oSIST prHD 60364-1:2023

Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions

Errichten von Niederspannungsanlagen - Teil 1: Allgemeine Grundsätze, Bestimmungen allgemeiner Merkmale, Begriffe

Installations électriques à basse tension - Partie 1: Principes fondamentaux, détermination des caractéristiques générales, définitions

Nizkonapetostne električne inštalacije - 1. del: Temeljna načela, ocena splošnih karakteristik, definicije

General Information

• Status: Not Published
• Public Enquiry End Date: 21-Sep-2023
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 05-Jul-2023
• Due Date: 22-Nov-2023
• Ref Project: prHD 60364-1:2023 - Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions

Relations

• Revises: SIST HD 60364-1:2008 - Low-voltage electrical installations -- Part 1: Fundamental principles, assessment of general characteristics, definitions
• Effective Date: 06-Nov-2018
• Revises: SIST HD 60364-1:2008/A11:2017 - Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general characteristics, definitions
• Effective Date: 15-Mar-2022

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prHD 60364-1:2023
01-september-2023
Nizkonapetostne električne inštalacije - 1. del: Temeljna načela, ocena splošnih
karakteristik, definicije
Low-voltage electrical installations - Part 1: Fundamental principles, assessment of
general characteristics, definitions
Errichten von Niederspannungsanlagen - Teil 1: Allgemeine Grundsätze, Bestimmungen
allgemeiner Merkmale, Begriffe
Installations électriques à basse tension - Partie 1: Principes fondamentaux,
détermination des caractéristiques générales, définitions
Ta slovenski standard je istoveten z: prHD 60364-1:2023
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST prHD 60364-1:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prHD 60364-1:2023

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oSIST prHD 60364-1:2023
64/2627/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60364-1 ED6
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-06-30 2023-09-22
SUPERSEDES DOCUMENTS:
64/2626/RR

IEC TC 64 : ELECTRICAL INSTALLATIONS AND PROTECTION AGAINST ELECTRIC SHOCK
SECRETARIAT: SECRETARY:
Germany Mr Wolfgang Niedenzu
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
TC 8,SC 8B,TC 20,TC 22,SC 22H,TC 23,SC
23B,SC 23E,SC 23H,SC 23K,TC 32,SC 32B,TC
Other TC/SCs are requested to indicate their interest, if any, in this
34,SC 37A,TC 61,TC 69,TC 82,TC 85,TC 95,TC
CDV to the secretary.
99,TC 120,TC 121,SC 121A,SC 121B,PC
128,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” clau ses
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:
Low-voltage electrical installations - Part 1: Fundamental principles, assessment of general
characteristics, definitions

Copyright © 2023 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to 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.

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64/2627/CDV – 2 – IEC CDV 60364-1 © IEC 2023
PROPOSED STABILITY DATE: 2030

NOTE FROM TC/SC OFFICERS:

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oSIST prHD 60364-1:2023
IEC CDV 60364-1 © IEC 2023 – 3 – 64/2627/CDV
1 CONTENTS
2 FOREWORD . 7
3 INTRODUCTION . 9
4 1.1 Scope . 10
5 1.2 Normative references . 12
6 1.3 Terms and definitions. 12
7 1.3.1  . 13
8 1.4 Structure of the IEC 60364 series . 13
9 1.5 Fundamental principles . 13
10 1.5.1 Protection for safety . 13
11 1.5.1.1 General . 13
12 1.5.1.2 Protection against electric shock . 14
13 1.5.1.2.1 Basic protection . 14
14 1.5.1.2.2 Fault protection . 14
15 1.5.1.2.3 Additional protection . 14
16 1.5.1.3 Protection against thermal effects . 14
17 1.5.1.4 Protection against overcurrent . 15
18 1.5.1.5 Protection against fault current . 15
19 1.5.1.6 Protection against voltage disturbances . 15
20 1.5.1.7 Protection against power supply interruptions . 15
21 1.5.1.8 Protection against the effects of electromagnetic
22 interference. 15
23 1.5.2 Design . 15
24 1.5.2.1 General . 15
25 1.5.2.2 Power Supplies . 16
26 1.5.2.2.1 Characteristics of power supplies. 16
27 1.5.2.2.2 Electric supply systems for safety services and
28 standby electric supply systems . 16
29 1.5.2.3 Nature of demand . 17
30 1.5.2.4 Environmental conditions . 17
31 1.5.2.5 Cross-sectional area of conductors . 17
32 1.5.2.6 Type of wiring and methods of installation . 18
33 1.5.2.7 Protective equipment . 18
34 1.5.2.8 Emergency switching off . 18
35 1.5.2.9 Isolation . 18
36 1.5.2.10 Functional switching . 18
37 1.5.2.11 Prevention of mutual detrimental influence . 18
38 1.5.2.12 Accessibility of electrical equipment . 19
39 1.5.2.13 Additions and alterations to an installation . 19
40 1.5.2.14 Electrical energy efficiency . 19
41 1.5.2.15 Local production and storage of electrical energy
42 (prosumer) . 19
43 1.5.2.16 Communication means . 19
44 1.5.2.17 Documentation for the electrical installation . 19
45 1.5.2.18 Division of installation . 19
46 1.5.2.19 Signs and notices . 20
47 1.5.3 Selection of electrical equipment . 20
48 1.5.3.1 General . 20
49 1.5.3.2 Characteristics . 20

