Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies

IEC 61439-2:2020 defines the specific requirements for the power switchgear and controlgear assembly (abbreviated ‘PSC-assembly’ throughout this document see 3.1.101) as follows:
assemblies for which the rated voltage does not exceed 1 000 V AC or 1 500 V DC;
assemblies designed for a nominal frequency of the incoming supply or supplies not exceeding 1 000 Hz;  NOTE 1 Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5 to take into account additional constraints to insulation coordination.
assemblies intended for indoor and outdoor applications;
stationary or movable assemblies with or without enclosures;
assemblies intended for use in connection with the generation, transmission, distribution and conversion of electrical energy, and for the control of equipment consuming electrical energy and for associated data processing;
assemblies designed for use under special service conditions, for example in ships and in rail vehicles, provided that the other relevant specific requirements are complied with;  NOTE 2 Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.
This third edition cancels and replaces the second edition published in 2011. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:  
addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;
clarification of the requirements for forms of internal separation and the addition of the requirement, when the form of separation is higher than 1, all parts within the functional unit compartment that remain live when the functional unit is switched off shall be protected to at least IPXXB;
alignment with the structure of IEC 61439-1:2020;
addition of temperature-rise verification for; (i) temperature-rise verification of assemblies with natural cooling and circuits rated above 1 600 A by a combination of comparison with a reference design and calculation, and; (ii) temperature-rise verification of assemblies with active cooling and rated currents up to 1 600 A.
consideration of IP with active cooling.

Ensemble d'appareillage à basse tension - Partie 2 : Ensembles d’appareillage de puissance

L’IEC 61439:2020 définit les exigences spécifiques applicables aux ensembles d’appareillage de puissance (dans l’ensemble du présent document, l’abréviation "ensemble EAP" est utilisée pour désigner un ensemble d’appareillage de puissance; voir 3.1.101) comme suit:
ensembles dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu;
ensembles conçus pour une fréquence nominale de l’alimentation ou des alimentations entrantes ne dépassant pas 1 000 Hz;  NOTE 1 Les fréquences supérieures à 1 kHz sont considérées comme des hautes fréquences, voir aussi l’IEC 60664-1:2007, 5.3.3.2.5 pour tenir compte des contraintes supplémentaires relatives à la coordination de l’isolement.
ensembles destinés à des applications d’intérieur et d’extérieur;
ensembles fixes ou mobiles, avec ou sans enveloppe;
ensembles destinés à être utilisés avec des équipements conçus pour la production, le transport, la distribution et la conversion de l’énergie électrique, ainsi que pour la commande des matériels consommant de l’énergie électrique et le traitement des données associées;
ensembles conçus pour être utilisés dans des conditions spéciales d’emploi, par exemple à bord de navires et de véhicules sur rails, à condition que les autres exigences spécifiques correspondantes soient respectées.  NOTE 2 Les exigences supplémentaires pour les ensembles à bord des navires sont couvertes par l’IEC 60092-302-2.
Cette troisième édition annule et remplace la deuxième édition parue en 2011 dont elle constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  
ajout des Annexes DD, EE et FF pour les ensembles utilisables dans les installations photovoltaïques;
clarification des exigences concernant les formes de séparation interne et ajout de l’exigence selon laquelle, lorsque la forme de séparation de numéro supérieur à 1, toutes les parties à l’intérieur du compartiment de l’unité fonctionnelle qui restent actives lorsque l’unité fonctionnelle est désactivée doivent être protégées au moins selon le degré de protection IPXXB;
alignement sur la structure de l’IEC 61439-1:2020;
ajout de la vérification de l’échauffement pour (i) la vérification de l’échauffement des ensembles à ventilation naturelle et des circuits de courant assigné supérieur à 1 600 A par une combinaison de comparaison entre une conception de référence et le calcul, et (ii) la vérification de l’échauffement des ensembles à ventilation forcée et avec des courants assignés jusqu’à 1 600 A;
prise en compte du degré de protection IP pour la ventilation forcée.

