SIST EN 60947-7-1:2009

SLOVENSKI STANDARD
01-september-2009
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SIST EN 60947-7-1:2003
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Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks
for copper conductors (IEC 60947-7-1:2009)
Niederspannungsschaltgeräte - Teil 7-1: Hilfseinrichtungen - Reihenklemmen für
Kupferleiter (IEC 60947-7-1:2009)
Appareillage à basse tension - Partie 7-1: Matériels accessoires - Blocs de jonction pour
conducteurs en cuivre (CEI 60947-7-1:2009)
Ta slovenski standard je istoveten z: EN 60947-7-1:2009
ICS:
29.120.99 'UXJDHOHNWULþQDGRGDWQD Other electrical accessories
RSUHPD
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60947-7-1
NORME EUROPÉENNE
June 2009
EUROPÄISCHE NORM
ICS 29.130.20 Supersedes EN 60947-7-1:2002

English version
Low-voltage switchgear and controlgear -
Part 7-1: Ancillary equipment -
Terminal blocks for copper conductors
(IEC 60947-7-1:2009)
Appareillage à basse tension -  Niederspannungsschaltgeräte -
Partie 7-1: Matériels accessoires - Teil 7-1: Hilfseinrichtungen -
Blocs de jonction Reihenklemmen für Kupferleiter
pour conducteurs en cuivre (IEC 60947-7-1:2009)
(CEI 60947-7-1:2009)
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 60947-7-1:2009 E
Foreword
The text of document 17B/1654/FDIS, future edition 3 of IEC 60947-7-1, 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 60947-7-1 on 2009-06-01.
This European Standard supersedes EN 60947-7-1:2002.
The main technical modifications of EN 60947-7-1:2009 since EN 60947-7-1:2002 are listed below:
– added in the scope that EN 60947-7-1:2009 may be used as a guide for special types of terminal
blocks, for example with diodes or varistors or similar component holders;
– the conventional free air thermal current added in 5.2 in the list of information to be stated by the
manufacturer;
– update of 7.1.4 that the colour combination green-yellow is not allowed for terminal blocks;
– the consequences in case of failed single tests and failed tests within test sequences specified in 8.2;
– requirements regarding clearances and creepage distances replaced by reference to Annex H of
EN 60947-1, Annex A deleted;
– requirements for tightening torques for the tests improved and referenced to Table 4 of EN 60947-1,
Annex C deleted;
– in 8.3.3.3 changed reference for pull-out force to EN 60947-1;
– the wording of the test of the voltage drop improved in 8.4.4;
– the wording of the short-time withstand current test improved in 8.4.6;
– Annex D with additional requirements for test disconnect terminal blocks added. The scope has been
modified accordingly.
This standard shall be read in conjunction with EN 60947-1. The provisions of the general rules dealt with
in EN 60947-1 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, e.g. 1.2 of
EN 60947-1, Table 4 of EN 60947-1 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.
__________
– 3 – EN 60947-7-1:2009
Endorsement notice
The text of the International Standard IEC 60947-7-1:2009 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60228 NOTE  Harmonized as EN 60228:2005 (not modified).
IEC 60715 NOTE  Harmonized as EN 60715:2001 (not modified).
__________
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 60695-11-5 2004 Fire hazard testing - EN 60695-11-5 2005
Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test
arrangement and guidance
IEC 60947-1 2007 Low-voltage switchgear and controlgear - EN 60947-1 2007
Part 1: General rules
ISO 4046-4 2002 Paper, board, pulps and related terms - - -
Vocabulary -
Part 4: Paper and board grades and
converted products
IEC 60947-7-1 ®
Edition 3.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 7-1: Ancillary equipment – Terminal blocks for copper conductors

Appareillage à basse tension –
Partie 7-1: Matériels accessoires – Blocs de jonction pour conducteurs en cuivre