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50 1.5.3.2.1 General . 20
51 1.5.3.2.2 Voltage . 20
52 1.5.3.2.3 Current . 20
53 1.5.3.2.4 Frequency . 20
54 1.5.3.2.5 Power . 20
55 1.5.3.3 Environmental conditions . 21
56 1.5.3.4 Prevention of harmful effects . 21
57 1.5.3.5 New materials, inventions and innovations . 21
58 1.5.4 Erection and verification of electrical installations . 21
59 1.5.4.1 Erection . 21
60 1.5.4.2 Initial verification . 22
61 1.5.4.3 Periodic verification . 22
62 1.6 Assessment of general characteristics . 22
63 1.7 Purposes, supplies and structure . 22
64 1.7.1 General structure . 22
65 1.7.2 Maximum demand and diversity . 23
66 1.7.3 Conductor arrangement and low voltage electric systems . 23
67 1.7.3.1 General . 23
68 1.7.3.2 Live conductors . 23
69 1.7.3.2.1 Live conductors in AC circuits . 23
70 1.7.3.2.2 Live conductors in DC circuits . 24
71 1.7.3.3 Protective conductors . 25
72 1.7.3.3.1 General . 25
73 1.7.3.3.2 Protective earthing conductors . 25
74 1.7.3.3.2.1 General . 25
75 1.7.3.3.2.2 PEN conductors . 25
76 1.7.3.3.2.3 PEL conductors . 25
77 1.7.3.3.2.4 PEM conductors . 25
78 1.7.3.3.3 Protective bonding conductors . 26
79 1.7.3.3.4 System-referencing-conductors . 26
80 1.7.3.4 Types of electric systems . 26
81 1.7.3.4.1 General . 26
82 1.7.3.4.2 Types of electric systems for AC . 28
83 1.7.3.4.2.1 TN-systems . 28
84 1.7.3.4.2.1.1 General 28
85 1.7.3.4.2.1.2 System with a single source 29
86 1.7.3.4.2.1.3 System with more than one source 30
87 1.7.3.4.2.2 TT system . 33
88 1.7.3.4.2.2.1 General 33
89 1.7.3.4.2.2.2 System with single source 33
90 1.7.3.4.2.2.3 System with more than one source 34
91 1.7.3.4.2.3 IT system . 39
92 1.7.3.4.2.3.1 General 39
93 1.7.3.4.2.3.2 System with more than one source 40
94 1.7.3.4.3 Types of electric systems for DC. 40
95 1.7.3.4.3.1 General . 40
96 1.7.3.4.3.2 TN systems . 40
97 1.7.3.4.3.3 TT-system . 43