General Information

Status
Published
Publication Date
21-Jul-2020
Current Stage
PPUB - Publication issued
Completion Date
22-Jul-2020
Ref Project

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IEC 61439-2
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear assemblies –
Part 2: Power switchgear and controlgear assemblies
IEC 61439-2:2020-07(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61439-2
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear assemblies –
Part 2: Power switchgear and controlgear assemblies
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-8587-9

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 61439-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Symbols and abbreviations .............................................................................................. 9

5 Interface characteristics .................................................................................................. 9

6 Information .................................................................................................................... 10

7 Service conditions ......................................................................................................... 11

8 Constructional requirements .......................................................................................... 11

9 Performance requirements ............................................................................................ 14

10 Design verification ......................................................................................................... 15

11 Routine verification ........................................................................................................ 19

Annexes ............................................................................................................................... 22

Annex AA (informative) Items subject to agreement between the PSC-assembly

manufacturer and the user .................................................................................................... 23

Annex BB (informative) Forms of internal separation (see 8.101) ......................................... 27

Annex CC (informative) Determining power loss by measurement for circuits

exceeding 1600 A in a reference design ............................................................................... 32

Annex DD (informative) Assemblies for use in photovoltaic installations .............................. 34

Annex EE (informative) Items subject to agreement between the photovoltaic

assembly (PVA) manufacturer and the user .......................................................................... 43

Annex FF (informative) Design verification (PVA only) ......................................................... 47

Annex GG (informative) List of notes concerning certain countries ....................................... 49

Bibliography .......................................................................................................................... 50

Figure BB.1 – Symbols used in Figures BB.2, BB.3 and BB.4 ............................................... 27

Figure BB.2 – Forms 1 and 2 ................................................................................................ 29

Figure BB.3 – Form 3 ............................................................................................................ 30

Figure BB.4 – Form 4 ............................................................................................................ 31

Figure CC.1 – Power loss measurement ............................................................................... 33

Figure DD.101 – Indicative arrangement of radiant heat lamps for temperature-rise test

with simulated solar radiation ................................................................................................ 41

Table 101 – Values of assumed loading ................................................................................ 19

Table 102 – Test voltages across the open contacts of equipment suitable for isolation ........ 19

Table 103 – Electrical conditions for the different positions of withdrawable parts ................. 20

Table 104 – Forms of internal separation .............................................................................. 21

Table AA.1 – Items subject to agreement between the PSC-assembly manufacturer

and the user ......................................................................................................................... 23

Table DD.101 – Solar radiation conditions ............................................................................ 38

Table EE.1 – Items subject to agreement between the PVA manufacturer and the user ....... 43

Table FF.1 – List of design verifications to be performed on PVA .......................................... 47

---------------------- Page: 4 ----------------------
IEC 61439-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 2: Power switchgear and controlgear assemblies
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,

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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

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61439-2 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.

This third edition cancels and replaces the second edition published in 2011. It constitutes a

technical revision.

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

edition:

a) addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;

b) clarification of the requirements for forms of internal separation and the addition of the

requirement, when the form of separation is higher than 1, all parts within the functional

unit compartment that remain live when the functional unit is switched off shall be

protected to at least IPXXB;
c) alignment with the structure of IEC 61439-1:2020;
---------------------- Page: 5 ----------------------
– 4 – IEC 61439-2:2020 © IEC 2020

d) addition of temperature-rise verification for; (i) temperature-rise verification of assemblies

with natural cooling and circuits rated above 1 600 A by a combination of comparison with

a reference design and calculation, and; (ii) temperature-rise verification of assemblies

with active cooling and rated currents up to 1 600 A.
e) consideration of IP with active cooling.
The text of this document is based on the following documents:
FDIS Report on voting
121B/104/FDIS 121B/109/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

In this document, general terms and definitions are defined in Clause 3. Further terms and

definitions specific to Annex DD are given in this annex to facilitate easier reading.

The reader's attention is drawn to the fact that Annex GG lists all the “in-some-country”

clauses on differing practices of a less permanent nature relating to the subject of this

document.

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 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 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.
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, the term PSC-assembly is defined in 3.1.101.

NOTE Throughout the IEC 61439 series of standards, the term assembly (see 3.1.1 of IEC 61439-1:2020) is used

for a low-voltage switchgear and controlgear assembly.

