record lower reading)

Circuit impedence�

Figure8

check

Characteristics at this distribution board

� OperatingZdb At I�n mstimes of

Ipf kA associated at 5 I�n msRCD(if any)

Supply to distributionboard is from

Overcurrent protective device No. of Nominal Vfor the distribution circuit: phases Voltage

Type BS(EN) Rating A

Supply polarity confirmed Phase sequence confirmed

Complete only if the distribution board is not connected directly to the origin of the installationClient Installation address Postcode

Details of circuits and/or installed equipment vulnerable to damage when testingSee attached sheets page(s) of

Tested by: Name (capital letters) Signature

Position Date(s)

Associated RCD(if any): BS (EN)

RCD I�n mANo ofPoles

Requirements for Electrical Installations – BS 7671:2008 incorporating Amendment No.3 2015 [IET Wiring Regulations 17th Edition]

NAPIT Electrical Test Schedule

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capacity B

reaking

and line No.

NA/EIC/CF/001 (V3)

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NAPIT Electrical Test Schedule Continuation Sheet

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Requirements for Electrical Installations – BS 7671:2008 incorporating Amendment No.3, 2015 [IET Wiring Regulations 17th Edition]

CircuitN

o. Circuit designation

Typeofw

iring

Ref.m

ethod

No.ofpoints

served

Live(mm2)

CPC(mm2) (S)

TypeNo.

BS EN Number Rating

(A) (kA) (mA) r1 rn r2 R1+R2 R2 (M�) (M�) (�) (�)ms ms(�) (�)�

CIRCUIT DETAILS TEST RESULTS

at 5 I�nat I�n

TestButtonoperation

Maximummeasured

Zs

RCD testing

Live /Earth

Live /Live

All circuits to becompleted using

R1R2, or R2, not bothRing final circuits only(measured end to end)

Other

RCDoperating

currentI�n

Maxim

umdisconnectiontime(BS:7671)

BS7671Max.

permittedvalue Zs

Overcurrent protective devicesCircuit conductorscsa

Polarity

Insulation resistance(Record lower reading)

Circuit impedence�

Figure8

check

Details of circuits and/or installed equipment vulnerable to damage when testingSee attached sheets page(s) of

Tested by: Name (capital letters) Signature

Position Date(s)

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(Continuation) DB Ref. No.

NA/EIC/CF/001 (V3)

EIC

Amend. 3 MAXIMUM MEASURED EARTH FAULT LOOP IMPEDANCE[ Zs ] (TN Systems) 17th Edition 2008 [2015] at 80% of Tables 41.2, 41.3 and 41.4

P/DeviceRatingAMPS

PROTECTIVE DEVICE TYPE & BS EN NUMBER

BS:88-2 BS:88-3 BS:3036 BS:1361/2 BS:3871 TYPE BS EN 60898BS 61009-1

E bolt & G clip Fuse Sys. C Fuse Fuse 1 2 3 B C D

(*D 5 sec.)

0.4s 5s 0.4s 5s 0.4s 5s 0.4s 5s 0.4/5s 0.4/5s 0.4/5s 0.4/5s 0.4/5s 0.4/3s

2 26.5 35.2 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

3 N/A N/A N/A N/A N/A N/A 12.48 17.60 N/A N/A N/A 11.66 N/A N/A

4 12.5 16.8 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

5 N/A N/A 7.94 11.68 7.28 13.44 7.94 12.44 8.74 4.99 3.50 N/A N/A N/A

6 6.24 9.60 N/A N/A N/A N/A N/A N/A 7.22 4.08 2.91 5.82 2.91 1.45

10 3.72 5.44 N/A N/A N/A N/A N/A N/A 4.37 2.50 1.75 3.49 1.75 0.87

13 N/A N/A N/A N/A N/A N/A 1.83 2.90 N/A N/A N/A N/A N/A N/A

15 N/A N/A N/A N/A 1.94 4.06 2.48 3.8 2.85 1.66 1.16 N/A N/A N/A

16 1.94 3.20 1.84 3.12 N/A N/A N/A N/A 2.66 1.56 1.09 2.18 1.09 0.54

20 1.34 2.24 1.54 2.56 1.34 2.91 1.29 2.13 2.18 1.25 0.87 1.75 0.87 0.44

25 1.03 1.76 N/A N/A N/A N/A N/A N/A 1.75 1.00 0.70 1.39 0.69 0.35

30 N/A N/A N/A N/A 0.83 2.00 0.87 1.39 1.46 0.83 0.58 N/A N/A N/A

32 0.79 1.36 0.73 1.28 N/A N/A N/A N/A 1.37 0.78 0.55 1.10 0.54 0.27

40 N/A 1.04 N/A N/A N/A N/A N/A N/A 1.09 0.62 0.44 0.87 0.44 0.22

45 N/A N/A N/A 0.80 0.45 1.20 N/A 0.72 0.97 0.55 0.39 0.77 0.38 0.19

50 N/A 0.79 N/A N/A N/A N/A N/A N/A 0.87 0.50 0.35 0.69 0.35 0.17

60 N/A N/A N/A N/A 0.31 0.86 N/A 0.53 N/A N/A N/A N/A N/A N/A

63 N/A 0.62 N/A 0.54 N/A N/A N/A N/A 0.69 0.40 0.28 0.55 0.28 0.13

80 N/A 0.44 N/A 0.41 N/A N/A N/A 0.38 0.55 0.31 0.22 0.43 0.22 0.10

100 N/A 0.34 N/A 0.30 0.14 0.40 N/A 0.26 0.44 0.25 0.17 0.34 0.17 0.07

125 N/A 0.26 N/A N/A N/A N/A N/A N/A N/A N/A N/A 0.27 0.13 0.06

160 N/A 0.21 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

200 N/A 0.14 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

250 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

*For BS EN 60898 / 61009 Type ‘D’ 5 Sec. Please use Type ‘C’ ColumnNAPIT Group 2008 (2 Document No NA/TDZD2a

