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

IEC 62491:2008 provides rules and guidelines for the labelling of cables and cores/conductors used in industrial installations, equipment and products, in order to maintain a clear relation between the technical documentation and the actual equipment and for other purposes. International Standard IEC 62491 has been prepared by IEC technical committee 3: Information structures, documentation and graphical symbols.

Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Beschriftung von Kabeln / Leitungen und Adern

Systèmes industriels, installations et appareils et produits industriels - Etiquetage des câbles et des conducteurs isolés

La CEI 62491:2008 fournit les règles et lignes directrices d'étiquetage des câbles et des conducteurs isolés/conducteurs utilisés dans les installations, appareils et produits industriels, afin de conserver une relation claire entre la documentation technique et le matériel réel, ainsi qu'à d'autres fins. La Norme internationale CEI 62491 a été établie par le comité d'études 3 de la CEI: Structures d'informations, documentation et symboles graphiques.

Industrijski sistemi, inštalacije, oprema in industrijski izdelki - Označevanje kablov in žil (IEC 62491:2008)

General Information

Status
Published
Publication Date
04-Sep-2008
Current Stage
6060 - Document made available
Start Date
05-Sep-2008
Completion Date
05-Sep-2008

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SLOVENSKI STANDARD
SIST EN 62491:2008
01-november-2008

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Industrial systems, installations and equipment and industrial products - Labelling of

cables and cores (IEC 62491:2008)

Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Beschriftung

von Kabeln / Leitungen und Adern (IEC 62491:2008)

Systemes, installations, appareils et produits industriels - Marquage des câbles et des

conducteurs isolés (CEI 62491:2008)
Ta slovenski standard je istoveten z: EN 62491:2008
ICS:
01.110 7HKQLþQDGRNXPHQWDFLMD]D Technical product
L]GHONH documentation
29.060.01 (OHNWULþQHåLFHLQNDEOLQD Electrical wires and cables in
VSORãQR general
SIST EN 62491:2008 en,fr

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

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SIST EN 62491:2008
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SIST EN 62491:2008
EUROPEAN STANDARD
EN 62491
NORME EUROPÉENNE
September 2008
EUROPÄISCHE NORM
ICS 01.110; 29.020.20
English version
Industrial systems, installations and equipment
and industrial products -
Labelling of cables and cores
(IEC 62491:2008)
Systèmes industriels, installations Industrielle Systeme, Anlagen
et appareils et produits industriels - und Ausrüstungen und Industrieprodukte -
Etiquetage des câbles et Beschriftung von Kabeln / Leitungen
des conducteurs isolés und Adern
(CEI 62491:2008) (IEC 62491:2008)

This European Standard was approved by CENELEC on 2008-07-01. 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, 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
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62491:2008 E
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SIST EN 62491:2008
EN 62491:2008 - 2 -
Foreword

The text of document 3/849/CDV, future edition 1 of IEC 62491, prepared by IEC TC 3, Information

structures, documentation and graphical symbols, was submitted to the IEC-CENELEC parallel vote and

was approved by CENELEC as EN 62491 on 2008-07-01.
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) 2009-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 62491:2008 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60446 NOTE Harmonized as EN 60446:2007 (not modified).
__________
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SIST EN 62491:2008
- 3 - EN 62491:2008
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
1) 2)
IEC 60445 (mod) - Basic and safety principles for man-machine EN 60445 2007
interface, marking and identification -
Identification of equipment terminals and
conductor terminations
1) 2)
IEC 60757 - Code for designation of colours HD 457 S1 1985
IEC 61082-1 2006 Preparation of documents used in EN 61082-1 2006
electrotechnology -
Part 1: Rules
1) 2)
IEC 61175 - Industrial systems, installations and EN 61175 2005
equipment and industrial products -
Designation of signals
1) 2)
IEC 61666 - Industrial systems, installations and EN 61666 1997
equipment and industrial products -
Identification of terminals within a system
IEC 81346-1 200X Industrial systems, installations and - -
equipment and industrial products -
Structuring principles and reference
designations -
Part 1: Basic rules
ISO/IEC 646 - Information technology - ISO 7-bit coded - -
character set for information interchange
Undated reference.
Valid edition at date of issue.
To be published.
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SIST EN 62491:2008
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SIST EN 62491:2008
IEC 62491
Edition 1.0 2008-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial systems, installations and equipment and industrial products –
Labelling of cables and cores
Systèmes industriels, installations et appareils et produits industriels –
Etiquetage des câbles et des conducteurs isolés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 01.110; 29.020.20 ISBN 2-8318-9663-0
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SIST EN 62491:2008
– 2 – 62491 © IEC:2008
CONTENTS