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 "http://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.
---------------------- Page: 6 ----------------------
IEC 61439-2:2020 © IEC 2020 – 5 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 2: Power switchgear and controlgear assemblies
1 Scope

This part of IEC 61439 defines the specific requirements for the power switchgear and

controlgear assembly (abbreviated ‘PSC-assembly’ throughout this document see 3.1.101) as

follows:

• assemblies for which the rated voltage does not exceed 1  000 V AC or 1  500 V DC;

• assemblies designed for a nominal frequency of the incoming supply or supplies not

exceeding 1  000 Hz;

NOTE 1 Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5

to take into account additional constraints to insulation coordination.
• assemblies intended for indoor and outdoor applications;
• stationary or movable assemblies with or without enclosures;

• assemblies intended for use in connection with the generation, transmission, distribution

and conversion of electrical energy, and for the control of equipment consuming electrical

energy and for associated data processing;

• assemblies designed for use under special service conditions, for example in ships and in

rail vehicles, provided that the other relevant specific requirements are complied with;

NOTE 2 Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.

This document also applies to assemblies for use in photovoltaic installations, designated as

photovoltaic assemblies (PVA). The particular characteristics, specific service conditions and

the requirements for PVA’s are included in Annexes DD, EE and FF.

This document provides supplementary requirements for PSC-assemblies intended for use as

part of the electrical equipment of machines and can be applied in addition to the

requirements given in IEC 60204-1.

This document applies to all assemblies whether they are designed, manufactured and

verified on a one-off basis or fully standardised and manufactured in quantity.

The manufacture and/or assembly can be carried out by an entity other than the original

manufacturer (see 3.10.1 of IEC 61439-1:2020).

This document does not apply to individual devices, for example, circuit-breakers, fuse

switches and self-contained components such as, motor starters, power electronic converter

systems and equipment (PECS), switch mode power supplies (SMPS), uninterruptable power

supplies (UPS), basic drive modules (BDM), complete drive modules (CDM), adjustable speed

power drives systems (PDS), stand-alone energy storage systems (battery and capacitor

systems), and other electronic equipment which comply with their relevant product standards.

This document describes their integration into a PSC-assembly or an empty enclosure used

as a part of a PSC-assembly.

For some applications, such as, explosive atmospheres, functional safety, there may be a

need to comply with the requirements of other standards or legislation in addition to those

specified in the IEC 61439 series.
---------------------- Page: 7 ----------------------
– 6 – IEC 61439-2:2020 © IEC 2020

This document does not apply to the specific types of assemblies covered by other parts of

IEC 61439. For assemblies not covered by other parts, this part applies.

Unless local legislation details additional requirements, equipment within the scope of this

document, which complies with this document, is deemed to meet essential safety

requirements. This includes fully verified specifier options, for example user choice of

protection against accidental contact with hazardous live parts of IPXXB or IP3XD. Where

special requirements are agreed between the user and manufacturer, that are not fully

specified within this document, for example, (i) part of the assembly is outside the scope of

this document, (ii) exceptional vibration is present at the place of installation, (iii) exceptional

voltage variations occur in service, or (iv) possible adverse effects from sonic or ultrasonic

sources, a risk assessment and/or additional or more severe verifications may be required to

demonstrate that the essential safety requirements have been fulfilled.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.
Clause 2 of IEC 61439-1:2020 is applicable in addition to the following:
Addition:

IEC 60204-1:2016, Safety of machinery – Electrical equipment of machines – Part 1: General

requirements

IEC 60947-3:2008, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,

switch-disconnectors and fuse-combination units
IEC 60947-3:2008/AMD1:2012
IEC 60947-3:2008/AMD2:2015

IEC 61140:2016, Protection against electric shock – Common aspects for installation and

equipment

IEC 61439-1:2020, Low-voltage switchgear and controlgear assemblies – Part 1: General

rules

IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment

against external mechanical impacts (IK code)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61439-1:2020 and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
Clause 3 of IEC 61439-1:2020 is applicable, except as follows.
---------------------- Page: 8 ----------------------
IEC 61439-2:2020 © IEC 2020 – 7 –
3.1 General terms
Additional terms and definitions:
3.1.101
power switchgear and controlgear assembly
PSC-assembly

assembly used to distribute and control electrical energy for all types of loads, intended for

industrial, commercial and similar applications where operation by ordinary persons is not

intended

Note 1 to entry: It is not excluded for a PSC-assembly to be located in an area accessible to ordinary persons.