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.130.20 ISBN 2-8318-1038-0
– 2 – 60947-7-1 © IEC:2009
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 terminal block .7
4.3 Rated and limiting values .8
4.3.1 Rated voltages .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.9
5 Product information .9
5.1 Marking .9
5.2 Additional information.9
6 Normal service, mounting and transport conditions.10
7 Constructional and performance requirements.10
7.1 Constructional requirements.10
7.1.1 Clamping units.10
7.1.2 Mounting .10
7.1.3 Clearances and creepage distances .10
7.1.4 Terminal identification and marking .10
7.1.5 Resistance to abnormal heat and fire.11
7.1.6 Rated cross-section and rated connecting capacity .11
7.2 Performance requirements .11
7.2.1 Temperature-rise .11
7.2.2 Dielectric properties.11
7.2.3 Short-time withstand current.11
7.2.4 Voltage drop.12
7.2.5 Electrical performance after ageing (for screwless-type terminal
blocks only) .12
7.3 Electromagnetic compatibility (EMC) .12
8 Tests .12
8.1 Kinds of test .12
8.2 General .12
8.3 Verification of mechanical characteristics .13
8.3.1 General .13
8.3.2 Attachment of the terminal block on its support.13
8.3.3 Mechanical properties of clamping units .14
8.4 Verification of electrical characteristics.15
8.4.1 General .15
8.4.2 Verification of clearances and creepage distances .16
8.4.3 Dielectric tests.16

60947-7-1 © IEC:2009 – 3 –
8.4.4 Verification of the voltage drop .16
8.4.5 Temperature-rise test .18
8.4.6 Short-time withstand current test .19
8.4.7 Ageing test (for screwless-type terminal blocks only).19
8.5 Verification of thermal characteristics .20
8.6 Verification of EMC characteristics .22
8.6.1 Immunity .22
8.6.2 Emission .22
Annex A vacant.23
Annex B (informative) Items subject to agreement between manufacturer and user .24
Annex C vacant .25
Annex D (normative) Additional requirements for test disconnect terminal blocks.26
Bibliography.34

Figure 1 − Arrangement for test according to 8.3.2 .13
Figure 2 − Arrangement for tests according to 8.4.5 and 8.4.7, and for the verification
of voltage drop.18
Figure 3 − Arrangement for test according to 8.5 .21
Figure 4 − Point of test flame contact (view from the layer placed below the terminal
block) .22
Figure D.1 – Test requirements according to D.8.4.4 for verification of the voltage drop .30

Table 1 − Standard cross-sections of round copper conductors.
Table 2 − Relationship between rated cross-section and rated connecting capacity of
terminal blocks .9
Table 3 − Attachment test parameters.14
Table 4 − Values of test current for temperature-rise test, ageing test and voltage drop
verification for metric wire sizes .17
Table 5 − Values of test current for temperature-rise test, ageing test and voltage drop
verification for AWG or kcmil wire sizes .18
Table D.1 – Operating cycles .28
Table D.2 – Values of test current for temperature-rise test, ageing test and voltage
drop verification for metric wire sizes .30
Table D.3 – Values of test current for temperature-rise test, ageing test and voltage
drop verification for AWG or kcmil wire sizes .30
Table D.4 – Short-time withstand current and corresponding wire sizes in mm .31
Table D.5 – Short-time withstand current and corresponding wire sizes in AWG .32

– 4 – 60947-7-1 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 7-1: Ancillary equipment –
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 60947-7-1 has been prepared by subcommittee 17B: Low-voltage
switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.
This third edition of IEC 60947-7-1 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:
– added in the scope that this standard may be used as a guide for special types of terminal
blocks, for example with diodes or varistors or similar component holders;
– the conventional free air thermal current added in 5.2 in the list of information to be stated
by the manufacturer;
– update of 7.1.4 that the colour combination green-yellow is not allowed for terminal blocks;
– the consequences in case of failed single tests and failed tests within test sequences
specified in 8.2;
60947-7-1 © IEC:2009 – 5 –
– requirements regarding clearances and creepage distances replaced by reference to
Annex H of IEC 60947-1, Annex A deleted;
– requirements for tightening torques for the tests improved and referenced to Table 4 of
IEC 60947-1, Annex C deleted;
– in 8.3.3.3 changed reference for pull-out force to IEC 60947-1;
– the wording of the test of the voltage drop improved in 8.4.4;
– the wording of the short-time withstand current test improved in 8.4.6;
– Annex D with additional requirements for test disconnect terminal blocks added. The
scope modified accordingly.
This standard shall be read in conjunction with IEC 60947-1. The provisions of the general
rules dealt with in IEC 60947-1 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, e.g. 1.2 of IEC 60947-1, Table 4 of IEC 60947-1 or Annex A of
IEC 60947-1.
The text of this standard is based on the following documents:
FDIS Report on voting
17B/1654/FDIS 17B/1668/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.
– 6 – 60947-7-1 © IEC:2009
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 7-1: Ancillary equipment –
Terminal blocks for copper conductors

