Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors (IEC 60445:2010)

This International Standard applies to the identification and marking of terminals of electrical equipment such as resistors, fuses, relays, contactors, transformers, rotating machines and, wherever applicable, to combinations of such equipment (e.g. assemblies), and also applies to the identification of terminations of certain designated conductors. It also provides general rules for the use of certain colours or alphanumeric notations to identify conductors with the aim of avoiding ambiguity and ensuring safe operation. These conductor colours or alphanumeric notations are intended to be applied in cables or cores, busbars, electrical equipment and installations.

Grund und Sicherheitsregeln für die Mensch-Maschine-Schnittstelle - Kennzeichnung von Anschlüssen elektrischer Betriebsmittel, angeschlossenen Leiterenden und Leitern (IEC 60445:2010)

Principes fondamentaux et de sécurité pour les interfaces homme-machines, le marquage et l'identification - Identification des bornes de matériels, des extrémités de conducteurs et des conducteurs (CEI 60445:2010)

La CEI 60445:2010 s'applique à l'identification et au marquage des bornes de matériels électriques, tels que résistances, coupe-circuits à fusibles, relais, contacteurs, transformateurs, machines tournantes et, chaque fois que cela est possible, à des combinaisons de tels matériels (par exemple des ensembles) et s'applique aussi à l'identification des extrémités de certains conducteurs désignés. Elle prévoit également des règles générales concernant l'utilisation de certaines couleurs ou de certains caractères alphanumériques pour identifier les conducteurs dans le but d'éviter toute ambiguïté et de garantir la sécurité de fonctionnement. Ces couleurs ou ces caractères alphanumériques destinés aux conducteurs doivent être appliqués aux câbles ou aux noyaux, aux barres omnibus, aux matériels et aux installations électriques. Cette cinquième édition qui fusionne la CEI 60445 et la CEI 60446, annule et remplace la quatrième édition de la CEI 60445, publiée en 2006, et la quatrième édition de la CEI 60446, publiée en 2007. Elle a le statut d'une publication fondamentale de sécurité, conformément au Guide 104 de la CEI. Cette édition inclut les modifications techniques importantes suivantes par rapport à l'édition précédente:  - l'adjonction de nouvelles définitions à l'Article 3;  - la révision de certains articles afin d'utiliser la terminologie des normes CEI de référence. Ces révisions ne modifient aucune exigence technique, mais en clarifient la formulation;  - l'adjonction de l'Annexe B (informative) 'Liste des notes concernant certains pays'.

Osnovna in varnostna načela za vmesnik človek-stroj, označevanje in razpoznavanje - Razpoznavanje terminalov opreme, končnikov vodnikov in vodnikov (IEC 60445:2010)

Ta mednarodni standard velja za identifikacijo in označevanje terminalov električne opreme, kot so upori, varovalke, releji, vtikala, transformatorji, rotacijski stroji in, če je primerno, za kombinacije te opreme (npr. sklope); velja tudi za razpoznavanje končnikov določenih vodnikov. Prav tako zagotavlja splošna pravila za uporabo določenih barv ali alfanumeričnih oznak za razpoznavanje vodnikov s ciljem izogniti se nejasnosti in zagotoviti varno delovanje. Te barve vodnikov ali alfanumeričnih oznak so namenjene uporabi v kablih ali sredicah, zbiralkah, električni opremi in inštalacijah.

General Information

Status
Withdrawn
Publication Date
23-Nov-2010
Withdrawal Date
21-Sep-2020
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
22-Sep-2020
Due Date
15-Oct-2020
Completion Date
22-Sep-2020

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SLOVENSKI STANDARD
SIST EN 60445:2011
01-januar-2011
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SIST EN 60445:2008
SIST EN 60446:2007
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Grund und Sicherheitsregeln für die Mensch-Maschine-Schnittstelle - Kennzeichnung

von Anschlüssen elektrischer Betriebsmittel, angeschlossenen Leiterenden und Leitern

