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SIST EN 60947-7-2:2009
01-september-2009
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SIST EN 60947-7-2:2003
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Low-voltage switchgear and controlgear - Part 7-2: Ancillary equipment - Protective
conductor terminal blocks for copper conductors (IEC 60947-7-2:2009)
Niederspannungsschaltgeräte - Teil 7-2: Hilfseinrichtungen - Schutzleiter-
Reihenklemmen für Kupferleiter (IEC 60947-7-2:2009)
Appareillage à basse tension - Partie 7-2: Matériel accessoires - Blocs de jonction de
conducteur de protection pour conducteurs en cuivre (CEI 60947-7-2:2009)
Ta slovenski standard je istoveten z: EN 60947-7-2:2009
ICS:
29.120.99 'UXJDHOHNWULþQDGRGDWQD Other electrical accessories
RSUHPD
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60947-7-2:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60947-7-2:2009
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SIST EN 60947-7-2:2009
EUROPEAN STANDARD
EN 60947-7-2
NORME EUROPÉENNE
June 2009
EUROPÄISCHE NORM
ICS 29.120.99; 29.130.20 Supersedes EN 60947-7-2:2002
English version
Low-voltage switchgear and controlgear -
Part 7-2: Ancillary equipment -
Protective conductor terminal blocks for copper conductors
(IEC 60947-7-2:2009)
Appareillage à basse tension - Niederspannungsschaltgeräte -
Partie 7-2: Matériels accessoires - Teil 7-2: Hilfseinrichtungen -
Blocs de jonction Schutzleiter-Reihenklemmen
de conducteur de protection für Kupferleiter
pour conducteurs en cuivre (IEC 60947-7-2:2009)
(CEI 60947-7-2:2009)
This European Standard was approved by CENELEC on 2009-06-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60947-7-2:2009 E
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SIST EN 60947-7-2:2009
EN 60947-7-2:2009 – 2 –
Foreword
The text of document 17B/1655/FDIS, future edition 3 of IEC 60947-7-2, prepared by SC 17B,
Low-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 60947-7-2 on 2009-06-01.
This European Standard supersedes EN 60947-7-2:2002.
The main technical modifications of EN 60947-7-2:2009 since EN 60947-7-2:2002 are listed below:
– requirements for tightening torques for the tests improved and referenced to Table 4 of EN 60947-1,
Annex B deleted;
– the wording of the short-time withstand current test improved in 8.4.6.
This standard shall be read in conjunction with EN 60947-1 and EN 60947-7-1. The provisions of the
general rules dealt with in EN 60947-1 and the requirements for terminal blocks of EN 60947-7-1 are
applicable to this standard, where specifically called for. Clauses and subclauses, tables, figures and
annexes thus applicable are identified by reference to EN 60947-1 or EN 60947-7-1, e.g. 1.2 of
EN 60947-1, Table 4 of EN 60947-7-1 or Annex A of EN 60947-1.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-06-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60947-7-2:2009 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 60947-7-2:2009
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Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60439-1 1999 Low-voltage switchgear and controlgear EN 60439-1 1999
A1 2004 assemblies - A1 2004
Part 1: Type-tested and partially type-tested
assemblies
IEC 60715 1981 Dimensions of low-voltage switchgear and
+ A1 1995 controlgear - Standardized mounting on rails EN 60715 2001
for mechanical support of electrical devices
in switchgear and controlgear installations
IEC 60947-1 2007 Low-voltage switchgear and controlgear - EN 60947-1 2007
Part 1: General rules
1) 2)
IEC 60947-7-1 - Low-voltage switchgear and controlgear - EN 60947-7-1 2009
Part 7-1: Ancillary equipment - Terminal
blocks for copper conductors
1)
Undated reference.
2)
Valid edition at date of issue.