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Table 7.1 (ii) Installation referance methods and cable ratings for 70 °CThermoplastic (PVC) insulated and sheathed fl at cable with protective conductor

Ref. Description Installation reference method

Conductor cross-sectional area (mm2)

1.0mm2 1.5mm2 2.5mm2 4mm2 6mm2 10mm2 16mm2

C Clipped direct 16A 20A 27A 37A 47A 64A 85A

B* Enclosed in conduit or trunking on a wall etc, 13A 16.5A 23A 30A 38A 52A 69A

102In the stud wall with thermalinsulation with cable touching the wall

13A 16A 21A 27A 35A 47A 63A

100

In contact with the plasterboard ceiling or joists covered by thermal insulation not exceeding 100 mm

13A 16A 21A 27A 34A 45A 57A

A Enclosed in conduitin an insulated wall 11.5A 14.5A 20A 26A 32A 44A 57A

101

In contact with plasterboard ceiling or joists coveredby thermal insulationexceeding 100mm

10.5A 13A 17A 22A 27A 36A 46A

103

Surrounded by thermal insulation including in a stud wall with thermal insulation with cable not touching a wall

8A 10A 13.5A 17.5A 23.5A 32A 42.5A

Notes :1. Cable ratings taken from Table 4D5 of BS 76712. B* taken from Table 4D2A of BS7671, see Appendix F.

NAPIT Group 2008 (2 Document No NA/TDZD2a

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Reference Sheet - Installation Reference Method Codes

The following table is based around the tables of Appendix 4 of BS 7671:2008 and provides reference method codes appropriate to a given installation type. For further information on these reference methods the BS 7671 should be consulted and should greater clarity be required the IET contacted directly.

Methods of InstallationReference Method A For example, Installation Methods 1 and 2 of Table 4A2, (non-sheathed cables and multi-core cables in conduit in a thermally insulated wall). The wall consists of an outer weatherproof skin, thermal insulation and an inner skin of wood or wood-like material having a thermal conductance of at least 10 W/m².K. The conduit is fixed such that it is close to, but not necessarily touching the inner skin. Heat from the cables is assumed to escape through the inner skin only. The conduit can be of metal or plastic.

Reference Method B For example, Installation Method 4 of Table 4A2, (non-sheathed or sheathed cables in conduit mounted on a wooden or masonry wall) and B2, item Installation Method 5 of Table 4A2, (multi-core cable in conduit on a wooden wall). The conduit is mounted on a wooden wall such that the gap between the conduit and the surface is less than 0.3 times the conduit diameter. The conduit can be metal or plastic. Where the conduit is fixed to a masonry wall the current-carrying capacity of the non-sheathed or sheathed cable may be higher.

Reference Method C For example, Installation Method 20 of Table 4A2 (single-core or multi-core cable on a wooden wall). Cable mounted on a wooden wall so that the gap between the cable and the surface is less than 0.3 times the cable diameter. Where the cable is fixed to or embedded in a masonry wall the current-carrying capacity may be higher. NOTE: The term 'masonry' is taken to include brickwork, concrete, plaster and similar (but excluding thermally insulating materials).

Reference Method D For example Installation Method 70 of Table 4A2, (multi-core un-armoured cable in conduit or in ducts in the ground). The cable is drawn into a 100mm diameter plastic, earthenware or metallic ducts laid in direct contact with soil having a thermal resistivity of 2.5 K.m/W and at a depth of 0.8 m. The values given for this method are those stated in this Part of BS 7671 and are based on conservative installation parameters. If the specific installation parameters are known, (thermal resistance of the ground, ground ambient temperature, cable depth), reference can be made to the cable manufacturer or the ERA 69-30 series of publications, which may result in a smaller cable size being selected. NOTE: The current-carrying capacity for cables laid in direct contact with soil having a thermal resistivity of 2.5 K.m/W and at a depth of 0.7 m is approximately 10 % higher than the values tabulated for Reference method D.

Reference Methods E, F and G For example, Installation Methods 31 to 35 of Table 4A, (single-core or multi-core cable in free air). The cable is supported such that the total heat dissipation is not impeded. Heating due to solar radiation and other sources is to be taken into account. Care is to be taken that natural air convection is not impeded. In practice a clearance between a cable and any adjacent surface of at least 0.3 times the cable external diameter for multi-core cables or 1.0 times the cable diameter for single-core cables is sufficient to permit the use of current-carrying capacities appropriate to free air conditions.

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DescriptionNumber of

cores Reference Method

Enclosed in conduit in thermally insulating wall Any A

Enclosed in conduit or trunking on a wall Any B

Clipped direct Any C

Direct in ground or in ducting in ground, in or around buildings Any E

In free air or on perforated cable tray Multi-core E

In free air or on perforated cable tray Single-core F or G

4D5 (Twin & Earth) cable above a plasterboard ceiling covered by thermal insulation not exceeding 100mm in Twin & Earth 100

4D5 (Twin & Earth) cable above a plasterboard ceiling covered by thermal insulation exceeding 100mm in Twin & Earth 101

4D5 (Twin & Earth) cable in a stud wall with thermal insulation with cable touching the inner wall surface Twin & Earth 102

4D5 (Twin & Earth) cable in a stud wall with thermal insulation with cable not touching the inner wall surface Twin & Earth 103

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