Low-voltage switchgear and controlgear assemblies- Part 0: Guidance to specifying assemblies

IEC TR 61439-0:2022 standards for low-voltage switchgear and controlgear assemblies, there are system and application details that are specified by the specifier to enable the manufacturer to produce an assembly that meets the needs and expectations of the specifier.
IEC/TR 61439-0:2022, identifies from the specifier’s perspective those functions and characteristics that are defined when specifying assemblies. It provides:
an explanation of the assembly characteristics and options within the IEC 61439 series;
a guidance on how to select the appropriate options and define characteristics so as to meet specific application needs; and
an assistance in the specification of assemblies.  References within this document to the interface characteristics of an assembly and the requirements with which they will comply assume that the assembly is designed, manufactured, and verified in accordance with the relevant part of the IEC 61439 series.
This third edition cancels and replaces the second edition published in 2013. It constitutes a technical revision.
This third edition includes the following significant technical changes with respect to the previous edition:  
alignment with IEC 61439-1:2020;
addition of new content in Clause 13 regarding current ratings;
addition of a new subclause 12.8.1 detailing the fundamentals of the forms of internal separation;
alignment of Annex B with Annex AA of 61439-2:2020;
removal of the annexes detailing items subject to agreement between specifier and manufacturer for all product parts as not all of them can always be up to date

Ensembles d'appareillage à basse tension - Partie 0: Recommandations pour la spécification d’ensembles

IEC TR 61439-0:2022 la série de normes IEC 61439 couvrant les ensembles d’appareillage à basse tension, certains détails de système et d’application sont spécifiés par le prescripteur afin de permettre au constructeur de produire un ensemble qui satisfait aux besoins et aux attentes du prescripteur.
L’IEC 61439-0:2022, identifie du point de vue du prescripteur les fonctions et les caractéristiques qui sont définies lors de la spécification des ensembles. Elle fournit:
une explication des caractéristiques et des options contenues dans la série IEC 61439;
des recommandations relatives à la manière de choisir les options appropriées et de définir des caractéristiques de manière à satisfaire aux besoins spécifiques de l’application; et
une aide à la spécification des ensembles.  Les références faites dans le présent document aux caractéristiques d’interface d’un ensemble et aux exigences auxquelles elles sont conformes partent du principe que l’ensemble est conçu, construit et vérifié conformément à la partie pertinente de la série IEC 61439.
Cette troisième édition annule et remplace la deuxième édition parue en 2013. Cette édition constitue une révision technique.
Cette troisième édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:  
alignement sur l’IEC 61439-1:2020;
ajout d’un nouveau contenu à l’Article 13 concernant les caractéristiques assignées de courant;
ajout d’un nouveau paragraphe 12.8.1 décrivant les principes fondamentaux des formes de séparation interne;
alignement de l’Annexe B sur l’Annexe AA de l’IEC 61439-2:2020;
suppression des annexes décrivant les sujets soumis à accord entre le prescripteur et le constructeur pour toutes les parties de produit, car elles ne peuvent pas toutes être toujours à jour.

General Information

Status
Published
Publication Date
21-Jul-2022
Current Stage
PPUB - Publication issued
Completion Date
22-Jul-2022
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IEC TR 61439-0
Edition 3.0 2022-07
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Low-voltage switchgear and controlgear assemblies –
Part 0: Guidance to specifying assemblies
Ensembles d’appareillage à basse tension –
Partie 0: Recommandations pour la spécification d’ensembles
IEC TR 61439-0:2022-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TR 61439-0
Edition 3.0 2022-07
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Low-voltage switchgear and controlgear assemblies –
Part 0: Guidance to specifying assemblies
Ensembles d’appareillage à basse tension –
Partie 0: Recommandations pour la spécification d’ensembles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-4027-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC TR 61439-0:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope ............................................................................................................................ 10

2 Normative references .................................................................................................... 10

3 Terms and definitions .................................................................................................... 11

4 Application of assemblies within the IEC 61439 series ................................................... 11

4.1 General ................................................................................................................. 11

4.2 Assembly design and verification .......................................................................... 11

4.3 Service conditions and interface characteristics .................................................... 13

4.4 Application design ................................................................................................. 13

5 Electrical system ........................................................................................................... 13

5.1 General ................................................................................................................. 13

5.2 Earthing system .................................................................................................... 13

5.3 Nominal voltage .................................................................................................... 14

5.4 Transient overvoltages .......................................................................................... 14

5.5 Unusual voltage transients, temporary overvoltages ............................................. 16

5.6 Rated frequency f (Hz) ........................................................................................ 16

5.7 Additional on-site testing requirements: wiring, operational performance and

function ................................................................................................................. 17

6 Short-circuit withstand capability ................................................................................... 17

6.1 General ................................................................................................................. 17

