IEC 61439-4:2023
(Main)Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
IEC 61439-4:2023 defines the specific requirements of ACS as follows:
- assemblies for which the rated voltage does not exceed 1 000 V in case of AC or 1 500 V in case of DC;
- assemblies where the nominal primary voltage and the nominal secondary voltage of transformers incorporated in ACS are within the limits specified above;
- assemblies intended for use on construction sites, both indoors and outdoors, i.e. temporary places of work to which the public do not generally have access and where building construction, installation, repairs, alteration or demolition of property (buildings) or civil engineering (public works) or excavation or any other similar operations are carried out;
- transportable (semi-fixed) or mobile ASSEMBLIES with enclosure.
This second edition of IEC 61439-4 cancels and replaces the first edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) alignment with IEC 61439-1:2020 regarding the structure and technical content, as applicable.
Ensembles d'appareillage à basse tension - Partie 4 : Exigences particulières pour ensembles de chantiers (EC)
L'IEC 61439-4:2023 définit les exigences particulières des EC comme suit:
- ensembles dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu;
- ensembles dont les valeurs nominales des tensions primaire et secondaire des transformateurs incorporés dans les EC se situent dans les limites spécifiées ci-dessus;
- ensembles destinés à être utilisés sur des chantiers, à l'intérieur comme à l'extérieur, c'est‑à‑dire des lieux de travail temporaires qui ne sont généralement pas accessibles au public et où sont exécutés des travaux de construction, d'installation, de réparation, de modification ou de démolition d'immeubles (bâtiments) ou d'ouvrage de génie civil (travaux publics) ou encore des travaux de terrassement ou tout autre travail analogue;
- ensembles de type transportable (semi-fixe) ou mobile avec enveloppe.
Cette deuxième édition de l'IEC 61439-4 annule et remplace la première édition parue en 2012. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) alignement sur l'IEC 61439-1:2020 en ce qui concerne la structure et le contenu technique, selon le cas.
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IEC 61439-4 ®
Edition 2.0 2023-10
REDLINE VERSION
INTERNATIONAL
STANDARD
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Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
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IEC 61439-4 ®
Edition 2.0 2023-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-7708-9
– 2 – IEC 61439-4:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviations . 9
5 Interface characteristics. 9
6 Information . 10
7 Service conditions . 11
8 Constructional requirements . 12
9 Performance requirements. 14
10 Design verification . 15
11 Routine verification . 17
Annexes . 21
Annex C (informative) User information template . 22
Annex D (informative) Design verification . 26
Annex O L (informative) Guidance on verification of temperature-rise verification . 27
Annex P M (normative) Verification of the short-circuit withstand strength of BUSBAR
structures by comparison with a tested reference design by calculation . 28
Annex AA N (informative) List of notes concerning certain countries . 29
Annex BB (Void) .
Annex CC (informative) Items subject to agreement between the ASSEMBLY
manufacturer and the user .
Bibliography . 35
Figure 101 – Impact test using striking element . 16
Table 101 – Values of assumed loading . 20
Table C.1 – Items subject to agreement between the assembly manufacturer
and the user . 22
Table D.1 – List of design verifications to be performed . 26
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –
Part 4: Particular requirements for assemblies
for construction sites (ACS)
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,
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
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6) All users should ensure that they have the latest edition of this publication.
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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. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 61439-4:2012. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 4 – IEC 61439-4:2023 RLV © IEC 2023
IEC 61439-4 has been prepared by subcommittee 121B: Low-voltage switchgear and
controlgear assemblies, of IEC technical committee 121: Switchgear and controlgear and their
assemblies for low voltage. It is an International Standard.
This second edition of IEC 61439-4 cancels and replaces the first edition published in 2012.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 61439-1:2020 regarding the structure and technical content, as
applicable.
The text of this document is based on the following documents:
Draft Report on voting
121B/183/FDIS 121B/188/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard 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.
This document is to be read in conjunction with IEC 61439-1:2020. The provisions of the general
rules dealt with in IEC 61439-1:2020 are only applicable to this document insofar as they are
specifically cited. When this document states “addition”, “modification” or “replacement”, the
relevant text in IEC 61439-1:2020 is to be adapted accordingly.
Subclauses that are numbered with a 101 (102, 103, etc.) suffix are additional to the same
subclause in IEC 61439-1:2020.
