SIST EN 60947-7-1:2009

Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors (IEC 60947-7-1:2009)

This part of IEC 60947 specifies requirements for terminal blocks with screw-type or screwless- 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 special preparation, having a cross-section between 0,2 mm2 and 300 mm2 (AWG 24/600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1000 V a.c. up to 1000 Hz or 1 500 V d.c.

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)

La CEI 60947-7-1:2009 spécifie les exigences pour les blocs de jonction avec des organes de serrage du type à vis ou du type sans vis destinés principalement à des usages industriels ou similaires et à être fixés sur un support afin d'assurer une connexion électrique et mécanique entre des conducteurs en cuivre. Elle s'applique aux blocs de jonction destinés à raccorder des conducteurs ronds en cuivre, avec ou sans préparation spéciale, de section comprise entre 0,2 mm² et 300 mm² (AWG 24/600 kcmil), destinés à être insérés dans des circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif jusqu'à 1 000 Hz ou 1 500 V en courant continu. La présente norme peut servir de guide pour  - les blocs de jonction nécessitant la fixation de pièces spéciales sur les conducteurs, par exemple les connexions rapides ou les connexions enroulées, etc.;  - les blocs de jonction assurant un contact direct avec les conducteurs au moyen de lames ou de pointes pénétrant à travers l'enveloppe isolante, par exemple les connexions par déplacement d'isolant, etc.;  - les types particuliers de blocs de jonction, par exemple comportant des diodes ou des varistances ou des porteurs d'éléments similaires, etc.  Dans la présente norme, le terme 'organe de serrage' a été utilisé, s'il y a lieu, à la place du terme 'borne'. Cela est pris en compte en cas de référence à la CEI 60947-1.  Les modifications techniques majeures de la présente norme depuis la précédente publication sont listées ci-dessous:  - l'ajout dans le domaine d'application que la présente norme peut être utilisée comme un guide pour des types particuliers de blocs de jonction, par exemple comportant des diodes ou des varistances ou des porteurs d'éléments similaires;  - le courant thermique conventionnel à l'air libre ajouté en 5.2 dans la liste des informations à établir par le constructeur;  - la mise à jour de 7.1.4 spécifiant que la combinaison de couleur vert-jaune n'est pas admise pour les blocs de jonction;  - les conséquences en cas d'essais séparés ayant failli et en cas d'essais ayant failli au cours des séquences d'essai spécifiées en 8.2;  - les exigences concernant les distances d'isolement et les lignes de fuite remplacées par la référence à l'Annexe H de la CEI 60947-1 et la suppression de l'Annexe A;  - les exigences concernant les couples de serrage pour les essais améliorées et référencées au Tableau 4 de la CEI 60947-1 et la suppression de l'Annexe C;  - en 8.3.3.3 la référence concernant la force de traction pour la CEI 60947-1 a été modifiée;  - en 8.4.4 la rédaction de l'essai de chute de tension a été améliorée;  - en 8.4.6 la rédaction de l'essai du courant assigné de courte durée admissible a été améliorée;  - ajout de l'Annexe D avec des exigences supplémentaires pour les blocs de jonction de déconnexion d'essai. Le domaine d'application a été modifié en conséquence.   Cette publication doit être lue conjointement avec la CEI 60947-1:2007.

Nizkonapetostne stikalne in krmilne naprave - 7-1. del: Pomožna oprema - Priključni bloki za bakrene vodnike (IEC 60947-7-1:2009)

General Information

• Status: Published
• Publication Date: 16-Aug-2009
• ICS: 29.120.99 - Other electrical accessories
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 07-Jul-2009
• Due Date: 11-Sep-2009
• Completion Date: 17-Aug-2009
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Ref Project: EN 60947-7-1:2009 - Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors

Relations

• Official Journal Project Relation: SIST EN 60947-7-1:2003 - Low-voltage switchgear and controlgear -- Part 7-1: Ancillary equipment - Terminal blocks for copper conductors
• Effective Date: 06-Apr-2010
• Replaces: SIST EN 60947-7-1:2003 - Low-voltage switchgear and controlgear -- Part 7-1: Ancillary equipment - Terminal blocks for copper conductors
• Effective Date: 28-Jan-2023
• Replaces: SIST EN 60947-7-1:2003 - Low-voltage switchgear and controlgear -- Part 7-1: Ancillary equipment - Terminal blocks for copper conductors
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60947-7-1:2009
01-september-2009
1DGRPHãþD
SIST EN 60947-7-1:2003
1L]NRQDSHWRVWQHVWLNDOQHLQNUPLOQHQDSUDYHGHO3RPRåQDRSUHPD
3ULNOMXþQLEORNL]DEDNUHQHYRGQLNH,(&
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
SIST EN 60947-7-1:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 60947-7-1:2009

---------------------- Page: 2 ----------------------

SIST EN 60947-7-1:2009

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

---------------------- Page: 3 ----------------------

SIST EN 60947-7-1:2009
EN 60947-7-1:2009 – 2 –
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.
__________

---------------------- Page: 4 ----------------------

SIST EN 60947-7-1:2009
– 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).
__________

---------------------- Page: 5 ----------------------

SIST EN 60947-7-1:2009
EN 60947-7-1:2009 – 4 –

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

---------------------- Page: 6 ----------------------

SIST EN 60947-7-1:2009
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
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST EN 60947-7-1:2009
– 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

---------------------- Page: 8 ----------------------

SIST EN 60947-7-1:2009
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

8
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
2
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

---------------------- Page: 9 ----------------------

SIST EN 60947-7-1:2009
– 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;

---------------------- Page: 10 ----------------------

SIST EN 60947-7-1:2009
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.

---------------------- Page: 11 ----------------------

SIST EN 60947-7-1:2009
– 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

---------------------- Page: 12 ----------------------

SIST EN 60947-7-1:2009
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.

---------------------- Page: 13 ----------------------

SIST EN 60947-7-1:2009
– 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
2
Size Equivalent
mm
metric area
2
AWG/kcmil mm
0,2 24 0,205
0,34 22 0,324
0,5 20 0,519
0,75 18 0,82
1
− −
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.

---------------------- Page: 14 ----------------------

SIST EN 60947-7-1:2009
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
...