IEC TR 61439-0:2010
(Main)Low-voltage switchgear and controlgear assemblies - Part 0: Guide to specifying assemblies
Low-voltage switchgear and controlgear assemblies - Part 0: Guide to specifying assemblies
IEC/TR 61439-0:2010(E) Within the IEC 61439 series of standards for low-voltage switchgear and controlgear assemblies (ASSEMBLIES), there are system and application details that need to be specified by the user to enable the manufacturer to produce an ASSEMBLY that meets the needs and expectations of the user. IEC/TR 61439-0:2010(E) identifies, from the user's perspective, those functions and characteristics that should be defined when specifying ASSEMBLIES. It provides:
- an explanation of the ASSEMBLY characteristics and options within the IEC 61439 series;
- a guidance on how to select the appropriate option and to define characteristics so as to meet specific application needs, using a functional approach; and
- an assistance in the specification of ASSEMBLIES.
General Information
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Standards Content (Sample)
IEC/TR 61439-0
®
Edition 1.0 2010-10
TECHNICAL
REPORT
Low-voltage switchgear and controlgear assemblies –
Part 0: Guidance to specifying assemblies
IEC/TR 61439-0:2010(E)
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IEC/TR 61439-0
®
Edition 1.0 2010-10
TECHNICAL
REPORT
Low-voltage switchgear and controlgear assemblies –
Part 0: Guidance to specifying assemblies
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XA
ICS 29.130.20 ISBN 978-2-88912-209-7
® Registered trademark of the International Electrotechnical Commission
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– 2 – TR 61439-0 © IEC:2010(E)
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.9
2 Normative references .9
3 Terms and definitions .9
4 Application of ASSEMBLIES within the IEC 61439 series .10
4.1 General .10
4.2 ASSEMBLY design and verification.10
4.3 Service conditions and interface characteristics .10
4.4 Design.11
5 Electrical system .11
5.1 General .11
5.2 Earthing system .11
5.3 Nominal voltage .11
5.4 Overvoltage category (OVC).12
5.5 Unusual voltage transients, temporary overvoltages.12
5.6 Rated frequency f (Hz).13
n
5.7 Additional on-site testing requirements: wiring, operational performance and
function .13
6 Short-circuit withstand capability .13
6.1 General .13
6.2 Prospective short-circuit current at supply terminals I (kA) .14
cp
6.3 Prospective short-circuit current in the neutral.14
6.4 Prospective short-circuit current in the protective circuit .14
6.5 Short-circuit protective device (SCPD) .14
6.6 Co-ordination of short-circuit protective devices including external short-
circuit protective device details.15
6.7 Data associated with loads likely to contribute to the short-circuit current.16
7 Protection of persons against electric shock .16
7.1 General .16
7.2 Basic protection (protection against direct contact).16
7.2.1 General .16
7.2.2 Basic insulation provided by insulating material .16
7.2.3 Barriers or enclosures .16
7.3 Fault protection (protection against indirect contact).17
7.3.1 General .17
7.3.2 Protection by automatic disconnection of the supply.17
7.3.3 Electrical separation .18
7.3.4 Protection by total insulation.18
8 Installation environment.19
8.1 General .19
8.2 Location type.19
8.3 Protection against ingress of solid foreign bodies and ingress of water.19
8.4 External mechanical impact.20
8.5 Resistance to UV radiation .20
8.6 Resistance to corrosion .20
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TR 61439-0 © IEC:2010(E) – 3 –
8.7 Ambient air temperature .20
8.8 Maximum relative humidity .21
8.9 Pollution degree .21
8.10 Altitude.22
8.11 EMC environment.22
8.12 Special service conditions .23
8.12.1 General .23
8.12.2 Climatic conditions .23
8.12.3 Protection against ingress of solid foreign bodies and ingress of
water .23
8.12.4 Shock, vibration, and external mechanical impact (IK) .23
8.12.5 Fire and explosion hazards.24
8.12.6 Exceptional overvoltages.24
8.12.7 EMC environment .24
9 Installation method .24
9.1 General .24
9.2 Assembly type.24
9.3 Portability.25
9.4 Maximum overall dimensions and weight.25
9.5 External conductor type(s).25
9.6 Direction(s) of external conductors .25
9.7 External conductor material.26
9.8 External phase conductor, cross-sections, and terminations.26
9.9 External PE, N, PEN conductors cross-sections, and terminations .26
9.10 Special terminal identification requirements.27
10 Storage and handling .27
10.1 General .27