Tables and figures in this document that are new are numbered starting with 101.
New annexes in this document are lettered AA, BB, etc.
In this document, terms written in small capitals are defined in Clause 3.
The reader’s attention is drawn to the fact that Annex N lists all of the “in-some-country” clauses
on differing practices of a less permanent nature relating to the subject of this document.
A list of all parts of the IEC 61439 series, under the general title Low-voltage switchgear and
controlgear assemblies, can be found on the IEC website.
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
– 6 – IEC 61439-4:2023 RLV © IEC 2023
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –
Part 4: Particular requirements for assemblies
for construction sites (ACS)
1 Scope
NOTE Throughout this document, the abbreviation ACS (assembly for construction site, see 3.1.101) is used for a
low-voltage switchgear and controlgear assembly intended for use on construction and similar sites.
This document defines the specific requirements of ACS as follows:
– assemblies for which the rated voltage does not exceed 1 000 V in case of AC or 1 500 V
in case of DC;
– assemblies where the nominal primary voltage and the nominal secondary voltage of
transformers incorporated in ACS are within the limits specified above;
– assemblies intended for use on construction sites, both indoors and outdoors, i.e. temporary
places of work to which the public do not generally have access and where building
construc
...
IEC 61439-4 ®
Edition 2.0 2023-10
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 61439-4:2023 includes the content of the references made to
IEC 61439-1:2020
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 61439-4 ®
Edition 2.0 2023-10
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 61439-4:2023 includes the content of the references made to
IEC 61439-1:2020
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-7709-6
– 2 – IEC 61439-4:2023 EXV © IEC 2023
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms and definitions . 15
3.1 General terms . 16
3.2 Constructional units of assemblies . 18
3.3 External design of assemblies . 19
3.4 Structural parts of assemblies . 20
3.5 Conditions of installation of assemblies . 22
3.6 Insulation characteristics . 22
3.7 Protection against electric shock . 25
3.8 Characteristics . 29
3.9 Verification . 33
3.10 Manufacturer . 33
3.101 Function of the ACS . 34
4 Symbols and abbreviations . 34
5 Interface characteristics . 35
5.1 General . 35
5.2 Voltage ratings . 35
5.2.1 Rated voltage (U ) (of the assembly) . 35
n
5.2.2 Rated operational voltage (U ) (of a circuit of an assembly) . 36
e
5.2.3 Rated insulation voltage (U ) (of a circuit of an assembly) . 36
i
5.2.4 Rated impulse withstand voltage (U ) (of the assembly) . 36
imp
5.3 Current ratings . 36
5.3.1 Rated current of an ACS (I ) . 36
nA
5.3.2 Rated current of a main outgoing circuit (I ) . 36
nc
5.3.3 Group rated current of a main circuit (I ) . 37
ng
5.3.4 Rated peak withstand current (I ) . 37
pk
5.3.5 Rated short-time withstand current (I ) (of a main circuit of an
cw
assembly) . 37
5.3.6 Rated conditional short-circuit current (I ) (of an assembly or a circuit
cc
of an assembly) . 38
5.4 Rated diversity factor (RDF) . 38
5.5 Rated frequency (f ) . 38
n
5.6 Other characteristics . 38
6 Information . 39
6.1 ACS designation marking . 39
6.2 Documentation . 39
6.2.1 Information relating to the ACS . 39
6.2.2 Instructions for handling, installation, operation and maintenance . 40
6.3 Device and/or component identification . 41
7 Service conditions . 41
7.1 Normal service conditions . 41
7.1.1 Climatic conditions . 41
7.1.2 Pollution degree . 41
7.2 Special service conditions . 42
7.3 Conditions during transport, storage and installation . 42
8 Constructional requirements . 42
8.1 Strength of materials and parts . 42
8.1.1 General . 42
8.1.2 Protection against corrosion . 43
8.1.3 Properties of insulating materials . 43
8.1.4 Resistance to ultra-violet (UV) radiation . 44
8.1.5 Mechanical strength . 44
8.1.6 Lifting provision . 44
8.2 Degree of protection provided by an assembly enclosure . 44
8.2.1 Protection against mechanical impact (IK code) . 44
