SIST EN 61666:2010

SLOVENSKI STANDARD
SIST EN 61666:2010
01-november-2010
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SIST EN 61666:1997
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Industrial systems, installations and equipment and industrial products - Identification of
terminals within a system (IEC 61666:2010)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Identifikation
von Anschlüssen in Systemen (IEC 61666:2010)
Systèmes industriels, installations et appareils, et produits industriels - Indentification des
bornes dans le cadre d'un système (CEI 61666:2010)
Ta slovenski standard je istoveten z: EN 61666:2010
ICS:
01.080.40 *UDILþQLVLPEROL]DXSRUDERY Graphical symbols for use on
ULVEDKGLDJUDPLKQDþUWLKY electrical and electronics
HOHNWURWHKQLNLLQHOHNWURQLNL engineering drawings,
WHUYXVWUH]QLWHKQLþQL diagrams, charts and in
SURL]YRGQLGRNXPHQWDFLML relevant technical product
documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN 61666:2010 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61666:2010

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SIST EN 61666:2010

EUROPEAN STANDARD
EN 61666

NORME EUROPÉENNE
September 2010
EUROPÄISCHE NORM

ICS 01.080.30 Supersedes EN 61666:1997


English version


Industrial systems, installations and equipment and industrial products -
Identification of terminals within a system
(IEC 61666:2010)


Systèmes industriels, installations  Industrielle Systeme, Anlagen
et appareils, et produits industriels - und Ausrüstungen und Industrieprodukte -
Identification des bornes dans le cadre Identifikation von Anschlüssen
d'un système in Systemen
(CEI 61666:2010) (IEC 61666:2010)




This European Standard was approved by CENELEC on 2010-09-01. 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 61666:2010 E

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SIST EN 61666:2010
EN 61666:2010 - 2 -
Foreword
The text of document 3/1001/FDIS, future edition 2 of IEC 61666, 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 61666 on 2010-09-01.
This European Standard supersedes EN 61666:1997.
This European Standard includes the following substantial changes with respect to EN 61666:1997:
– the terminology used in the publication has been adapted to the one used in EN 81346-1;
– a more comprehensive description of the designation principles is provided;
– additional examples illustrating terminal designations related to the function aspect and location
aspect are provided;
– an additional example illustrating the use of terminal designation sets is provided;
– the former informative Annex A has been turned into a clause in the standard.
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
(dop) 2011-06-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2013-09-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61666:2010 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 60034-8:2007 NOTE  Harmonized as EN 60034-8:2007 (not modified).
IEC 60191-3:1999 NOTE  Harmonized as EN 60191-3:1999 (not modified).
__________

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SIST EN 61666:2010
- 3 - EN 61666:2010
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 60445 - Basic and safety principles for man-machine EN 60445 -
interface, marking and identification -
Identification of equipment terminals,
conductor terminations and conductors


IEC 60757 - Code for designation of colours HD 457 -


IEC 61082-1 2006 Preparation of documents used in EN 61082-1 2006
electrotechnology -
Part 1: Basic rules


IEC 81346-1 - Industrial systems, installations and EN 81346-1 -
equipment and industrial products -
Structuring principles and reference
designations -
Part 1: Rules


IEC 81714-3 - Design of graphical symbols for use in the - -
technical documentation of products -
Part 3: Classification of connect nodes,
networks and their encoding

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SIST EN 61666:2010

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SIST EN 61666:2010
IEC 61666
®
Edition 2.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial systems, installations and equipment and industrial products –
Identification of terminals within a system

Systèmes industriels, installations et appareils, et produits industriels –
Identification des bornes dans le cadre d’un système

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
P
CODE PRIX
ICS 01.080.30 ISBN 978-2-88912-148-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61666:2010
– 2 – 61666 © IEC:2010
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 Terminal designation .7
4.1 General .7
4.2 Designation of terminals with respect to the product aspect.8
4.3 Designation of terminals with respect to the function aspect .9
4.4 Designation of terminals with respect to the location aspect .10
4.5 Terminal designation set .11
5 Classification of terminals.13
Annex A (informative) Examples of terminal designations not specified by a
manufacturer .14
Bibliography.16

Figure 1 – Principle of terminal designation .7
Figure 2 – Example of designation of terminals for a 3-phase squirrel-cage motor .9
Figure 3 – A device shown with function labels on which the terminal designations
related to the function aspect are based, as well as terminal designations (pins) related
to the product aspect .10
Figure 4 – Example of a symbol for a motor starter provided with terminal designations
related to the function aspect.10
Figure 5 – Example of a terminal board for cross-connection where the terminals are
designated related to their location aspect .11
Figure 6 – Example of a terminal designation set.12
Figure 7 – Example of a design with terminal designations related to the function
aspect.12
Figure 8 – Example of an implemented design based on Figure 7 with terminal
designations related to the product aspect.13
Figure 9 – Example of an implemented design based on Figure 7 with terminal
designation sets related to the function and product aspects .13
Figure A.1 – Four terminal blocks composing one terminal assembly (each terminal
14
block is considered as an object) .
Figure A.2 – One terminal block with eight terminals (the complete unit is an object) .15
Figure A.3 – One terminal block with eight terminals with two entry points each .15

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SIST EN 61666:2010
61666 © IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
IDENTIFICATION OF TERMINALS WITHIN A SYSTEM


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 61666 has been prepared by IEC technical committee 3:
Information structures, documentation and graphical symbols
This second edition cancels and replaces the first edition of IEC 61666 published in 1997.
This edition constitutes a technical revision.
This edition includes the following substantial changes with respect to the previous edition:
• the terminology used in the publication has been adapted to the one used in IEC 81346-1
Ed. 2;
• a more comprehensive description of the designation principles is provided;
• additional examples illustrating terminal designations related to the function aspect and
location aspect are provided;
• an additional example illustrating the use of terminal designation sets is provided;
• the former informative Annex A has been turned into a clause in the standard.

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SIST EN 61666:2010
– 4 – 61666 © IEC:2010
The text of this standard is based on the following documents:
FDIS Report on voting
3/1001/FDIS 3/1008/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 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.

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SIST EN 61666:2010
61666 © IEC:2010 – 5 –
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
IDENTIFICATION OF TERMINALS WITHIN A SYSTEM



1 Scope
This International Standard establishes general principles for the identification of terminals of
objects within a system, applicable to all technical areas (for example mechanical
engineering, electrical engineering, construction engineering, process engineering). They can
be used for systems based on different technologies or for systems combining several
technologies.
Requirements for marking of terminal designations on products are not part of this publication.
NOTE The standard is based on the general principles for the structuring of systems including structuring of the
information about systems, established in the International Standard ISO/IEC 81346 series, published jointly by
IEC and ISO.
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 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: Basic rules
IEC 81346-1, Industrial systems, installations and equipment and industrial products –
Structuring principles and reference designations – Part 1: Rules
IEC 81714-3, Design of graphical symbols for use in the technical documentation of products
– Part 3: Classification of connect nodes, networks and their encoding
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
object
entity treated in a process of development, implementation, usage and disposa
...