EN IEC 60445:2021
(Main)Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors
Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals, conductor terminations and conductors
IEC 60445:2021 is available as IEC 60445:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60445:2021 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. 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 has the status of a basic safety publication in accordance with IEC Guide 104. IEC 60445:2021 cancels and replaces the sixth edition published in 2017. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the definitions have been aligned with IEC 60050-195:2021 and IEC 60050-826; b) the provisions for colour to be used for identification of certain designated conductors are made requirements and not only recommendations; c) introduction of a new subclause on marking of protective terminals for multiple power supply inputs on equipment.
Grund- und Sicherheitsregeln für die Mensch-Maschine-Schnittstelle - Kennzeichnung von Anschlüssen elektrischer Betriebsmittel, angeschlossenen Leiterenden und Leitern
Principes fondamentaux et de sécurité pour les interfaces hommes-machines, le marquage et l'identification - Identification des bornes de matériels, des extrémités de conducteurs et des conducteurs
IEC 60445:2021 est disponible sous forme de IEC 60445:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60445:2021 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). Il s’applique également à l’identification des extrémités de certains conducteurs désignés. Il 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 d’assurer la sécurité de fonctionnement. Ces couleurs et caractères alphanumériques destinés aux conducteurs sont prévus pour être appliqués aux noyaux, aux barres omnibus et aux matériels électriques, ainsi qu’aux câbles ou installations. La présente publication fondamentale de sécurité axée sur les exigences de sécurité essentielles est principalement destinée à être utilisée par les comités d’études lors de l’élaboration des normes conformément aux principes énoncés dans le Guide 104 de l’IEC et le Guide ISO/IEC 51. L'IEC 60445:2021 annule et remplace la sixième édition parue en 2017. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) les définitions ont été harmonisées avec l’IEC 60050-195:2021 et l’IEC 60050-826; b) les dispositions relatives aux couleurs à utiliser pour l’identification de certains conducteurs désignés sont à présent des exigences et ne sont plus de simples recommandations; c) introduction d’un nouveau paragraphe sur le marquage des bornes de protection pour des entrées d’alimentation multiples sur un matériel.
Osnovna in varnostna načela za vmesnik človek-stroj, označevanje in razpoznavanje - Razpoznavanje terminalov opreme, končnikov vodnikov in vodnikov (IEC 60445:2021)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN 60445:2018
Osnovna in varnostna načela za vmesnik človek-stroj, označevanje in
razpoznavanje - Razpoznavanje terminalov opreme, končnikov vodnikov in
vodnikov (IEC 60445:2021)
Basic and safety principles for man-machine interface, marking and identification -
Identification of equipment terminals, conductor terminations and conductors (IEC
60445:2021)
Grund- und Sicherheitsregeln für die Mensch-Maschine- Schnittstelle - Kennzeichnung
von Anschlüssen elektrischer Betriebsmittel, angeschlossenen Leiterenden und Leitern
(IEC 60445:2021)
Principes fondamentaux et de sécurité pour les interfaces hommes-machines, le
marquage et lidentification - Identification des bornes de matériels, des extrémités de
conducteurs et des conducteurs (IEC 60445:2021)
Ta slovenski standard je istoveten z: EN IEC 60445:2021
ICS:
01.080.20 Grafični simboli za posebno Graphical symbols for use on
opremo specific equipment
13.110 Varnost strojev Safety of machinery
29.020 Elektrotehnika na splošno Electrical engineering in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60445
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 01.080.20; 13.110; 29.020 Supersedes EN 60445:2017 and all of its amendments
and corrigenda (if any)
English Version
Basic and safety principles for man-machine interface, marking
and identification - Identification of equipment terminals,
conductor terminations and conductors
(IEC 60445:2021)