(IEC 60445:2010)
Principes fondamentaux et de sécurité pour les interfaces homme-machines, le

marquage et l'identification - Identification des bornes de matériels, des extrémités de

conducteurs et des conducteurs (CEI 60445:2010)
Ta slovenski standard je istoveten z: EN 60445:2010
ICS:
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN 60445:2011 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60445:2011
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SIST EN 60445:2011
EUROPEAN STANDARD
EN 60445
NORME EUROPÉENNE
November 2010
EUROPÄISCHE NORM
ICS 29.020 Supersedes EN 60445:2007, EN 60446:2007
English version
Basic and safety principles for man-machine interface, marking and
identification -
Identification of equipment terminals, conductor terminations and
conductors
(IEC 60445:2010)
Principes fondamentaux et de sécurité Grund und Sicherheitsregeln für die
pour les interfaces homme-machines, le Mensch-Maschine-Schnittstelle -
marquage et l'identification - Kennzeichnung von Anschlüssen
Identification des bornes de matériels, des elektrischer Betriebsmittel,
extrémités de conducteurs et des angeschlossenen Leiterenden und Leitern
conducteurs (IEC 60445:2010)
(CEI 60445:2010)

This European Standard was approved by CENELEC on 2010-11-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,

the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,

Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,

Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60445:2010 E
---------------------- Page: 3 ----------------------
SIST EN 60445:2011
EN 60445:2010 - 2 -
Foreword

The text of document 16/479/FDIS, future edition 5 of IEC 60445, prepared by IEC TC 16, Basic and

safety principles for man-machine interface, marking and identification, was submitted to the

IEC-CENELEC parallel vote and was approved by CENELEC as EN 60445 on 2010-11-01.
This European Standard supersedes EN 60445:2007 and EN 60446:2007.

It has the status of a basic safety publication in accordance with IEC Guide 104.

This European Standard includes the following significant technical changes with respect to

EN 60445:2007 and EN60446:2007:
– addition of new definitions in Clause 3;

– revision of some clauses to use words from reference IEC standards. These revisions did not change

any technical requirements but to clarify the wording;

– addition of Annex B (informative) “List of notes concerning certain countries”.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent

rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60445:2010 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60079-11:2006 NOTE Harmonized as EN 60079-11:2007 (not modified).
IEC 60601 series NOTE Harmonized in EN 60601 series (partially modified).
IEC 61666:1997 NOTE Harmonized as EN 61666:1997 (not modified).
IEC 62491:2008 NOTE Harmonized as EN 62491:2008 (not modified).
__________
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SIST EN 60445:2011
- 3 - EN 60445:2010
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60417 - Graphical symbols for use on equipment - -
IEC 60617 - Graphical symbols for diagrams - -
IEC Guide 104 - The preparation of safety publications and the - -
use of basic safety publications and group
safety publications
ISO/IEC Guide 51 - Safety aspects - Guidelines for their inclusion - -
in standards
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SIST EN 60445:2011
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SIST EN 60445:2011
IEC 60445
Edition 5.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Basic and safety principles for man-machine interface, marking and
identification –
Identification of equipment terminals, conductor terminations and conductors
Principes fondamentaux et de sécurité pour les interfaces homme-machines, le
marquage et l’identification –
Identification des bornes de matériels, des extrémités de conducteurs et des
conducteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.020 ISBN 978-2-88912-166-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60445:2011
– 2 – 60445 © IEC:2010
CONTENTS

FOREWORD...........................................................................................................................4

INTRODUCTION.....................................................................................................................6

1 Scope...............................................................................................................................7

2 Normative references .......................................................................................................7

3 Terms and definitions .......................................................................................................7

4 Methods of identification...................................................................................................9

5 Application of identification means .................................................................................10

6 Identification by colours..................................................................................................10

6.1 General .................................................................................................................10

6.2 Use of single colours .............................................................................................11