6.2 Prospective short-circuit current at supply terminals I (kA) ................................ 18

6.3 Prospective short-circuit current in the neutral ...................................................... 19

6.4 Prospective short-circuit current in the protective circuit ....................................... 19

6.5 Short-circuit protective device (SCPD) .................................................................. 19

6.6 Coordination of short-circuit protective devices including external short-

circuit protective device details ............................................................................. 20

6.7 Data associated with loads likely to contribute to the short-circuit current ............. 21

6.8 Multiple supplies ................................................................................................... 21

7 Protection of persons against electric shock .................................................................. 21

7.1 General ................................................................................................................. 21

7.2 Basic protection (protection against direct contact) ............................................... 21

7.2.1 General ......................................................................................................... 21

7.2.2 Basic insulation provided by insulating material ............................................. 22

7.2.3 Basic insulation by barriers or enclosures ...................................................... 22

7.3 Fault protection (protection against indirect contact) ............................................. 22

7.3.1 General ......................................................................................................... 22

7.3.2 Requirements for the protective conductor to facilitate automatic

disconnection of the supply ........................................................................... 23

7.3.3 Electrical separation ...................................................................................... 24

7.3.4 Class II protection (double or reinforced insulation) ....................................... 24

8 Installation environment ................................................................................................. 24

8.1 General ................................................................................................................. 24

8.2 Location type ........................................................................................................ 24

8.3 Protection against access to hazardous parts, ingress of solid foreign bodies

and ingress of water (IP code) .............................................................................. 25

---------------------- Page: 4 ----------------------
IEC TR 61439-0:2022 © IEC 2022 – 3 –

8.4 External mechanical impact (IK code) ................................................................... 28

8.5 Resistance to radiation ......................................................................................... 29

8.5.1 General ......................................................................................................... 29

8.5.2 Solar irradiance ............................................................................................. 29

8.5.3 Ultraviolet (UV) radiation ............................................................................... 29

8.6 Resistance to corrosion ........................................................................................ 29

8.7 Ambient air temperature ........................................................................................ 30

8.8 Maximum relative humidity .................................................................................... 30

8.9 Pollution degree .................................................................................................... 31

8.10 Altitude ................................................................................................................. 32

8.11 Electromagnetic compatibility (EMC) ..................................................................... 32

8.12 Special service conditions ..................................................................................... 33

8.12.1 General ......................................................................................................... 33

8.12.2 Climatic conditions ........................................................................................ 34

8.12.3 Protection against ingress of solid foreign bodies and ingress of water

(IP code) ....................................................................................................... 34

8.12.4 Shock, vibration, seismic occurrence and external mechanical impact

(IK code) ....................................................................................................... 34

8.12.5 Fire and explosion hazards ............................................................................ 34

8.12.6 Exceptional overvoltages ............................................................................... 34

8.12.7 Polluted atmospheres .................................................................................... 35

8.12.8 EMC environment .......................................................................................... 35

9 Installation method ........................................................................................................ 35

9.1 General ................................................................................................................. 35

9.2 Assembly type ...................................................................................................... 35

9.3 Portability ............................................................................................................. 36

9.4 Maximum overall dimensions and weight .............................................................. 36

9.5 External conductor type(s) .................................................................................... 36

9.6 Direction(s) of external conductors ........................................................................ 37

9.7 External conductor material .................................................................................. 37

9.8 External line conductor, cross sections, and terminations ..................................... 37

9.9 External PE, N, PEN, PEM, PEL conductors’ cross sections, and

terminations .......................................................................................................... 37

9.10 Special terminal identification requirements .......................................................... 38

10 Storage and handling..................................................................................................... 38

10.1 General ................................................................................................................. 38

10.2 Maximum dimensions and weight of transport units ............................................... 38

10.3 Methods of transport (e.g. forklift, crane) .............................................................. 38

10.4 Environmental conditions different from the service conditions .............................. 39

10.5 Packing details ..................................................................................................... 39

11 Operating arrangements ................................................................................................ 39

11.1 General ................................................................................................................. 39

11.2 Access to manually operated devices ................................................................... 39

12 Maintenance and upgrade capabilities ........................................................................... 40

12.1 General ................................................................................................................. 40

12.2 Requirements related to accessibility for inspection and similar operations ........... 40

12.3 Requirements related to accessibility for maintenance in service by

authorized persons ............................................................................................... 41

12.4 Requirements related to extension under voltage .................................................. 41

---------------------- Page: 5 ----------------------
– 4 – IEC TR 61439-0:2022 © IEC 2022
12.5 Protection against direct contact with hazardous live internal parts during

maintenance or upgrade ....................................................................................... 41

