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

IEC 61439-2:2011 defines the specific requirements of power switchgear and controlgear assemblies (PSC-ASSEMBLIES) as follows:
- ASSEMBLIES for which the rated voltage does not exceed 1 000 V in case of a.c. or 1 500 V in case of d.c.;
- stationary or movable ASSEMBLIES with or without enclosure;
- ASSEMBLIES intended for use in connection with the generation, transmission, distribution and conversion of electric energy, and for the control of electric energy consuming equipment;
- 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;
- ASSEMBLIES designed for electrical equipment of machines.
Supplementary requirements for ASSEMBLIES forming part of a machine are covered by the IEC 60204 series. This second edition cancels and replaces the first edition published in 2009. It constitutes a technical revision. This second edition includes the following significant technical changes with respect to the last edition of IEC 61439-2:
- clarification of the scope;
- revision of requirements for withdrawable and removable parts;
- revision of mechanical impact test (10.2.6);
- extension of Table 101;
- review of Table BB.1 to reflect modified requirements and verifications;
- general editorial review.
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 61439-2:2011 définit les exigences spécifiques applicables aux ensembles d'appareillage de puissance (ENSEMBLES EAP) comme suit:
- ENSEMBLES dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu;
- 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 et la commande des matériels consommant de l'énergie électrique;
- 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;
- ENSEMBLES conçus pour le matériel électrique des machines. Les exigences supplémentaires pour les ENSEMBLES faisant partie d'une machine sont couvertes par la série CEI 60204. Cette seconde édition annule et remplace la première édition publiée en 2009, dont elle constitue une révision technique. Cette deuxième édition inclut les modifications techniques importantes suivantes par rapport à la dernière édition de la CEI 61439-2:
- clarification du domaine d'application;
- révision des exigences pour les parties débrochables et amovibles;
- révision de l'essai d'impact mécanique (10.2.6);
- extension du Tableau 101;
- revue du Tableau BB.1 pour refléter les exigences et les vérifications modifiées;
- revue générale de la formulation du texte.
Cette publication doit être lue conjointement avec la CEI 61439-1:2009.

General Information

Status
Published
Publication Date
18-Aug-2011
Current Stage
DELPUB - Deleted Publication
Completion Date
22-Jul-2020
Ref Project

Buy Standard

Standard
IEC 61439-2:2011 - Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies
English and French language
46 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 61439-2
Edition 2.0 2011-08
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 61439-2:2011
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2011 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by

any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or

IEC's member National Committee in the country of the requester.

If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette

publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigenda or an amendment might have been published.
 Catalogue of IEC publications: www.iec.ch/searchpub

The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).

It also gives information on projects, withdrawn and replaced publications.
 IEC Just Published: www.iec.ch/online_news/justpub

Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available

on-line and also by email.
 Electropedia: www.electropedia.org

The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions

in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical

Vocabulary online.
 Customer Service Centre: www.iec.ch/webstore/custserv

If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service

Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI

La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des

normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI

Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez

l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
 Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm

Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,

texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.

 Just Published CEI: www.iec.ch/online_news/justpub

Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles

publications parues. Disponible en-ligne et aussi par email.
 Electropedia: www.electropedia.org

Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et

définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé

Vocabulaire Electrotechnique International en ligne.
 Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm

Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du

Service clients ou contactez-nous:
Email: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
---------------------- Page: 2 ----------------------
IEC 61439-2
Edition 2.0 2011-08
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
CODE PRIX T
ICS 29.130.20 ISBN 978-2-88912-605-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 61439-2  IEC:2011
CONTENTS

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

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

2 Normative references ....................................................................................................... 5

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

4 Symbols and abbreviations ............................................................................................... 7

5 Interface characteristics ................................................................................................... 7

6 Information ....................................................................................................................... 8

7 Service conditions ............................................................................................................ 8

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

9 Performance requirements ............................................................................................. 11

10 Design verification .......................................................................................................... 11

11 Routine verification ......................................................................................................... 12

Annex AA (informative) Forms of internal separation (see 8.101) ......................................... 16

Annex BB (informative) Items subject to agreement between the ASSEMBLY

manufacturer and the user .................................................................................................... 19

Bibliography .......................................................................................................................... 23

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

Table BB.1 – Items subject to agreement between the ASSEMBLY manufacturer and the

user ...................................................................................................................................... 19

---------------------- Page: 4 ----------------------
61439-2  IEC:2011 – 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,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

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

misinterpretation by any end user.

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

transparently to the maximum extent possible in their national and regional publications. Any divergence

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

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) 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.

This second edition cancels and replaces the first edition published in 2009. It constitutes a

technical revision.

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

last edition of IEC 61439-2:
• clarification of the scope;
• revision of requirements for withdrawable and removable parts;
• revision of mechanical impact test (10.2.6);
• extension of Table 101;
---------------------- Page: 5 ----------------------
– 4 – 61439-2  IEC:2011
• review of Table BB.1 to reflect modified requirements and verifications;
• general editorial review.
The text of this standard is based on the following documents:
FDIS Report on voting
17D/440/FDIS 17D/445/RVD

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.

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.