6.2.1 Permitted colours ......................................................................................11

6.2.2 Neutral or mid-point conductors.................................................................11

6.2.3 Line conductors in AC-systems..................................................................11

6.3 Use of bi-colour combinations ...............................................................................11

6.3.1 Permitted colours ......................................................................................11

6.3.2 Protective conductors ................................................................................11

6.3.3 PEN conductors.........................................................................................12

6.3.4 PEL conductors .........................................................................................12

6.3.5 PEM conductors ........................................................................................12

6.3.6 Protective bonding conductors...................................................................13

7 Identification by alphanumeric notation...........................................................................13

7.1 General .................................................................................................................13

7.2 Equipment terminal identification – Marking principles...........................................13

7.3 Identification of certain designated conductors ......................................................16

7.3.1 General .....................................................................................................16

7.3.2 Neutral conductor ......................................................................................16

7.3.3 Protective conductor..................................................................................16

7.3.4 PEN conductor ..........................................................................................16

7.3.5 PEL conductor...........................................................................................16

7.3.6 PEM conductor ..........................................................................................16

7.3.7 Protective bonding conductor ....................................................................16

7.3.8 Protective bonding conductor earthed........................................................16

7.3.9 Protective bonding conductor unearthed....................................................16

7.3.10 Functional earthing conductor....................................................................16

7.3.11 Functional bonding conductor ....................................................................16

7.3.12 Mid-point conductor ...................................................................................16

7.3.13 Line conductor...........................................................................................17

Annex A (informative) Colours, alphanumeric notations and graphical symbols used

for identification of conductors / terminals.............................................................................

Annex B (informative) List of notes concerning certain countries..........................................20

Bibliography..........................................................................................................................24

Figure 1 – Single element with two terminals ........................................................................

Figure 2 – Single element with four terminals: two endpoints and two intermediate

points ...................................................................................................................................14

Figure 3 – Three-phase equipment with six terminals............................................................14

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SIST EN 60445:2011
60445 © IEC:2010 – 3 –
Figure 4 – Three-element equipment with twelve terminals: six endpoints and six

intermediate points ...............................................................................................................14

Figure 5 – Equipment with groups of elements......................................................................15

Figure 6 – Interconnection of equipment terminals and certain designated conductors..........15

Table A.1 – Colours, alphanumeric notations and graphical symbols used for

identification of conductors / terminals ..................................................................................18

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SIST EN 60445:2011
– 4 – 60445 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE
INTERFACE, MARKING AND IDENTIFICATION –
IDENTIFICATION OF EQUIPMENT TERMINALS, CONDUCTOR
TERMINATIONS AND CONDUCTORS
FOREWORD

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

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60445 has been prepared by IEC technical committee 16: Basic

and safety principles for man-machine interface, marking and identification.

This fifth edition is a merged version of IEC 60445 and IEC 60446, and cancels and replaces

the fourth edition of IEC 60445, published in 2006, and the fourth edition of IEC 60446,

published in 2007.

It has the status of a basic safety publication in accordance with IEC Guide 104.

This edition includes the following significant technical changes with respect to the previous edition:

a) addition of new definitions in Clause 3;

b) revision of some clauses to use words from reference IEC standards. These revisions did

not change any technical requirements but to clarify the wording;
---------------------- Page: 10 ----------------------
SIST EN 60445:2011
60445 © IEC:2010 – 5 –

c) addition of Annex B (informative) “List of notes concerning certain countries”.

The text of this standard is based on the following documents:
FDIS Report on voting
16/479/FDIS 16/480/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The reader’s attention is drawn to the fact that Annex B lists all of the “in-some-country”

clauses on differing practices of a less permanent nature relating to the subject of this

standard.

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

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 11 ----------------------
SIST EN 60445:2011
– 6 – 60445 © IEC:2010
INTRODUCTION

This basic safety publication is primarily intended for use by technical committees in the

preparation of standards in accordance with the principles laid down in IEC Guide 104 and

ISO/IEC Guide 51.

It is not intended for use by manufacturers or certification bodies. One of the responsibilities

of a technical committee is, wherever applicable, to make use of basic safety publications in

the preparation of its publications. The requirements of this basic safety publication will not

apply unless specifically referred to or included in the relevant publications.

In this fifth edition of IEC 60445, the terminology has been aligned with IEC 60050-195.

