SIST EN 61439-6:2012

SLOVENSKI STANDARD
SIST EN 61439-6:2012
01-november-2012
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SIST EN 60439-2:2000
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SRYH]RYDOQLVLVWHPL]ELUDOþQDYRGLOD,(&
Low-voltage switchgear and controlgear assemblies - Part 6: Busbar trunking systems
(busways) (IEC 61439-6:2012)
Niederspannungs-Schaltgerätekombinationen - Teil 6: Schienenverteilersysteme
(busways) (CEI 61439-6:2012)
Ensembles d'appareillage à basse tension - Partie 6: Systèmes de canalisation
préfabriquée (IEC 61439-6:2012)
Ta slovenski standard je istoveten z: EN 61439-6:2012
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 61439-6:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61439-6:2012

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SIST EN 61439-6:2012

EUROPEAN STANDARD
EN 61439-6

NORME EUROPÉENNE
August 2012
EUROPÄISCHE NORM

ICS 29.130.20 Supersedes EN 60439-2:2000 + A1:2005


English version


Low-voltage switchgear and controlgear assemblies -
Part 6: Busbar trunking systems (busways)
(IEC 61439-6:2012)


Ensembles d'appareillage  Niederspannungs-
à basse tension - Schaltgerätekombinationen -
Partie 6: Systèmes de canalisation Teil 6: Schienenverteilersysteme
préfabriquée (busways)
(CEI 61439-6:2012) (IEC 61439-6:2012)




This European Standard was approved by CENELEC on 2012-06-27. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61439-6:2012 E

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SIST EN 61439-6:2012
EN 61439-6:2012 - 2 -
Foreword
The text of document 17D/452/FDIS, future edition 1 of IEC 61439-6, prepared by IEC/TC SC 17D
"Low-voltage switchgear and controlgear assemblies" of IEC TC 17 "Switchgear and controlgear" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61439-6:2012.
The following dates are fixed:
(dop) 2013-03-27
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2015-06-27
• latest date by which the national
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60439-2:2000 + A1:2005.

EN 61439-6:2012 includes the following significant technical changes with respect to
EN 60439-2:2000 + A1:2005:
- alignment of the second edition of EN 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 standard is to be read in conjunction with EN 61439-1:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).

For the relationship with EU Directive see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 61439-6:2012 was approved by CENELEC as a European
Standard without any modification.
The Bibliography of EN 61439-1:2011 is applicable with the addition of the following notes for the standards
indicated:

IEC 60570:2003 NOTE Harmonised as EN 60570:2003 (modified).
IEC 60909-0:2001 NOTE Harmonised as EN 60909-0:2001 (not modified).
IEC 61439 series NOTE Harmonised as EN 61439 series (partly modified).
IEC 61534 series NOTE Harmonised as EN 61534 series (not modified).

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SIST EN 61439-6:2012
- 3 - EN 61439-6:2012
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

This clause of EN 61439-1:2011 is applicable with the addition of the following references:

Publication Year Title EN/HD Year

1)
IEC 60332-3-10 2000 Tests on electric and optical fibre cables EN 60332-3-10 2009
under fire conditions -
Part 3-10: Test for vertical flame spread of
vertically-mounted bunched wires or cables -
Apparatus


IEC 60439-2 2000 Low-voltage switchgear and controlgear EN 60439-2 2000
assemblies -
Part 2: Particular requirements for busbar
trunking systems (busways)


IEC 61439-1 2011 Low-voltage switchgear and controlgear EN 61439-1 2011
assemblies -
Part 1: General rules


IEC 61786 1998 Measurement of low-frequency magnetic - -
and electric fields with regard to exposure of
human beings - Special requirements for
instruments and guidance for measurement


ISO 834-1 1999 Fire-resistance tests - Elements of building - -
construction -
Part 1: General requirements




1)
EN 60332-3-10 includes A1 to IEC 60332-3-10.

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SIST EN 61439-6:2012
EN 61439-6:2012 - 4 -
Annex ZZ
(informative)

Coverage of Essential Requirements of EU Directive 2004/108/EC
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and within its scope the standard covers all
relevant essential requirements as given in Article 1 of Annex I of the EU Directive 2004/108/EC.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directive concerned.
WARNING: Other requirements and other EU Directives may be applicable to the products falling
within the scope of this standard.

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SIST EN 61439-6:2012



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



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

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SIST EN 61439-6:2012
– 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

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SIST EN 61439-6:2012
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.