10.2 Maximum dimensions and weight of transport units .27
10.3 Methods of transport (e.g. forklift, crane).27
10.4 Environmental conditions different from the service conditions .27
10.5 Packing details.27
11 Operating arrangements.28
11.1 General .28
11.2 Access to manually operated devices .28
11.3 Isolation of functional units for maintenance or service.28
12 Maintenance and upgrade capabilities .29
12.1 General .29
12.2 Requirements related to accessibility for inspection and similar operations .29
12.3 Requirements related to accessibility in service by authorized persons .29
12.4 Requirements related to extension under voltage .30
12.5 Protection against direct contact with hazardous live internal parts during
maintenance or upgrade.30
12.6 Removable functional units – methods of connection.30
12.7 Operating and maintenance gangways within an ASSEMBLY .31
12.8 Internal separation .31
13 Current carrying capability.31
13.1 General .31
13.2 Rated current I (A) (maximum current allowable) .32
nA
13.3 Rated current of circuits I (A) .32
nc
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13.4 Rated diversity factor (RDF) .32
13.5 Ratio of cross-section of the neutral conductor to phase conductors.32
13.5.1 General .32
2
13.5.2 Phase conductors up to and including 16 mm .33
2
13.5.3 Phase conductors above 16 mm .33
14 ASSEMBLY design and routine verification processes .33
14.1 Design verification.33
14.1.1 Object .33
14.1.2 Methods .33
14.1.3 Records.33
14.2 Routine verification.34
14.2.1 General .34
14.2.2 Records.34
Annex A (informative) Cross-section of copper conductors suitable for connection to
terminals for external conductors .36
Annex B (informative) Forms of internal separation (see 12.8) .37
Annex C (informative) Items subject to agreement between the ASSEMBLY
manufacturer and the user for IEC 61439-2 ASSEMBLIES.41
Annex D (informative) Specification guidance for future IEC 61439-3.47
Annex E (informative) Specification guidance for future IEC 61439-4.48
Annex F (informative) Specification guidance for future IEC 61439-5 .49
Annex G (informative) Specification guidance for future IEC 61439-6 .50
Bibliography.51
Figure 1 – Required rated impulse withstand voltage .35
Figure B.1 – Symbols used in Figures B.2 and B.3.38
Figure B.2 – Forms 1 and 2 .39
Figure B.3 – Forms 3 and 4 .40
Table A.1 – Cross-section of copper conductors suitable for connection to terminals
for external conductors .36
Table B.1 – Forms of internal separation .37
Table C.1 – Items subject to agreement between the ASSEMBLY manufacturer and the
user .41
Table C.2 – Examples of optional items subject to agreement between the ASSEMBLY
manufacturer and the user .45
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TR 61439-0 © IEC:2010(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 0: Guidance to specifying assemblies
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC/TR 61439-0, which is a technical report, has been prepared by subcommittee 17D: Low-
voltage switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear
and controlgear.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
17D/402/DTR 17D/421/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
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This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 web site.
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.
A bilingual version of this publication may be issued at a later date.
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TR 61439-0 © IEC:2010(E) – 7 –
INTRODUCTION
For the purposes of this technical report, the user is the party who specifies or selects the
ASSEMBLY characteristics. The user may be the same party as the one who will use and
operate the ASSEMBLY, or someone acting on their behalf. The aim of this technical report is to
provide the user with guidance on the specification that should be provided in order to
achieve the desired design of an assembly. Throughout this technical report, the term
ASSEMBLY is used for a low-voltage switchgear and controlgear assembly. The term
“manufacturer” refers to the ASSEMBLY manufacturer unless specifically noted otherwise.
The purpose of the IEC 61439 series of standards is to harmonize as far as practicable, all
the general rules and requirements that apply to ASSEMBLIES. The series further seeks, in
order to obtain uniformity of requirements for ASSEMBLIES, consistency in the verification of
ASSEMBLIES and to avoid the need for verification to other standards.
