SIST EN IEC 60331-1:2019

SLOVENSKI STANDARD
01-november-2019
Nadomešča:
SIST EN 50362:2004
Preskusi požarne odpornosti električnih kablov - Celovitost tokokroga - 1. del:
Metoda preskušanja požarne odpornosti s temperaturnim udarom vsaj 830 °C za
kable z naznačeno napetostjo do vključno 0,6/1,0 kV in zunanjim premerom,
večjim od 20 mm (IEC 60331-1:2018)
Tests for electric cables under fire conditions - Circuit integrity - Part 1: Test method for
fire with shock at a temperature of at least 830°C for cables of rated voltage up to and
including 0,6/1,0 kV and with an overall diameter exceeding 20 mm (IEC 60331-1:2018)
Prüfungen an Kabeln und isolierten Leitungen im Brandfall - Isolationserhalt - Teil 1:
Prüfverfahren für Brand mit Erschütterung bei einer Temperatur von mindestens 830 °C
für Kabel und isolierte Leitungen mit einer Nennspannung bis einschließlich 0,6/1,0 kV
und einem Außendurchmesser größer 20 mm (IEC 60331-1:2018)
Essais pour câbles électriques soumis au feu - Intégrité des circuits - Partie 1: Méthode
d’essai au feu avec chocs pour les câbles de tension assignée au plus égale à 0,6/1,0
kV et de diamètre externe supérieur à 20 mm, à une température d’au moins 830 °C
(IEC 60331-1:2018)
Ta slovenski standard je istoveten z: EN IEC 60331-1:2019
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.060.20 Kabli Cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60331-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 13.220.40; 29.020; 29.060.20 Supersedes EN 50362:2003 and all of its amendments
and corrigenda (if any)
English Version
Tests for electric cables under fire conditions - Circuit integrity -
Part 1: Test method for fire with shock at a temperature of at
least 830°C for cables of rated voltage up to and including
0,6/1,0 kV and with an overall diameter exceeding 20 mm
(IEC 60331-1:2018)
Essais pour câbles électriques soumis au feu - Intégrité des Prüfungen an Kabeln und isolierten Leitungen im Brandfall -
circuits - Partie 1: Méthode d'essai au feu avec chocs pour Isolationserhalt - Teil 1: Prüfverfahren für Brand mit
les câbles de tension assignée au plus égale à 0,6/1,0 kV et Erschütterung bei einer Temperatur von mindestens 830 °C
de diamètre externe supérieur à 20 mm, à une température für Kabel und isolierte Leitungen mit einer Nennspannung
d'au moins 830 °C bis einschließlich 0,6/1,0 kV und einem Außendurchmesser
(IEC 60331-1:2018) größer 20 mm
(IEC 60331-1:2018)
This European Standard was approved by CENELEC on 2019-07-19. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60331-1:2019 E

European foreword
This document (EN IEC 60331-1:2019) consists of the text of document IEC 60331-1:2018, prepared
by IEC/TC 20 "Electric cables"
The following dates are fixed:
• latest date by which this document has to be (dop) 2020-07-19
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2022-07-19
conflicting with this document have to be withdrawn
This document supersedes EN 50362:2003 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60331-1:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61034-1 NOTE  Harmonized as EN 61034-1 (not modified).

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60269-3 -  Low-voltage fuses - Part 3: Supplementary HD 60269-3 -
requirements for fuses for use by unskilled
persons (fuses mainly for household or
similar applications) - Examples of
standardized systems of fuses A to F
IEC 60584-1 -  Thermocouples - Part 1: EMF EN 60584-1 -
specifications and tolerances
IEC 60331-1 ®
Edition 2.0 2018-03
INTERNATIONAL
STANDARD
GROUP SAFETY PUBLICATION
Tests for electric cables under fire conditions – Circuit integrity –

Part 1: Test method for fire with shock at a temperature of at least 830 °C for

cables of rated voltage up to and including 0,6/1,0 kV and with an overall

diameter exceeding 20 mm
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.40; 29.020; 29.060.20 ISBN 978-2-8322-5489-9