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SIST EN 61439-6:2012
– 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” 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 6 that are new are numbered starting with 101.
New annexes in this Part 6 are lettered AA, BB, etc.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
5.4
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.

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SIST EN 61439-6:2012
61439-6 © IEC:2012 – 5 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 6: Busbar trunking systems (busways)



1 Scope
NOTE 1 Throughout this part, the abbreviation BTS is used for a busbar trunking system. Where reference to
Part 1 is made, the term ASSEMBLY therefore reads as “BTS”.
This part of IEC 61439 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;
NOTE 2 Supplementary requirements for BTS in ships are covered by IEC 60092-302.
• BTS designed for electrical equipment of machines. Supplementary requirements for BTS
forming part of a machine are covered by the IEC 60204 series.
This standard applies to all BTS whether they are designed, manufactured and verified on a
one-off basis or fully standardized and manufactured in quantity.
The manufacture and/or assembly may be carried out by a manufacturer other than the
original manufacturer (see 3.10.1 and 3.10.2 of Part 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 standard.
This standard does not apply to the specific types of ASSEMBLIES covered by other parts of the
IEC 61439 series, to supply track systems in accordance with IEC 60570, to cable trunking
and ducting systems in accordance with the IEC 61084 series, nor to power track systems in
accordance with the IEC 61534 series.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60332-3-10:2000, Tests on electric and optical fibre cables under fire conditions –
Part 3-10: Test for vertical flame spread of vertically-mounted bunched wires or cables –
Apparatus
IEC 60439-2:2000, Low-voltage switchgear and controlgear assemblies – Part 2: Particular
requirements for busbar trunking systems (busways)

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SIST EN 61439-6:2012
– 6 – 61439-6 © IEC:2012
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
IEC 61786:1998, Measurement of low-frequency magnetic and electric fields with regard to
exposure of human beings – Special requirements for instruments and guidance for
measurements
ISO 834-1:1999, Fire-resistance tests – Elements of building construction – Part 1: General
requirements
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
Additional definitions:
3.101
busbar trunking system
BTS
busway
enclosed ASSEMBLY used to distribute and control electrical energy for all types of loads,
intended for industrial, commercial and similar applications, in the form of a conductor system
comprising busbars which are spaced and supported by insulating material in a duct, trough
or similar enclosure
[SOURCE: IEC 60050-441:1984, 441-12-07 modified]
Note 1 to entry: See 3.1.1 of Part 1 for the definition of ASSEMBLY.
Note 2 to entry: The BTS may consist of a full range of mechanical and electrical components such as:
– busbar trunking units with or without tap-off facilities;
– phase transposition, expansion, flexible, feeder and adapter units;
– tap-off units;
– additional conductors for communication and/or control.
Note 3 to entry: The term "busbar'' does not presuppose the geometrical shape, size and dimensions of the
conductor.
3.102
busbar trunking unit
BTU
unit of a BTS complete with busbars, their supports and insulation, external enclosure and
any fixing and connecting means to other units, with or without tap-off facilities
Note 1 to entry: BTUs may have different geometrical shapes such as straight length, elbow, tee or cross.
3.103
busbar trunking run
BT run
number of BTUs connected together to form the BTS, excluding the tap-off units
3.104
busbar trunking unit with tap-off facilities
BTU with tap-off facilities
BTU designed to enable tap-off units to be installed at one or more points as predetermined
by the original manufacturer

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SIST EN 61439-6:2012
61439-6 © IEC:2012 – 7 –
3.105
busbar trunking unit with trolley-type tap-off facilities
BTU with trolley-type tap-off facilities
BTU designed to permit the use of roller- or brush-type tap-off units
3.106
busbar trunking adapter unit
adapter BTU
BTU intended to connect two units of the same system but of different type or of different
rated current
3.107
busbar trunking thermal expansion unit
thermal expansion BTU
BTU intended to permit a certain movement in the axial direction of the BT run due to thermal
expansion of the system
Note 1 to entry: This term does not presuppose which elements permit movement, e.g. the conductors within the
enclosure or both conductors and enclosure
3.108
busbar trunking phase transposition unit
phase transposition BTU
BTU intended to change the relative positions of the phase conductors in order to balance the
inductive reactances or to transpose the phases (such as L1-L2-L3-N to N-L3-L2-L1)
3.109
flexible busbar trunking unit
flexible BTU
BTU having conductors and enclosures designed to allow a specified change of direction
during installation
3.110
busbar trunking feeder unit
feeder BTU
BTU serving as an incoming unit
Note 1 to entry: See 3.1.9 of Part 1 for the definition of incoming unit.
3.111
tap-off unit
outgoing unit, either fixed or removable, for tapping-off power from the BTU
Note 1 to entry: See 3.1.10, 3.2.1 and 3.2.2 of Part 1 for the definition of outgoing unit, fixed part and removable
part.
Note 2 to entry: A plug-in tap-off unit is a removable tap-off unit (see 8.5.2) which can be connected or
disconnected by manual operation
3.112
busbar trunking unit for building movements
BTU for building movements
BTU intended to allow for building movements due to thermal expansion, contraction and/or
flexing of the building
3.113
busbar trunking fire barrier unit
fire barrier BTU
BTU or a part of, intended to prevent the propagation of fire through building divisions for a
specified time under fire conditions