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

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

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

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

3 Terms and definitions .......................................................................................................8

4 Rules................................................................................................................................9

4.1 General requirements..............................................................................................9

4.2 Use of designated cable cores...............................................................................10

4.3 Use of additional labelling .....................................................................................10

5 Identification labelling.....................................................................................................11

5.1 General .................................................................................................................11

6 Connection labelling .......................................................................................................14

6.1 General .................................................................................................................14

6.2 Local-end connection labelling ..............................................................................14

6.3 Remote-end connection labelling...........................................................................15

6.4 Both-end connection labelling................................................................................16

7 Signal labelling...............................................................................................................17

7.1 General .................................................................................................................17

7.2 Labelling by signal designation..............................................................................17

7.3 Labelling of cables for certain designated conductors............................................18

8 Composite labelling ........................................................................................................19

9 Arrangement of additional labelling.................................................................................20

9.1 General .................................................................................................................20

9.2 Relative positions of the labelling ..........................................................................20

9.3 Characters to be used ...........................................................................................20

10 Correspondence between labelling and documentation...................................................21

11 Conformance to this standard.........................................................................................21

Annex A (informative) Examples of labelling .........................................................................22

Bibliography..........................................................................................................................30

Figure 1 – Example of identification labelling of a single core cable (W23) and of a

multi-core cable (W24) in which also the different cores are labelled ....................................12

Figure 2 – Example of identification labelling of cores where the initial part of the

reference designation has been partly omitted ......................................................................13

Figure 3 – Example of local-end connection labelling............................................................14

Figure 4 – Example of remote-end connection labelling for a connection inside a unit...........15

Figure 5 – Example of remote-end connection labelling for a cable between different

units .....................................................................................................................................16

Figure 6 – Example of both-end connection labelling ............................................................17

Figure 7 – Example of local-end connection labelling combined with signal labelling.............19

Figure 8 – Example of composite labelling in which both-end connection labelling is

used together with identification labelling and signal labelling...............................................19

Figure 9 – Examples of arrangements of labelling on cores or cables. ..................................20

Figure A.1 – Circuit diagram used as a basis for the examples .............................................22

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SIST EN 62491:2008
62491 © IEC:2008 – 3 –

Figure A.2 – Example of identification labelling .....................................................................23

Figure A.3 – Example of local-end labelling ..........................................................................24

Figure A.4 – Example of both-end connection labelling .........................................................25

Figure A.5 – Example of local end connection labelling with additional information ...............26

Figure A.6 – Example of signal labelling ...............................................................................27

Figure A.7 – Example of composite labelling.........................................................................28

Figure A.8 – Example where use is made of the cable colours ..............................................29

Table 1 – Example of connection table in which the cable cores are identified by

means of codes for their colour.............................................................................................10

Table 2 – Connection table corresponding to Figure 1 with labelling .....................................12

Table 3 – Connection table corresponding to Figure 2 with labelling .....................................13

Table 4 – Marking of certain designated conductors..............................................................18

Table 5 – Methods of labelling defined in this standard .........................................................21

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SIST EN 62491:2008
– 4 – 62491 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
LABELLING OF CABLES AND CORES
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 62491 has been prepared by IEC technical committee 3:
Information structures, documentation and graphical symbols.
The text of this standard is based on the following documents:
CDV Report on voting
3/849/CDV 3/881/RVC

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.

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SIST EN 62491:2008
62491 © IEC:2008 – 5 –

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

the maintenance result 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.
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SIST EN 62491:2008
– 6 – 62491 © IEC:2008
INTRODUCTION

Additional labelling of cables and cores might be required within larger systems or

installations with many cores of the same colour or with many cables, and where therefore the

use of the designations provided by the cable manufacturer only would be ambiguous.

Due consideration should be given to the fact that additional labelling will cause additional

cost, usually increasing with the number of characters in the labelling string and the number

of different labelling elements. The available space may also impose restrictions with regard

to the number of characters, their height and the length of the labelling. As a general rule the

use of additional labelling should therefore be limited to a necessary minimum and be kept as

short as practicable.