1 General
1.1 Scope
This part of IEC 60947 specifies requirements for terminal blocks with screw-type or screw-
less-type clamping units primarily intended for industrial or similar use and to be fixed to a
support to provide electrical and mechanical connection between copper conductors. lt
applies to terminal blocks intended to connect round copper conductors, with or without
2 2
special preparation, having a cross-section between 0,2 mm and 300 mm (AWG
24/600 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.
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
This standard may be used as a guide for
− terminal blocks requiring the fixing of special devices to the conductors, for example quick
connect terminations or wrapped connections, etc.;
− terminal blocks providing direct contact to the conductors by means of edges or points
penetrating the insulation, for example insulation displacement connections, etc.;
− special types of terminal blocks, for example with diodes or varistors or similar component
holders, 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 60695-11-5:2004, Fire hazard testing – Part 11-5: Test flames – Needle-flame test
method – Apparatus, confirmatory test arrangement and guidance
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules
ISO 4046-4:2002, Paper, board, pulp and related terms − Vocabulary – Part 4: Paper and
board grades and coverted products

60947-7-1 © IEC:2009 – 7 –
2 Definitions
For the purposes of this document, the definitions given in IEC 60947-1, together with the
following definitions, apply.
2.1
terminal block
insulating part carrying one or more mutually insulated terminal assemblies and intended to
be fixed to a support
2.2
rated cross-section
value of the maximum cross-section of all connectable types of conductors, rigid (solid and
stranded) and flexible, stated by the manufacturer, and to which certain thermal, mechanical
and electrical requirements are referred
2.3
rated connecting capacity
range of cross-sections and, if applicable, the number of connectable conductors, for which
the terminal block is designed
2.4
terminal assembly
two or more clamping units fixed to the same conductive part
3 Classification
Distinction is made between various types of terminal blocks as follows:
− method of fixing the terminal block to the support;
− number of poles;
− type of clamping units: screw-type clamping units or screwless-type clamping units;
− ability to receive prepared conductors (see 2.3.27 of IEC 60947-1);
− terminal assemblies with identical or dissimilar clamping units;
− number of clamping units on each terminal assembly;
− service conditions.
4 Characteristics
4.1 Summary of characteristics
The characteristics of a terminal block are as follows:
− type of terminal block (see 4.2);
− rated and limiting values (see 4.3).
4.2 Type of terminal block
The following shall be stated:
− type of clamping units (e.g. screw-type, screwless-type);
− number of clamping units.
– 8 – 60947-7-1 © IEC:2009
4.3 Rated and limiting values
4.3.1 Rated voltages
Subclauses 4.3.1.2 and 4.3.1.3 of IEC 60947-1 apply.
4.3.2 Short-time withstand current
A specified r.m.s. value of current which a terminal block shall be able to withstand during a
specified short-time under prescribed conditions of use and behaviour (see 7.2.3 and 8.4.6).
4.3.3 Standard cross-sections
The standard values of cross-sections of round copper conductors to be used are contained in
Table 1.
Table 1 − Standard cross-sections of round copper conductors
Comparison between AWG/kcmil
and metric sizes
Metric size ISO
Size Equivalent
mm
metric area
AWG/kcmil mm
0,2 24 0,205
0,34 22 0,324
0,5 20 0,519
0,75 18 0,82
− −
1,5 16 1,3
2,5 14 2,1
4 12 3,3
6 10 5,3
10 8 8,4
16 6 13,3
25 4 21,2
35 2 33,6
50 0 53,5
70 00 67,4
95 000 85
− 0000 107,2
120 250 kcmil 127
150 300 kcmil 152
185 350 kcmil 177
240 500 kcmil 253
300 600 kcmil 304
4.3.4 Rated cross-section
The rated cross-section shall be selected from the standard cross-sections given in Table 1.

