Amendment 1 - Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors

Amendement 1 - Installations électriques à basse tension - Partie 5-54: Choix et mise en oeuvre des matériels électriques - Installations de mise à la terre et conducteurs de protection

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IEC 60364-5-54
Edition 3.0 2021-04
Low-voltage electrical installations –
Part 5-54: Selection and erection of electrical equipment – Earthing
arrangements and protective conductors
Installations électriques à basse tension –
Partie 5-54: Choix et mise en œuvre des matériels électriques – Installations
de mise à la terre et conducteurs de protection
IEC 60364-5-54:2011-03/AMD1:2021-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60364-5-54
Edition 3.0 2021-04
Low-voltage electrical installations –
Part 5-54: Selection and erection of electrical equipment – Earthing
arrangements and protective conductors
Installations électriques à basse tension –
Partie 5-54: Choix et mise en œuvre des matériels électriques – Installations
de mise à la terre et conducteurs de protection
ICS 29.020; 91.140.50 ISBN 978-2-8322-9591-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60364-5-54:2011/AMD1:2021
© IEC 2021
Part 5-54: Selection and erection of electrical equipment –
Earthing arrangements and protective conductors

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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Amendment 1 to IEC 60364-5-54:2011 has been prepared by IEC technical committee 64:

Electrical installations and protection against electric shock.
The text of this Amendment is based on the following documents:
Draft Report on voting
64/2479/FDIS 64/2481/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this Amendment is English.
---------------------- Page: 4 ----------------------
IEC 60364-5-54:2011/AMD1:2021 – 3 –
© IEC 2021

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,

available at The main document types developed by

IEC are described in greater detail at

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION to Amendment 1
The main changes provided in this Amendment 1 are:

• clarification and necessary modifications to define a clear borderline between functional

earthing and protective earthing (see INTRODUCTION);

• introduction of additional requirements for functional earthing and functional-equipotential-

bonding for information technology systems and communication equipment (ICT).
Add the following new text at the end of the existing paragraph:

To define a clear borderline between functional earthing and protective earthing the following

explanations are given:
Functional earthing
• Functional earthing

If any connection of the functional earthing is interrupted, it does not impair any kind of

protection or any kind of protective measure or protective provision provided for electrical

safety. Therefore, its application mainly relates to:
– communication,
– measurement, and

– EMC as regards radiated disturbances and conducted high frequency disturbances.

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– 4 – IEC 60364-5-54:2011/AMD1:2021
© IEC 2021
• Protective earthing

If any connection of the protective earthing is interrupted, it impairs the protection or the

function of a protective measure or protective provision provided for electrical safety.

Requirement for protective earthing are given in:
– IEC 60364-4-41 for protection against electric shock;
– IEC 60364-4-42 for protection against thermal effects;
– IEC 60364-4-44 for protection against conducted disturbances.
541.1 Scope
Add the following new text at the end of the existing paragraph:

This document also includes requirements regarding earthing and equipotential bonding for

information and communication technology (ICT) with the aim of:

– reducing the risk of electrical hazards for correct operation of these devices and the

information and communication technology wiring;

– providing the telecommunication systems with a reliable signal reference plane that can

improve resistance to electromagnetic interference (EMI) by reference to ISO/IEC 30129.

NOTE Examples of information and communication technology (ICT) include:

– DC supply networks (and systems) for supplying power to ICT equipment within a building;

– star-shaped private automatic branch exchanges (PABX) or their equipment;
– local area (communication) networks (LANs);
– fire and intruder alarms communication systems;
– building automation systems, e.g. direct digital control systems;

– systems for computer-aided manufacturing (CAM) and other computer-aided services;

– broadcast and communication technology.
541.2 Normative references
Add the following new references:

IEC 60445, Basic and safety principles for man-machine interface, marking and identification

– Identification of equipment terminals, conductor terminations and conductors

IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-

Replace the existing reference to IEC 62305-3:2006 with the following new reference:

IEC 62305-3:2010, Protection against lightning – Part 3: Physical damage to structures and

life hazard
541.3 Terms and definitions
Add the following new definitions:
functional earthing conductor
conductor provided for functional earthing

[SOURCE: IEC 60050-826:2004, 826-13-28, modified – In the definition, "earthing conductor"

replaced with "conductor".]
---------------------- Page: 6 ----------------------
IEC 60364-5-54:2011/AMD1:2021 – 5 –
© IEC 2021
main functional earthing terminal
main functional earthing busbar

terminal or busbar, which is part of the functional earthing arrangement of an electrical

installation, enabling the electric connection of a number of conductors for functional earthing

equipotential bonding for reasons other than electrical safety

[SOURCE: IEC 60050-826:2004, 826-13-21, modified – "operational reasons other than

safety" replaced with "reasons other than electrical safety".]
equipotential bonding for the purposes of electrical safety
[SOURCE: IEC 60050-826:2004, 826-13-20, modified – "electrical" added.]
equipotential bonding
provision of electric connections between conductive parts, intended to achieve
[SOURCE: IEC 60050-826:2004, 826-13-19]
protective earthing
earthing for purposes of electrical safety

