oSIST prEN IEC 62491:2025

SLOVENSKI STANDARD
01-december-2025
Industrijski sistemi, inštalacije, oprema in industrijski izdelki - Označevanje kablov
in žil
Industrial systems, installations and equipment and industrial products - Labelling of
cables and cores
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Beschriftung
von Kabeln / Leitungen und Adern
Systèmes industriels, installations et appareils et produits industriels - Étiquetage des
câbles et de leurs âmes
Ta slovenski standard je istoveten z: prEN IEC 62491:2025
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
29.060.01 Električne žice in kabli na Electrical wires and cables in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

3/1745/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62491 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:

2025-10-10 2026-01-02
SUPERSEDES DOCUMENTS:
3/1706/CD, 3/1744/CC
IEC TC 3 : DOCUMENTATION, GRAPHICAL SYMBOLS AND REPRESENTATIONS OF TECHNICAL INFORMATION
SECRETARIAT: SECRETARY:
Sweden Mr Mikael Törnkvist
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 16,TC 17,TC 44
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Industrial systems, installations and equipment and industrial products - Labelling of cables and cores

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

IEC CDV 62491 © IEC 2025
1 CONTENTS
3 1 Scope . 6
4 2 Normative references . 6
5 3 Terms and definitions . 6
6 4 Rules . 8
7 4.1 General requirements . 8
8 4.2 Use of designated cable cores . 9
9 4.3 Use of additional labelling . 9
10 5 Identification labelling . 10
11 5.1 General . 10
12 6 Connection labelling . 14
13 6.1 General . 14
14 6.2 Local-end connection labelling . 14
15 6.3 Remote-end connection labelling . 15
16 6.4 Both-end connection labelling . 16
17 7 Signal labelling . 16
18 7.1 General . 16
19 7.2 Labelling by signal designation . 16
20 7.3 Labelling of cables for certain designated conductors . 17
21 8 Composite labelling . 18
22 9 Arrangement of additional labelling . 18
23 9.1 General . 18
24 9.2 Relative positions of the labelling . 19
25 9.3 Characters to be used . 19
26 10 Correspondence between labelling and documentation . 20
27 11 Conformance to this standard . 20
28 Annex A Examples of labelling . 21
29 A.1 General . 21
30 A.2 Identification labelling (method R) . 21
31 A.3 Local-end connection labelling (method CL) . 22
32 A.4 Both-end connection labelling (method CB) . 23
33 A.5 Attachment of additional information . 23
34 A.6 Signal labelling (method S) . 24
35 A.7 Composite labelling (method CL+ R) . 25
36 A.8 Use of cable colours (method A) . 25
38 Figure 1 – Example of identification labelling of a single core cable (W23) and of a
39 multi-core cable (W24) in which also the different cores are labelled . 11
40 Figure 2 – Example of identification markings for a control cable (WGA23) and a low-
41 voltage cable (WDB24) . 12
42 Figure 3 – Example of identification labelling of cores where the initial part of the
43 reference designation has been partly omitted . 12
44 Figure 4 – Example of Identification markings for branch cables . 13
45 Figure 5 – Example of local-end connection labelling . 14
46 Figure 6 – Example of remote-end connection labelling for a connection inside a unit . 15
IEC CDV 62491 © IEC 2025
47 Figure 7 – Example of remote-end connection labelling for a cable between different
48 units . 15
49 Figure 8 – Example of both-end connection labelling . 16
50 Figure 9 – Example of local-end connection labelling combined with signal labelling . 18
51 Figure 10 – Example of composite labelling in which both-end connection labelling is
52 used together with identification labelling and signal labelling . 18
53 Figure 11 – Examples of arrangements of labelling on cores or cables. . 19
54 Figure A.1 – Circuit diagram used as a basis for the examples . 21
55 Figure A.2 – Example of identification labelling . 22
56 Figure A.3 – Example of local-end labelling . 23
57 Figure A.4 – Example of both-end connection labelling . 23
58 Figure A.5 – Example of local end connection labelling with additional information . 24
59 Figure A.6 – Example of signal labelling . 25
60 Figure A.7 – Example of composite labelling （CL+R） . 25
61 Figure A.8 – Example where use is made of the cable colours . 26
63 Table 1 – Example of connection table in which the cable cores are identified by
64 means of codes for their colour . 9
65 Table 2 – Connection table corresponding to Figure 1 with labelling . 11
66 Table 3 – Connection table corresponding to Figure 2with labelling . 12
67 Table 4 – Connection table corresponding to Figure 3 with labelling . 13
68 Table 5 – Wiring table corresponding to the markings in Figure 4 . 13
69 Table 6 – Marking of certain designated conductors . 17
70 Table 7 – Methods of labelling defined in this standard . 20
IEC CDV 62491 © IEC 2025
74 INTERNATIONAL ELECTROTECHNICAL COMMISSION
75 ____________
77 INDUSTRIAL SYSTEMS, INSTALLATIONS
78 AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
79 LABELLING OF CABLES AND CORES
82 FOREWORD
83 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all
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91 determined by agreement between the two organizations.
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111 IEC shall not be held responsible for identifying any or all such patent rights.
112 International Standard IEC 62491 has been prepared by IEC technical committee 3:
113 Documentatíon, graphical symbols and representations of technical information.
114 This second edition cancels and replaces the first edition published in 2008. This edition
115 constitutes
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