EN IEC 60664-1:2020/prA1:2024

SLOVENSKI STANDARD
01-julij-2024
Koordinacija izolacije za opremo v okviru nizkonapetostnih sistemov - 1. del:
Načela, zahteve in preskusi - Dopolnilo A1
Amendment 1 - Insulation coordination for equipment within low-voltage supply systems
- Part 1: Principles, requirements and tests
Isolationskoordination für Betriebsmittel in Niederspannungs-
Stromversorgungssystemen - Teil 1: Grundsätze, Anforderungen und Prüfungen
Coordination de l'isolement des matériels dans les réseaux d'énergie électrique à basse
tension - Partie 1: Principes, exigences et essais
Ta slovenski standard je istoveten z: EN IEC 60664-1:2020/prA1:2024
ICS:
29.080.30 Izolacijski sistemi Insulation systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

109/229/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 60664-1/AMD1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-05-10 2024-08-02
SUPERSEDES DOCUMENTS:
109/222A/CD, 109/227A/CC
IEC TC 109 : INSULATION CO-ORDINATION FOR LOW-VOLTAGE EQUIPMENT
SECRETARIAT: SECRETARY:
Germany Mr Marco Peter
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 2,TC 8,TC 9,TC 13,SC 17A,SC 17C,TC 22,TC
23,SC 23B,SC 23E,SC 23H,TC 28,TC 31,TC
Other TC/SCs are requested to indicate their interest, if
34,SC 37A,TC 38,TC 42,SC 48B,TC 61,TC 64,TC
any, in this CDV to the secretary.
66,TC 69,TC 70,TC 72,TC 82,TC 88,TC 91,TC
94,TC 96,TC 99,TC 105,TC 108,TC 112,TC
120,TC 121,SC 121A,SC 121B,ACOS,SyC LVDC
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE 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:
Amendment 1 - Insulation coordination for equipment within low-voltage supply systems - Part
1: Principles, requirements and tests

PROPOSED STABILITY DATE: 2025
NOTE FROM TC/SC OFFICERS:
As discussed and decided during the TC 109 plenary meeting 2024.03.14 the CDV document for
comments.
IEC secretariat should update the project plan for IEC 60664-1 AMD1, with the goal to publish by 2025-
download this 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.

2 109/229/CDV
1 INTERNATIONAL ELECTROTECHNICAL COMMISSION
2 ____________
4 INSULATION COORDINATION FOR EQUIPMENT
5 WITHIN LOW-VOLTAGE SUPPLY SYSTEMS –
7 Part 1: Principles, requirements and tests
9 AMENDMENT 1
11 FOREWORD
12 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
13 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
14 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
15 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
16 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
17 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
18 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
19 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
20 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
21 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
22 consensus of opinion on the relevant subjects since each technical committee has representation from all
23 interested IEC National Committees.
24 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
25 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
26 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
27 misinterpretation by any end user.
28 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
29 transparently to the maximum extent possible in their national and regional publications. Any divergence between
30 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
31 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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33 services carried out by independent certification bodies.
34 6) All users should ensure that they have the latest edition of this publication.
35 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
36 members of its technical committees and IEC National Committees for any personal injury, property damage or
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38 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
39 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
40 indispensable for the correct application of this publication.
41 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
42 rights. IEC shall not be held responsible for identifying any or all such patent rights.
43 Amendment 1 to IEC 60664:2020 has been prepared by IEC technical committee 109:
44 Insulation co-ordination for low-voltage equipment.
45 The text of this International Standard is based on the following documents:
FDIS Report on voting
109/XX/XXXX 109/XX/XXX
47 Full information on the voting for the approval of this International Standard can be found in the
48 report on voting indicated in the above table.
49 The language used for the development of this Amendment is English.