[SOURCE: IEC 60050-826:2004, 826-13-09, modified – "a point or points in a system or in an

installation or in equipment" deleted.]
functional bonding conductor
conductor provided for functional-equipotential-bonding
[SOURCE: IEC 60050-826:2004, 826-13-29]
542 Earthing arrangements
542.1 General requirements
Delete the note.
542.2 Earth electrodes
Replace, after NOTE 2, the sentence:
"If a lightning protection system is required, 5.4 of IEC 62305-3:2006 applies."
---------------------- Page: 7 ----------------------
– 6 – IEC 60364-5-54:2011/AMD1:2021
© IEC 2021
with the following new sentence:

"Where a lightning protection system is required, IEC 62305-3:2010, 5.4 also applies."


Replace the second sentence starting with "One or more earth electrodes..." with the following

new sentence:

"Earth electrode(s) shall be selected according to the soil conditions and the required value of

resistance to earth."
543 Protective conductors
543.2 Types of protective conductors

Replace the first sentence starting with "The following metal parts..." with the following new

"The following metal parts shall not be used as protective conductors:"
Renumber the existing NOTE 1 as NOTE and delete NOTE 2.
543.3 Electrical continuity of protective conductors
Replace the text:

"Joints in protective conductors shall be accessible for inspection and testing except for"

with the following new text:
"Joints in protective conductors shall be accessible except for"
Replace the second dashed item:
"– encapsulated joints,"
with the following:
"– connections within enclosures which can be opened only by destruction,"
Replace the fourth dashed item with the following:

"– joints forming part of equipment, complying with the relevant standards, for example low-

voltage switchgear and controlgear assemblies according to 543.2.2,"
Add, at the end of Clause 544, the following new Clause 545
---------------------- Page: 8 ----------------------
IEC 60364-5-54:2011/AMD1:2021 – 7 –
© IEC 2021
545 Functional earthing and functional-equipotential-bonding for Information
and communication technology equipment and systems (ICT)
545.1 Functional-equipotential-bonding for ICT
545.1.1 General
A functional-equipotential-bonding system may comprise
– functional earthing conductor(s),
– functional bonding conductor(s),
– a main functional earthing terminal.

Where the functional-equipotential-bonding system is not locally connected to the protective-

equipotential-bonding system, the functional bonding conductors shall be
– insulated, and
– installed separately from the protective conductor, and
– connected to the main earthing terminal only once.

NOTE The functional-bonding-conductors are insulated because those conductors could under certain

circumstances achieve a dangerous potential.

If there are multiple functional bonding conductors present in the electrical installation, a

separate main functional earthing terminal (MFET) shall be installed for ease of connection for

these conductors. The main functional earthing terminal shall be connected to the main

earthing terminal only once.

The cross-sectional area of every functional bonding conductor or functional earthing

conductor shall be capable of withstanding all mechanical and thermal stresses caused by the

expected operational current. This current shall be determined in accordance with the

manufacturer's instructions or by measurement taking into account the ICT equipment or

545.1.2 Minimum cross-sectional area

In the absence of requirements, for example stated by the equipment manufacturer, the

following minimum cross-sectional area shall be applied for functional earthing conductors

and functional bonding conductors:
2 2
– 2,5 mm Cu or 16 mm Al, if protection against mechanical damage is provided,
2 2
– 4 mm Cu or 16 mm Al, if protection against mechanical damage is not provided.
NOTE Larger cross-sectional areas can be specified for EMC reasons.
545.1.3 Identification
A functional earthing conductor shall be identified according to IEC 60445 by:
– the alphanumeric notation FE, or

– by the colour PINK at least applied at the terminations and points of connection, or

– by the symbol (graphical symbol IEC 60417-5018:2011-07).
A functional bonding conductor shall be identified by:
– the alphanumeric notation FB, or
– by the symbol (graphical symbol IEC 60417-5020:2002-10).

NOTE The alphanumeric notation and the colour marking are in accordance with IEC 60445.

---------------------- Page: 9 ----------------------
– 8 – IEC 60364-5-54:2011/AMD1:2021
© IEC 2021

The bi-colour combination GREEN-AND-YELLOW shall not be used to identify functional

bonding conductors.
545.1.4 Electrical continuity of functional bonding conductors

The requirements of 543.3, except for 543.3.5, also apply for functional bonding.

If part of an item of equipment can be removed, the functional bonding conductor for the

remaining part of the electrical installation shall not be disconnected.
545.1.5 Combined protective and functional bonding conductors

Where a combined protective and functional bonding conductor is used, it shall fulfil all

requirements for a protective bonding conductor. The combined protective and functional

bonding conductor shall be identified by the bi-colour combination GREEN-AND-YELLOW.

