IEC 61439-2:2009

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

IEC 61439-2:2009 standard defines the specific requirements of power switchgear and controlgear assemblies (PSC-ASSEMBLIES), the rated voltage of which does not exceed 1000 V a.c. or 1500 V d.c. This standard is to be read in conjunction with IEC 61439-1.
This publication is to be read in conjunction with IEC 61439-1:2009.

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

La CEI 61439-2:2009 définit les exigences spécifiques applicables aux ENSEMBLES d'appareillage de puissance (ENSEMBLES-PSC, (power switchgear and controlgear)) dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu. Cette norme doit être lue conjointement à la CEI 61439-1.
Cette publication doit être lue conjointement avec la CEI 61439-1:2009.

General Information

• Status: Published
• Publication Date: 21-Jan-2009
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121B - Low-voltage switchgear and controlgear assemblies
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 19-Aug-2011

Relations

• Revised: IEC 61439-2:2011 - Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61439-2
Edition 1.0 2009-01
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 61439-2:2009

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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IEC 61439-2
Edition 1.0 2009-01
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
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 29.130.30 ISBN 978-2-88910-516-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 61439-2 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .5
3.1 General terms .5
3.2 Constructional units of PSC-ASSEMBLIES .6
4 Symbols and abbreviations.7
5 Interface characteristics .7
6 Information .7
6.1 PSC-ASSEMBLY designation marking .7
7 Service conditions .8
8 Constructional requirements .8
9 Performance requirements .11
10 Design verification.11
11 Routine verifications .11
Annexes .15
Annex AA (informative) Forms of internal separations (see 8.101) .16
Annex BB (informative) Items subject to agreement between the ASSEMBLY
manufacturer and the user .19
Bibliography.22

Figure AA.1 – Symbols used in Figures AA.2 and AA.3.16
Figure AA.2 – Forms 1 and 2 .17
Figure AA.3 – Forms 3 and 4 .18

Table 101 – Values of assumed loading.12
Table 102 – Test voltages across the open contacts of equipment suitable for isolation.12
Table 103 – Electrical conditions for the different positions of withdrawable parts.13
Table 104 – Forms of internal separation .14

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61439-2 © IEC:2009 – 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
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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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
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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
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
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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
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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 17D: Low-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
The text of this standard is based on the following documents:
CDV Report on voting
17D/358/CDV 17D/363/RVC

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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– 4 – 61439-2 © IEC:2009
This standard is to be read in conjunction with IEC 61439-1. The provisions of the general
rules dealt with in IEC 61439-1 (hereinafter referred to as Part 1) are only applicable to this
standard insofar as they are specifically cited. When this standard states “addition”,
“modification” or “replacement”, the relevant text in Part 1 is to be adapted accordingly.
Subclauses that are numbered with a 101 (102, 103, etc.) suffix are additional to the same
subclause in Part 1.
Tables and figures in this Part 2 that are new are numbered starting with 101.
New annexes in this Part 2 are lettered AA, BB, etc.
In this standard, terms written in small capitals are defined in Clause 3.
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 publication will remain unchanged until
the maintenance result 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.

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61439-2 © IEC:2009 – 5 –
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –

Part 2: Power switchgear and controlgear assemblies



1 Scope
This clause of Part 1 is applicable except as follows.
Addition:
This standard defines the specific requirements of power switchgear and controlgear
assemblies (PSC-ASSEMBLIES), the rated voltage of which does not exceed 1000 V a.c. or
1500 V d.c.
Throughout this part, the abbreviation PSC-ASSEMBLY is used for a power switchgear and
controlgear ASSEMBLY (see 3.1.101).
This standard does not apply to the specific types of ASSEMBLIES covered by other parts of
IEC 61439.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60947-3:1999, Low-voltage switchgear and controlgear – Part 3: Switchgear,
disconnectors, switch-disconnectors and fuse-combination units
IEC 61140:2001, Protection against electric shock – Common aspects for installation and
equipment – Basic safety publication
IEC 61439-1, Low-voltage switchgear and controlgear assemblies – Part 1:General rules
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 General terms
Additional definitions:
3.1.101
power switchgear and controlgear assembly (PSC-ASSEMBLY)
low-voltage switchgear and controlgear ASSEMBLY used to distribute and control energy for all
types of loads, intended for industrial, commercial and similar applications where operation by
ordinary persons is not intended

