IEC 60331-3:2009

IEC 60331-3 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
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, essayés sous conduit métallique avec chocs, à une
température d’au moins 830 °C
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IEC 60331-3 ®
Edition 1.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
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, essayés sous conduit métallique avec chocs, à une
température d’au moins 830 °C
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 13.220.40; 29.20; 29.060.20 ISBN 978-2-88910-126-9
– 2 – 60331-3 © IEC:2009
CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

2 Normative references.7

3 Terms and definitions .7

4 Test conditions – Test environment.8

5 Test apparatus .8

5.1 Test equipment.8
5.2 Metal enclosure .13
5.2.1 Material and dimensions .13
5.2.2 Metal enclosure selection.13
5.3 Test ladder and mounting .13
5.4 Source of heat .14
5.4.1 Burner .14
5.4.2 Flow meters and flow rates .15
5.4.3 Verification .16
5.5 Shock producing device.16
5.6 Positioning of source of heat.17
5.7 Continuity checking arrangements .17
5.8 Fuses .17
6 Test specimen .17
6.1 Test specimen preparation.17
6.2 Test specimen mounting.18
7 Test procedure .18
7.1 Test equipment and arrangement.18
7.2 Electrical connections .18
7.3 Flame and shock application.20
7.4 Electrification.20
8 Performance requirement .21
8.1 Flame application time.21
8.2 Acceptance criteria .21
9 Retest procedure .21

10 Test report.21
Annex A (normative) Verification procedure for the source of heat .22
Annex B (informative) Guidance on the choice of recommended test apparatus .24
Bibliography .25

Figure 1 – Schematic diagram of test configuration.9
Figure 2 – Recommended method of mounting the metal enclosure to the test ladder .10
Figure 3 – Plan view of fire test equipment .11
Figure 4 – End elevation of fire test equipment (not to scale) .12
Figure 5 – Typical rubber bush for supporting the test ladder .14
Figure 6 – Burner face .15

60331-3 © IEC:2009 – 3 –
Figure 7 – Schematic diagram of an example of a burner control system using

rotameters .16

Figure 8 – Basic circuit diagram .20

Figure A.1 – Temperature measuring arrangement .22

Table 1 – Enclosure dimensions.13

Table 2 – Multicore sheathed cable .18

Table 3 – Single core unsheathed or sheathed cable .18

– 4 – 60331-3 © IEC:2009
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
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