545.2 Main functional earthing terminal (MFET)

The following conductors shall be connected to the main functional earthing terminal (MFET),

if any:
– functional earthing conductors;
– functional bonding conductors.

The main functional earthing terminal (MFET) and the main earthing terminal (MET) may be

combined, as stated in 542.4.
545.3 Equipotential bonding ring conductors

The main earthing terminal (MET according to 542.4 and/or MFET according to 548.2) may be

provided as a ring (closed loop) conductor to enable systems of information technology and

communications equipment (ICT) to be incorporated into the equipotential bonding system

using the shortest connection.

The equipotential bonding ring conductor shall be easily accessible wherever connections

may be required.

The cross-sectional area of equipotential bonding ring conductors shall comply either with

Clause 544 when used also for protective bonding, or:
– be at least 50 mm hot-dip galvanized steel strip, or
copper, or
– be at least 16 mm

– be a cross-sectional area in another material, which provides at least a conductivity

equivalent to 16 mm copper.
---------------------- Page: 10 ----------------------
IEC 60364-5-54:2011/AMD1:2021 – 9 –
© IEC 2021
Annex B
Figure B.54.1

Replace the existing figure including the key to the figure with the following new Figure B.54.1

and key:
---------------------- Page: 11 ----------------------
– 10 – IEC 60364-5-54:2011/AMD1:2021
© IEC 2021
Symbol Name Remark
C Extraneous-conductive-part
C1 Water pipe, metal from outside Or district heating pipe
C2 Waste water pipe, metal from outside
C3 Gas pipe with insulating insert, metal from outside
C4 Air-conditioning
C5 Heating system

C6 Water pipe, metal e.g. in an area where supplementary See IEC 60364-7-701:2006, 701.415.2

equipotential bonding is required

C7 Waste water pipe, metal e.g. in an area where See IEC 60364-7-701:2006, 701.415.2

supplementary equipotential bonding is required
D Insulating insert
MDB Main distribution board
DB Distribution board Supplied from the main distribution
MET Main earthing terminal See 542.4
SEBT Supplementary equipotential bonding terminal
T1 Concrete-embedded foundation earth electrode or soil- See 542.2
embedded foundation earth electrode
T2 Earth electrode for LPS if necessary See 542.2
LPS Lightning protection system (if any)
PE PE terminal(s) in the distribution board
PE/PEN PE/PEN terminal(s) in the main distribution board
M Exposed-conductive-part
1 Protective earthing conductor (PE) See Clause 543
Cross-sectional area see 543.1
Type of protective conductor see 543.2
Electrical continuity see 543.3
1a Protective conductor, or PEN conductor, if any, from
supplying network
2 Protective bonding conductor for connection to the main See 544.1
earthing terminal
3 Protective bonding conductor for supplementary bonding See 544.2
4 Down conductor of a lightning protection system (LPS) if any
5 Earthing conductor See 542.3

Where a lightning protection system is installed, the additional requirements are given in IEC 62305-3:2010,

Clause 6, in particular those given in 6.1 and 6.2.
NOTE Functional earthing conductors are not shown in Figure B.54.1.

Figure B.54.1 – Examples of earthing arrangements for foundation earth electrode,

protective conductors and protective bonding conductors
---------------------- Page: 12 ----------------------
IEC 60364-5-54:2011/AMD1:2021 – 11 –
© IEC 2021
Annex E
Insert, between the column headers and first row, the following new row:

US 541.1 In the USA, there are specific In the USA, requirements specific for earthing

requirements in NFPA 70 (grounding) arrangements, and related protective
applicable to earthing conductors are contained in NFPA 70, National
(grounding). Electrical Code.
Add the following new references:

IEC 60364-4-42, Low-voltage electrical installations – Part 4-42: Protection for safety –

Protection against thermal effects

ISO/IEC 30129, Information technology – Telecommunications bonding networks for buildings

and other structures
---------------------- Page: 13 ----------------------
– 12 – IEC 60364-5-54:2011/AMD1:2021
© IEC 2021
Partie 5-54: Choix et mise en œuvre des matériels électriques –
Installations de mise à la terre et conducteurs de protection

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L’amendement 1 à l’IEC 60364-5-54:2011 a été établi par le comité d’études 64 de l’IEC:

Installations électriques et protection contre les chocs électriques.
Le texte de cet amendement est issu des documents suivants:
Projet Rapport de vote
64/2479/FDIS 64/2481/RVD

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant

abouti à son approbation.
---------------------- Page: 14 ----------------------
IEC 60364-5-54:2011/AMD1:2021 – 13 –
© IEC 2021
La langue employée pour l’élaboration de cet amendement est l’anglais.
Le présent document a

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