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– 6 – 61439-2 © IEC:2009
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 operation tests of the incorporated devices
3.1.103
form of internal separation
classification of physical separation within a PSC-ASSEMBLY.
3.2 Constructional units of ASSEMBLIES
Replacement of the title:
3.2 Constructional units of PSC-ASSEMBLIES
Additional 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
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 devices, the withdrawable part remaining mechanically
attached to the PSC-ASSEMBLY
NOTE The opening may 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 The isolating distance may also be established without any mechanical movement of the withdrawable part
by operation of a suitable device.
3.2.104
isolating distance (of a withdrawable part)
clearance between open contacts meeting the safety requirements specified for disconnectors
[IEV 441-17-35: 1984. modified]
Addition:
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

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61439-2 © IEC:2009 – 7 –
3.101.2
withdrawable connection
connection which is connected or disconnected by bringing the functional unit into the
connected or isolated position
3.102 Gangways within PSC-ASSEMBLIES
3.102.1
operating gangway within a PSC-ASSEMBLIES
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-ASSEMBLIES
space which is accessible to authorized personnel only and primarily intended for use when
servicing the installed equipment
4 Symbols and abbreviations
This clause of Part 1 is applicable.
5 Interface characteristics
This clause of Part 1 is applicable except as follows.
5.3.3 Rated diversity factor (RDF)
Addition:
In the absence of an agreement between the ASSEMBLY manufacturer and 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.
5.5 Other characteristics
Replacement of item l):
l) the type of construction - fixed, removable or withdrawable parts (see 8.5.2.101 to
8.5.2.103);
Addition:
m) the form of internal separation (see 8.101);
n) the types of electrical connections of functional units (see 8.5.101).
6 Information
This clause of Part 1 is applicable except as follows
6.1 ASSEMBLY designation marking
Replacement of the title and item d):
6.1 PSC-ASSEMBLY designation marking
d) IEC 61439-2;

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– 8 – 61439-2 © IEC:2009
6.2.1 Information relating to the ASSEMBLY
Replacement of the title:
6.2.1 Information relating to the PSC-ASSEMBLY
Addition:
l) form of internal separation (see 8.101);
m) types of electrical connections of functional units (see 8.5.101).
7 Service conditions
This clause of Part 1 is applicable.
8 Constructional requirements
This clause of Part 1 is applicable except as follows.
8.2 Degree of protection provided by a ASSEMBLY enclosure
Replacement of the title:
8.2 Degree of protection provided by a PSC-ASSEMBLY enclosure
Subclause 8.2.1 of Part 1 is not applicable.
Additional subclause:
8.2.101 Degree of protection of withdrawable parts
The degree of protection indicated for PSC-ASSEMBLIES normally applies to the connected
position (see 3.2.3) of withdrawable parts. The ASSEMBLY manufacturer shall indicate the
degree of protection obtained in the other positions and during the transfer between positions.
PSC-ASSEMBLIES with withdrawable parts may be so designed that the degree of protection
applying to the connected position is also maintained in the test and isolated positions and
during transfer from one position to another.
If, after the removal of a withdrawable part, the original degree of protection is not maintained,
an agreement shall be reached between the ASSEMBLY manufacturer and user as to what
measures shall be taken to ensure adequate protection. Information provided by the ASSEMBLY
manufacturer may take the place of such an agreement.
8.3.2 Clearances
Addition:
Where functional units are mounted on withdrawable parts, the isolation provided in the
isolated position shall at least comply with the requirements in the relevant specification for
disconnectors (see IEC 60947-3). This applies with the equipment in new condition, taking
account of the manufacturing tolerances and anticipated changes in dimensions due to wear.
The isolating distance between the withdrawable unit main contacts and their associated fixed
contacts in the isolated position shall be capable of withstanding the test voltage for the
declared impulse withstand voltage as specified in Table 102.