NOTE Throughout the IEC 61439 series of standards, the term ASSEMBLY (see 3.1.1 of Part 1) 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 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: 6 ----------------------
61439-2  IEC:2011 – 5 –
LOW-VOLTAGE SWITCHGEAR AND
CONTROLGEAR ASSEMBLIES –
Part 2: Power switchgear and controlgear assemblies
1 Scope

NOTE 1 Throughout this part, the abbreviation PSC-ASSEMBLY (see 3.1.101) is used for a power switchgear and

controlgear ASSEMBLY.

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

assemblies (PSC-ASSEMBLIES) as follows:

– ASSEMBLIES for which the rated voltage does not exceed 1 000 V in case of a.c. or

1 500 V in case of d.c.;
– stationary or movable ASSEMBLIES with or without enclosure;
– ASSEMBLIES intended for use in connection with the generation, transmission,

distribution and conversion of electric energy, and for the control of electric energy

consuming equipment;

– 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.

– ASSEMBLIES designed for electrical equipment of machines. Supplementary

requirements for ASSEMBLIES forming part of a machine are covered by the IEC 60204

series.

This standard 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 may be carried out other than by the original manufacturer

(see 3.10.1).

This standard does not apply to individual devices and self-contained components, such as

motor starters, fuse switches, electronic equipment, etc. which will comply with the relevant

product standards.This standard 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.

2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:

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

switch-disconnectors and fuse-combination units

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

equipment
---------------------- Page: 7 ----------------------
– 6 – 61439-2  IEC:2011

IEC 61439-1:2011, 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

NOTE 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 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.
___________
To be published.
---------------------- Page: 8 ----------------------
61439-2  IEC:2011 – 7 –
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

[IEC 60050-441:1984, 441-17-35, 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
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.
5.4 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.
---------------------- Page: 9 ----------------------
– 8 – 61439-2  IEC:2011
5.6 Other characteristics
Replacement of item l):

l) the type of construction – fixed, removable or withdrawable parts (see 8.5.1 and 8.5.2 of

Part 1);
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;
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 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
Replacement of text:

Where a degree of protection provided by a PSC-ASSEMBLY enclosure against mechanical

impact is declared by the original manufacturer this shall be verified in accordance with

IEC 62262 (see 10.2.6).
Additional subclause:
8.2.101 PSC-ASSEMBLY with 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.
---------------------- Page: 10 ----------------------
61439-2  IEC:2011 – 9 –

If, after the removal of a withdrawable part, it is not possible to maintain the original degree of

protection e.g. by closing a door, 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:

For 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.
8.4.3.2.2 Requirements for earth continuity providing protection against the
consequences of faults within the ASSEMBLY
Replacement of the title:
8.4.3.2.2 Requirements for earth continuity providing protection against the
consequences of faults within the PSC-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.
8.4.6.1 Devices to be operated or components to be replaced by ordinary persons
This subclause of Part 1 is not applicable.
8.4.6.2 Requirements related to accessibility in service by authorized persons
Additional subclause:
8.4.6.2.101 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
Replacement of text:
---------------------- Page: 11 ----------------------
– 10 – 61439-2  IEC:2011

The removable and withdrawable parts shall be so constructed that their electrical equipment

can be safely removed and/or 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).

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.

Additional subclauses:
8.5.2.101 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.

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 8.4.6.2.5 of Part 1.

For the electrical conditions associated with the different positions of withdrawable parts, see

Table 103.
8.5.2.102 Interlocking and padlocking of removable and withdrawable parts

Unless otherwise specified the removable and withdrawable parts shall be fitted with a device,

which ensures that the apparatus can only be removed/withdrawn and/or re-inserted after its

main circuit has been interrupted.

In order to prevent unauthorized operation the removable and withdrawable parts or their

associated ASSEMBLY location may be provided with a lockable means 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 3.2.6 of Part 1);
– D for disconnectable connections (see 3.101.1);
– W for withdrawable connections (see 3.101.2).
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).
---------------------- Page: 12 ----------------------
61439-2  IEC:2011 – 11 –

The form of separation and higher degrees of protection shall be the subject of an agreement

between ASSEMBLY manufacturer and user.

Internal separation may be used 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 (see 8.4.2.3);

– protection against the passage of solid foreign bodies. The degree of protection shall be at

least IP 2X.

NOTE 1 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.

See 8.4.6.2 of Part 1 and above with regard to accessibility for maintenance on isolated

functional units.

NOTE 2 The internal separation described is not intended to guarantee the integrity of the ASSEMBLY in the

event of an arcing fault.
9 Performance requirements
This clause of Part 1 is applicable.
10 Design verification
This clause of Part 1 is applicable except as follows.
10.2.6 Mechanical impact
Replacement:

When a mechanical impact test is performed, it shall be carried out according to 9.6 of

IEC 62208:2002.
10.3 Degree of protection of ASSEMBLIES
Addition:

The degree of protection associated with withdrawable parts as specified in accordance with

8.2.101 and associated with internal separation in accordance with 8.101 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:
---------------------- Page: 13 ----------------------
– 12 – 61439-2  IEC:2011

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 verification
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.