3.1.102
test situation

condition of a PSC-assembly or part of it in which the relevant main circuits are open on its

supply side but not necessarily isolated whilst the associated auxiliary circuits are connected,

allowing operational tests of the incorporated device(s)
3.1.103
form of internal separation
classification of physical separation within a PSC-assembly
3.1.104
(electric) actuator
device that produces a specified movement when excited by an electric signal
[SOURCE: IEC 60050-151:2001, 151-13-49]
3.1.105
distribution circuit
electric circuit supplying one or more distribution boards
[SOURCE: IEC 60050-826:2004, 826-14-02]
3.1.106
final circuit

electric circuit intended to supply directly electric current to current using equipment or socket

outlets
[SOURCE: IEC 60050-826:2004, 826-14-03]
3.2 Constructional units of assemblies
Replacement of the title:
3.2 Constructional units of PSC-assemblies
Additional terms and definitions:
3.2.101
withdrawable part

removable part intended to be moved from the connected position to the isolated position and

to a test position, if any, whilst remaining mechanically attached to the PSC-assembly

---------------------- Page: 9 ----------------------
– 8 – IEC 61439-2:2020 © IEC 2020
3.2.102
test position

position of a withdrawable part in which the relevant main circuits are open on its supply side

but not necessarily isolated and in which the auxiliary circuits are connected allowing

operation tests of the incorporated device(s), the withdrawable part remaining mechanically

attached to the PSC-assembly

Note 1 to entry: The opening can also be achieved without any mechanical movement of the withdrawable part by

operation of a suitable device.
3.2.103
isolated position

position of a withdrawable part in which an isolating distance is established in main and

auxiliary circuits on its supply side, the withdrawable part remaining mechanically attached to

the PSC-assembly

Note 1 to entry: The isolating distance can also be established without any mechanical movement of the

withdrawable part by operation of a suitable device, e.g. a disconnector in accordance with IEC 60947-3.

3.2.104
isolating distance

clearance between open contacts of withdrawable parts meeting the safety requirements

specified for disconnectors

[SOURCE: IEC 60050-441:2000, 441-17-35, modified – The context information has been

moved to after contacts and changed.]
3.4 Structural parts of assemblies
Addition:
3.4.101
active cooling

use of equipment mounted on or within the assembly, installed to reduce or control the

assembly’s internal air temperature during normal operation, which requires energization to

operate

Note 1 to entry: Examples include fans, internal air conditioning, heat exchangers, etc.

3.4.102
pressure relief flap

mechanical component provided to limit the pressure rise in case of internal arc-faults

Additional terms and definitions:
3.101 Electrical connections of functional units
3.101.1
disconnectable connection

connection which is connected or disconnected by manual operation of the connecting means

without a tool
3.101.2
withdrawable connection

connection which is connected or disconnected by bringing the functional unit into the

connected or isolated position
---------------------- Page: 10 ----------------------
IEC 61439-2:2020 © IEC 2020 – 9 –
3.102 Gangways within PSC-assemblies
3.102.1
operating gangway within a PSC-assembly

space to be used by the operator for the proper operation and supervision of the PSC-

assembly
3.102.2
maintenance gangway within a PSC-assembly

space which is accessible to authorized personnel only and primarily intended for use when

servicing the installed equipment
3.103 Location
3.103.1
location with restricted access

location accessible for all persons who are permitted to have access to the location (e.g.

private housing, private parking areas or similar places)
3.103.2
location with non-restricted access
location accessible for all persons, e.g. the access is given in a public area
4 Symbols and abbreviations
Clause 4 of IEC 61439-1:2020 is applicable.
5 Interface characteristics
Clause 5 of IEC 61439-1:2020 is applicable, except as follows.
5.1 General
Replacement:

The characteristics of the PSC-assembly shall ensure compatibility with the ratings of the

circuits to which it is connected and the installation conditions. These characteristics shall be

declared by the PSC-assembly manufacturer using the criteria identified in 5.2 to 5.6 of

IEC 61439-1:2020, as amended by this document.

The specification schedule detailed in the informative Annex AA is intended to help the user

and the PSC-assembly manufacturer to meet this objective, whether the user:

– selects catalogue products, the characteristics of which meet their needs, and the

requirements of this document; and/or,
– makes a specific agreement with the manufacturer.
NOTE Annex AA also relates to the topics dealt with in Clauses 6 and 7.

