SIST EN IEC 60664-1:2020/A1:2025
(Amendment)Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests (IEC 60664-1:2020/AMD1:2025)
Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests (IEC 60664-1:2020/AMD1:2025)
Isolationskoordination für Betriebsmittel in Niederspannungs-Stromversorgungssystemen - Teil 1: Grundsätze, Anforderungen und Prüfungen (IEC 60664-1:2020/AMD1:2025)
Coordination de l'isolement des matériels dans les réseaux d'énergie électrique à basse tension - Partie 1: Principes, exigences et essais (IEC 60664-1:2020/AMD1:2025)
Koordinacija izolacije za opremo v okviru nizkonapetostnih sistemov - 1. del: Načela, zahteve in preskusi - Dopolnilo A1 (IEC 60664-1:2020/AMD1:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Koordinacija izolacije za opremo v okviru nizkonapetostnih sistemov - 1. del:
Načela, zahteve in preskusi - Dopolnilo A1 (IEC 60664-1:2020/AMD1:2025)
Insulation coordination for equipment within low-voltage supply systems - Part 1:
Principles, requirements and tests (IEC 60664-1:2020/AMD1:2025)
Isolationskoordination für Betriebsmittel in Niederspannungs-
Stromversorgungssystemen - Teil 1: Grundsätze, Anforderungen und Prüfungen (IEC
60664-1:2020/AMD1:2025)
Coordination de l'isolement des matériels dans les réseaux d'énergie électrique à basse
tension - Partie 1: Principes, exigences et essais (IEC 60664-1:2020/AMD1:2025)
Ta slovenski standard je istoveten z: EN IEC 60664-1:2020/A1:2025
ICS:
29.080.30 Izolacijski sistemi Insulation systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60664-1:2020/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2025
ICS 29.080.30
English Version
Insulation coordination for equipment within low-voltage supply
systems - Part 1: Principles, requirements and tests
(IEC 60664-1:2020/AMD1:2025)
Coordination de l'isolement des matériels dans les réseaux Isolationskoordination für Betriebsmittel in
d'énergie électrique à basse tension - Partie 1: Principes, Niederspannungs-Stromversorgungssystemen - Teil 1:
exigences et essais Grundsätze, Anforderungen und Prüfungen
(IEC 60664-1:2020/AMD1:2025) (IEC 60664-1:2020/AMD1:2025)
This amendment A1 modifies the European Standard EN IEC 60664-1:2020; it was approved by CENELEC on 2025-06-10. 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,
Türkiye 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60664-1:2020/A1:2025 E
European foreword
The text of document 109/235/FDIS, future edition 3 of IEC 60664-1/AMD1, prepared by TC 109
"Insulation co-ordination for low-voltage equipment" was submitted to the IEC-CENELEC parallel vote
and approved by CENELEC as EN IEC 60664-1:2020/A1:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-06-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-06-30
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 60664-1:2020/AMD1:2025 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 standard indicated:
IEC 61643 (series) NOTE Approved as EN IEC 61643 (series)
IEC 60364-1 NOTE Approved as HD 60364-1
IEC 60664-1 ®
Edition 3.0 2025-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
AMENDEMENT 1
AMENDEMENT 1
Insulation coordination for equipment within low-voltage supply systems –
Part 1: Principles, requirements and tests
Coordination de l'isolement des matériels dans les réseaux d'énergie électrique
à basse tension –
Partie 1: Principes, exigences et essais
ICS 29.080.30 ISBN 978-2-8327-0344-1
IEC 60664-1:2020-05/AMD1:2025-05(en-fr)
– 2 – IEC 60664-1:2020/AMD1:2025
© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATION COORDINATION FOR EQUIPMENT
WITHIN LOW-VOLTAGE SUPPLY SYSTEMS –
Part 1: Principles, requirements and tests
AMENDMENT 1
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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). [IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch [and/or]
www.iso.org/patents. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60664:2020 has been prepared by IEC technical committee 109:
Insulation co-ordination for low-voltage equipment.
The text of this Amendment is based on the following documents:
Draft Report on voting
109/235/FDIS 109/240/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
IEC 60664-1:2020/AMD1:2025 – 3 –
© IEC 2025
The language used for the development of this Amendment 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/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
___________
Throughout the document (except in the Bibliography), delete:
IEC 60364-4-44:2007
and replace with:
IEC 60364-4-44:2024.
1 Scope
Replace the first paragraph with the following:
This part of IEC 60664 deals with insulation coordination for electrical equipment having a
rated voltage up to AC 1 000 V or DC 1 500 V connected to low-voltage supply systems.
NOTE 1 Throughout this document, the term equipment is used with the meaning of electrical equipment.
Renumber NOTE 1 and NOTE 2 respectively as NOTE 2 and NOTE 3.
Add, at the end of the existing last paragraph, the following NOTE:
NOTE 4 Further explanations and examples with regard to the use of this document are provided in
IEC TR 60664-2-1.
– 4 – IEC 60664-1:2020/AMD1:2025
© IEC 2025
3.1 Terms and definitions
Add the following new terms:
3.1.48
electric power network
particular installations, substations, lines or cables for the transmission and distribution of
electricity
Note 1 to entry: The boundaries of the different parts of this network are defined by appropriate criteria, such as
geographical situation, ownership, voltage, etc.
[SOURCE: IEC 60050-601:1985, 601-01-02]
3.1.49
electrical installation
assembly of electrical equipment which is used for the generation, transmission, conversion,
distribution and/or use of electric energy
Note 1 to entry: The electrical installation includes energy sources e.g. local power supplies such as batteries,
capacitors and all other sources of stored electric energy.
[SOURCE: IEC 60050-651:2014, 651-26-01, modified – "e.g. local power supplies" has been
added to the Note to entry.]
3.1.50
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, and current-using equipment.
[SOURCE: IEC 60050-826:2022, 826-16-01]
3.1.51
electrochemical migration
transport of ions in an electrolyte due to an electric field
[SOURCE: IEC 60050-114:2014, 114-04-06]
4.2.2.5 Attenuation of transient overvoltage levels
Add, after third paragraph, the following:
Technical committees shall consider the end of life of the means to limit transient overvoltages.
4.3.2 Equipment energized directly from the mains supply
Replace the existing text of 4.3.2 with the following:
Equipment is considered to be energized directly from the mains supply when the equipment
is galvanically connected to an electric power network (either public or private).
IEC 60664-1:2020/AMD1:2025 – 5 –
© IEC 2025
When defining the rated impulse withstand voltage of equipment, technical committees shall
take into account the following overvoltage categories:
– Overvoltage category IV applies at, or in the proximity of, the point where an electrical
installation is connected to an electric power network.
NOTE 1 Equipment of overvoltage category IV has a very high impulse withstand capability providing the
required high degree of reliability at these locations, for example upstream of the main distribution board.
– Overvoltage category III applies in an electrical installation downstream of and including
the main distribution board.
NOTE 2 Examples of such equipment include distribution boards, local generation, circuit-breakers, wiring
systems (see IEC 60050-826:2022, 826-15-01), including cables, busbars, junction boxes, switches, socket-
outlets) and equipment for industrial use and some other equipment, e.g. stationary motors.
– Overvoltage category II applies for equipment connected to an electrical installation.
NOTE 3 Examples of such equipment are appliances, portable tools and similar loads with pluggable or
permanent connection to the electrical installation.
– Overvoltage category I applies to equipment that may only be connected to an electrical
installation when specific measures are provided.
NOTE 4 Such specific measures are related to transient overvoltages as well as to temporary overv
...
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