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Protective earthing conductorFrom Electrical Installation Guide

&ump to' naigation( search

)cope and content o" *i#i EI+

+eneral rules o" electrical installationdesign

!onnection to the M, utility

distribution networ#

!onnection to the L, utilitydistribution networ#

M, - L, architecture selectionguide

L, Distribution

Protection against electric shoc#s

)i.ing and protection o" conductors

!onductor si.ing andprotection

o Methodology and

de"inition

o $ercurrent

protection principles

o Practical alues "or a

protectie scheme

o Location o"

protectie deices

o !onductors in

parallel Practical method "or

determining the smallest

allowable crosssectionalarea o" circuit conductors

o +eneral method "or

cable si.ing

o %ecommended

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changes

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*hat lin#s

here %elated

changes

)pecial

pages

Printable

ersion

Permanent

lin#

Main

contributors

!ite this

page

simpli"ied approach"or cable si.ing

o 0usbar trun#ing

systems

Determination o" oltage

dropo Maximum oltage

drop

o !alculation o"

oltage drop insteady load

conditions

)hortcircuit current

o )hortcircuit current

at the secondary

terminals o" a

M,/L, distributiontrans"ormer

o 1phase shortcircuit

current 2Isc3 at any

point within a L,installation

o Isc at the receiing

end o" a "eeder as a

"unction o" the Isc atits sending end

Particular cases o" short

circuit current

o !alculation o"minimum leels o"

shortcircuit current

o ,eri"ication o" the

withstand capabilities

o" cables under shortcircuit conditions

Protectie earthing conductor

o !onnection and

choice "or protectie

earthing conductor

o

)i.ing o" protectieearthing conductor

o Protectie conductor

between M,/L,trans"ormer and the

main generaldistribution board

2M+D03

http://www.electrical-installation.org/wiki/Special:RecentChangeshttp://www.electrical-installation.org/wiki/Special:WhatLinksHere/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:WhatLinksHere/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:RecentChangesLinked/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:RecentChangesLinked/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:SpecialPageshttp://www.electrical-installation.org/wiki/Special:SpecialPageshttp://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&printable=yeshttp://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&printable=yeshttp://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&oldid=6610http://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&oldid=6610http://www.electrical-installation.org/w/index.php?title=Special:Contributors&target=Protective_earthing_conductorhttp://www.electrical-installation.org/w/index.php?title=Special:Contributors&target=Protective_earthing_conductorhttp://www.electrical-installation.org/w/index.php?title=Special:Cite&page=Protective_earthing_conductor&id=6610http://www.electrical-installation.org/w/index.php?title=Special:Cite&page=Protective_earthing_conductor&id=6610http://www.electrical-installation.org/wiki/Recommended_simplified_approach_for_cable_sizinghttp://www.electrical-installation.org/wiki/Recommended_simplified_approach_for_cable_sizinghttp://www.electrical-installation.org/wiki/Recommended_simplified_approach_for_cable_sizinghttp://www.electrical-installation.org/wiki/Busbar_trunking_systemshttp://www.electrical-installation.org/wiki/Busbar_trunking_systemshttp://www.electrical-installation.org/wiki/Determination_of_voltage_drophttp://www.electrical-installation.org/wiki/Determination_of_voltage_drophttp://www.electrical-installation.org/wiki/Maximum_voltage_drophttp://www.electrical-installation.org/wiki/Maximum_voltage_drophttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Calculation_of_minimum_levels_of_short-circuit_currenthttp://www.electrical-installation.org/wiki/Calculation_of_minimum_levels_of_short-circuit_currenthttp://www.electrical-installation.org/wiki/Calculation_of_minimum_levels_of_short-circuit_currenthttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Connection_and_choice_for_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Connection_and_choice_for_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Connection_and_choice_for_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Sizing_of_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Sizing_of_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Special:RecentChangeshttp://www.electrical-installation.org/wiki/Special:WhatLinksHere/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:WhatLinksHere/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:RecentChangesLinked/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:RecentChangesLinked/Protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Special:SpecialPageshttp://www.electrical-installation.org/wiki/Special:SpecialPageshttp://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&printable=yeshttp://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&printable=yeshttp://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&oldid=6610http://www.electrical-installation.org/w/index.php?title=Protective_earthing_conductor&oldid=6610http://www.electrical-installation.org/w/index.php?title=Special:Contributors&target=Protective_earthing_conductorhttp://www.electrical-installation.org/w/index.php?title=Special:Contributors&target=Protective_earthing_conductorhttp://www.electrical-installation.org/w/index.php?title=Special:Cite&page=Protective_earthing_conductor&id=6610http://www.electrical-installation.org/w/index.php?title=Special:Cite&page=Protective_earthing_conductor&id=6610http://www.electrical-installation.org/wiki/Recommended_simplified_approach_for_cable_sizinghttp://www.electrical-installation.org/wiki/Recommended_simplified_approach_for_cable_sizinghttp://www.electrical-installation.org/wiki/Busbar_trunking_systemshttp://www.electrical-installation.org/wiki/Busbar_trunking_systemshttp://www.electrical-installation.org/wiki/Determination_of_voltage_drophttp://www.electrical-installation.org/wiki/Determination_of_voltage_drophttp://www.electrical-installation.org/wiki/Maximum_voltage_drophttp://www.electrical-installation.org/wiki/Maximum_voltage_drophttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Calculation_of_voltage_drop_in_steady_load_conditionshttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/Short-circuit_current_at_the_secondary_terminals_of_a_MV/LV_distribution_transformerhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/3-phase_short-circuit_current_(Isc)_at_any_point_within_a_LV_installationhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Isc_at_the_receiving_end_of_a_feeder_as_a_function_of_the_Isc_at_its_sending_endhttp://www.electrical-installation.org/wiki/Calculation_of_minimum_levels_of_short-circuit_currenthttp://www.electrical-installation.org/wiki/Calculation_of_minimum_levels_of_short-circuit_currenthttp://www.electrical-installation.org/wiki/Calculation_of_minimum_levels_of_short-circuit_currenthttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Verification_of_the_withstand_capabilities_of_cables_under_short-circuit_conditionshttp://www.electrical-installation.org/wiki/Connection_and_choice_for_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Connection_and_choice_for_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Connection_and_choice_for_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Sizing_of_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Sizing_of_protective_earthing_conductorhttp://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)http://www.electrical-installation.org/wiki/Protective_conductor_between_MV/LV_transformer_and_the_main_general_distribution_board_(MGDB)