In some cases, information provided by the PSC-assembly manufacturer may take the place

of an agreement.
5.3.3 Group rated current of a main circuit (I
Addition:

For further information on the assumed loading of the outgoing circuits, see 5.4.

---------------------- Page: 11 ----------------------
– 10 – IEC 61439-2:2020 © IEC 2020
5.4 Rated diversity factor (RDF)
Addition:

In the absence of an agreement between the assembly manufacturer and the user concerning

the actual load currents, the assumed loading of the outgoing circuits of the assembly or

group of outgoing circuits may be based on the values in Table 101.

For a motor or electric actuator circuit, the assumed load current is the rated current of the

motor multiplied with the loading factor of Table 101. If only the rated voltage and rated power

of the motor is provided, then the rated current of the motor can be taken from
IEC 60947-4-1:2018, Annex G.

For all other distribution and final circuits, it is assumed load current is the rated current of the

protective device, I , as required by the user, multiplied with the loading factor of Table 101.

5.6 Other characteristics
Replacement of item f):

f) degree of protection against contact with hazardous live parts, ingress of solid foreign

bodies and water, IP code (See 8.2.2 of IEC 61439-1:2020), including the degree of

protection for any distinct positions for removable and withdrawable parts;
Replacement of item g):

g) intended for use by electrically skilled, competent or instructed persons (see 3.7.13,

3.7.14 and 3.7.15 of IEC 61439-1:2020);
Replacement of item l):
l) type of construction – fixed, removable or withdrawable parts (see 8.5.1 of
IEC 61439-1:2020 and 8.5.2);
Addition:

aa) form of internal separation and associated degree of protection(s), IP code (see 8.101);

bb) types of electrical connections of functional units (see 8.5.101);

cc) mounting orientation (horizontal, vertical, etc.) if the assembly can be mounted in

different positions from vertical.
6 Information
Clause 6 of IEC 61439-1:2020 is applicable, except as follows.
6.1 Assembly designation marking
Replacement of the title and item g):
6.1 PSC-assembly designation marking
g) IEC 61439-2;
---------------------- Page: 12 ----------------------
IEC 61439-2:2020 © IEC 2020 – 11 –
6.2.2 Instructions for handling, installation, operation and maintenance
Addition:

A PSC-assembly that can be energized from more than one source shall carry a warning label

indicating that the assembly is energized from more than one source, and that parts inside the

assembly can still be live unless all supplies are isolated.
7 Service conditions
Clause 7 of IEC 61439-1:2020 is applicable.
8 Constructional requirements
Clause 8 of IEC 61439-1:2020 is applicable, except as follows.
8.1.1 General
Addition:

For assemblies intended to be used for machines, the requirements given in 11.4 of

IEC 60204-1:2016 shall apply.
8.2 Degree of protection provided by an assembly enclosure
Replacement of the title:
8.2 Degree of protection provided by a PSC-assembly enclosure
8.2.1 Protection against mechanical impact (IK code)
Replacement of text:

Where a degree of protection (IK code) provided by a PSC-assembly enclosure against

mechanical impact is declared by the original manufacturer, this shall be verified in

accordance with 10.2.6.
NOTE It is not mandatory for the manufacturer to declare an IK code.
Additional subclause:
8.2.101 PSC-assembly with withdrawable parts

The degree of protection (IP code) indicated for PSC-assemblies normally applies to the

connected positi
...

IEC 61439-2
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 2: Power switchgear and controlgear assemblies
Ensembles d’appareillage à basse tension –
Partie 2: Ensembles d’appareillage de puissance
IEC 61439-2:2020-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61439-2
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 2: Power switchgear and controlgear assemblies
Ensembles d’appareillage à basse tension –
Partie 2: Ensembles d’appareillage de puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-9069-9

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 61439-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Symbols and abbreviations .............................................................................................. 9

5 Interface characteristics .................................................................................................. 9

6 Information .................................................................................................................... 10

7 Service conditions ......................................................................................................... 11

8 Constructional requirements .......................................................................................... 11

9 Performance requirements ............................................................................................ 14

10 Design verification ......................................................................................................... 15

11 Routine verification ........................................................................................................ 19

Annexes ............................................................................................................................... 22

Annex AA (informative) Items subject to agreement between the PSC-assembly

manufacturer and the user .................................................................................................... 23

Annex BB (informative) Forms of internal separation (see 8.101) ......................................... 27