– 2 – IEC 60331-1:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Test environment . 8
5 Test apparatus . 8
5.1 Test equipment . 8
5.2 Test ladder and mounting . 12
5.3 Source of heat . 13
5.3.1 Burner . 13
5.3.2 Flow meters and flow rates . 14
5.3.3 Verification . 15
5.4 Shock producing device . 15
5.5 Positioning of source of heat . 16
5.6 Continuity checking arrangements for electric power and control cables with
rated voltage up to and including 600 V/1 000 V . 16
5.7 Fuses. 16
6 Test specimen (electric power and control cables with rated voltage up to and
including 600 V/1 000 V) . 16
6.1 Test specimen preparation . 16
6.2 Test specimen mounting . 17
6.2.1 Single core cables with concentric metal layer and multicore cables . 17
6.2.2 Single core cables without concentric metal layer . 19
7 Test procedure (electric power and control cables with rated voltage up to and
including 600 V/1 000 V) . 20
7.1 Test equipment and arrangement . 20
7.2 Electrical connections . 20
7.3 Flame and shock application . 22
7.4 Electrification . 22
8 Performance requirements (electric power and control cables with rated voltage
up to and including 600/1 000 V) . 23
8.1 Flame application time . 23
8.2 Acceptance criteria . 23
9 Retest procedure . 23
10 Test report (electric power and control cables with rated voltage up to and
including 600 V/1 000 V) . 23
11 Cable marking . 23
Annex A (normative) Verification procedure for the source of heat . 24
A.1 Measuring equipment . 24
A.2 Procedure . 24
A.3 Evaluation . 25
A.4 Further verification . 25
A.5 Verification report . 25
Annex B (informative) Guidance on the choice of recommended test apparatus (burner
and venturi) . 26

IEC 60331-1:2018 © IEC 2018 – 3 –
Bibliography . 27

Figure 1 – Schematic diagram of test configuration . 10
Figure 2 – Plan view of fire test equipment . 11
Figure 3 – End elevation of fire test equipment (not to scale) . 12
Figure 4 – Typical rubber bush for supporting the test ladder . 13
Figure 5 – Burner face . 14
Figure 6 – Schematic diagram of an example of a burner control system . 15
Figure 7 – Example of method of mounting a larger diameter test specimen for test
(with a bending radius between approximately 200 and 400 mm) . 17
Figure 8 – Detailed section of adjustable position of vertical ladder elements for
mounting a smaller diameter test specimen for test (with a maximum bending radius of
approximately 200 mm) . 18
Figure 9 – Example of method of mounting test specimen with a bending radius in
normal use larger than approximately 400 mm . 19
Figure 10 – Method of mounting test specimen of a single core cable without
concentric metal layer . 20
Figure 11 – Basic circuit diagram – Electric power and control cables with rated
voltage up to and including 600 V/1 000 V . 22
Figure A.1 – Temperature measuring arrangement . 24

– 4 – IEC 60331-1:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS FOR ELECTRIC CABLES UNDER FIRE CONDITIONS –
CIRCUIT INTEGRITY –
Part 1: Test method for fire with shock at a temperature of at least
830 °C for cables of rated voltage up to and including 0,6/1,0 kV
and with an overall diameter exceeding 20 mm

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 60331-1 has been prepared by IEC technical committee 20:
Electric cables.
This second edition cancels and replaces the first edition published in 2009. It constitutes a
technical revision.
The significant technical changes with respect to the previous edition are as follows:
– extension of the scope to include metallic data and telecom cables and optical fibre
cables, although details for the specific point of failure, continuity checking arrangement,
test sample, test procedure and test report relevant to metallic data and telecom cables
and optical fibre cables are not given by IEC 60331-1;
– improved description of the test environment;

IEC 60331-1:2018 © IEC 2018 – 5 –
– modified steel test ladder with two extra vertical elements to accommodate the modified
testing of single core cables without concentric metal layer and the testing of cables with a
bending radius in normal use larger than approximately 400 mm;
– mandatory use of mass flow meters/controllers as the means of controlling accurately the
input flow rates of fuel and air to the burner;
– improved description of the information to be included in the test report.
The text of this International Standard is based on the following documents:
FDIS Report on voting
20/1781A/FDIS 20/1792/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
It has the status of a group safety publication in accordance with IEC Guide 104.
A list of all parts of the IEC 60331 series, published under the title: Tests for electric cables
under fire conditions – Circuit integrity, 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.
A bilingual version of this publication may be issued at a later date.

