IEC 61439-6:2012

Low-voltage switchgear and controlgear assemblies - Part 6: Busbar trunking systems (busways)

IEC 61439-6:2012 lays down the definitions and states the service conditions, construction requirements, technical characteristics and verification requirements for low voltage BTS (see 3.101) as follows:
- BTS 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.;
- BTS intended for use in connection with the generation, transmission, distribution and conversion of electric energy, and for the control of electric energy consuming equipment;
- BTS designed for use under special service conditions, for example in ships, in rail vehicles, and for domestic applications (operated by unskilled persons), provided that the relevant specific requirements are complied with;
- BTS designed for electrical equipment of machines. Supplementary requirements for BTS forming part of a machine are covered by the IEC 60204 series. This first edition of IEC 61439-6 cancels and replaces the third edition of IEC 60439-2 (2000) and its Amendment 1 (2005), and constitutes a technical revision. This edition of IEC 61439-6 includes the following significant technical changes with respect to the latest edition of IEC 60439-2:
- alignment on the second edition of IEC 61439-1 (2011) regarding the structure and technical content, as applicable;
- introduction of new verifications, accordingly;
- correction of inconsistencies in resistance, reactance and impedance measurements and calculations;
- numerous editorial improvements.
This publication is to be read in conjunction with IEC 61439-1:2011.

Ensembles d'appareillage à basse tension - Partie 6: Systèmes de canalisation préfabriquée

La CEI 61439-6:2012 formule les définitions et indique les conditions d'emploi, les exigences de construction, les caractéristiques techniques et les exigences de vérification pour les SCP à basse tension (voir 3.101), comme suit:
- SCP dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu;
- SCP 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;
- SCP conçus pour être utilisés dans des conditions spéciales d'emploi, par exemple, à bord de navires et de véhicules ferroviaires, et pour des applications domestiques (utilisation par des personnes non qualifiées), sous réserve que les autres exigences spécifiques correspondantes soient respectées;
- SCP conçus pour l'équipement électrique des machines. Les exigences supplémentaires relatives aux SCP faisant partie intégrante d'une machine sont couvertes par la série CEI 60204. Cette première édition de la CEI 61439-6 annule et remplace la troisième édition de la CEI 60439-2 (2000) et son Amendement 1 (2005), dont elle constitue une révision technique. Cette édition de la CEI 61439-6 inclut les modifications techniques majeures suivantes par rapport à la dernière édition de la CEI 60439-2:
- alignement sur la deuxième édition de CEI 61439-1 (2011) concernant la structure et le contenu technique, selon le cas;
- introduction de nouvelles vérifications, en conséquence;
- correction des incohérences en termes de mesures et de calculs des valeurs de résistance, de réactance et d'impédance;
- nombreuses améliorations rédactionnelles.
Cette publication doit être lue conjointement avec la CEI 61439-1:2011.

General Information

• Status: Published
• Publication Date: 22-May-2012
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• ICS: 33.200 - Telecontrol. Telemetering
• Technical Committee: SC 121B - Low-voltage switchgear and controlgear assemblies
• Drafting Committee: MT 3 - TC 121/SC 121B/MT 3
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jun-2012
• Completion Date: 23-May-2012

Relations

• Replaces: IEC 60439-2:2000/AMD1:2005 - Amendment 1 - Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
• Effective Date: 05-Sep-2023
• Replaces: IEC 60439-2:2000 - Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61439-6 ®
Edition 1.0 2012-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –
Part 6: Busbar trunking systems (busways)

Ensembles d'appareillage à basse tension –
Partie 6: Systèmes de canalisation préfabriquée

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 Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland 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.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: [e-mail].

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.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.
Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur
Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: [e-mail].
IEC 61439-6 ®
Edition 1.0 2012-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –

Part 6: Busbar trunking systems (busways)

Ensembles d'appareillage à basse tension –

Partie 6: Systèmes de canalisation préfabriquée

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 29.130.20 ISBN 978-2-83220-084-1

– 2 – 61439-6 © IEC:2012
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols and abbreviations . 8
5 Interface characteristics . 8
6 Information . 12
7 Service conditions . 12
8 Constructional requirements . 13
9 Performance requirements . 14
10 Design verifications . 15
11 Routine verifications . 27
Annexes . 28
Annex C (informative) Specification schedule . 29
Annex D (informative) Design verification . 33
Annex AA (informative) Voltage drop of the system. 34
Annex BB (informative) Phase conductor characteristics . 35
Annex CC (informative) Fault-loop zero-sequence impedances . 37
Annex DD (informative) Fault-loop resistances and reactances . 39
Annex EE (informative) Determination of the magnetic field in the vicinity of the BTS . 41
Bibliography . 42

Figure 101 – Mechanical load test of a straight unit . 16
Figure 102 – Mechanical load test of a joint . 16
Figure 103 – Test arrangement for verification of a fire-barrier BTU . 27
Figure BB.1 – Phase conductors characteristics determination . 35
Figure CC.1 – Fault loop zero-sequence impedances determination . 37
Figure DD.1 – Fault loop resistances and reactances determination . 39
Figure EE.1 – Magnetic field measurement arrangement . 41

Table 101 – Rated diversity factor for a tap-off unit . 10
Table 102 – Phase conductor characteristics . 11
Table 103 – Fault-loop characteristics . 11
Table 104 – Characteristics to be used for fault currents calculations . 12
Table 105 – Conditioning for the thermal cycling test . 18
Table C.1 – User specification schedule . 29
Table D.1 – Design verifications . 33

61439-6 © IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 6: Busbar trunking systems (busways)

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 61439-6 has been prepared by subcommittee 17D: Low-voltage
switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and
controlgear.
This first edition of IEC 61439-6 cancels and replaces the third edition of IEC 60439-2 (2000)
and its Amendment 1 (2005), and constitutes a technical revision.
This edition of IEC 61439-6 includes the following significant technical changes with respect
to the latest edition of IEC 60439-2:
• alignment on the second edition of IEC 61439-1 (2011) regarding the structure and
technical content, as applicable;
• introduction of new verifications, accordingly;
• correction of inconsistencies in resistance, reactance and impedance measurements and
calculations;
• numerous editorial improvements.

– 4 – 61439-6 © IEC:2012
The text of this standard is based on the following documents:
FDIS Report on voting
17D/452/FDIS 17D/454/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 the second edition of 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” o
...