Annex CC (informative) Determining power loss by measurement for circuits

exceeding 1600 A in a reference design ............................................................................... 32

Annex DD (informative) Assemblies for use in photovoltaic installations .............................. 34

Annex EE (informative) Items subject to agreement between the photovoltaic

assembly (PVA) manufacturer and the user .......................................................................... 43

Annex FF (informative) Design verification (PVA only) ......................................................... 47

Annex GG (informative) List of notes concerning certain countries ....................................... 49

Bibliography .......................................................................................................................... 50

Figure BB.1 – Symbols used in Figures BB.2, BB.3 and BB.4 ............................................... 27

Figure BB.2 – Forms 1 and 2 ................................................................................................ 29

Figure BB.3 – Form 3 ............................................................................................................ 30

Figure BB.4 – Form 4 ............................................................................................................ 31

Figure CC.1 – Power loss measurement ............................................................................... 33

Figure DD.101 – Indicative arrangement of radiant heat lamps for temperature-rise test

with simulated solar radiation ................................................................................................ 41

Table 101 – Values of assumed loading ................................................................................ 19

Table 102 – Test voltages across the open contacts of equipment suitable for isolation ........ 19

Table 103 – Electrical conditions for the different positions of withdrawable parts ................. 20

Table 104 – Forms of internal separation .............................................................................. 21

Table AA.1 – Items subject to agreement between the PSC-assembly manufacturer

and the user ......................................................................................................................... 23

Table DD.101 – Solar radiation conditions ............................................................................ 38

Table EE.1 – Items subject to agreement between the PVA manufacturer and the user ....... 43

Table FF.1 – List of design verifications to be performed on PVA .......................................... 47

---------------------- Page: 4 ----------------------
IEC 61439-2:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 2: Power switchgear and controlgear assemblies
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,

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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

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61439-2 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.

This third edition cancels and replaces the second edition published in 2011. It constitutes a

technical revision.

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

edition:

a) addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;

b) clarification of the requirements for forms of internal separation and the addition of the

requirement, when the form of separation is higher than 1, all parts within the functional

unit compartment that remain live when the functional unit is switched off shall be

protected to at least IPXXB;
c) alignment with the structure of IEC 61439-1:2020;
---------------------- Page: 5 ----------------------
– 4 – IEC 61439-2:2020 © IEC 2020

d) addition of temperature-rise verification for; (i) temperature-rise verification of assemblies

with natural cooling and circuits rated above 1 600 A by a combination of comparison with

a reference design and calculation, and; (ii) temperature-rise verification of assemblies

with active cooling and rated currents up to 1 600 A.
e) consideration of IP with active cooling.
The text of this document is based on the following documents:
FDIS Report on voting
121B/104/FDIS 121B/109/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

In this document, general terms and definitions are defined in Clause 3. Further terms and

definitions specific to Annex DD are given in this annex to facilitate easier reading.

The reader's attention is drawn to the fact that Annex GG lists all the “in-some-country”

clauses on differing practices of a less permanent nature relating to the subject of this

document.

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 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 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.
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, the term PSC-assembly is defined in 3.1.101.

NOTE Throughout the IEC 61439 series of standards, the term assembly (see 3.1.1 of IEC 61439-1:2020) is used

for a low-voltage switchgear and controlgear assembly.

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 "http://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.
---------------------- Page: 6 ----------------------
IEC 61439-2:2020 © IEC 2020 – 5 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 2: Power switchgear and controlgear assemblies
1 Scope

This part of IEC 61439 defines the specific requirements for the power switchgear and

controlgear assembly (abbreviated ‘PSC-assembly’ throughout this document see 3.1.101) as

follows:

• assemblies for which the rated voltage does not exceed 1  000 V AC or 1  500 V DC;

• assemblies designed for a nominal frequency of the incoming supply or supplies not

exceeding 1  000 Hz;

NOTE 1 Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5

to take into account additional constraints to insulation coordination.
• assemblies intended for indoor and outdoor applications;
• stationary or movable assemblies with or without enclosures;

• assemblies intended for use in connection with the generation, transmission, distribution

and conversion of electrical energy, and for the control of equipment consuming electrical

energy and for associated data processing;

• assemblies designed for use under special service conditions, for example in ships and in

rail vehicles, provided that the other relevant specific requirements are complied with;

NOTE 2 Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.