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61439-2 © IEC:2009 – 9 –
8.4.3.2.2 Requirements for earth continuity providing protection against the
consequences of faults within the ASSEMBLY
Replacement of last paragraph:
When removable or withdrawable parts are equipped with a metal supporting surface, these
surfaces shall be considered sufficient for ensuring earth continuity of protective circuits
provided that the pressure exerted on them is sufficiently high. The continuity of the protective
circuit of a withdrawable part shall remain effective from the connected position to the isolated
position inclusively.
8.4.5.1 Devices to be operated or components to be replaced by ordinary persons
This subclause of Part 1 is not applicable.
8.4.5.2 Requirements related to accessibility in service by authorized persons
Additional subclause:
8.4.5.2.101 Operating and maintenance gangways within a PSC-ASSEMBLY
Operating and maintenance gangways (see 3.102.1 and 3.102.2) within an ASSEMBLY shall
comply with the requirements for basic protection as specified in IEC 61140. The design and
construction of such gangways shall be agreed upon between ASSEMBLY Manufacturer and User.
Recesses within a PSC-ASSEMBLY of limited depth, in the order of 1 m, are not considered to
be gangways.
8.5.2 Removable parts
Replacement of the title:
8.5.2 Removable and withdrawable parts
Additional subclauses:.
8.5.2.101 General
The removable and withdrawable parts shall be so constructed that their electrical equipment
can be safely isolated from or connected to the main circuit whilst this circuit is live. The
removable and withdrawable parts may be provided with an insertion interlock (see 3.2.5 of
Part 1). Minimum clearances and creepage distances (see 8.3 of Part 1 and 8.3.2 above)
shall be complied with in the different positions as well as during transfer from one position to
another.
NOTE It may be necessary to ensure that these operations are not performed under load.
8.5.2.102 Removable parts
Removable parts shall have a connected position (see 3.2.3 of Part 1) and a removed position
(see 3.2.4 of Part 1).
8.5.2.103 Withdrawable parts
Withdrawable parts shall have in addition an isolated position (see 3.2.103) and may have a
test position (see 3.2.102), or a test situation (see 3.1.102). They shall be distinctly located in
these positions. These positions shall be clearly discernible.

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In PSC-ASSEMBLIES with withdrawable parts all live parts shall be protected in such a manner
that they cannot unintentionally be touched when the door, if any, is open and the
withdrawable part is withdrawn from the connected position or removed. Where an obstacle or
shutter is used they shall meet the requirements of 8.4.5.2.5 of Part 1, and warning labels
shall be provided.
For the electrical conditions associated with the different positions of withdrawable parts, see
Table 103.
8.5.2.104 Interlocking and padlocking of withdrawable parts
Unless otherwise specified, withdrawable parts shall be fitted with a device, which ensures
that the apparatus can only be withdrawn and/or re-inserted after its main circuit has been
interrupted.
In order to prevent unauthorized operation, withdrawable parts may be provided with means
for a padlock or lock to secure them in one or more of their positions.
Addition:
8.5.101 Description of the types of electrical connections of functional units
The types of electrical connections of functional units within PSC-ASSEMBLIES or parts of PSC-
ASSEMBLIES can be denoted by a three-letter code:
– the first letter denotes the type of electrical connection of the main incoming circuit;
– the second letter denotes the type of electrical connection of the main outgoing circuit;
– the third letter denotes the type of electrical connection of the auxiliary circuits.
The following letters shall be used:
– F for fixed connections (see 3.101.1);
– D for disconnectable connections (see 3.101.2);
– W for withdrawable connections (see 3.101.3).
Addition:
8.101 Internal separation of PSC-ASSEMBLIES
Typical arrangements of internal separation by barriers or partitions are described in Table
104 and are classified as forms (for examples, see Annex AA).
The form of separation and higher degrees of protection shall be the subject of an agreement
between ASSEMBLY Manufacturer and User.
PSC-ASSEMBLIES can be divided to attain one or more of the following conditions between
functional units, separate compartments or enclosed protected spaces:
– protection against contact with hazardous parts. The degree of protection shall be at least
IP XXB;
– protection against the passage of solid foreign bodies. The degree of protection shall be at
least IP 2X.
NOTE The degree of protection IP 2X covers the degree of protection IP XXB.
Separation may be achieved by means of partitions or barriers (metallic or non-metallic),
insulation of live parts or the integral housing of a device e.g. a moulded case circuit breaker.
See 8.4.2.3 of Part 1 with regard to stability and durability of barriers and partitions.