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98 1.7.3.4.3.4 IT-system. 45
99 1.8 Compatibility . 46
100 1.8.1 Compatibility of characteristics . 46
101 1.8.2 Electromagnetic compatibility . 47
102 1.9 Maintainability . 47
103 1.10 Safety services . 47
104 1.11 Continuity of service . 48
105 (informative)  Plan of IEC 60364 series . 49
106 A.1 49
107 Bibliography . 51
108
109 Figure 1 – Single-phase 2-wire . 23
110 Figure 2 – Two-phase 3-wire. 23
111 Figure 3 – Three-phase 3-wire . 24
112 Figure 4 – Three-phase 4-wire . 24
113 Figure 5 – 2-wire . 24
114 Figure 6 – 3-wire . 25
115 Figure 7 – Example of an AC TN-S system with separate neutral conductor and
116 protective earthing conductor throughout the system . 29
117 Figure 8 – Example of an AC TN-C-S system with a PEN conductor separated into a
118 protective earthing conductor and a neutral conductor . 30
119 Figure 9 – Example of an AC TN-C-S system with a PEM conductor separated into a
120 protective earthing conductor and a mid-point conductor . 30
121 Figure 10 – Example of an AC TN-S multiple source system with two local sources . 32
122 Figure 11 – Example of an AC TN-C-S multiple source system with one local source
123 and one external source (e.g., public power supply network) . 33
124 Figure 12 – Example of an AC TT system . 34
125 Figure 13 – Example of an AC TT multiple source system with two local sources . 35
126 Figure 14 – Example of an external source in an AC TT supply system with a local
127 source in an installation operating as an IT installation when disconnected from the
128 external source . 37
129 Figure 15 – Example of an external source in an AC TT supply system with a local
130 source in an installation operating as a TT installation when disconnected from the
131 external source . 38
132 Figure 16 – Example of an external source in an AC TT supply system with a local
133 source in an installation operating as an TN installation when disconnected from the
134 external source . 39
135 Figure 17 – Example of an AC IT system with exposed-conductive-parts earthed
136 individually or in groups by protective earthing conductors . 40
137 Figure 18 – Example of a DC TN-S system without mid-point . 40
138 Figure 19 – Example of a DC TN-S system with mid-point . 41
139 Figure 20 – Example of a DC TN-C system without mid-point . 41
140 Figure 21 – Example of a DC TN-C-S system with mid-point . 42
141 Figure 22 – Example of a DC TN-C-S system without mid-point . 42
142 Figure 23 – Example of a DC TN-C-S system with mid-point . 43
143 Figure 24 – Example of a DC TT system without mid-point . 44
144 Figure 25 – Example of a DC TT system with mid-point . 44

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145 Figure 26 – Example of a DC IT system without mid-point. 45
146 Figure 27 – Example of a DC IT system with mid-point . 46
147
148 Table 1 – Types of electric systems considered for AC installations . 27
149 Table 2 – Types of electric systems considered for DC installations . 27
150 Table 3 – Symbols indicating the conductor function . 28
151 Table 4 – Numbering system of IEC 60364 series . 49
152 Table 5 – Plan of IEC 60364 series: Low-voltage electrical installations . 49
153
154

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oSIST prHD 60364-1:2023
IEC CDV 60364-1 © IEC 2023 – 7 – 64/2627/CDV
155 INTERNATIONAL ELECTROTECHNICAL COMMISSION
156 ____________
157
158 LOW-VOLTAGE ELECTRICAL INSTALLATIONS
159
160 Part 1: Fundamental principles, assessment of
161 general characteristics, definitions
162
163 FOREWORD
164 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
165 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
166 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
167 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
168 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
169 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
170 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
171 with the IEC also participate in this preparation. IEC collaborates closely with the Internat ional Organization for
172 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
173 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
174 consensus of opinion on the relevant subjects since each technical committee has representation from all
175 interested IEC National Committees.
176 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
177 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
178 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
179 misinterpretation by any end user.
180 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
181 transparently to the maximum extent possible in their national and regional publications. Any divergence between
182 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
183 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
184 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
185 services carried out by independent certification bodies.
186 6) All users should ensure that they have the latest edition of this publication.
187 7) No liability shall attach to IEC or its directors, employees, servants or agents including in dividual experts and
188 members of its technical committees and IEC National Committees for any personal injury, property damage or
189 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
190 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
191 Publications.
192 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
193 indispensable for the correct application of this publication.
194 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
195 rights. IEC shall not be held responsible for identifying any or all such patent rights.
196 IEC 60364-1 has been prepared by subcommittee TC64 MT1: Terms and definitions, of IEC
197 technical committee TC64: Electrical installations and protection against electric shock.
198 This document addresses fundamental principles, assessment of general characteristics and
199 definitions.
200 This sixth edition cancels and replaces the fifth edition published in 2005. This edition
201 constitutes a technical revision.
202 This edition includes the following significant technical changes with respect to the previous
203 edition:
204 a) The entire Part 1 has been restructured and numbered with reference to current editions of
205 various parts of the IEC 60364 standard;
206 b) The scope has been expanded to include new areas of application and has been
207 restructured;