However, also the advantages and benefits should be taken into considerations in choosing

additional labelling of cables and cores.

It is important to notice that a single machine or a system has different needs of information in

the different phases of its lifecycles (assembling, production, service and maintenance).

Additional labelling of cables and cores gives the following advantages:

• the possibilities to communicate and identify signals and connections across different

involved engineering disciplines and departments like:
– process engineering,
– software engineering,
– electrical engineering,
– mechanical/fluid engineering,
– control engineering;

• minimizing the time used to locate an eventual error (and the reason for it) in the test

phase;

• saving time when locating an eventual error (and the reason for it) in the service and

maintenance phase;

• remove the doubt of which core should be connected to which terminal, when replacing

components that are placed close to each other;

• if used in pre-planning, it gives a clear view for panel-builders, electricians/technicians;

service/maintenance and system controllers which will minimize misunderstandings
regarding connections.

Besides being used in connections between terminal blocks, labelling can also be used when

single core cables connect components inside units as: cubicle, pulpit, case, etc.; such

methods make possible:
• a rapid and secure cabling between the terminals of two objects;

• a rapid visual check of cabling, not necessarily looking up in the circuit diagrams;

• a correct and secure change of an object during the maintenance operations of plants.

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SIST EN 62491:2008
62491 © IEC:2008 – 7 –
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
LABELLING OF CABLES AND CORES
1 Scope

This standard provides rules and guidelines for the labelling of cables and cores/conductors

used in industrial installations, equipment and products, in order to maintain a clear relation

between the technical documentation and the actual equipment and for other purposes. The

following methods are described and designated:
• use of coloured cables and designated cores;
• additional identification labelling;
• additional connection labelling; and
• additional signal labelling.

The physical design of the labels, the material to be used for the labels as well as cable

manufacturers’ product bound marking of cables and cores are not part of this standard.

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

– Identification of equipment terminals and conductor terminations
IEC 60757, Code for designation of colours

IEC 61082-1:2006, Preparation of documents used in electrotechnology – Part 1: Rules

IEC 61175, Industrial systems, installations and equipment and industrial products –

Designation of signals

IEC 81346-1, Industrial systems, installations and equipment and industrial products –

Structuring principles and reference designations – Part 1: Basic rules (to be published)

IEC 61666, Industrial systems, installations and equipment and industrial products –

Identification of terminals within a system

ISO/IEC 646, Information technology – ISO 7-bit coded character set for information

interchange
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SIST EN 62491:2008
– 8 – 62491 © IEC:2008
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
conductor (of a cable)
part of a cable which has the specific function of carrying current
[IEV 461-01-01]
3.2
cable

assembly of one or more conductors and/or optical fibres, with a protective covering and

possibly filling, insulating and protective material
[IEV 151-12-38]
3.3
core
assembly comprising a conductor with its own insulation (and screens if any)
[IEV 461-04-04]
3.4
terminal

conductive part of a device, electric circuit or electric network, provided for connecting that

device, electric circuit or electric network to one or more external conductors
[IEV 151-12-12, modified]
3.5
terminal block

assembly of terminals in a housing or body of insulating material to facilitate interconnection

between multiple conductors
[IEV 581-06-36]
3.6
terminal designation

identifier of a terminal with respect to the object to which it belongs, related to one aspect of

the object.
[IEC 61666, 3.8]
3.7
signal designation
unambiguous identifier of a signal within a system
[IEC 61175, 3.2]
3.8
reference designation

identifier of a specific object with respect to the system of which the object is a constituent,

based on one or more aspects of that system
3.9
labelling (of a cable or core)

label or labels attached to a cable or core indicating appropriate characteristics

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SIST EN 62491:2008
62491 © IEC:2008 – 9 –
3.10
identification labelling

labelling showing the identifier of an object as a constituent of a specific installation, system,

equipment or product
3.11
connection labelling

labelling of a cable or core showing the identifier of the terminal, terminal block or equipment

to which it is connected
3.12
local-end connection labelling

system of labelling of cables and cores where the labelling of the end of the cable or core

refers to the terminal, terminal block or equipment to which it is connected
3.13
remote-end connection labelling

system of labelling of cables and cores where the labelling of the end of the cable or core

refers to the terminal, terminal block or equipment to which the other end of it is connected