60947-7-1 © IEC:2009 – 9 –
4.3.5 Rated connecting capacity

2 2
For terminal blocks with a rated cross-section between 0,2 mm and 35 mm inclusive, the
minimum range contained in Table 2 applies. The conductors may be rigid (solid or stranded)
or flexible. The manufacturer shall state the types and the maximum and minimum cross-
sections of conductors that can be connected and, if applicable, the number of conductors
simultaneously connectable to each clamping unit. The manufacturer shall also state any
necessary preparation of the end of the conductor.
Table 2 − Relationship between rated cross-section
and rated connecting capacity of terminal blocks
Rated cross-section Rated connecting capacity
2 2
mm AWG mm AWG
0,2 24
0,2 24
0,2 – 0,34 24 – 22
0,34 22
0,2 – 0,34 – 0,5 24 – 22 – 20
0,5 20
0,34 – 0,5 – 0,75 22 – 20 – 18
0,75 18
0,5 – 0,75 – 1 –
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
6 – 10 – 16 10 – 8 – 6
16 6
10 – 16 – 25 8 – 6 – 4
25 4
16 – 25 – 35 6 – 4 – 2
35 2
5 Product information
5.1 Marking
A 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;
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 60947-7-1, if the manufacturer claims compliance with this standard;
b) the rated cross-section;
c) the rated connecting capacity, if different from Table 2, including the number of
conductors simultaneously connectable;
d) the rated insulation voltage (U );
i
e) the rated impulse withstand voltage (U ), when determined;
imp
f) service conditions, if different from those of Clause 6;

– 10 – 60947-7-1 © IEC:2009
g) conventional free air thermal current (I ).
th
NOTE The conventional free air thermal current (I ) is the maximum value of test current to be used for
th
temperature-rise tests of unenclosed equipment in free air, see 4.3.2.1 of IEC 60947-1.
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 7.1.8.1 of IEC 60947-1 applies with the following additions.
The clamping units shall allow the conductors to be connected by means ensuring that a
reliable mechanical linkage and electrical contact is properly maintained.
NOTE Screw-type clamping units are not suitable for the connection of flexible conductors with tin soldered ends.
The clamping units shall be able to withstand the forces that can be applied through the
connected conductors.
Compliance is checked by inspection and by the tests of 8.3.3.1, 8.3.3.2 and 8.3.3.3.
No contact pressure shall be transmitted through insulating materials other than ceramic, or
other material with characteristics not less suitable, unless there is sufficient resiliency in the
metallic parts to compensate for any possible shrinkage of the insulating material.
The corresponding test is under consideration.
7.1.2 Mounting
Terminal blocks shall be provided with means that allow them to be securely attached to a rail
or a mounting surface.
Tests shall be made in accordance with 8.3.2.
NOTE Information on mounting on rails can be found in IEC 60715.
7.1.3 Clearances and creepage distances
For terminal blocks for which the manufacturer has stated values of rated impulse withstand
voltage (U ) and rated insulation voltage (U ), minimum values of clearances and creepage
imp i
distances are given in Tables 13 and 15 of IEC 60947-1.
For terminal blocks for which the manufacturer has not declared a value of rated impulse
withstand voltage (U ), guidance for minimum values is given in Annex H of IEC 60947-1.
imp
Electrical requirements are given in 7.2.2.
7.1.4 Terminal identification and marking
Subclause 7.1.8.4 of IEC 60947-1 applies with the following addition.

60947-7-1 © IEC:2009 – 11 –
A terminal block shall have provision, or at least space, for identification marks or numbers for
each clamping unit or terminal assembly related to the circuit of which it forms a part.
For the identification of the terminal blocks the colour combination green-yellow is not
allowed.
NOTE Such provision may consist of separate marking items, such as marking tags, identification labels, etc.
7.1.5 Resistance to abnormal heat and fire
The insulation materials of terminal blocks shall not be adversely affected by abnormal heat
and fire.
Subclause 7.1.2.2 of IEC 60947-1 does not apply except for the Note.
Compliance is checked by the needle flame test according to IEC 60695-11-5 as specified in
8.5 of this standard.
7.1.6 Rated cross-section and rated connecting capacity
Terminal blocks shall be so designed that conductors of the rated cross-section and the rated
connecting capacity, if applicable, can be accepted.
Compliance is checked by the test described in 8.3.3.4.
The verification of the rated cross-section may be performed by the special test according to
8.3.3.5.
7.2 Performance requirements
7.2.1 Temperature rise
Terminal blocks shall be tested in accordance with 8.4.5. The temperature-rise of the
terminals shall not exceed 45 K.
7.2.2 Dielectric properties
If the manufacturer has declared a value of the rated impulse withstand voltage (U ) (see
imp
4.3.1.3 of IEC 60947-1), the requirements of 7.2.3 and 7.2.3.1 of IEC 60947-1 apply. If
applicable, the impulse withstand voltage test shall be carried out in accordance with 8.4.3 a).
For the verification of solid insulation, the requirements of 7.2.3, 7.2.3.2 and 7.2.3.5 of
IEC 60947-1 apply. The power-frequency withstand voltage test shall be carried out in
accordance with 8.4.3 b).
The verification of sufficient clearances and creepage distances shall be made in accordance
with 8.4.2.
For terminal blocks for which the manufacturer has not declared a value of rated impulse
withstand voltage (U ), guidance for minimum values is given in Annex H of IEC 60947-1.
imp
7.2.3 Short-time withstand current
A terminal block shall be capable of withstanding for 1 s the short-time withstand current
which corresponds to 120 A/mm of its rated cross-section, in accordance with 8.4.6.