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208 c) With subclause 1.5.2.2.2, the topic of safety services and standby electric supply systems
209 has been added;
210 d) With subclause 1.5.2.14, the topic of energy efficiency has been included;
211 e) With subclause 1.5.2.15, the topic of prosumer electrical installations has been included;
212 f) With subclause 1.5.3.5 an equivalent safety level is required for the use of new materials
213 and innovations for which no product standards exist yet. This must be verified by a risk
214 assessment;
215 g) With subclause 1.5.4.3 it is required that effectiveness of protective measures for people
216 and livestock safety shall be maintained during the entire lifetime of the installation. This
217 should be done by periodic verification;
218 h) Table 3 shows the symbol for the newly introduced “system-referencing-conductor (SRC)”;
219 i) The number of pictures showing the type of earth connection in AC and DC systems is
220 limited to the most important ones. Since the applications for DC installations have
221 increased significantly, some figures for DC Installations have been added
222 The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
223
224 Full information on the voting for its approval can be found in the report on voting indicated in
225 the above table.
226 The language used for the development of this International Standard is English.
227 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
228 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
229 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
230 described in greater detail at www.iec.ch/publications.
231 The committee has decided that the contents of this document will remain unchanged until the
232 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
233 specific document. At this date, the document will be
234 • reconfirmed,
235 • withdrawn,
236 • replaced by a revised edition, or
237 • amended.
238

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239 INTRODUCTION
240 The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed
241 that compliance with this document may involve the use of a patent. IEC takes no position
242 concerning the evidence, validity, and scope of this patent right.
243 The holder of this patent right has assured IEC that s/he is willing to negotiate licences under
244 reasonable and non-discriminatory terms and conditions with applicants throughout the world.
245 In this respect, the statement of the holder of this patent right is registered with IEC. Information
246 may be obtained from the patent database available at patents.iec.ch/.
247 Attention is drawn to the possibility that some of the elements of this document may be the
248 subject of patent rights other than those in the patent database. IEC shall not be held
249 responsible for identifying any or all such patent rights.
250
251

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252 LOW-VOLTAGE ELECTRICAL INSTALLATIONS
253
254 Part 1: Fundamental principles, assessment of
255 general characteristics, definitions
256
257
258
259 1.1 Scope
260 The International Standards of the IEC 60364 series specifies the rules for the design, erection,
261 and verification of low-voltage electrical installations. The rules are provided for the safety of
262 human beings (persons), livestock and property against dangers and damage which may arise
263 from the intended use of low-voltage electrical installations and for the proper functioning of
264 those installations.
265 Examples: A non-comprehensive list of electrical installations or systems includes:
266 – residential premises;
267 – commercial premises;
268 – public premises;
269 – industrial premises;
270 – agricultural and horticultural premises;
271 – prefabricated buildings;
272 – caravans, caravan sites and similar sites;
273 – construction sites, exhibitions, fairs and other installations for temporary purposes;
274 – marinas;
275 – external lighting and similar installations;
276 – medical locations;
277 – mobile or transportable units;
278 – photovoltaic systems;
279 – stationary secondary batteries;
280 – low-voltage generating sets.
281 NOTE 1 “Premises” covers the land and all facilities including buildings belonging to it.
282 The IEC 60364 series covers
283 – circuits supplied at nominal voltages up to and including 1000 V AC or 1500 V DC; For
284 AC, the preferred frequencies which are taken into account in this standard are 5 0 Hz
285 and 60 Hz. The use of other frequencies is not excluded.
286 – circuits, other than the internal wiring of apparatus, operating at voltages exceeding
287 1000 V AC or 1500 V DC and derived from an installation having a nominal voltage not
288 exceeding 1000 V AC or 1500 V DC, for example, discharge lighting, electrostatic
289 precipitators;
290 – wiring systems and cables not specifically covered by the standards for appliances;
291 – fixed wiring for information and communication technology including power supply,
292 signalling, fibre optic, control and the like (excluding internal wiring of apparatus).

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293 The IEC 60364 series applies to:
294 – alterations and/or extensions of the installation;
295 – parts of the existing installation affected by modifications, extensions or alterations;
296 – the design of functional aspects, such as energy efficiency, local production and storage
297 of energy (prosuming).
298 The IEC 60364 series applies to any kind of low-voltage electrical installation or system, except:
299 j) electric traction equipment, including rolling stock and signalling equipment;
300 k) electrical circuits and equipment for automotive purposes within motor vehicles;
301 l) electrical installations of ships and of mobile and fixed offshore units;
302 m) electrical installations in aircraft;
303 n) public street-lighting instal
...