EN 61666:2010/A1:2021

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

No scope available

Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Identifikation von Anschlüssen in Systemen

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

Industrijski sistemi, inštalacije, oprema in industrijski izdelki - Identifikacija (označevanje) priključkov v sistemu (IEC 61666:2010/A1:2021)

General Information

• Status: Published
• Publication Date: 05-Aug-2021
• ICS: 01.080.30 - Graphical symbols for use on mechanical engineering and construction drawings, diagrams, plans, maps and in relevant technical product documentation
• Technical Committee: CLC/SR 3 - Information structures, documentation and graphical symbols
• Drafting Committee: IEC/TC 3 - IEC_TC_3
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 06-Aug-2021
• Completion Date: 06-Aug-2021
• Ref Project: SIST EN 61666:2010/A1:2021 - Industrial systems, installations and equipment and industrial products - Identification of terminals within a system (IEC 61666:2010/A1:2021)

Relations

• Amends: EN 61666:2010 - Industrial systems, installations and equipment and industrial products - Identification of terminals within a system
• Effective Date: 03-Mar-2020

Overview

EN 61666:2010/A1:2021 is a European standard developed by CLC (European Committee for Electrotechnical Standardization, CENELEC) for the identification of terminals within industrial systems, installations, equipment, and industrial products. Originating from IEC 61666:2010/A1:2021, this amendment standardizes how terminals are marked and referenced, supporting clear and unambiguous communication in electrical and electronic engineering. By implementing EN 61666 and its amendment, companies can improve safety, maintenance efficiency, and product lifecycle management through consistent terminal identification.

Key Topics

• Terminal Identification Systems: The standard outlines approaches for consistently identifying and labelling terminals within complex industrial setups, ensuring clarity in diagrams, schematics, and technical documentation.
• Graphical Symbols: It aligns with international practices for graphical symbols on engineering drawings, charts, and product documentation, supporting universal understanding.
• Reference Designations: EN 61666 sets guidance for both single-level and multi-level reference designations, making it easier to manage and modify systems throughout their lifecycle.
• Practical Examples: The amendment clarifies designation principles using updated examples (such as three-phase motors and functional diagrams), highlighting best practices for applying terminal identifications in real-world designs.

Applications

The proper identification of terminals, as defined in EN 61666:2010/A1:2021, is critical across various industrial sectors. Key applications include:

• Industrial Automation and Control: Enhances troubleshooting, maintenance, and upgrades in automated production lines by providing clear wiring identification and documentation.
• Manufacturing: Ensures consistent terminal labeling in electrical cabinets, machinery, and product components, minimizing wiring errors and ensuring compliance with international and customer-specific requirements.
• Facility Management: Supports operation and maintenance of electrical installations in factories, utilities, and infrastructure, enabling accurate mapping and diagnostics.
• Engineering Design: Facilitates clear communication among engineers, installers, and inspectors by referencing standardized terminal codes and graphical symbols in technical drawings and product documentation.
• Product Lifecycle Management: Streamlines retrofitting, expansion, and replacement of systems by ensuring legacy and new installations use compatible identification schemes.

Implementing this standard supports not only compliance with European regulations but also promotes best practices for workplace safety, equipment reliability, and interoperability of products across markets.

Related Standards

EN 61666:2010/A1:2021 complements and is typically used in conjunction with several other European and international industrial standards:

• IEC 61666: The foundational international standard for terminal identification, on which the European standard is based.
• EN IEC 61082-1: Focuses on preparation of documents used in electrotechnology, including diagrams and layouts that integrate terminal identification.
• EN 81346-1 / -2: Provides rules for structuring reference designations and object-oriented marking in industrial systems.
• EN 60445 / EN 60446: Related to basic and safety principles for marking and identification of electrical equipment terminals and conductor colors.
• ISO 14617: Addresses graphical symbols for diagrams.

These related standards ensure cohesive application of identification, documentation, and symbol usage across the electrical and electronic engineering disciplines.

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By adhering to EN 61666:2010/A1:2021, professionals in electrical and industrial engineering benefit from improved clarity in system documentation, enhanced product safety, and streamlined operations at every stage of the system life cycle.

Keywords: terminal identification, EN 61666, IEC 61666, electrical engineering, industrial systems, graphical symbols, reference designations, CENELEC, industrial equipment, technical documentation, maintenance efficiency, standardization.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2021
Industrijski sistemi, inštalacije, oprema in industrijski izdelki - Identifikacija
(označevanje) priključkov v sistemu (IEC 61666:2010/A1:2021)
Industrial systems, installations and equipment and industrial products - Identification of
terminals within a system (IEC 61666:2010/A1:2021)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Identifikation
von Anschlüssen in Systemen (IEC 61666:2010/A1:2021)
Systèmes industriels, installations et appareils, et produits industriels - Identification des
bornes dans le cadre d'un système (IEC 61666:2010/A1:2021)
Ta slovenski standard je istoveten z: EN 61666:2010/A1:2021
ICS:
01.080.40 Grafični simboli za uporabo v Graphical symbols for use on
risbah, diagramih, načrtih v electrical and electronics
elektrotehniki in elektroniki engineering drawings,
ter v ustrezni tehnični diagrams, charts and in
proizvodni dokumentaciji relevant technical product
documentation
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 61666:2010/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS 01.080.30
English Version
Industrial systems, installations and equipment and industrial
products - Identification of terminals within a system
(IEC 61666:2010/A1:2021)
Systèmes industriels, installations et appareils, et produits Industrielle Systeme, Anlagen und Ausrüstungen und
industriels - Identification des bornes dans le cadre d'un Industrieprodukte - Identifikation von Anschlüssen in
système Systemen
(IEC 61666:2010/A1:2021) (IEC 61666:2010/A1:2021)
This amendment A1 modifies the European Standard EN 61666:2010; it was approved by CENELEC on 2021-07-21. CENELEC members
are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment 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 amendment 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 61666:2010/A1:2021 E

European foreword
The text of document 3/1487/FDIS, future IEC 61666/A1, 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 61666:2010/A1:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2022–04–21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024–07–21
document have to be withdrawn
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 61666:2010/A1:2021 was approved by CENELEC as a
European Standard without any modification.

IEC 61666 ®
Edition 2.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
H ORIZONTAL PUBLICATION
P UBLICATION HORIZONTALE
AMENDMENT 1
AMENDEMENT 1
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
INTERNATIONALE
ICS 01.080.30 ISBN 978-2-8322-9884-8

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