3.14
both-end connection labelling

system of labelling of cables and cores where each end of a cable or core is provided with

local-end connection labelling and remote-end connection labelling
3.15
signal labelling

system of labelling of cables and cores used as a supplement to other labelling generally

based on the signal(s) carried by the cable or core
3.16
composite labelling

system of labelling where two or more of the identification labelling, connection labelling and

signal labelling systems are used together
4 Rules
4.1 General requirements

Cables and cores shall be recognizable at each end; it shall be possible to relate cables and

cores to the technical documentation.
This may be carried out by:

• the designation and marking provided by the manufacturer of the cable, see 4.2, or

• an additional labelling, see 4.3.

Additional labelling might be required within larger systems or installations with many cores of

the same colour or with many cables, and where therefore the use only of the designations

provided by the cable or core manufacturer would be ambiguous.
The additional labelling shall be based on one or more of the following:
• the identifier of the cable or core, see Clause 5;
• the connection of the cable or core, see Clause 6, or
• the signal carried by the cable or core, see Clause 7.
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SIST EN 62491:2008
– 10 – 62491 © IEC:2008
4.2 Use of designated cable cores
Cable cores are often designated by the manufacturer applying methods such as:
• coloured insulation of the single cores;

• differently coloured (including multi-coloured) insulation of the cores of the cables, or

• differently numbered cores of cables.

These designations should, to the extent possible, be used for the identification of the cores.

Additional labelling is in such cases normally not required.

The use of such designations shall be described in the documentation of the equipment in

accordance with 7.5 and 9.3 of IEC 61082-1.

For the indication of the colours of cable cores in the documentation, the colour coding of

IEC 60757 shall be applied.

NOTE The colour does not provide any information on where the core is to be connected. The connection

information is in entirety to be found in associated connection table or connection diagram.

Table 1 shows an example of a connection table in which the colours (designated in

accordance with IEC 60757) of the cable cores are used for the identification
Table 1 – Example of connection table in which the cable
cores are identified by means of codes for their colour
Core colour Local end Remote end
GNYE A4X1:PE B4X1:PE
BK A4X1:11 B4X1:33
BN A4X1:17 B4X1:34
RD A4X1:18 B4X1:35
4.3 Use of additional labelling
The additional labelling, where required, shall be one of the following types:
• identification labelling of the cable or core, see Clause 5;
• connection labelling of the cable or core, see Clause 6:
– local-end connection labelling,
– remote-end connection labelling,
– both-end connection labelling;
• signal labelling of the cable or core, see Clause 7.
• Composite labelling, see Clause 8.

The method used shall be specified in the supporting documentation, see Clause 11.

Additional information, for example a reference to a page number of the circuit diagram, may

be added on the label. The use of such additional information shall be explained in the

technical documentation. For an example, see Clause A.5.
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SIST EN 62491:2008
62491 © IEC:2008 – 11 –
5 Identification labelling
5.1 General

The purpose of identification labelling is to show the identifier of the cable or core as a

constituent of the system of which it is a part. The same labelling is valid and may be used all

along a cable or core, even if it has junctions in its run.

The identification labelling does not provide any information on the connection. The

connection information is in its entirety to be found in associated documentation.

NOTE 1 For further information on the preparation of the relevant document types, see IEC 61082-1.

The preferred identifier of a cable or core is a reference designation in accordance with

IEC 81346-1. That standard provides further guidance on how to create unambiguous

reference designations within an installation, system or equipment.

The reference designation can take different forms depending on, in which structure the core

is identified and to which object the core is associated.

NOTE 2 “Cable numbers” are considered as a kind of reference designation. For further information,

see IEC 81346-1.

The reference designation should normally be shown with relevant prefix sign, but this may be

omitted if no ambiguity can arise.

NOTE 3 In the examples of this standard the first prefix sign of the reference designations (even if named

“complete”) has been deliberately omitted in order not to give a reader the impression that a specific one is

required for cables and connections.
EXAMPLE 1:

Cables between terminals belonging to the same object within which cable or core are

identified. See Figure 1 and Table 2. The labels at each end as well as possible intermediate

labels are shown.
• W23 is a single core cable with end labels and an intermediate label;
• W24
...

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