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o E4uipotential

conductor

5he neutral conductor

o )i.ing the neutral

conductor

o Protection o" theneutral conductor

o 0rea#ing o" the

neutral conductor

o Isolation o" the

neutral conductor

*or#ed example o" cable

calculation

L, switchgear' "unctions - selection

Protection against oltage surges inL,

Energy E""iciency in electrical

distribution

Power "actor correction and

harmonic "iltering

Power harmonics management

!haracteristics o" particular sources

and loads

Photo,oltaic 2P,3 installation

%esidential electrical installations

ElectroMagnetic !ompatibility

2EM!3

Contents

6hide7

8 !onnection and choice

o 898 !onnection

o 89: 5ypes o" materialso 891 !onductor si.ing

: Protectie conductor

between M,/L, trans"ormer

and the main generaldistribution board 2M+D03

1 E4uipotential conductor

o 198 5he main

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e4uipotential conductor

o 19: )upplementary

e4uipotential conductor

[editConnection and choice

Protectie 2PE3 conductors proide the bonding connection between all exposed

installation( to create the main e4uipotential bonding system9 5hese conductors c2between a phase conductor and an exposed conductie part3 to the earthed neut

to the main earthing terminal o" the installation9

5he main earthing terminal is connected to the earthing electrode 2see !hapter E

electrode conductor in the ;)A39PE conductors must be'

Insulated and coloured yellow and green 2stripes3 Protected against mechanical and chemical damage

In I5 and 5Nearthed schemes it is strongly recommended that PE conductors sh

the same conduits( on the same cable tray( etc93 as the lie cables o" the related cminimum possible inductie reactance in the earth"ault current carrying circuits

It should be noted that this arrangement is originally proided by bustrun#ing9

[edit Connection

PE conductors must'

Not include any means o" brea#ing the continuity o" the circuit 2such as

!onnect exposed conductie parts indiidually to the main PE conductor

Figure G!"

Hae an indiidual terminal on common earthing bars in distribution boa

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Fig. G54:A poor connection in a series arrangement will leave all downstream

TT scheme

5he PE conductor need not necessarily be installed in close proximity to the liesince high alues o" earth"ault current are not needed to operate the %!Dtype o

IT and TN schemes

5he PE or PEN conductor( as preiously noted( must be installed as close as pos

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the circuit and no "erromagnetic material must be interposed between them9 A P

directly to the earth terminal o" an appliance( with a looped connection "rom the

appliance 2see Fig# G!!39

5N! scheme 2the neutral and PE conductor are one and the same( re"err

5he protectie "unction o" a PEN conductor has priority( so that all rules goerniconductors

5N! to 5N) transition

5he PE conductor "or the installation is connected to the PEN terminal or bar 2se

installation9 Downstream o" the point o" separation( no PE conductor can be con

Fig. G55:Direct connection of the PEN conductor to the earth terminal of an ap

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Fig. G56:The TN-C-S scheme

[edit T$%es o& materials

Materials o" the #inds mentioned below in Figure G!' can be used "or PE cond

mentioned in the last column are satis"ied9

T$%e o& %rotective earthing

conductor(PE)