This document also applies to assemblies for use in photovoltaic installations, designated as

photovoltaic assemblies (PVA). The particular characteristics, specific service conditions and

the requirements for PVA’s are included in Annexes DD, EE and FF.

This document provides supplementary requirements for PSC-assemblies intended for use as

part of the electrical equipment of machines and can be applied in addition to the

requirements given in IEC 60204-1.

This document applies to all assemblies whether they are designed, manufactured and

verified on a one-off basis or fully standardised and manufactured in quantity.

The manufacture and/or assembly can be carried out by an entity other than the original

manufacturer (see 3.10.1 of IEC 61439-1:2020).

This document does not apply to individual devices, for example, circuit-breakers, fuse

switches and self-contained components such as, motor starters, power electronic converter

systems and equipment (PECS), switch mode power supplies (SMPS), uninterruptable power

supplies (UPS), basic drive modules (BDM), complete drive modules (CDM), adjustable speed

power drives systems (PDS), stand-alone energy storage systems (battery and capacitor

systems), and other electronic equipment which comply with their relevant product standards.

This document describes their integration into a PSC-assembly or an empty enclosure used

as a part of a PSC-assembly.

For some applications, such as, explosive atmospheres, functional safety, there may be a

need to comply with the requirements of other standards or legislation in addition to those

specified in the IEC 61439 series.
---------------------- Page: 7 ----------------------
– 6 – IEC 61439-2:2020 © IEC 2020

This document does not apply to the specific types of assemblies covered by other parts of

IEC 61439. For assemblies not covered by other parts, this part applies.

Unless local legislation details additional requirements, equipment within the scope of this

document, which complies with this document, is deemed to meet essential safety

requirements. This includes fully verified specifier options, for example user choice of

protection against accidental contact with hazardous live parts of IPXXB or IP3XD. Where

special requirements are agreed between the user and manufacturer, that are not fully

specified within this document, for example, (i) part of the assembly is outside the scope of

this document, (ii) exceptional vibration is present at the place of installation, (iii) exceptional

voltage variations occur in service, or (iv) possible adverse effects from sonic or ultrasonic

sources, a risk assessment and/or additional or more severe verifications may be required to

demonstrate that the essential safety requirements have been fulfilled.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.
Clause 2 of IEC 61439-1:2020 is applicable in addition to the following:
Addition:

IEC 60204-1:2016, Safety of machinery – Electrical equipment of machines – Part 1: General

requirements

IEC 60947-3:2008, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors,

switch-disconnectors and fuse-combination units
IEC 60947-3:2008/AMD1:2012
IEC 60947-3:2008/AMD2:2015

IEC 61140:2016, Protection against electric shock – Common aspects for installation and

equipment

IEC 61439-1:2020, Low-voltage switchgear and controlgear assemblies – Part 1: General

rules

IEC 62262:2002, Degrees of protection provided by enclosures for electrical equipment

against external mechanical impacts (IK code)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61439-1:2020 and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
Clause 3 of IEC 61439-1:2020 is applicable, except as follows.
---------------------- Page: 8 ----------------------
IEC 61439-2:2020 © IEC 2020 – 7 –
3.1 General terms
Additional terms and definitions:
3.1.101
power switchgear and controlgear assembly
PSC-assembly

assembly used to distribute and control electrical energy for all types of loads, intended for

industrial, commercial and similar applications where operation by ordinary persons is not

intended

Note 1 to entry: It is not excluded for a PSC-assembly to be located in an area accessible to ordinary persons.

3.1.102
test situation

condition of a PSC-assembly or part of it in which the relevant main circuits are open on its

supply side but not necessarily isolated whilst the associated auxiliary circuits are connected,

allowing operational tests of the incorporated device(s)
3.1.103
form of internal separation
classification of physical separation within a PSC-assembly
3.1.104
(electric) actuator
device that produces a specified movement when excited by an electric signal
[SOURCE: IEC 60050-151:2001, 151-13-49]
3.1.105
distribution circuit
electric circuit supplying one or more distribution boards
[SOURCE: IEC 60050-826:2004, 826-14-02]
3.1.106
final circuit

electric circuit intended to supply directly electric current to current using equipment or socket

outlets
[SOURCE: IEC 60050-826:2004, 826-14-03]
3.2 Constructional units of assemblies
Replacement of the title:
3.2 Constructional units of PSC-assemblies
Additional terms and definitions:
3.2.101
withdrawable part

removable part intended to be moved from the connected position to the isolated position and

to a test position, if any, whilst remaining mechanically attached to the PSC-assembly