8.2.2 Protection against contact with live parts, ingress of solid foreign bodies
and water (IP code) . 45
8.2.3 Assembly with removable parts. 45
8.3 Clearances and creepage distances. 45
8.3.1 General . 45
8.3.2 Clearances . 46
8.3.3 Creepage distances . 46
8.4 Protection against electric shock . 47
8.4.1 General . 47
8.4.2 Basic protection . 47
8.4.3 Fault protection . 48
8.4.4 Additional requirements for class II assemblies . 51
8.4.5 Limitation of steady-state touch currents and charge . 51
8.4.6 Operating and servicing conditions . 52
8.5 Incorporation of switching devices and components . 52
8.5.1 Fixed parts . 52
8.5.2 Removable parts . 52
8.5.3 Selection of switching devices and components . 52
8.5.4 Installation of switching devices and components . 53
8.5.5 Accessibility . 53
8.5.6 Barriers . 53
8.5.7 Direction of operation and indication of switching positions . 54
8.5.8 Indicator lights and push-buttons . 54
8.5.9 Power factor correction banks . 54
8.5.101 Accessible parts of ACS . 54
8.6 Internal electrical circuits and connections . 54
8.6.1 Main circuits . 54
8.6.2 Auxiliary circuits . 55
8.6.3 Bare and insulated conductors . 55
8.6.4 Selection and installation of non-protected live conductors to reduce the
possibility of short-circuits . 56
8.6.5 Identification of the conductors of main and auxiliary circuits . 56
8.6.6 Identification of the protective conductor (PE, PEL, PEM, PEN) and of
the neutral conductor (N) and the mid-point conductor (M) of the main
circuits . 56
8.6.7 Conductors in AC circuits passing through ferromagnetic enclosures or
plates . 57
8.7 Cooling . 57
– 4 – IEC 61439-4:2023 EXV © IEC 2023
8.8 Terminals for external cables . 57
8.101 Supports and securing devices of ACS . 58
8.102 Cable outle
...
IEC 61439-4 ®
Edition 2.0 2023-10
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 61439-4:2023 includes the content of the references made to
IEC 61439-1:2020
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 61439-4 ®
Edition 2.0 2023-10
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 61439-4:2023 includes the content of the references made to
IEC 61439-1:2020
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-7709-6
– 2 – IEC 61439-4:2023 EXV © IEC 2023
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 12
3 Terms and definitions . 15
3.1 General terms . 16
3.2 Constructional units of assemblies . 18
3.3 External design of assemblies . 19
3.4 Structural parts of assemblies . 20
3.5 Conditions of installation of assemblies . 22
3.6 Insulation characteristics . 22
3.7 Protection against electric shock . 25
3.8 Characteristics . 29
3.9 Verification . 33
3.10 Manufacturer . 33
3.101 Function of the ACS . 34
4 Symbols and abbreviations . 34
5 Interface characteristics . 35
5.1 General . 35
5.2 Voltage ratings . 35
5.2.1 Rated voltage (U ) (of the assembly) . 35
n
5.2.2 Rated operational voltage (U ) (of a circuit of an assembly) . 36
e
5.2.3 Rated insulation voltage (U ) (of a circuit of an assembly) . 36
i
5.2.4 Rated impulse withstand voltage (U ) (of the assembly) . 36
imp
5.3 Current ratings . 36
5.3.1 Rated current of an ACS (I ) . 36
nA
5.3.2 Rated current of a main outgoing circuit (I ) . 36
nc
5.3.3 Group rated current of a main circuit (I ) . 37
ng
5.3.4 Rated peak withstand current (I ) . 37
pk
5.3.5 Rated short-time withstand current (I ) (of a main circuit of an
cw
assembly) . 37
5.3.6 Rated conditional short-circuit current (I ) (of an assembly or a circuit
cc
of an assembly) . 38
5.4 Rated diversity factor (RDF) . 38
5.5 Rated frequency (f ) . 38
n
5.6 Other characteristics . 38
6 Information . 39
6.1 ACS designation marking . 39
6.2 Documentation . 39
6.2.1 Information relating to the ACS . 39
6.2.2 Instructions for handling, installation, operation and maintenance . 40
6.3 Device and/or component identification . 41
7 Service conditions . 41
7.1 Normal service conditions . 41
7.1.1 Climatic conditions . 41
7.1.2 Pollution degree . 41
7.2 Special service conditions . 42
7.3 Conditions during transport, storage and installation . 42
8 Constructional requirements . 42
8.1 Strength of materials and parts . 42
8.1.1 General . 42
8.1.2 Protection against corrosion . 43