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SIST EN 61439-6:2012
– 8 – 61439-6 © IEC:2012
4 Symbols and abbreviations
This clause of Part 1 is applicable except as follows.
Addition:
Symbol / Term Subclause
Abbreviation
k temperature factor of the BTS 5.3.1
1A
k
temperature factor of a circuit 5.3.2
1c
k mounting factor of a circuit 5.3.2
2c
R, X, Z phase conductor and fault-loop characteristics 5.101

5 Interface characteristics
This clause of Part 1 is applicable except as follows.
5.1 General
Replacement:
The characteristics of the BTS shall ensure compatibility with the ratings of the circuits to
which it is connected and the installation conditions and shall be declared by the BTS
manufacturer using the criteria identified in 5.2 to 5.6 and 5.101 to 5.102.
The specification schedule according to informative Annex C is intended to help the user and
the BTS manufacturer to meet this objective, whether the user:
• select catalogue products the characteristics of which meet their needs, and the
requirements of this standard,
• and/or make a specific agreement with the manufacturer.
NOTE Annex C also relates to the topics dealt with in Clauses 6 and 7.
In some cases information provided by the BTS manufacturer may take the place of an
agreement.
5.2.4 Rated impulse withstand voltage (U ) (of the ASSEMBLY)
imp
Replacement of the NOTE:
NOTE Unless otherwise specified, the rated impulse withstand voltage is selected according to overvoltage
category IV (origin of installation level) or III (distribution circuit level) as given in Table G.1 of Part 1.
5.3.1 Rated current of the ASSEMBLY (I )
nA
Addition:
NOTE 4 Where the BTS is not equipped with a single incoming unit at one end of the BT run, (e.g. incoming unit
not installed at one end of the BTS, or more than one incoming unit), the rated currents will be subject to
agreement between the user and the manufacturer.
The rated current shall apply for a specified mounting orientation (see 5.3.2). However the
influence of the mounting orientation may be ignored for short (e.g. less than 3 m long)
vertical sections in a horizontal BTS.

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SIST EN 61439-6:2012
61439-6 © IEC:2012 – 9 –
The BTS manufacturer may state the rated currents of the BTS for different ambient
temperatures for example by means of the following formula:
I’ = k I
nA 1A nA
where k is a temperature factor, equal to 1 at an ambient air temperature of 35 °C.
1A
In case of significant harmonic currents, special agreement shall be made for a reduction
factor, if necessary.
5.3.2 Rated current of a circuit (I )
nc
Addition:
The rated current (I ) of each circuit (i.e. incoming unit, BTU, tap-off unit, outgoing circuit)
nc
shall be equal to or higher than its assumed loading. For tap-off units provided with more than
one main outgoing circuit, see also 5.4.
The rated current shall apply for specified mounting conditions. Mounting conditions may
include orientation and position, as follows:
a) orientation
Orientation may be horizontal or vertical.
Unless otherwise specified, the reference orientation is horizontal.
b) position
Position may be for example edgewise or flatwise for a BT run, and/or below or on top of
the BTU for a tap-off unit.
The BTS manufacturer may state different rated currents for different ambient temperatures
and/or mounting conditions, where applicable, for example by means of the following formula:
I’ = k k I
nc 1c 2c nc
where
k is a temperature factor, equal to 1 at an ambient air temperature of 35 °C;
1c
k is a mounting factor, equal to 1 in the reference mounting conditions.
2c
In case of significant harmonic currents, special agreement shall be made for a reduction
factor, if necessary.
5.4 Rated diversity factor (RDF)
Replacement:
For the whole BTS, unless otherwi
...