---------------------- Page: 12 ----------------------
SIST EN 60445:2011
60445 © IEC:2010 – 7 –
BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE
INTERFACE, MARKING AND IDENTIFICATION –
IDENTIFICATION OF EQUIPMENT TERMINALS, CONDUCTOR
TERMINATIONS AND CONDUCTORS
1 Scope

This International Standard applies to the identification and marking of terminals of electrical

equipment such as resistors, fuses, relays, contactors, transformers, rotating machines and,

wherever applicable, to combinations of such equipment (e.g. assemblies), and also applies

to the identification of terminations of certain designated conductors. It also provides general

rules for the use of certain colours or alphanumeric notations to identify conductors with the

aim of avoiding ambiguity and ensuring safe operation. These conductor colours or

alphanumeric notations are intended to be applied in cables or cores, busbars, electrical

equipment and installations.
2 Normative references

The following referenced documents are indispensable for the application of this document.

For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.
IEC 60417, Graphical symbols for use on equipment
IEC 60617, Graphical symbols for diagrams

IEC Guide 104, The preparation of safety publications and the use of basic safety publications

and group safety publications
ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE The terms are sorted in alphabetical order in the English language.
3.1
electrical equipment

item used for purposes like generation, conversion, distribution or utilization of electric energy

(e.g. electrical machines, transformers, switchgear and controlgear, measuring instruments,

wiring systems, current-using equipment, etc.)
[IEC 60050-826:2004, 826-16-01, modified]
3.2
functional bonding conductor
conductor provided for functional- equipotential bonding
[IEC 60050-195:1998, 195-02-16]
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SIST EN 60445:2011
– 8 – 60445 © IEC:2010
3.3
functional earthing
functional grounding (in US)

earthing a point or points in a system or in an installation or in equipment, for purposes other

than electrical safety
[IEC 60050-195, Amendment 1:2001, 195-01-13]
3.4
functional earthing conductor
functional grounding conductor (in US)
earthing conductor provided for functional earthing
[IEC 60050-195, 195-02-15]
3.5
functional-equipotential-bonding
equipotential bonding for operational reasons other than safety
[IEC 60050-195, 195-01-16]
3.6
line conductor
phase conductor (in AC systems) (deprecated)
pole conductor (in DC systems) (deprecated)

conductor which is energized in normal operation and capable of contributing to the

transmission or distribution of electric energy but which is not a neutral or mid-point conductor

[IEC 60050-195, 195-02-08]
3.7
mid-point conductor

conductor electrically connected to the mid-point and capable of contributing to the

distribution of electric energy
[IEC 60050-195, 195-02-07]
3.8
neutral conductor

conductor electrically connected to the neutral point and capable of contributing to the

distribution of electric energy
[IEC 60050-195, 195-02-06]
3.9
PEL conductor

conductor combining the functions of both a protective earthing conductor and a line

conductor
[IEC 60050-195, 195-02-14]
3.10
PEM conductor

conductor combining the functions of both a protective earthing conductor and a mid-point

conductor
[IEC 60050-195, 195-02-13]
---------------------- Page: 14 ----------------------
SIST EN 60445:2011
60445 © IEC:2010 – 9 –
3.11
PEN conductor

conductor combining the functions of both a protective earthing conductor and a neutral

conductor
[IEC 60050-195, 195-02-12]
3.12
protective bonding conductor
equipotential bonding conductor (deprecated)
protective conductor provided for protective-equipotential-bonding
[IEC 60050-195, 195-02-10]
3.13
protective bonding conductor, earthed
protective bonding conductor with a conductive path to earth
3.14
protective bonding conductor, unearthed
protective bonding conductor without a conductive path to earth
3.15
protective conductor
(identification: PE)

conductor provided for purposes of safety, for example protection against electric shock

[IEC 60050-195, 195-02-09]
3.16
protective earthing
protective grounding (in US)

earthing a point or points in a system or in an installation or in equipment, for purposes of

electrical safety
[IEC 60050-195, Amendment 1:2001, 195-01-11]
3.17
protective earthing conductor
protective grounding conductor (in US)
protective conductor provided for protective earthing
[IEC 60050-195:1998, 195-02-11]
3.18
protective-equipotential-bonding
equipotential bonding for the purposes of safety
[IEC 60050-195:1998, 195-01-15]
4 Methods of identification

