Tests for electric cables under fire conditions - Circuit integrity - 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

IEC 60331-3:2018 is available as IEC 60331-3:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60331-3:2018 specifies the test method for cables which are required to maintain circuit integrity when tested in a metal enclosure and 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 not greater than 20 mm overall diameter. 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 60331-3. 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. It is not assumed that cables successfully assessed by this method, will also pass requirements for either IEC 60331-1 or IEC 60331-2. Testing to either of these two standards is to be carried out separately. Such additional performance can be recognised by the marking in accordance with IEC 60331-1:2018 Clause 11 or IEC 60331 2:2018 Clause 11. 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 60331-3;
– improved description of the test environment;
– mandatory use of mass flow meter/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.

Essais pour câbles électriques soumis au feu – Intégrité des circuits – Partie 3: Méthode d’essai au feu pour les câbles de tension assignée au plus égale à 0,6/1,0 kV, soumis à essai sous conduit métallique avec chocs, à une température d’au moins 830 °C

L'IEC 60331-3:2018 spécifie la méthode d'essai pour les câbles nécessaires afin de conserver l'intégrité du circuit quand ils sont soumis à l'essai sous conduit métallique et exposés à un feu et à des chocs mécaniques dans des conditions spécifiées.
La présente norme s'applique aux câbles de tension assignée au plus égale à 600 V/1000 V, y compris ceux dont la tension assignée est inférieure à 80 V, aux câbles métalliques de données et de télécommunications ainsi qu'aux câbles à fibres optiques.
Elle est destinée à être utilisée pour soumettre à l'essai des câbles de diamètre externe inférieur ou égal à 20 mm.
La présente norme inclut des informations concernant le point spécifique de défaillance, le dispositif de contrôle de la continuité, l'échantillon d'essai, la procédure d'essai et le rapport d'essai pertinents pour les câbles électriques de puissance et de commande de tension assignée au plus égale à 600 V/1000 V. Les informations concernant le point spécifique de défaillance, le dispositif de contrôle de la continuité, l'échantillon d'essai, la procédure d'essai et le rapport d'essai pertinents pour les câbles métalliques de données et de télécommunications et les câbles à fibres optiques ne sont pas données dans l'IEC 60331-3.
Bien que le domaine d'application soit limité aux câbles de tension assignée au plus égale à 0,6/1,0 kV, cette procédure peut être utilisée, après accord entre le fabricant et l'acheteur, pour les câbles de tension assignée au plus égale à 1,8/3 (3,3) kV, à condition d'utiliser des fusibles appropriés.
Rien ne présume qu'un câble évalué avec succès par cette méthode satisfera également aux exigences de l'IEC 60331-1 ou l'IEC 60331-2. Les essais de ces deux normes doivent être réalisés séparément. Ces performances supplémentaires peuvent être reconnues par marquage conformément à l'Article 11 de l'IEC 60331-1 ou l'Article 11 de l'IEC 60331-2.
L'Annexe A donne la méthode de vérification du brûleur et le système de contrôle utilisé pour l'essai.
Cette deuxième édition annule et remplace la première édition parue en 2009. Elle constitue une révision technique.
Les modifications techniques majeures par rapport à l'édition précédente sont les suivantes:
– extension du domaine d'application aux câbles métalliques de données et de télécommunications et aux câbles à fibres optiques, bien que les informations concernant le point spécifique de défaillance, le dispositif de contrôle de la continuité, l'échantillon d'essai, la procédure d'essai et le rapport d'essai pour les câbles métalliques de données et de télécommunications et pour les câbles à fibres optiques ne soient pas données dans l'IEC 60331-3;
– amélioration de la description de l'environnement d'essai;
– utilisation obligatoire des débitmètres/régulateurs massiques comme moyens précis de contrôle exact des débits d'entrée de combustible et d'air au brûleur;
– amélioration de la description des informations à inclure dans le rapport d'essai.

General Information

Status
Published
Publication Date
27-Mar-2018
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
28-Mar-2018
Completion Date
28-Mar-2018
Ref Project

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IEC 60331-3:2018 - Tests for electric cables under fire conditions - Circuit integrity - 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
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IEC 60331-3
Edition 2.0 2018-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Tests for electric cables under fire conditions – circuit integrity –
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