3 109/229/CDV
50 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
51 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
52 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
53 described in greater detail at www.iec.ch/standardsdev/publications/.
54 The committee has decided that the contents of this document will remain unchanged until the
55 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
56 specific document. At this date, the document will be
57 reconfirmed,
58 withdrawn,
59 replaced by a revised edition, or
60 amended.
4 109/229/CDV
63 INSULATION COORDINATION FOR EQUIPMENT
64 WITHIN LOW-VOLTAGE SUPPLY SYSTEMS –
66 Part 1: Principles, requirements and tests
68 CONTENTS
69 Replace the existing title to Table F.6 by the following text:
70 Table F.6 – Test voltages for verifying clearances at different altitudes
71 1 Scope
72 Replace the first paragraph with the following:
73 This part of IEC 60664 deals with insulation coordination for electrical equipment having a
74 rated voltage up to AC 1 000 V or DC 1 500 V connected to low-voltage supply systems.
75 NOTE 1 Throughout this document, the term equipment is used with the meaning of electrical equipment.
76 Renumber NOTE 1 and NOTE 2 respectively as NOTE 2 and NOTE 3.
77 Add, at the end of the existing last paragraph, the following NOTE:
78 NOTE 4 Further explanations and examples with regard to the use of this document are provided in IEC TR 60664-
79 2-1.
80 3.1 Terms and definitions
81 Add, at the end of Subclause 3.1, the following new terms:
82 3.1.48
83 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.
84 [SOURCE: IEC 60050-601:1985, 601-01-02]
85 3.1.49
86 electrical installation
87 assembly of electrical equipment which is used for the generation, transmission, conversion,
88 distribution and/or use of electric energy
89 Note 1 to entry: The electrical installation includes energy sources e.g. local power supplies such as batteries,
90 capacitors and all other sources of stored electric energy.
91 [SOURCE: IEC 60050-650: 2014, 651-26-01]
92 3.1.50
93 electrical equipment
94 item used for generation, conversion, transmission, distribution or utilization of electric energy
95 Note 1 to entry: Examples of such items are electric machines, transformers, switchgear and controlgear,
96 measuring instruments, protective devices, wiring systems, current-using equipment.

5 109/229/CDV
97 3.1.51
98 electrochemical migration
99 transport of ions in an electrolyte due to an electric field
100 [SOURCE: IEC 60050-114:2014, 114-04-06]
101 4 Basic technical characteristics for insulation coordination
102 4.2 Voltages
103 4.2.2 Transient overvoltages
104 4.2.2.5 Attenuation of transient overvoltage levels
105 Add after third paragraph the following sentence:
106 Technical committees shall consider the end of life of the means to limit transient overvoltages
107 4.3 Overvoltage categories
108 4.3.2 Equipment energized directly from the mains supply
109 Replace the existing text of subclause 4.3.2 by the following text:
110 Equipment is considered to be energized directly from the mains supply, when the equipment
111 is galvanically connected to an electric power network (either public or private).
112 When defining the rated impulse withstand voltage of equipment, technical committees shall
113 take into account the following overvoltage categories:
114 – Overvoltage category IV applies at, or in the proximity of, the point where an electrical
115 installation is connected to an electric power network.
116 NOTE 1 Equipment of overvoltage category IV has a very high impulse withstand capability providing the
117 required high degree of reliability at these locations, for example upstream of the main distribution board.
118 – Overvoltage category III applies in an electrical installation downstream of and including
119 the main distribution board.
120 NOTE 2 Examples of such equipment include distribution boards, local generation, circuit-breakers, wiring
121 systems ((see IEC 60050-826:2022, 826-15-01), including cables, busbars, junction boxes, switches, socket-
122 outlets) and equipment for industrial use and some other equipment, e.g. stationary motors.
123 – Overvoltage category II applies for equipment connected to an electrical installation.
124 NOTE 3 Examples of such equipment are appliances, portable tools and similar loads with withdrawable or
125 permanent connection to the electrical installation.
126 – Overvoltage category I applies to equipment that may only be connected to an electrical
127 installation when specific measures are provided.
128 NOTE 4 Such specific measures are related to transient overvoltages as well as to temporary overvoltages
129 and are addressed in Error! Reference source not found.
130 Where a higher degree of reliability and availability is needed, equipment having higher rated
131 impulse withstand voltage should be considered (see 5.2.2.2).
6 109/229/CDV
135 Add a new additional subclause:
136 4.3.4 Equipment requiring specific measures
137 When equipment is designed for overvoltage category I and intended to be connected to an
138 electrical installation, all the following measures and verification shall be considered:
139 – the mains supply to which the equipment is intended to be connected, does by design
140 exclude the occurrence of temporary overvoltages with peak values above the rated
141 impulse withstand voltage of the equipment;
142 NOTE For example, in TN-system there are no significant temporary overvoltages exceeding the rated
143 impulse withstand voltage of equipment designed for overvoltage category I.
144 – transient overvoltages are limited to not exceed the rated impulse withstand voltage of
145 the equipment by appropriate means, e.g. SPDs.
146 NOTE Surge Protective Device (SPD) are primarily designed to limit transient overvoltages. However they
147 are also tested with certain temporary overvoltages; for more explanations see IEC 61643 series.
148 – the required impulse withstand voltage at the relevant location is tested and confirmed for
149 the equipment in conjunction with the intended protection means, to ensure not only the
150 withstand voltage, but also the necessary coordination and withstand as related to impulse
151 energy.
152 5 Design
...