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61439-2 © IEC:2009 – 11 –
See 8.4.5.2 of Part 1 and above with regard to accessibility for maintenance on isolated
functional units.
9 Performance requirements
This clause of Part 1 is applicable.
10 Design verification
This clause of Part 1 is applicable except as follows.
10.3 Degree of protection of ASSEMBLIES
Addition:
The degree of protection associated with withdrawable parts as specified in accordance with
8.2.101 shall be verified in accordance with IEC 60529.
10.9.3.2 Impulse withstand voltage test
Addition:
The impulse withstand voltage capability of the isolating distance between the withdrawable
units’ main contacts and their associated fixed contacts shall be verified to confirm
compliance with 8.3.2.
10.13 Mechanical operation
Addition:
In the case of withdrawable parts, the operating cycle includes any physical movements from
the connected to the isolated position and back to the connected position.
11 Routine verifications
This clause of Part 1 is applicable except as follows.
11.8 Mechanical operation
Replacement:
Verification shall include the checking of interlocking and locking arrangements associated
with removable and withdrawable parts.

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Table 101 – Values of assumed loading
Number of main circuits Assumed loading factor
2 and 3 0,9
4 and 5 0,8
6 to 9 inclusive 0,7
10 (and above) 0,6
Table 102 – Test voltages across the open contacts of equipment suitable for isolation
Test voltages and corresponding altitudes during test
Rated impulse
U , a.c. peak and d.c. a.c. r.m.s.
1,2/50
withstand
kV kV
voltage
U
imp
Sea   Sea

level 200 m 500 m 1000 m 2000 m level 200 m 500 m 1000 m 2000 m
kV
0,33 1,8 1,7 1,7 1,6 1,5 1,3 1,2 1,2 1,1 1,06
0,5 1,8 1,7 1,7 1,6 1,5 1,3 1,2 1,2 1,1 1,06
0,8 1,8 1,7 1,7 1,6 1,5 1,3 1,2 1,2 1,1 1,06
1,5 2,3 2,3 2,2 2,2 2,0 1,6 1,6 1,55 1,55 1,42
2,5 3,5 3,5 3,4 3,2 3,0 2,47 2,47 2,40 2,26 2,12
4 6,2 6,0 5,8 5,6 5,0 4,38 4,24 4,10 3,96 3,54
6 9,8 9,6 9,3 9,0 8,0
7,00 6,80 6,60 6,40 5,66
8 12,3 12,1 11,7 11,1 10,0 8,70 8,55 8,27 7,85 7,07
12 18,5 18,1 17,5 16,7 15,0 13,10 12,80 12,37 11,80 10,60

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61439-2 © IEC:2009             – 13 –

Table 103 – Electrical conditions for the different positions of withdrawable parts
 Position
Circuit Method of connection
Connected position Test situation/position Isolated position Removed position
(see 3.2.104) (see 3.1.101/3.2.105) (see 3.2.106) (see 3.2.108)
Incoming main circuit Incoming line plug and
socket or other connection


facilities
Outgoing main circuit Outgoing line plug and
socket or other connection
a) a)
   or          or
facilities
Auxiliary circuit Plug and socket or similar
connection facilities


Condition of circuits within withdrawable parts Live Live Dead if no backfeed is
Auxiliary circuits ready for present

operational testing
b)
Condition of outgoing PSC-ASSEMBLY terminals of main Live Live or not disconnected Dead if no backfeed is Dead if no backfeed is
circuits present present
The requirements of 8.4.4 of Part 1 shall be complied with.
Earth continuity shall be in accordance
...