All those requirements for the various ASSEMBLIES that can be considered as general, together
with specific subjects of wide interest and application, e.g. temperature rise, dielectric
properties, have therefore been gathered in Part 1 of IEC 61439 as general rules. For each
type of ASSEMBLY only two main standards are necessary to determine all requirements and
the corresponding methods of verification:
1) the standard giving the general rules and designated “Part 1”, and
2) the specific ASSEMBLY standard, hereinafter referred to as the relevant ASSEMBLY
standard.
The IEC 61439 series of standards encompasses ASSEMBLIES for a wide variety of uses, some
of which have specific needs as dictated by their particular application. In order to define
clearly these specific needs, relevant ASSEMBLY standards focussed on a particular type of
application have been (or are being) developed. These are identified as IEC 61439-2 to
IEC 61439-6, inclusive (see list below). Each relevant ASSEMBLY standard with reference to
IEC 61439-1, the general rules, as appropriate, specifies the characteristics and performance
required by an ASSEMBLY within its defined scope of application. Each relevant ASSEMBLY
standard includes, as an annex, a template for “items subject to agreement between the
ASSEMBLY manufacturer and the user” to facilitate the specifying of an ASSEMBLY. These are
reproduced and explained in this technical report.
Within this technical report, reference to IEC 61439 means the series of ASSEMBLY standards,
including:
• IEC 61439-1(2009), Low-voltage switchgear and controlgear assemblies – Part
1:General rules
• IEC 61439-2(2009), Low-voltage switchgear and controlgear assemblies – Part
2:Power switchgear and controlgear assemblies
• IEC 61439-3 (in preparation), Low-voltage switchgear and controlgear assemblies
– Part 3: Distribution boards intended to be operated by ordinary persons (DBO)
(to supersede IEC 60439-3)
• IEC 61439-4 (in consideration), Low-voltage switchgear and controlgear
assemblies – Part 4: Assemblies for construction sites (to supersede IEC 60439-4)
• IEC 61439-5 (to be published), Low-voltage switchgear and controlgear
assemblies – Part 5:Assemblies for power distribution in public networks (to
supersede IEC 60439-5)
• IEC 61439-6 (in preparation), Low-voltage switchgear and controlgear assemblies
– Part 6:Busbar trunking systems (busways) (to supersede IEC 60439-2)
A reference to “general rules” means a reference to IEC 61439-1(2009).
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A reference to “ASSEMBLY standard” means the relevant part of the IEC 61439 series (e.g. Part
2, 3, etc.).
A reference to “product standard” means the relevant part or parts of the IEC standard for the
components used in the ASSEMBLY (e.g. IEC 60947-2 for circuit breakers).
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TR 61439-0 © IEC:2010(E) – 9 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 0: Guidance to specifying assemblies
1 Scope
Within the IEC 61439 series of standards for low-voltage switchgear and controlgear
assemblies (ASSEMBLIES), there are system and application details that need to be specified
by the user to enable the manufacturer to produce an ASSEMBLY that meets the needs and
expectations of the user. This technical report identifies, from the user’s perspective, those
functions and characteristics that should be defined when specifying ASSEMBLIES. It provides:
– an explanation of the ASSEMBLY characteristics and options within the IEC 61439 series;
– a guidance on how to select the appropriate option and to define characteristics so as to
meet specific application needs, using a functional approach; and
– an assistance in the specification of ASSEMBLIES.
References within this technical report to the interface characteristics of an ASSEMBLY and the
requirements with which they will comply assume that the ASSEMBLY is designed,
manufactured, and verified in accordance with the relevant IEC 61439 standard.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
CISPR 11, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60364-6, Low-voltage electrical installations – Part 6: Verification
IEC 60445, Basic and safety principles for man-machine interface, marking and identification
– Identification of equipment terminals, conductor terminations and conductors
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 61439-1:2009, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
IEC 62262, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in the relevant ASSEMBLY
standard apply (e.g. IEC 61439-2).
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4 Application of ASSEMBLIES within the IEC 61439 series
4.1 General
ASSEMBLIES manufactured in accordance with the relevant ASSEMBLY standard of the
IEC 61439 series o
...
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