prEN IEC 60947-7-2:2026

SLOVENSKI STANDARD
01-februar-2026
Nizkonapetostne stikalne in krmilne naprave - 7-2. del: Pomožna oprema -
Priključni bloki zaščitnih vodnikov za bakrene vodnike
Low-voltage switchgear and controlgear - Part 7-2: Ancillary equipment - Protective
conductor terminal blocks for copper conductors
Niederspannungsschaltgeräte - Teil 7-2: Hilfseinrichtungen - Schutzleiter-
Reihenklemmen für Kupferleiter
Appareillage à basse tension - Partie 7-2: Matériels accessoires - Blocs de jonction de
conducteur de protection pour conducteurs en cuivre
Ta slovenski standard je istoveten z: prEN IEC 60947-7-2:2026
ICS:
29.120.99 Druga električna dodatna Other electrical accessories
oprema
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.

121A/707/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60947-7-2 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-02 2026-03-27
SUPERSEDES DOCUMENTS:
121A/682/CD, 121A/698A/CC
SC 121A : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
IEC
SECRETARIAT: SECRETARY:
France Mr Alban NOTIN
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

TC 121, SC 121B
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
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Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Low-voltage switchgear and controlgear – Part 7-2: Ancillary equipment – Protective conductor terminal blocks
for copper conductors
PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
SC121A officers are supporting the circulation of the CDV of IEC 60947-7-2 ED4
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
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IEC 60947-7-2 ED4 © IEC 2026
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i
IEC 60947-7-2 ED4 © IEC 2026
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Definitions . 6
4 Classification . 6
5 Characteristics . 7
5.1 Summary of characteristics . 7
5.2 Type of protective conductor terminal block . 7
5.3 Rated and limiting values . 7
5.3.1 Void . 7
5.3.2 Short-time withstand current . 7
5.3.3 Standard cross-sections . 7
5.3.4 Rated cross-section . 7
5.3.5 Rated connecting capacity . 7
6 Product information . 7
6.1 Marking . 7
6.1.1 Manufacturer or trade mark . 7
6.1.2 Type-reference . 7
6.2 Additional information . 8
7 Normal service, mounting and transport conditions . 8
8 Constructional and performance requirements . 8
8.1 Constructional requirements . 8
8.1.1 Clamping units . 8
8.1.2 Connection to support . 9
8.1.3 Clearance and creepage distances . 9
8.1.4 Terminal block identification and marking . 9
8.1.5 Resistance to abnormal heat and fire . 9
8.1.6 Rated cross-section and rated connecting capacity. 9
8.1.7 Protective conductor mounting rails . 9
8.2 Performance requirements . 10
8.2.1 Temperature-rise . 10
8.2.2 Dielectric properties . 10
8.2.3 Short-time withstand current . 10
8.2.4 Voltage drop . 10
8.2.5 Electrical performance after ageing (for screwless-type protective
conductor terminal blocks only) . 10
8.2.6 Contact pressure via insulating material (CoPI) . 10
8.3 Electromagnetic compatibility (EMC) . 10
9 Tests . 11
9.1 Kinds of test . 11
9.2 General . 11
9.3 Verification of mechanical characteristics . 11
9.3.1 General . 11
9.3.2 Attachment of the protective conductor terminal block on its support . 11
9.3.3 Mechanical properties of clamping units . 11
9.4 Verification of electrical characteristics . 12
IEC 60947-7-2 ED4 © IEC 2026
9.4.1 General . 12
9.4.2 Void . 12
9.4.3 Dielectric tests . 12
9.4.4 Verification of the voltage drop . 13
9.4.5 Temperature-rise test . 14
9.4.6 Short-time withstand current test . 17
9.4.7 Ageing test (for screwless-type terminal blocks only) . 18
9.4.8 Contact pressure via insulating material (CoPI) test . 20
9.5 Verification of thermal characteristics . 20
9.6 Verification of EMC characteristics . 20
Annex A (normative) Maximum short-time withstand currents allocated to the rail
profile and thermal rated current of a PEN busbar . 21
Annex B (informative) Main properties for protective conductor terminal blocks for
copper conductors . 22
B.1 General . 22
B.2 Properties of protective conductor terminal blocks . 22
Bibliography . 23