– 12 – 60947-7-1 © IEC:2009
7.2.4 Voltage drop
The voltage drop on a terminal block caused by the conductor connection, measured
according to 8.4.4, shall not exceed the values specified in 8.4.4 and, where applicable, in
8.4.7.
7.2.5 Electrical performance after ageing (for screwless-type terminal blocks only)
Terminal blocks shall be capable of withstanding the ageing test comprising 192 temperature
cycles in accordance with 8.4.7.
7.3 Electromagnetic compatibility (EMC)
Subclause 7.3 of IEC 60947-1 applies.
8 Tests
8.1 Kinds of test
Subclause 8.1.1 of IEC 60947-1 applies with the following addition.
No routine tests are specified. The verification of the rated cross-section according to 8.3.3.5
is a special test. All other tests are type tests.
8.2 General
Unless otherwise specified, terminal blocks are tested in new and in clean condition, and
installed as for normal use (see 6.3 of IEC 60947-1) at an ambient temperature of (20 ± 5) °C.
NOTE ”Normal use” means that five terminal blocks are mounted on their support, the remaining open side closed
by an end plate and fixed by end brackets, if applicable.
The tests are carried out in the same order in which the subclauses describe them.
Each test is made on new separate specimens.
The tests of 8.3.3.2 and 8.3.3.3 are made on the same specimens.
The surface of the conductors shall be free of contamination and corrosion which degrades
performance.
Care shall be taken when stripping conductors to avoid cutting, nicking, scraping or otherwise
damaging the conductors.
In cases where the manufacturer has stated that special preparation of the end of the
conductor is necessary, the test report shall indicate the method of preparation used.
The tests are carried out with the type of conductor (rigid or flexible) as stated by the
manufacturer.
If one of the terminal blocks does not withstand one of the tests, this test shall be repeated on
a second set of terminal blocks, all of which shall then comply with the repeated test. If this
test is part of a test sequence, the complete test sequence shall be repeated.

60947-7-1 © IEC:2009 – 13 –
8.3 Verification of mechanical characteristics
8.3.1 General
The verification of mechanical characteristics includes the following tests:
− attachment of the terminal block on its support (see 8.3.2);
− mechanical strength of clamping units (see 8.3.3.1);
− attachment of the conductors to the clamping units (see 8.3.3.2 and 8.3.3.3);
− rated cross-section and rated connecting capacity (see 8.3.3.4 and 8.3.3.5).
8.3.2 Attachment of the terminal block on its support
The test shall be made on two clamping units at the centre terminal block out of five terminal
blocks mounted as in normal use on the appropriate support according to the manufacturer´s
instructions.
A steel pin of 150 mm length and of a diameter as specified in Table 3 is clamped
successively in each clamping unit. The tightening torque shall be in accordance with Table 4
of IEC 60947-1 or, alternatively, in accordance with the higher torque value stated by the
manufacturer. A force corresponding to the values of Table 3 is applied to the pin regularly
and without shocks at a distance of 100 mm from the centre of the clamping unit, according to
Figure 1.
During the test, no terminal block shall work free from its rail or support, nor suffer any
other damage.
1 1
100 mm 100 mm
IEC  533/09
Key
1 Force
2 Rail or support
Figure 1 − Arrangement for test according to 8.3.2