Principes fondamentaux et de sécurité pour les interfaces Grund- und Sicherheitsregeln für die Mensch-Maschine-
hommes-machines, le marquage et l¿identification - Schnittstelle - Kennzeichnung von Anschlüssen elektrischer
Identification des bornes de matériels, des extrémités de Betriebsmittel, angeschlossenen Leiterenden und Leitern
conducteurs et des conducteurs (IEC 60445:2021)
(IEC 60445:2021)
This European Standard was approved by CENELEC on 2021-08-20. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60445:2021 E
European foreword
The text of document 3/1491/FDIS, future edition 7 of IEC 60445, prepared by IEC/TC 3
“Documentation, graphical symbols and representations of technical information” was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 60445:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–05–20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–08–20
document have to be withdrawn
This document supersedes EN 60445:2017 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60445:2021 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 NOTE Harmonized as EN 60079-11
IEC 60757 NOTE Harmonized as HD 457 S1
IEC 61666:2010 NOTE Harmonized as EN 61666:2010 (not modified)
IEC 62491 NOTE Harmonized as EN 62491
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60417 - Graphical symbols for use on equipment - -
IEC 60617 - Graphical symbols for diagrams - -
IEC 60445 ®
Edition 7.0 2021-07
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-machine,
le marquage et l’identification – Identification des bornes de matériels,
des extrémités de conducteurs et des conducteurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.080.20; 13.110; 29.020 ISBN 978-2-8322-9921-0
– 2 – IEC 60445:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 6
4 Methods of identification . 10
5 Application of identification means . 10
6 Identification by colours . 11
6.1 General . 11
6.2 Use of single colours . 11
6.2.1 The use of the single colours GREEN and YELLOW . 11
6.2.2 Neutral or mid-point conductor . 12
6.2.3 Line conductor in AC system . 12
6.2.4 Line conductor in DC system . 12
6.2.5 Functional earthing conductor . 12
6.3 Use of bi-colour combinations . 12
6.3.1 Permitted colours . 12
6.3.2 Protective conductor . 12
6.3.3 PEN conductor . 13
6.3.4 PEL conductor . 13
6.3.5 PEM conductor . 14
6.3.6 Protective bonding conductor . 14
7 Identification by alphanumeric notation . 14
7.1 General . 14
7.2 Equipment terminal identification – Marking principles . 14
7.3 Identification of certain designated conductors . 17
7.3.1 General . 17
7.3.2 Neutral conductor . 17
7.3.3 Protective conductor . 17
7.3.4 PEN conductor . 17
7.3.5 PEL conductor . 17
7.3.6 PEM conductor . 17
7.3.7 Protective bonding conductor . 17
7.3.8 Functional earthing conductor . 18
7.3.9 Functional bonding conductor . 18
7.3.10 Mid-point conductor . 18
7.3.11 Line conductor . 18
7.3.12 System-referencing-conductor . 18
Annex A (informative) Colours, alphanumeric notations and graphical symbols used
for identification of conductors and terminals . 19
Annex B (informative) List of notes concerning particular conditions in certain
countries . 21
Bibliography . 26
Figure 1 – Single element with two terminals . 15
IEC 60445:2021 © IEC 2021 – 3 –
Figure 2 – Single element with four terminals: Two endpoints and two intermediate
points . 15
Figure 3 – Three-phase equipment with six terminals . 15
Figure 4 – Three-element equipment with twelve terminals: Six endpoints and six
intermediate points . 16
Figure 5 – Equipment with groups of elements . 16
Figure 6 – Interconnection of equipment terminals and certain designated conductors . 17
Table A.1 – Colours, alphanumeric notations and graphical symbols used for
identification of conductors and terminals . 19
– 4 – IEC 60445:2021 © IEC 2021
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.
IEC 60445 has been prepared by IEC technical committee 3: Documentation, graphical symbols
and representations of technical information. It is an International Standard.
It has the status of a basic safety publication in accordance with IEC Guide 104.
This seventh edition cancels and replaces the sixth edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the definitions have been aligned with IEC 60050-195:2021 and IEC 60050-826:— ;
_____________
Third edition under preparation. Stage at time of publication: IEC FDIS 60050-826:2021.