Figure 1 – Arrangement for the dielectric test . 13
Figure 2 – Arrangement for the voltage drop test . 14
Figure 3 – Arrangement for the temperature-rise test for test group a) . 16
Figure 4 – Arrangement for the temperature-rise test for test group b) . 17
Figure 5 – Arrangement for the thermal short-time withstand current test . 18

Table 1 – . Error! Bookmark not defined.
Table A.1 – Maximum short-time withstand currents allocated to the rail profile and
thermal rated current of a PEN busbar . 21

IEC 60947-7-2 ED4 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Low-voltage switchgear and controlgear –
Part 7-2: Ancillary equipment –
Protective conductor terminal blocks for copper conductors

FOREWORD
a) 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.
b) 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.
c) 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.
d) 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.
e) 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.
f) All users should ensure that they have the latest edition of this publication.
g) 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.
h) 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.
i) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s),
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
https://patents.iec.ch. 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 121A: Low-voltage
switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear.
This fourth edition of IEC 60947-7-2 cancels and replaces the third edition, published in 2009,
and constitutes a technical revision.
The main technical modifications of this standard since this previous publication are listed
below:
– Scope extension for larger conductor cross-sections;
– Implementation of a contact pressure via insulation material (CoPI) test;
– .
IEC 60947-7-2 ED4 © IEC 2026
This standard shall be read in conjunction with IEC 60947-1:2020 and IEC 60947-7-1:2025. The
provisions of the general rules dealt with in IEC 60947-1:2020 and the requirements for terminal
blocks of IEC 60947-7-1:2025 are applicable to this standard, where specifically called for.
Clauses and subclauses, tables, figures and annexes thus applicable are identified by reference
to IEC 60947-1:2020 or IEC 60947-7-1:2025, e.g. 1.2 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
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 60947-1:2020, 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.
IEC 60947-7-2 ED4 © IEC 2026
1 Scope
This part of IEC 60947 specifies requirements for protective conductor terminal blocks (PE and
PEN conductors) with screw-type or screwless-type clamping units, primarily intended for
industrial applications or similar use in circuits of a rated voltage not exceeding 1 000 V AC up
to 1 000 Hz or 1 500 V DC, most commonly in conjunction with terminal blocks according to IEC
60947-7-1:2025.
This document applies to:
- protective conductor terminal blocks with PE function having a cross-section between 0,05
mm²/30 AWG and 150 mm²/300 kcmil and
- protective conductor terminal blocks with PEN function having a cross-section between 10
mm²/ 8 AWG and 150 mm²/300 kcmil.
Protective conductor terminal blocks are intended to form the electrical and mechanical
connection between round copper conductors with or without special preparation and the fixing
support.
NOTE 1 AWG is the abbreviation of “American Wire Gage” [Gage (US) = Gauge (UK)]
kcmil = 1 000 cmil
1 cmil = 1 circular mil = surface area of a circle having a diameter of 1 mil
1 mil = 1/1 000 inch
NOTE 2 This standard can be used as a part of additional risk assessment for following product which are not
covered by the scope of this standard:”
- 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 60947-1:2020.
Where applicable in this standard, the term “protective conductor terminal blocks” replaces the
term "terminal block" when referring to IEC 60947-7-1:2025
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 60068-2-1:2007, Environmental testing - Part 2-1: Tests - Test A: Cold
IEC 60068-2-2:2007, Environmental testing - Part 2-2: Tests - Test B: Dry heat
IEC 60947-1:2020, Low-voltage switchgear and controlgear - Part 1: General rules
IEC 60947-7-1:2025, Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment -
Terminal blocks for copper conductors
IEC 61439-1:2020, Low-voltage switchgear and controlgear assemblies - Part 1: General rules
IEC 60947-7-2 ED4 © IEC 2026
IEC 62683-1:2017, Low-voltage switchgear and controlgear - Product data and properties for
information exchange - Part 1: Catalogue data
IEC TS 63058:2021, Switchgear and controlgear and their assemblies for low voltage -
Environmental aspects
Low-voltage switchgear and controlgear - Part 7-2: Ancillary equipment - Protective conductor
terminal blocks for copper conductors
Low-voltage switchgear and controlgear - Part 7-2: Ancillary equipment - Protective conductor
terminal blocks for copper conductors
3 Definitions
For the purposes of this document, definitions given in IEC 60947-7-1:2025 together with the
following definitions, apply.
3.1
protective conductor terminal block
device with one or more clamping units for connecting and/or joining protective earth 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 to entry: Supports are, for example, mounting rails, sheet metal cut-outs, mounting plates, etc.
Note 2 to entry: A protective conductor terminal block can be either partially insulated or not at all. lt does not
require any functional insulation.
3.2
partially insulated protective conductor terminal block
device which is only insulated against live parts of other devices but not against the support
itself
3.3
PEN conductor
earthed conductor combining the functions of both protective conductor and neutral conductor
Note 1 to entry: The acronym PEN results from the combination of both symbols PE for the protective conductor
and N for the neutral conductor (see 3.3.29 of IEC 60947-1:2020).
3.4
connection to conductor [CC]
wire conducting connection of protective conductor terminal blocks
3.5
connection to support [CS]
conducting connection to support of protective conductor terminal blocks