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Table 3 − Attachment test parameters
Rated cross-section of the terminal block Force Diameter of pin
mm AWG/kcmil N mm
0,2 24
0,34 22
0,5 20
0,75 18
1,0 − 1 1,0
1,5 16
2,5 14
4 12
6 10
10 8 5 2,8
16 6
25 4
35 2 10 5,7
50 0
70 00
95 000
−
120 250 kcmil 15 12,8
150 300 kcmil
185 350 kcmil
240 500 kcmil
20 20,5
300 600 kcmil
8.3.3 Mechanical properties of clamping units
8.3.3.1 Test of mechanical strength of clamping units
Subclauses 8.2.4.1 and 8.2.4.2 of IEC 60947-1 apply with the following addition.
The test shall be made on two clamping units at the centre terminal block out of five terminal
blocks mounted as in normal use on the appropriate support according to the manufacturer's
instructions.
After verification of the voltage drop according to 8.4.4 with a connected rigid conductor of the
rated cross-section stated by the manufacturer and subsequently, if applicable, with a
connected flexible conductor of the minimum cross-section stated by the manufacturer, rigid
conductors of the rated cross-section shall be connected and disconnected five times each.
At the end of the test, the terminal blocks shall pass the voltage drop test according to 8.4.4
with a connected rigid conductor of the rated cross-section and subsequently, if applicable,
with a connected flexible conductor of the minimum cross-section.
8.3.3.2 Testing for damage to and accidental loosening of conductors
of a terminal block (flexion test)
Subclauses 8.2.4.1 and 8.2.4.3 of IEC 60947-1 apply with the following modification.
Each test shall be carried out on two clamping units of one terminal block.

60947-7-1 © IEC:2009 – 15 –
The tightening torque shall be in accordance with Table 4 of IEC 60947-1 or alternatively in
accordance with the higher torque value stated by the manufacturer.
The tests shall be made with the type (rigid and/or flexible) and the number of conductors
stated by the manufacturer as follows:
− with the different types of conductor of the specified smallest cross-section (only one
conductor connected);
− with the different types of conductor of the specified rated cross-section (only one
conductor connected);
and, if applicable,
– with the type(s) of conductor of the largest connectable cross-section, if larger than the
rated cross-section (only one conductor connected);
− with the different types and maximum number of conductors of the smallest cross-section
simultaneously connectable;
− with the different types and maximum number of conductors of the largest cross-section
simultaneously connectable;
− with the different types and maximum number of conductors of the smallest and largest
cross-section simultaneously connectable.
8.3.3.3 Pull-out test
Subclause 8.2.4.4 of IEC 60947-1.
8.3.3.4 Verification of rated cross-section and rated connecting capacity
The test shall be carried out on each clamping unit of one terminal block.
For conductors of the rated cross-section and for terminal blocks with a rated connecting
, one conductor of the two next smaller cross-sections shall be inserted
capacity up to 35 mm
unhindered in the opened clamping unit and be connected.
Theoretical diameter of the largest conductor is given in Table 7a of IEC 60947-1.
8.3.3.5 Verification of rated cross-section (special test with gauges)
Subclause 8.2.4.5 of IEC 60947-1 applies with the following addition.
The test shall be carried out on each clamping unit of one terminal block.
8.4 Verification of electrical characteristics
8.4.1 General
The verification of electrical characteristics includes the following:
− verification of clearances and creepage distances (see 8.4.2);
− dielectric test (see 8.4.3);
− verification of the voltage drop (see 8.4.4);
− temperature-rise test (see 8.4.5);
− short-time withstand current test (see 8.4.6);
− ageing test for screwless-type terminal blocks only (see 8.4.7).

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8.4.2 Verification of clearances and creepage distances
8.4.2.1 General
The verification is made between two adjacent terminal blocks and between a terminal block
and the metal support to which the terminal blocks are attached.
The measurement of clearances and creepage distances shall be made under the following
conditions:
a) the terminal blocks shall be wired with the most unfavourable conductor type(s) and
conductor cross-section(s) among those declared by the manufacturer;
b) the conductor ends shall be stripped to a length specified by the manufacturer;
c) in case the manufacturer has stated the possibility of using different metal supports, the
most unfavourable support shall be used.
The method of measuring clearances and creepage distances is given in Annex G of
IEC 60947-1.
8.4.2.2 Clearances
The measured values of clearances shall be higher than the values given in Table 13 of
IEC 60947-1 for case B − homogeneous field (see 7.2.3.3 of IEC 60947-1) depending on the
value of the rated impulse withstand voltage (U ) and the pollution degree stated by the
imp
manufacturer.
The impulse withstand voltage test shall be carried out in accordance with 8.4.3 a) unless the
measured clearances are equal to or larger than the values given in Table 13 of IEC 60947-1
for case A − inhomogeneous field (see 8.3.3.4.1, item 2), of IEC 60947-1)
...