Essais pour câbles électriques soumis au feu – intégrité des circuits –
Partie 3: Méthode d'essai au feu pour les câbles de tension assignée au plus
égale à 0,6/1,0 kV, soumis à essai sous conduit métallique avec chocs, à une
température d'au moins 830 °C
IEC 60331-3:2018-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60331-3
Edition 2.0 2018-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Tests for electric cables under fire conditions – circuit integrity –
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
Essais pour câbles électriques soumis au feu – intégrité des circuits –
Partie 3: Méthode d'essai au feu pour les câbles de tension assignée au plus
égale à 0,6/1,0 kV, soumis à essai sous conduit métallique avec chocs, à une
température d'au moins 830 °C
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.20 ISBN 978-2-8322-6152-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60331-3:2018 © IEC 2018
CONTENTS

CONTENTS ............................................................................................................................ 2

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Test environment ............................................................................................................. 8

5 Test apparatus ................................................................................................................ 9

5.1 Test equipment ....................................................................................................... 9

5.2 Metal enclosure ...................................................................................................... 9

5.2.1 Material and dimensions .................................................................................. 9

5.2.2 Metal enclosure selection ................................................................................ 9

5.3 Test ladder and mounting ....................................................................................... 9

5.4 Source of heat ...................................................................................................... 15

5.4.1 Burner ........................................................................................................... 15

5.4.2 Flow meters and flow rates ............................................................................ 16

5.4.3 Verification .................................................................................................... 17

5.5 Shock-producing device ........................................................................................ 18

5.6 Positioning of source of heat ................................................................................. 18

5.7 Continuity checking arrangements for electric power and control cables with

rated voltage up to and including 600 V/1 000 V ................................................... 18

5.8 Fuses.................................................................................................................... 18

6 Test specimen (electric power and control cables with rated voltage up to and

including 600 V/1 000 V) ................................................................................................ 19

6.1 Test specimen preparation .................................................................................... 19

6.2 Test specimen mounting ....................................................................................... 19

7 Test procedure (electric power and control cables with rated voltage up to and

including 600 V/1 000 V) ................................................................................................ 19

7.1 Test equipment and arrangement .......................................................................... 19

7.2 Electrical connections ........................................................................................... 20

7.3 Flame and shock application ................................................................................. 21

7.4 Electrification ........................................................................................................ 21

8 Performance requirements (electric power and control cables with rated voltage

up to and including 600 V/1 000 V) ................................................................................ 22

8.1 Flame application time .......................................................................................... 22

8.2 Acceptance criteria ............................................................................................... 22

9 Retest procedure ........................................................................................................... 22

10 Test report (electric power and control cables with rated voltage up to and

including 600 V/1 000 V) ................................................................................................ 22

Annex A (normative) Verification procedure for the source of heat ....................................... 23

A.1 Measuring equipment ............................................................................................ 23

A.2 Procedure ............................................................................................................. 23

A.3 Evaluation ............................................................................................................. 24

A.4 Further verification ................................................................................................ 24

A.5 Verification report ................................................................................................. 24

---------------------- Page: 4 ----------------------
IEC 60331-3:2018 © IEC 2018 – 3 –

Annex B (informative) Guidance on the choice of recommended test apparatus (burner

and venturi) ................................................................................................................... 25

Bibliography .......................................................................................................................... 26

Figure 1 – Schematic diagram of test configuration ............................................................... 11

Figure 2 – Recommended method of mounting the metal enclosure to the test ladder ........... 12

Figure 3 – Plan view of fire test equipment ........................................................................... 13

Figure 4 – End elevation of fire test equipment (not to scale) ................................................ 14

Figure 5 – Typical rubber bush for supporting the test ladder ................................................ 15

Figure 6 – Burner face .......................................................................................................... 16

Figure 7 – Schematic diagram of an example of a burner control system .............................. 17

Figure 8 – Basic circuit diagram ............................................................................................ 21

Figure A.1 – Temperature measuring arrangement ............................................................... 23

Table 1 – Enclosure dimensions ............................................................................................. 9

Table 2 – Multicore sheathed cable ....................................................................................... 19

Table 3 – Single core unsheathed or sheathed cable ............................................................ 19

---------------------- Page: 5 ----------------------
– 4 – IEC 60331-3:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS FOR ELECTRIC CABLES UNDER FIRE CONDITIONS –
CIRCUIT INTEGRITY –
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
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

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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 60331-3 has been prepared by IEC technical committee 20:

Electric cables.

This bilingual version (2018-11) corresponds to the monolingual English version, published in

2018-03.

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,

---------------------- Page: 6 ----------------------
IEC 60331-3:2018 © IEC 2018 – 5 –

test sample, test procedure and test report relevant to metallic data and telecom cables

and optical fibre cables are not given by IEC 60331-3;
– improved description of the test environment;

– mandatory use of mass flow meter/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
20/1782A/FDIS 20/1794/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.
The French version of this document has not been voted upon.