Note 1 to entry: Supports are, for example, mounting rails, sheet metal cut-outs, mounting plates, etc
4 Classification
Distinction is made between various types of protective conductor terminal blocks as follows:
– method of fixing the protective conductor terminal block (3.1) 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);
IEC 60947-7-2 ED4 © IEC 2026
– terminal assemblies with identical or dissimilar clamping units;
– number of clamping units on each terminal assembly;
– service conditions;
– PE or PEN functions.
5 Characteristics
5.1 Summary of characteristics
Subclause 5.1 of IEC 60947-7-1:2025 applies.
5.2 Type of protective conductor terminal block
Subclause 5.2 of IEC 60947-7-1:2025 applies.
5.3 Rated and limiting values
5.3.1 Void
5.3.2 Short-time withstand current
Subclause 5.3.2 of IEC 60947-7-1:2025 applies.
5.3.3 Standard cross-sections
Subclause 5.3.3 of IEC 60947-7-1:2025 applies with the following addition.
In accordance with the scope of this standard, Table 1 of IEC 60947-7-1:2025 applies only up
to 150 mm /300 kcmil.
5.3.4 Rated cross-section
Subclause 5.3.4 of IEC 60947-7-1:2025 applies.
5.3.5 Rated connecting capacity
Subclause 5.3.5 of IEC 60947-7-1:2025 applies with the modification for one conductor per
clamping unit only.
NOTE As an example of one conductor per clamping unit only, refer to the last sentence of subclause 8.8 paragraph
12 of IEC 61439-1:2020.
6 Product information
6.1 Marking
6.1.1 Manufacturer or trade mark
All protective conductor terminal blocks shall be marked in a durable and legible manner with
the name of the manufacturer or a trade mark, by which the manufacturer can be readily
identified.
6.1.2 Type-reference
The type-reference permitting the identification of protective conductor terminal blocks shall be
provided in order to obtain relevant information from the manufacturer or his product
documentation (e.g. machine-readable code with reference to internet, electronic catalogues,
web-link on the package unit or product inserts, etc.). The type-reference shall be marked on
IEC 60947-7-2 ED4 © IEC 2026
the protective conductor terminal block (3.1) or, if the dimensions of the protective conductor
terminal block (3.1) do not permit durable and legible marking, on the smallest package unit or
product inserts.
6.2 Additional information
The following information shall be stated by the manufacturer in the product documentation
(e.g. machine-readable code with reference to internet, electronic catalogues, web-link on the
package unit or product inserts, etc.):
a) the rated cross-section;
b) the rated connecting capacity, if wider than in Table 1 of IEC 60947-7-1:2025;
c) service conditions, if different from those of Clause 7;
d) following information for non-universal terminal blocks, depending on the classification, shall
be used:
– for clamping units declared for solid conductors “solid” or the abbreviations “s” or “sol”
– for clamping units declared for rigid stranded conductors “rigid stranded” or the
abbreviation “r”;
– for clamping units declared for flexible conductors “flexible” or the abbreviation “f”;
e) special preparation of the end of the conductor, if applicable;
f) for screw type protective conductor terminal blocks the manufacturer`s declared tightening
torque, either from Table 4 of IEC 60947-1:2020 or higher, if applicable;
g) installation instructions;
h) safety instructions;
i) for
...