– 6 – IEC 60331-1:2018 © IEC 2018
INTRODUCTION
IEC 60331 consists of the following parts under the general title: Tests for electric cables
under fire conditions – Circuit integrity:
Part 1: Test method for fire with shock at a temperature of at least 830 °C for cables of rated
voltage up to and including 0,6/1,0 kV and with an overall diameter exceeding 20 mm
Part 2: Test method for fire with shock at a temperature of at least 830 °C for cables of rated
voltage up to and including 0,6/1,0 kV and with an overall diameter not exceeding 20 mm
Part 3: Test method for fire with shock at a temperature of at least 830 °C for cables of rated
voltage up to and including 0,6/1,0 kV tested in a metal enclosure
Part 11: Apparatus – Fire alone at a flame temperature of at least 750 °C
Part 21: Procedures and requirements – Cables of rated voltage up to and including 0,6/1,0 kV
Part 23: Procedures and requirements – Electric data cables
Part 25: Procedures and requirements – Optical fibre cables
NOTE 1 Parts 21, 23 and 25 relate to fire-only conditions at a flame temperature of at least 750 °C.
NOTE 2 Parts 11, 21, 23 and 25 are no longer subject to maintenance. IEC 60331 Parts 1 and 2 are the
recommended test procedures
Since its first edition (1970), IEC 60331 has been extended and has introduced a range of test
apparatus in order that a test may be carried out on large and small power, control, data and
optical fibre cables.
Successful tests carried out in accordance with this standard will enable an identification to be
marked on the product.
IEC 60331-1:2018 © IEC 2018 – 7 –
TESTS FOR ELECTRIC CABLES UNDER FIRE CONDITIONS –
CIRCUIT INTEGRITY –
Part 1: Test method for fire with shock at a temperature of at least
830 °C for cables of rated voltage up to and including 0,6/1,0 kV
and with an overall diameter exceeding 20 mm

1 Scope
This part of IEC 60331 specifies the test method for cables which are required to maintain
circuit integrity when subject to fire and mechanical shock under specified conditions.
This document is applicable to cables of rated voltage not exceeding 600 V/1 000 V, including
those of rated voltage below 80 V, metallic data and telecom cables and optical fibre cables.
It is intended for use when testing cables of greater than 20 mm overall diameter.
Cables of smaller diameter are intended to be tested using the apparatus, procedure and
requirements of IEC 60331-2.
This document includes details for the specific point of failure, continuity checking
arrangement, test sample, test procedure and test report relevant to electric power and
control cables with rated voltage up to and including 600 V/1 000 V. Details for the specific
point of failure, continuity checking arrangement, test sample, test procedure and test report
relevant to metallic data and telecom cables and optical fibre cables are not given by
IEC 60331-1.
Although the scope is restricted to cables with rated voltage up to and including 0,6/1,0 kV,
the procedure can be used, with the agreement of the manufacturer and the purchaser, for
cables with rated voltage up to and including 1,8/3 (3,3) kV, provided that suitable fuses are
used.
Annex A provides the method of verification of the burner and control system used for the
test.
Requirements are stated for an identification that may optionally be marked on the cable to
signify compliance with this document.
CAUTION – The test given in this standard may involve the use of dangerous voltages
and temperatures. Suitable precautions should be taken against the risk of shock,
burning, fire and explosion that may be involved, and against any noxious fumes that
may be produced.
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 60584-1, Thermocouples – Part 1: EMF specifications and tolerances

– 8 – IEC 60331-1:2018 © IEC 2018
IEC 60269-3, Low-voltage fuses – Part 3: Supplementary requirements for fuses for use by
unskilled persons (fuses mainly for household and similar applications) – Examples of
standardized systems of fuses A to F
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
circuit integrity
ability of an electric cable to continue to operate in a designated manner whilst subjected to a
specified flame source for a specified period of time under specified conditions
3.2
draught-free environment
space in which the results of tests are not significantly affected by the local air speed
4 Test environment
The test shall be carried out in a draught-free environment within a suitable chamber, of
minimum volume 20 m , with facilities for disposing of any noxious gases resulting from the
burning. Sufficient ventilation shall be available to sustain the flame for the duration of the
test. Air inlets and the exhaust chimney should be located in such a way that the burner flame
remains stable during the verification procedure and test. If necessary, the burner shall be
shielded from any draughts by the use of draught shields. Windows may be installed in the
walls of the chamber i
...