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SIST EN 60947-7-2:2009
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SIST EN 60947-7-2:2009
IEC 60947-7-2
Edition 3.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 7-2: Ancillary equipment – Protective conductor terminal blocks for copper
conductors
Appareillage à basse tension –
Partie 7-2: Matériels accessoires – Blocs de jonction de conducteur de
protection pour conducteurs en cuivre
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 29.120.99; 29.130.20 ISBN 2-8318-1038-1
Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 60947-7-2:2009
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CONTENTS
FOREWORD.4
1 General .6
1.1 Scope.6
1.2 Normative references .6
2 Definitions .7
3 Classification.7
4 Characteristics .7
4.1 Summary of characteristics .7
4.2 Type of protective conductor terminal block.7
4.3 Rated and limiting values .8
4.3.1 Void.8
4.3.2 Short-time withstand current.8
4.3.3 Standard cross-sections .8
4.3.4 Rated cross-section.8
4.3.5 Rated connecting capacity.8
5 Product information .8
5.1 Marking .8
5.2 Additional information.9
6 Normal service, mounting and transport conditions.9
7 Constructional and performance requirements.9
7.1 Constructional requirements.9
7.1.1 Clamping units.9
7.1.2 Connection of support .9
7.1.3 Clearance and creepage distances.9
7.1.4 Terminal block identification and marking .10
7.1.5 Resistance to abnormal heat and fire.10
7.1.6 Rated cross-section and rated connecting capacity .10
7.1.7 Protective conductor mounting rails .10
7.2 Performance requirements .10
7.2.1 Temperature rise .10
7.2.2 Dielectric properties.10
7.2.3 Short-time withstand current.10
7.2.4 Voltage drop.10
7.2.5 Electrical performance after ageing (for screwless-type protective
conductor terminal blocks only) .11
7.3 Electromagnetic compatibility (EMC) .11
8 Tests .11
8.1 Kinds of test .11
8.2 General .11
8.3 Verification of mechanical characteristics .11
8.4 Verification of electrical characteristics.11
8.4.1 General .11
8.4.2 Void.12
8.4.3 Dielectric tests.12
8.4.4 Verification of the voltage drop .13
8.4.5 Temperature-rise test .14
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SIST EN 60947-7-2:2009
60947-7-2 © IEC:2009 – 3 –
8.4.6 Short-time withstand current test .15
8.4.7 Ageing test (for screwless-type terminal blocks only).16
8.5 Verification of thermal characteristics .17
8.6 Verification of EMC characteristics .17
Annex A (normative) Maximum short-time withstand currents allocated to the rail
profile and thermal rated current of a PEN busbar .18
Figure 1 – Arrangement for the dielectric test .12
Figure 2 – Arrangement for the voltage drop test .13
Figure 3 − Arrangement for the temperature-rise test for test group a) .15
Figure 4 − Arrangement for the temperature-rise test for test group b) .15
Figure 5 – Arrangement for the thermal short-time withstand current test.16
Table 1 − Relationship between rated cross-section and rated connecting capacity of
protective conductor terminal blocks .8
Table A.1 − Maximum short-time withstand currents allocated to the rail profile and
thermal rated current of a PEN busbar .18
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SIST EN 60947-7-2:2009
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-2: Ancillary equipment –
Protective conductor terminal blocks for copper conductors
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 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
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 60947-7-2 has been prepared by subcommittee 17B: Low-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This third edition of IEC 60947-7-2 cancels and replaces the second edition, published in
2002, and constitutes a technical revision.
The main technical modifications of this standard since this previous publication are listed
below:
– requirements for tightening torques for the tests improved and referenced to Table 4 of
IEC 60947-1, Annex B deleted;
– the wording of the short-time withstand current test improved in 8.4.6.
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SIST EN 60947-7-2:2009
60947-7-2 © IEC:2009 – 5 –
This standard shall be read in conjunction with IEC 60947-1 and IEC 60947-7-1. The
provisions of the general rules dealt with in IEC 60947-1 and the requirements for terminal
blocks of IEC 60947-7-1 are applicable to this standard, where specifically called for. Clauses
and subclauses, tables, figures and annexes thus applicable are identified by reference to
IEC 60947-1 or IEC 60947-7-1, e.g. 1.2 of IEC 60947-1, Table 4 of IEC 60947-7-1 or Annex A
of IEC 60947-1.
The text of this standard is based on the following documents:
FDIS Report on voting
17B/1655/FDIS 17B/1669/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.
A list of all the parts in the IEC 60947 series, under the general title Low-voltage switchgear
and controlgear, 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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SIST EN 60947-7-2:2009
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LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-2: Ancillary equipment –
Protective conductor terminal blocks for copper conductors
1 General
1.1 Scope
This part of IEC 60947 specifies requirements for protective conductor terminal blocks with
2
PE function up to 120 mm (250 kcmil) and for protective conductor terminal blocks with PEN
2
(AWG 8) with screw-type or screwless-type clamping
function equal to and above 10 mm
units, primarily intended for industrial applications.