---------------------- Page: 9 ----------------------
– 8 – IEC 61439-2:2020 © IEC 2020
3.2.102
test position

position of a withdrawable part in which the relevant main circuits are open on its supply side

but not necessarily isolated and in which the auxiliary circuits are connected allowing

operation tests of the incorporated device(s), the withdrawable part remaining mechanically

attached to the PSC-assembly

Note 1 to entry: The opening can also be achieved without any mechanical movement of the withdrawable part by

operation of a suitable device.
3.2.103
isolated position

position of a withdrawable part in which an isolating distance is established in main and

auxiliary circuits on its supply side, the withdrawable part remaining mechanically attached to

the PSC-assembly

Note 1 to entry: The isolating distance can also be established without any mechanical movement of the

withdrawable part by operation of a suitable device, e.g. a disconnector in accordance with IEC 60947-3.

3.2.104
isolating distance

clearance between open contacts of withdrawable parts meeting the safety requirements

specified for disconnectors

[SOURCE: IEC 60050-441:2000, 441-17-35, modified – The context information has been

moved to after contacts and changed.]
3.4 Structural parts of assemblies
Addition:
3.4.101
active cooling

use of equipment mounted on or within the assembly, installed to reduce or control the

assembly’s internal air temperature during normal operation, which requires energization to

operate

Note 1 to entry: Examples include fans, internal air conditioning, heat exchangers, etc.

3.4.102
pressure relief flap

mechanical component provided to limit the pressure rise in case of internal arc-faults

Additional terms and definitions:
3.101 Electrical connections of functional units
3.101.1
disconnectable connection

connection which is connected or disconnected by manual operation of the connecting means

without a tool
3.101.2
withdrawable connection

connection which is connected or disconnected by bringing the functional unit into the

connected or isolated position
---------------------- Page: 10 ----------------------
IEC 61439-2:2020 © IEC 2020 – 9 –
3.102 Gangways within PSC-assemblies
3.102.1
operating gangway within a PSC-assembly

space to be used by the operator for the proper operation and supervision of the PSC-

assembly
3.102.2
maintenance gangway within a PSC-assembly

space which is accessible to authorized personnel only and primarily intended for use when

servicing the installed equipment
3.103 Location
3.103.1
location with restricted access

location accessible for all persons who are permitted to have access to the location (e.g.

private housing, private parking areas or similar places)
3.103.2
location with non-restricted access
location accessible for all persons, e.g. the access is given in a public area
4 Symbols and abbreviations
Clause 4 of IEC 61439-1:2020 is applicable.
5 Interface characteristics
Clause 5 of IEC 61439-1:2020 is applicable, except as follows.
5.1 General
Replacement:

The characteristics of the PSC-assembly shall ensure compatibility with the ratings of the

circuits to which it is connected and the installation conditions. These characteristics shall be

declared by the PSC-assembly manufacturer using the criteria identified in 5.2 to 5.6 of

IEC 61439-1:2020, as amended by this document.

The specification schedule detailed in the informative Annex AA is intended to help the user

and the PSC-assembly manufacturer to meet this objective, whether the user:

– selects catalogue products, the characteristics of which meet their needs, and the

requirements of this document; and/or,
– makes a specific agreement with the manufacturer.
NOTE Annex AA also relates to the topics dealt with in Clauses 6 and 7.

In some cases, information provided by the PSC-assembly manufacturer may take the place

of an agreement.
5.3.3 Group rated current of a main circuit (I
Addition:

For further information on the assumed loading of the outgoing circuits, see 5.4.

---------------------- Page: 11 ----------------------
– 10 – IEC 61439-2:2020 © IEC 2020
5.4 Rated diversity factor (RDF)
Addition:

In the absence of an agreement between the assembly manufacturer and the user concerning

the actual load currents, the assumed loading of the outgoing circuits of the assembly or

group of outgoing circuits may be based on the values in Table 101.

For a motor or electric actuator circuit, the assumed load current is the rated current of the

motor multiplied with the loading factor of Table 101. If only the rated voltage and rated power

of the motor is provid
...

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