IEC 60445:2021 © IEC 2021 – 5 –
b) the provisions for colour to be used for identification of certain designated conductors are
made requirements and not only recommendations;
c) introduction of a new subclause on marking of protective terminals for multiple power supply
inputs on equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
3/1491/FDIS 3/1517/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 International Standard is English.
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 www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document 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.
– 6 – IEC 60445:2021 © IEC 2021
BASIC AND SAFETY PRINCIPLES FOR MAN-MACHINE
INTERFACE, MARKING AND IDENTIFICATION –
IDENTIFICATION OF EQUIPMENT TERMINALS,
CONDUCTOR TERMINATIONS AND CONDUCTORS
1 Scope
This document 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 it 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 and alphanumeric
notations are intended to be applied on cores, busbars, and electrical equipment, and in cables
or installations.
This basic safety publication focusing on safety essential requirements 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 (available at http://www.graphical-
symbols.info/equipment)
IEC 60617, Graphical symbols for diagrams (available at http://std.iec.ch/iec60617)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE The terms are sorted in alphabetical order in the English language.
IEC 60445:2021 © IEC 2021 – 7 –
3.1
earthing
grounding, US
electric connections between conductive parts and local earth
[SOURCE: IEC 60050-195:2021, 195-01-24]
3.2
earthed protective bonding conductor
protective bonding conductor which has a conductive path to local earth
3.3
electrical equipment
item used for generation, conversion, transmission, distribution or utilization of electric energy
Note 1 to entry: Examples of such items are electric machines, transformers, switchgear and controlgear,
measuring instruments, protective devices, wiring systems, current-using equipment.
[SOURCE: IEC 60050-826:—, 826-16-01]
3.4
electrical safety
freedom from risk that is not tolerable and which is caused by electricity
[SOURCE: IEC 60050-195:2021, 195-01-20]
3.5
equipotential bonding
set of electric connections intended to achieve equipotentiality between conductive parts
[SOURCE: IEC 60050-195:2021, 195-01-10]
3.6
equipotentiality
state when conductive parts are at a substantially equal electric potential
[SOURCE: IEC 60050-195:2021, 195-01-09]
3.7
functional bonding conductor
conductor provided for functional-equipotential-bonding
[SOURCE: IEC 60050-195:2021, 195-02-16]
3.8
functional earthing
functional grounding, US
earthing for purposes other than electrical safety
[SOURCE: IEC 60050-195:2021, 195-01-13]
3.9
functional earthing conductor
functional grounding conductor, US
conductor provided for functional earthing
[SOURCE: IEC 60050-195:2021, 195-02-15]
– 8 – IEC 60445:2021 © IEC 2021
3.10
functional-equipotential-bonding
equipotential bonding for reasons other than electrical safety
[SOURCE: IEC 60050-195:2021, 195-01-16]
3.11
line conductor
conductor intended to be energized and capable of contributing to the transmission or
distribution of electric energy but which is not a neutral conductor or mid-point conductor
[SOURCE: IEC 60050-195:2021, 195-02-08, modified – Note 1 to entry removed.]