NOTE AWG is the abbreviation of “American Wire Gage” [Gage (US) = Gauge (UK)]
kcmil = 1 000 cmil
1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil
1 mil = 1/1 000 inch
Protective conductor terminal blocks are used to form the electrical and mechanical
connection between copper conductors and the fixing support.
lt is applicable to protective conductor terminal blocks for the connection of round copper
2
conductors with or without special preparation having a cross-section between 0,2 mm and
2
120 mm (AWG 24 and 250 kcmil), intended to be used in circuits of a rated voltage not
exceeding 1 000 V a.c. up to 1 000 Hz or 1 500 V d.c., most commonly in conjunction with
terminal blocks according to IEC 60947-7-1.
This standard may be used as guide for
− protective conductor terminal blocks requiring the fixing of special devices to the
conductors, for example quick connect terminations or wrapped connections, etc.;
– protective conductor terminal blocks providing direct contact to the conductors by means
of edges or points penetrating the insulation, for example insulation displacement
connections, etc.
Where applicable in this standard, the term “clamping unit” has been used instead of the term
“terminal”. This is taken into account in case of reference to IEC 60947-1.
1.2 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.
IEC 60439-1:1999, Low-voltage switchgear and controlgear assemblies – Part 1: Type-tested
and partially type-tested assemblies
Amendment 1 (2004)
IEC 60715:1981, Dimensions of Iow-voltage switchgear and controlgear – Standardized
mounting on rails for mechanical support of electrical devices in switchgear and controlgear
installations
Amendment 1 (1995)
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
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SIST EN 60947-7-2:2009
60947-7-2 © IEC:2009 – 7 –
IEC 60947-7-1, Low-voltage switchgear and controlgear – Part 7-1: Ancillary equipment –
Terminal blocks for copper conductors
2 Definitions
For the purposes of this document, definitions given in IEC 60947-7-1, together with the
following definitions, apply.
2.1
protective conductor terminal block
device with one or more clamping units for connecting and/or joining protective conductors
(PE and PEN conductors) with conducting connection to their supports, which may be
designed with screw-type or screwless-type fixing means
NOTE 1 Supports are, for example, mounting rails, sheet metal cut-outs, mounting plates, etc.
NOTE 2 A protective conductor terminal block can be either partially insulated or not at all. lt does not require any
functional insulation.
2.2
partially insulated protective conductor terminal block
device which is only insulated against live parts of other devices but not against the support
itself
2.3
PEN conductor
earthed conductor combining the functions of both protective conductor and neutral conductor
NOTE The acronym PEN results from the combination of both symbols PE for the protective conductor and N for
the neutral conductor (see 2.1.15 of IEC 60947-1).
3 Classification
Distinction is made between various types of protective conductor terminal blocks as follows:
− method of fixing the protective conductor terminal block to the support;
− type of clamping units: screw-type clamping units or screwless-type clamping units;
− ability to receive conductors with or without special preparation (e.g. cable lugs);
− terminal assemblies with identical or dissimilar clamping units;
− number of clamping units on each terminal assembly;
− service conditions;
− PE or PEN functions.
4 Characteristics
4.1 Summary of characteristics
Subclause 4.1 of IEC 60947-7-1 applies.
4.2 Type of protective conductor terminal block
Subclause 4.2 of IEC 60947-7-1 applies.
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4.3 Rated and limiting values
4.3.1 Void
4.3.2 Short-time withstand current
Subclause 4.3.2 of IEC 60947-7-1 applies.
4.3.3 Standard cross-sections
Subclause 4.3.3 of IEC 60947-7-1 applies with the following addition.
In accordance with the scope of this standard, Table 1 of IEC 60947-7-1 applies only up to
2
120 mm (250 kcmil).
4.3.4 Rated cross-section
Subclause 4.3.4 of IEC 60947-7-1 applies.
4.3.5 Rated connecting capacity
Subclause 4.3.5 of IEC 60947-7-1 applies with the modification for one conductor per
clamping unit only, as for 7.4.3.1.6 of IEC 60439-1, and with the following Table 1.