12.6 Method of functional unit connection ..................................................................... 42

12.7 Operating and maintenance gangways within an assembly ................................... 42

12.8 Internal separation (only relevant for assemblies in accordance with

IEC 61439-2) ........................................................................................................ 42

12.8.1 Fundamentals of separation ........................................................................... 42

12.8.2 Considerations when determining a form of separation .................................. 43

12.8.3 Selecting the most appropriate form of separation ......................................... 44

13 Current carrying capability ............................................................................................. 46

13.1 General ................................................................................................................. 46

13.2 Rated current of the assembly I (A) (maximum current allowable) ..................... 46

13.3 Loading of outgoing circuits within an assembly .................................................... 47

13.4 Ratio of cross section of the neutral conductor to line conductors ......................... 48

13.4.1 General ......................................................................................................... 48

13.4.2 Line conductors up to and including 16 mm ................................................. 48

13.4.3 Line conductors above 16 mm ..................................................................... 48

14 Assembly design and routine verification processes ...................................................... 49

14.1 Design verification ................................................................................................ 49

14.1.1 Object ............................................................................................................ 49

14.1.2 Methods ........................................................................................................ 49

14.1.3 Records ......................................................................................................... 50

14.2 Routine verification ............................................................................................... 50

14.2.1 General ......................................................................................................... 50

14.2.2 Records ......................................................................................................... 50

Annex A (informative) Cross section of copper cables suitable for connection to

terminals for external cables ................................................................................................. 51

Annex B (informative) Forms of internal separation (see 12.8) ............................................. 52

Annex C (informative) Specification template for assemblies ............................................... 58

Annex D (informative) Optional information .......................................................................... 62

D.1 General ................................................................................................................. 62

D.2 Electrical conditions .............................................................................................. 63

D.2.1 Internal arc-fault considerations ..................................................................... 63

D.2.2 Insulated busbars .......................................................................................... 64

Annex E (informative) List of notes concerning certain countries .......................................... 65

Bibliography .......................................................................................................................... 66

Figure 1 – Required rated impulse withstand voltage ............................................................ 16

Figure 2 – Examples of separation included in IEC 61439-2 .................................................. 45

Figure B.1 – Symbols used in Figure B.2, Figure B.3 and Figure B.4 .................................... 53

Figure B.2 – Form 1 and Form 2 ........................................................................................... 55

Figure B.3 – Form 3 .............................................................................................................. 56

Figure B.4 – Form 4 .............................................................................................................. 57

Table 1 – IP codes, first numeral .......................................................................................... 26

Table 2 – IP codes, second numeral ..................................................................................... 27

---------------------- Page: 6 ----------------------
IEC TR 61439-0:2022 © IEC 2022 – 5 –

Table 3 – IP codes, additional letter (optional) ...................................................................... 28

Table 4 – Assemblies and application ratings ........................................................................ 48

Table A.1 – Cross section of copper cables suitable for connection to terminals for

external cables ..................................................................................................................... 51

Table B.1 – Forms of internal separation............................................................................... 52

Table C.1 – Example of items typically subject to agreement between the assembly

manufacturer and the user .................................................................................................... 58

Table D.1 – Examples of optional items subject to agreement between the assembly

manufacturer and the specifier .............................................................................................. 62

---------------------- Page: 7 ----------------------
– 6 – IEC TR 61439-0:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 0: Guidance to specifying assemblies
FOREWORD

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IEC TR 61439-0 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 a Technical Report.

This third edition cancels and replaces the second edition published in 2013. It constitutes a

technical revision.

This third edition includes the following significant technical changes with respect to the

previous edition:
a) alignment with IEC 61439-1:2020;
b) addition of new content in Clause 13 regarding current ratings;

c) addition of a new subclause 12.8.1 detailing the fundamentals of the forms of internal

separation;
d) alignment of Annex B with Annex AA of 61439-2:2020;

e) removal of the annexes detailing items subject to agreement between specifier and

manufacturer for all product parts as not all of them can always be up to date
---------------------- Page: 8 ----------------------
IEC TR 61439-0:2022 © IEC 2022 – 7 –
The text of this Technical Report is based on the following documents:
Draft Report on voting
121B/126/DTR 121B/152/RVDTR

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 Technical Report 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/standardsdev/publications.

The reader’s attention is drawn to the fact that Annex E 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 web site.

The committee has decided that the contents of this publication will remain unchanged until the

stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to

the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 9 ----------------------
– 8 – IEC TR 61439-0:2022 © IEC 2022
INTRODUCTION

Low-voltage assemblies form an integral part of most electrical distribution networks. In their

application they have two prime functions:
– to safely control and distribute electrical energy; and
– to safely isolate sections of faulted networks.

Whilst these two functions place very different demands on the assembly, an assembly has to

be capable of performing both these functions throughout its expected service life. Controlling

and distributing electrical energy is the assembly’s routine ongoi
...

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