IT scheme TN scheme TT sc

)upplementary In the same cable

asconductor the phases(or in the

same cable run

)trongly

recommended

)trongly

recommended

!orre

Independent o" the

phase conductors

Possible283 Possible2832:3 !orre

Metallic housing o" bustrun#ing or o"

other pre"abricated prewired ducting2=3

Possible213 PE possible 213

PEN possible 2?3

!orre

External sheath o" extruded( mineral

insulated

conductors 2e9g9 @pyrotenax typesystems3

Possible213 PE possible 213

PEN not

recommended 2:3213

Possib

!ertain extraneous conductie

elements2>3

such as'

)teel building structure

Machine "rames

*ater pipes2B3

Possible2C3 PE possible2C3

PEN "orbidden

Possib

Metallic cable ways( such as(

conduits23(

ducts( trun#ing( trays( ladders( and so

on

Possible2C3 PE possible2C3

PEN not

recommended 2:32C3

Possib

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loop9

2:3 5he PEN conductor is a neutral conductor that is also used as a protectie ea

be "lowing through it at any time 2in the absence o" an earth "ault39 3 5hese elements must be demountable only i" other means hae been proide

protection9

2B3 *ith the agreement o" the appropriate water authorities92?3 In the pre"abricated prewired trun#ing and similar elements( the metallic hou

parallel with the corresponding bar( or other PE conductor in the housing9

23

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283 Data alid i" the prospectie conductor is o" the same material as the line con

be applied9

2:3 *hen the PE conductor is separated "rom the circuit phase conductors( the "o

:9= mm:

i" the PE is mechanically protected C mm:i" the PE is not mechanically protected

213 mm:)PE )ph

8> )ph 1= mm:)PE 8> mm:

)ph J 1= mm:

Note' when( in a 55 scheme( the installation earth electrode is beyond the .one o

the c9s9a9 o" the PE conductor can be limited to := mm:2"or copper3 or 1= mm:25he neutral cannot be used as a PEN conductor unless its c9s9a9 is e4ual to or lar

2aluminium39

Moreoer( a PEN conductor is not allowed in a "lexible cable9 )ince a PEN condits c9s9a9 cannot( in any case( be less than that necessary "or the neutral9

5his c9s9a9 cannot be less than that o" the phase conductors unless'

5he #,A rating o" singlephase loads is less than 8G o" the total #,A l

Imax li#ely to pass through the neutral in normal circumstances( is less th

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cable si.e9

!onductors o" a multicorecable

!opper 88= 8

Aluminium B>

! factor values for "# PE conductors$ commonl% used in national standards and c

[edit Protective conductor between -V64V trans&ormer and the main gene

5hese conductors must be si.ed according to national practices

All phase and neutral conductors upstream o" the main incoming circuitbrea#erprotected by deices at the M, side o" the trans"ormer9 5he conductors in 4uest

dimensioned accordingly9 Dimensioning o" the phase and neutral conductors "ro

!8 o" the system illustrated in Fig# G9!39%ecommended conductor si.es "or bare and insulated PE conductors "rom the tra

G9:( are indicated below in Figure G9.9

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5he #,A rating to consider is the sum o" all 2i" more than one3 trans"ormers con

Fig. G60:PE conductor to the main earth ,ar in the D.

5he table indicates the c9s9a9 o" the conductors in mm: according to'

5he nominal rating o" the M,/L, trans"ormer2s3 in #,A

5he "aultcurrent clearance time by the M, protectie deices( in second

5he #inds o" insulation and conductor materials

I" the M, protection is by "uses( then use the G9: seconds columns9

In I5 schemes( i" an oeroltage protection deice is installed 2between the transconductors "or connection o" the deice should also be dimensioned in the same

PE conductors9

Trans&ormer

rating in 0V/

Conductor material 8are conductors PVC2insulated c

Co%%er t(s) :#, :#! 2 :#, :#!

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(,;:6":: V out%ut)/luminium t(s) 2 :#, :#! 2 :#,

8GG c9s9a9 o" PE

conductors)PE 2mm:3

:= := := := :=

8>G := := 1= := :=

:GG := 1= =G := 1=

:=G := 1= BG 1= =G

18= 1= =G BG 1= =G

CGG =G BG = =G BG

=GG =G BG 8:G BG =

>1G BG = 8=G BG =

?GG BG 8:G 8=G = 8:G

8(GGG = 8:G 8?= = 8:G

8(:=G = 8=G 8?= 8:G 8=G

Fig. G61:/ecommended c0s0a0 of PE conductor ,etween the #1"# transforme

ratings and fault-clearance times0

[edit EG1>CCC839

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Fig. G62:Supplementar% e2uipotential conductors

%etrieed "rom http'//www9electricalinstallation9org/wi#i/ProtectieQearthingQ

5his page was last modi"ied on ? March :G8G( at 8B'=G9

5his page has been accessed (>== times9

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