Table 1 − Relationship between rated cross-section and rated connecting capacity
of protective conductor terminal blocks
Rated cross-section Rated connecting capacity
2 2
mm AWG/kcmil mm AWG/kcmil
0,2 24 0,2 24
0,34 22 0,2 – 0,34 24 – 22
0,5 20 0,2 – 0,34 – 0,5 24 – 22 – 20
0,75 18 0,34 – 0,5 – 0,75 22 – 20 – 18
1 – 0,5 – 0,75 – 1 –
1,5 16 0,75 – 1 – 1,5 20 – 18 – 16
2,5 14 1 – 1,5 – 2,5 18 – 16 – 14
4 12 1,5 – 2,5 – 4 16 – 14 – 12
6 10 2,5 – 4 – 6 14 – 12 – 10
10 8 4 – 6 – 10 12 – 10 – 8
16 6 6 – 10 – 16 10 – 8 – 6
25 4 10 – 16 – 25 8 – 6 – 4
35 2 16 – 25 – 35 6 – 4 – 2
50 0 25 – 35 – 50 4 – 2 – 0
70 00 35 – 50 – 70 2 – 0 – 00
95 000 50 – 70 – 95 0 – 00 – 000
120 250 70 – 95 – 120 00 – 000 – 250
5 Product information
5.1 Marking
A protective conductor terminal block shall be marked in a durable and legible manner with
the following:
a) the name of the manufacturer or a trade mark by which the manufacturer can be readily
identified;
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60947-7-2 © IEC:2009 – 9 –
b) a type reference permitting its identification in order to obtain relevant information from the
manufacturer or his catalogue.
5.2 Additional information
The following information shall be stated by the manufacturer, if applicable, e.g. in the
manufacturer's data sheet or his catalogue or on the packing unit:
a) IEC 60947-7-2, if the manufacturer claims compliance with this standard;
b) the rated cross-section;
c) the rated connecting capacity if different from Table 1;
d) service conditions, if different from those of Clause 6.
The manufacturer shall declare if the protective conductor terminal block rated equal to or
2
above 10 mm (AWG 8) is intended for PE function only.
NOTE No marking indicates suitability for use in both PE + PEN functions.
6 Normal service, mounting and transport conditions
Clause 6 of IEC 60947-1 applies.
7 Constructional and performance requirements
7.1 Constructional requirements
7.1.1 Clamping units
Subclause 7.1.1 of IEC 60947-7-1 applies with the following additions.
The protective conductor terminal block shall permit a reliable connection between the
conductor clamping units and the clamping unit to the support.
The clamping units shall be able to withstand the forces that can be applied through
the connected conductors and the connected support.
Compliance is checked by inspection, by the test of 8.3.3.1 and by the tests of 8.3.3.2 and
8.3.3.3 of IEC 60947-7-1.
7.1.2 Connection of support
Protective conductor terminal blocks shall be provided with means for secure attachment to
the corresponding support without risk of galvanic corrosion.
The design of the protective conductor terminal block shall clearly show how the fixation has
to be made to ensure the correct conducting connection to the appropriate support.
The clamping connection to the support shall only be released by means of tools.
The test shall be carried out in accordance with 8.3.2 of IEC 60947-7-1.
NOTE Information on mounting rails can be found in IEC 60715.
7.1.3 Clearance and creepage distances
Clearance and creepage distances do not apply to protective conductor terminal blocks.
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SIST EN 60947-7-2:2009
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NOTE The value of the clearance and creepage distances between protective conductor terminal blocks and
terminal blocks according to IEC 60947-7-1 should be as stated in 7.1.3 of IEC 60947-7-1.
7.1.4 Terminal block identification and marking
Subclause 7.1.4 of IEC 60947-7-1 applies with the following addition.
Any partially insulated protective conductor terminal block shall be coloured green and yellow.
7.1.5 Resistance to abnormal heat and fire
Subclause 7.1.5 of IEC 60947-7-1 applies.
7.1.6 Rated cross-section and rated connecting capacity
Subclause 7.1.6 of IEC 60947-7-1 applies.
7.1.7 Protective conductor mounting rails
Mounting rails may be used as protective conductor busbars, provided the values specified in
Table A.1 for thermal short-time withstand current and the thermal rated current are not
exceeded.
Other types of mounting rails may be used for this purpose if the values of Table A.1 are
comp
...