8.1.3 Properties of insulating materials . 43
8.1.4 Resistance to ultra-violet (UV) radiation . 44
8.1.5 Mechanical strength . 44
8.1.6 Lifting provision . 44
8.2 Degree of protection provided by an assembly enclosure . 44
8.2.1 Protection against mechanical impact (IK code) . 44
8.2.2 Protection against contact with live parts, ingress of solid foreign bodies
and water (IP code) . 45
8.2.3 Assembly with removable parts. 45
8.3 Clearances and creepage distances. 45
8.3.1 General . 45
8.3.2 Clearances . 46
8.3.3 Creepage distances . 46
8.4 Protection against electric shock . 47
8.4.1 General . 47
8.4.2 Basic protection . 47
8.4.3 Fault protection . 48
8.4.4 Additional requirements for class II assemblies . 51
8.4.5 Limitation of steady-state touch currents and charge . 51
8.4.6 Operating and servicing conditions . 52
8.5 Incorporation of switching devices and components . 52
8.5.1 Fixed parts . 52
8.5.2 Removable parts . 52
8.5.3 Selection of switching devices and components . 52
8.5.4 Installation of switching devices and components . 53
8.5.5 Accessibility . 53
8.5.6 Barriers . 53
8.5.7 Direction of operation and indication of switching positions . 54
8.5.8 Indicator lights and push-buttons . 54
8.5.9 Power factor correction banks . 54
8.5.101 Accessible parts of ACS . 54
8.6 Internal electrical circuits and connections . 54
8.6.1 Main circuits . 54
8.6.2 Auxiliary circuits . 55
8.6.3 Bare and insulated conductors . 55
8.6.4 Selection and installation of non-protected live conductors to reduce the
possibility of short-circuits . 56
8.6.5 Identification of the conductors of main and auxiliary circuits . 56
8.6.6 Identification of the protective conductor (PE, PEL, PEM, PEN) and of
the neutral conductor (N) and the mid-point conductor (M) of the main
circuits . 56
8.6.7 Conductors in AC circuits passing through ferromagnetic enclosures or
plates . 57
8.7 Cooling . 57
– 4 – IEC 61439-4:2023 EXV © IEC 2023
8.8 Terminals for external cables . 57
8.101 Supports and securing devices of ACS . 58
8.102 Cable outle
...
IEC 61439-4 ®
Edition 2.0 2023-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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IEC 61439-4 ®
Edition 2.0 2023-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-7708-9
– 2 – IEC 61439-4:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 3
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviations . 9
5 Interface characteristics. 9
6 Information . 10
7 Service conditions . 11
8 Constructional requirements . 12
9 Performance requirements. 14
10 Design verification . 15
11 Routine verification . 17
Annexes . 21
Annex C (informative) User information template . 22
Annex D (informative) Design verification . 26
Annex O L (informative) Guidance on verification of temperature-rise verification . 27
Annex P M (normative) Verification of the short-circuit withstand strength of BUSBAR
structures by comparison with a tested reference design by calculation . 28
Annex AA N (informative) List of notes concerning certain countries . 29
Annex BB (Void) .
Annex CC (informative) Items subject to agreement between the ASSEMBLY
manufacturer and the user .
Bibliography . 35
Figure 101 – Impact test using striking element . 16
Table 101 – Values of assumed loading . 20
Table C.1 – Items subject to agreement between the assembly manufacturer
and the user . 22
Table D.1 – List of design verifications to be performed . 26
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –
Part 4: Particular requirements for assemblies
for construction sites (ACS)
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. IEC
shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 61439-4:2012. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
– 4 – IEC 61439-4:2023 RLV © IEC 2023
IEC 61439-4 has been prepared by subcommittee 121B: Low-voltage switchgear and
controlgear assemblies, of IEC technical committee 121: Switchgear and controlgear and their
assemblies for low voltage. It is an International Standard.
This second edition of IEC 61439-4 cancels and replaces the first edition published in 2012.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 61439-1:2020 regarding the structure and technical content, as
applicable.