3.12
local earth
local ground, US
part of the Earth that is in electric contact with an earth electrode and that has an electric
potential not necessarily equal to zero
[SOURCE: IEC 60050-195:2021, 195-01-03]
3.13
mid-point
common point between two symmetrical circuit elements of which the opposite ends are
electrically connected to different line conductors of the same circuit
[SOURCE: IEC 60050-195:2021, 195-02-04]
3.14
mid-point conductor
conductor electrically connected to the mid-point and capable of contributing to the distribution
of electric energy
[SOURCE: IEC 60050-195:2021, 195-02-07]
3.15
neutral conductor
conductor electrically connected to the neutral point and capable of contributing to the
distribution of electric energy
[SOURCE: IEC 60050-195:2021, 195-02-06]
3.16
neutral point
common point of a star-connected polyphase system
[SOURCE: IEC 60050-195:2021, 195-02-05]
3.17
PEL conductor
conductor combining the functions of both a protective earthing conductor and a line conductor
[SOURCE: IEC 60050-195:2021, 195-02-14]
IEC 60445:2021 © IEC 2021 – 9 –
3.18
PEM conductor
conductor combining the functions of both a protective earthing conductor and a mid-point
conductor
[SOURCE: IEC 60050-195:2021, 195-02-13]
3.19
PEN conductor
conductor combining the functions of both a protective earthing conductor and a neutral
conductor
[SOURCE: IEC 60050-195:2021, 195-02-12]
3.20
protective bonding conductor
protective conductor provided for protective-equipotential-bonding
[SOURCE: IEC 60050-195:2021, 195-02-10]
3.21
protective conductor
equipment grounding conductor, US
grounding electrode conductor, US
conductor provided for purposes of electrical safety
Note 1 to entry: The terms "equipment grounding conductor" and "grounding electrode conductor" are used in the
US depending on their application.
[SOURCE: IEC 60050-195:2021, 195-02-09, modified – Two synonyms and Note 1 to entry
have been added.]
3.22
protective earthing
protective grounding, US
earthing for purposes of electrical safety
[SOURCE: IEC 60050-195:2021, 195-01-11]
3.23
protective earthing conductor
PE conductor
protective grounding conductor, US
protective conductor provided for protective earthing
[SOURCE: IEC 60050-195:2021, 195-02-11]
3.24
protective-equipotential-bonding
equipotential bonding for the purposes of electrical safety
[SOURCE: IEC 60050-195:2021, 195-01-15]
– 10 – IEC 60445:2021 © IEC 2021
3.25
protective terminal
terminal provided on equipment and intended for the electric connection with a protective
conductor
[SOURCE: IEC 60050-195:2021, 195-02-43]
3.26
system-referencing-conductor
conductor between a live conductor and the earthing arrangement to enable the live conductor
to be substantially at the same potential as the Earth
[SOURCE: IEC 60050-826: —, 826-13-38]
3.27
terminal
conductive part of electrical equipment provided for connecting that electrical equipment to one
or more external conductors
[SOURCE: IEC 60050-151:2001, 151-12-12, modified – "device, electric circuit or electric
network" is replaced by "electrical equipment", and Note 1 to entry is removed.]
3.28
unearthed protective bonding conductor
protective bonding conductor which is isolated from the Earth
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;
– 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.
NOTE 1 It is recognised that for complex systems and installations additional marking and labelling are used for
reasons other than safety, see for example IEC 62491.
NOTE 2 Annex A contains Table A.1 which provides an overview of identifications of certain designated conductors
and equipment terminals to which these conductors are likely to be connected.
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.
IEC 60445:2021 © IEC 2021 – 11 –
When no confusion is possible, the juxtaposition of numerical and alphanumeric notation may
be applied.
Terminals and conductors used for earthing or equipotential bonding are divided according to
their purpose of earthing/bonding into the two basic concepts of protective purposes and
functional purposes:
– If a terminal or conductor fulfils the requirements for both protective purposes and functional
purposes, it shall be designated as a protective terminal or protective conductor,
respectively.
– If the requirements for protective purposes are not met by a terminal or conductor intended
for functional purposes, the terminal or conductor shall not be marked with an identification
of a protective terminal or protective conductor, respectively.
– The requirements for functional earthing or functional-equipotential-bonding shall be defined
by the manufacturer or the relevant product committee and should be specified within the
documentation of the equipment.
NOTE 1 For example, requirements for handling electromagnetic compatibility (EMC) issues.
NOTE 2 Annex A contains Table A.1 which provides an overview of identifications of certain designated conductors
and equipment terminals to which these conductors are likely to be connected.
6 Identification by colours
6.1 General
For identification of conductors, only the following colours shall be used:
BLACK, BROWN, RED, ORANGE, GREEN, YELLOW, 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 cab
...
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