Where the identification of equipment terminals and of terminations of certain designated

conductors is considered necessary, it shall be effected by the use of one or more of the

following methods:

– the physical or relative location of the equipment terminals or of terminations of certain

designated conductors;
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SIST EN 60445:2011
– 10 – 60445 © IEC:2010

– a colour code for equipment terminals and terminations of certain designated conductors

in accordance with Clause 6;

– graphical symbols in accordance with IEC 60417. If additional symbols are required, these

shall be consistent with IEC 60617;
– an alphanumeric notation in accordance with the system laid down in Clause 7.

To keep consistency with the documentation, conductor and equipment terminal designation,

the alphanumeric notation is recommended.

Identification of conductors by colours shall be in accordance with the requirements provided

in Clause 6. Identification of conductors by alphanumeric notation shall be in accordance with

the requirements provided in Clause 7.

NOTE It is recognised that for complex systems and installations additional marking and labelling may be needed

for reasons other than safety, see for example IEC 62491.
5 Application of identification means

The identifying colour, graphical symbol or alphanumeric notation shall be located on, or

adjacent to, the corresponding terminal.

When more than one identification method is used and confusion is possible, the correlation

between the methods shall be clarified in the associated documentation.

When no confusion is possible, the juxtaposition of numerical and alphanumeric notation may

be applied.

Terminals/conductors used for earthing are divided concerning their purpose of earthing into

the two basic concept of protective earthing and functional earthing.

– If a terminal or conductor fulfils the requirements for both protective earthing and

functional earthing, it shall be designated as a protective earthing terminal/conductor.

– If the requirements for protective earthing are not met by a functional earthing

terminal/conductor, it shall not be marked with an identification of a protective earthing

terminal/conductor.

– The requirements for functional earthing are to be defined by the manufacturer or the

relevant product committee and should be specified within the documentation of the

equipment.
NOTE For example requirements for handling EMC issues.
6 Identification by colours
6.1 General
For identification of conductors, the following colours are permitted:

– black, brown, red, orange, yellow, green, blue, violet, grey, white, pink, turquoise.

NOTE This list of colours is derived from IEC 60757.

The identification by colour shall be used at terminations and preferably throughout the length

of the conductor either by the colour of the insulation or by colour markers, except for bare

conductors where the colour identification shall be at termination and connection points.

Identification by colour or marking is not required for
– concentric conductors of cables,
---------------------- Page: 16 ----------------------
SIST EN 60445:2011
60445 © IEC:2010 – 11 –
– metal sheath or armour of cables when used as a protective conductor,
– bare conductors where permanent identification is not practicable,
– extraneous-conductive-parts used as a protective conductor,
– exposed-conductive-parts used as a protective conductor.

Additional markings, for example alphanumerical, are allowed, provided that the colour

identification remains unambiguous.
6.2 Use of single colours
6.2.1 Permitted colours

The single colours green and yellow are only permitted where confusion with the colouring of

the conductors in accordance with 6.3.2 to 6.3.6 is not likely to occur.
6.2.2 Neutral or mid-point conductors

Where a circuit includes a neutral or mid-point conductor identified by colour, the colour used

for this purpose shall be blue. In order to avoid confusion with other colours it is

recommended to use an unsaturated colour blue, often called "light blue". Blue shall not be

used for identifying any other conductor where confusion is possible.

In the absence of a neutral or mid-point conductor within the whole wiring system, a conductor

identified by blue may be used for any other purposes, except as a protective conductor.

If identification by colour is used, bare conductors used as neutral or mid-point conductors

shall be either coloured by a blue stripe, 15 mm to 100 mm wide in each unit or enclosure and

each accessible position, or coloured blue throughout their length.

NOTE IEC 60079-11 prescribes blue when a colour is used for the marking of terminal, terminal boxes, plugs

...

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