The text of this document is based on the following documents:
Draft Report on voting
121B/183/FDIS 121B/188/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard 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.
This document is to be read in conjunction with IEC 61439-1:2020. The provisions of the general
rules dealt with in IEC 61439-1:2020 are only applicable to this document insofar as they are
specifically cited. When this document states “addition”, “modification” or “replacement”, the
relevant text in IEC 61439-1:2020 is to be adapted accordingly.
Subclauses that are numbered with a 101 (102, 103, etc.) suffix are additional to the same
subclause in IEC 61439-1:2020.
Tables and figures in this document that are new are numbered starting with 101.
New annexes in this document are lettered AA, BB, etc.
In this document, terms written in small capitals are defined in Clause 3.
The reader’s attention is drawn to the fact that Annex N lists all of the “in-some-country” clauses
on differing practices of a less permanent nature relating to the subject of this document.
A list of all parts of the IEC 61439 series, under the general title Low-voltage switchgear and
controlgear assemblies, can be found on the IEC website.
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
– 6 – IEC 61439-4:2023 RLV © IEC 2023
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –
Part 4: Particular requirements for assemblies
for construction sites (ACS)
1 Scope
NOTE Throughout this document, the abbreviation ACS (assembly for construction site, see 3.1.101) is used for a
low-voltage switchgear and controlgear assembly intended for use on construction and similar sites.
This document defines the specific requirements of ACS as follows:
– assemblies for which the rated voltage does not exceed 1 000 V in case of AC or 1 500 V
in case of DC;
– assemblies where the nominal primary voltage and the nominal secondary voltage of
transformers incorporated in ACS are within the limits specified above;
– assemblies intended for use on construction sites, both indoors and outdoors, i.e. temporary
places of work to which the public do not generally have access and where building
construc
...
IEC 61439-4 ®
Edition 2.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
Ensembles d'appareillage à basse tension –
Partie 4: Exigences particulières pour ensembles de chantiers (EC)
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
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IEC 61439-4 ®
Edition 2.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 4: Particular requirements for assemblies for construction sites (ACS)
Ensembles d'appareillage à basse tension –
Partie 4: Exigences particulières pour ensembles de chantiers (EC)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-7538-2
– 2 – IEC 61439-4:2023 © IEC 2023
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols and abbreviations . 8
5 Interface characteristics. 8
6 Information . 9
7 Service conditions . 10
8 Constructional requirements . 10
9 Performance requirements. 13
10 Design verification . 13
11 Routine verification . 16
Annexes . 19
Annex C (informative) User information template . 20
Annex D (informative) Design verification . 24
Annex L (informative) Guidance on verification of temperature-rise . 25
Annex M (normative) Verification of the short-circuit withstand strength of BUSBAR
structures by comparison with a reference design by calculation . 26
Annex N (informative) List of notes concerning certain countries . 27
Bibliography . 28
Figure 101 – Impact test using striking element . 15
Table 101 – Values of assumed loading . 18
Table C.1 – Items subject to agreement between the assembly manufacturer
and the user . 20
Table D.1 – List of design verifications to be performed . 24
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –
Part 4: Particular requirements for assemblies
for construction sites (ACS)
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. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61439-4 has been prepared by subcommittee 121B: Low-voltage switchgear and
controlgear assemblies, of IEC technical committee 121: Switchgear and controlgear and their
assemblies for low voltage. It is an International Standard.
This second edition of IEC 61439-4 cancels and replaces the first edition published in 2012.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 61439-1:2020 regarding the structure and technical content, as
applicable.
– 4 – IEC 61439-4:2023 © IEC 2023
The text of this document is based on the following documents:
Draft Report on voting
121B/183/FDIS 121B/188/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard 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.
This document is to be read in conjunction with IEC 61439-1:2020. The provisions of the general
rules dealt with in IEC 61439-1:2020 are only applicable to this document insofar as they are
specifically cited. When this document states “addition”, “modification” or “replacement”, the
relevant text in IEC 61439-1:2020 is to be adapted accordingly.
Subclauses that are numbered with a 101 (102, 103, etc.) suffix are additional to the same
subclause in IEC 61439-1:2020.
Tables and figures in this document that are new are numbered starting with 101.
New annexes in this document are lettere
...
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