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 stability date indicated on the IEC website 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: 7 ----------------------
– 6 – IEC 60331-3:2018 © 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.

IEC 60331-3 introduces apparatus and a procedure to allow cables to be tested in a metal

enclosure under conditions of mechanical shock as well as fire at temperature of at least

830 °C.
---------------------- Page: 8 ----------------------
IEC 60331-3:2018 © IEC 2018 – 7 –
TESTS FOR ELECTRIC CABLES UNDER FIRE CONDITIONS –
CIRCUIT INTEGRITY –
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
1 Scope

This part of IEC 60331 specifies the test method for cables which are required to maintain

circuit integrity when tested in a metal enclosure and 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 not greater than 20 mm overall diameter.

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 60331-3.

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.

It is not assumed that cables successfully assessed by this method, will also pass

requirements for either IEC 60331-1 or IEC 60331-2. Testing to either of these two standards

is to be carried out separately. Such additional performance can be recognised by the

marking in accordance with IEC 60331-1:2018 Clause 11 or IEC 60331-2:2018 Clause 11.

Annex A provides the method of verification of the burner and control system used for the

test.

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 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
---------------------- Page: 9 ----------------------
– 8 – IEC 60331-3:2018 © IEC 2018

IEC 60331-1:2018, Test for electric cables under fire conditions – Circuit integrity – Part 1:

Test for circuit integrity under conditions of fire with shock at a temperature of at least 830 °C

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

exceeding 20 mm

IEC 60331-2:2018, Test for electric cables under fire conditions – Circuit integrity – Part 2:

Test for circuit integrity under conditions of fire with shock at a temperature of at least 830 °C

for cables of rated voltage up to and including 0,6/1,0kV and with an overall diameter not

exceeding 20 mm
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
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 in order to observe the behaviour of the cable during the test. Fume

exhaust should be achieved by means of natural draught through a chimney located at least

1 m from the burner. A damper may be used for adjustment of ventilation conditions.

NOTE Experience has shown a chamber similar to the "3 m cube" specified in IEC 61034-1 to be suitable.

The chamber and test apparatus shall be at a temperature of between 10 °C and 40 °C at the

start of each test.

The same ventilation and shielding conditions shall be used in the chamber during both the

verification and cable test procedures.
---------------------- Page: 10 ----------------------
IEC 60331-3:2018 © IEC 2018 – 9 –
5 Test apparatus
5.1 Test equipment
The test equipment shall consist of the following:

a) a metal enclosure, through which the test specimen(s) are drawn, constructed from a

straight stainless steel tube of circular cross-section as described in 5.2;

b) a test ladder, onto which the metal enclosure is mounted, comprising a steel framework

fastened to a rigid support as described in 5.3;

c) a source of heat comprising a horizontally mounted ribbon burner as described in 5.4;

d) a shock-producing device as described in 5.5;

e) a test wall equipped with thermocouples for verification of the source of heat as described

in Annex A;
f) a continuity checking arrangement as described in 5.7;
g) fuses as described in 5.8.

A general arrangement of the test equipment is shown in Figure 1, Figure 2, Figure 3 and

Figure 4.
5.2 Metal enclosure
5.2.1 Material and dimensions

The enclosure shall comprise a straight stainless steel tube of circular cross-section,

manufactured free from surface irregularities. The metal enclosure shall be (1 300 ± 50) mm

long and shall conform to dimensions as detailed in Table 1.

NOTE 1 Metal conduit as defined in IEC 60614-2-1:1982 has been found to be suitable for the enclosure.

NOTE 2 AISI grades 304 and 316 have been found to be suitable materials for the enclosure.

Table 1 – Enclosure dimensions
Size Wall thickness
mm mm
20 1,6 ± 0,15
40 1,6 ± 0,15
5.2.2 Metal enclosure selection

The particular metal enclosure shall be selected using the criteria given in 6.2.

5.3 Test ladder and mounting

The test ladder shall consist of a steel framework as shown in Figure 1. The vertical elements

of the ladder shall be fixed at (400 ± 20) mm spacing. The test ladder shall be

(1 200 ± 100) mm long and (600 ± 50) mm high, and the total mass of the test ladder shall be

(18 ± 1) kg. Ballast, if required, shall be placed on the steel supports.

NOTE 1 Angle iron approximately 45 mm wide and 6 mm thick, with suitable slots cut to allow for fixing of the

bolts or saddles, has been found to be a suitable material for construction of the ladder.

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– 10 – IEC 60331-3:2018 © IEC 2018

The metal enclosure shall be rigidly mounted centrally on the test ladder, as shown

in Figure 2.
...

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