IEC 60331-1 Edition 1.0 2009-05

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 Standard IEC 60331-1 has been prepared by IEC technical committee 20: Electric cables. This first edition of IEC 60331-1 cancels and replaces IEC 60331-12 (2002) and IEC 60331-31 (2002) to form one single standard.

This publication 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 the parts in the IEC 60331 series, under the general 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  You are not allowed to view links. Register or Login" in the data related to the specific publication. At this date, the publication will be

• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

CONTENTS
FOREWORD...4
INTRODUCTION...6
1Scope...7
2Normative references...7
3Terms and definitions ...8
4Test conditions –Test environment...................................................................................8
5Test apparatus ...8
5.1Test equipment...8
5.2Test ladder and mounting ......................................................................................12
5.3Source of heat ...12
5.3.1Burner ...12
5.3.2Flow meters and flow rates ........................................................................13
5.3.3Verification ................................................................................................14
5.4Shock producing device .........................................................................................14
5.5Positioning of source of heat..................................................................................15
5.6Continuity checking arrangements .........................................................................15
5.7Fuses ...15
6Test specimen ...15
6.1Test specimenpreparation.....................................................................................15
6.2Test specimen mounting ........................................................................................16
7Test procedure ...17
7.1Test equipmentand arrangement...........................................................................17
7.2Electricalconnections ............................................................................................17
7.3Flame and shockapplication..................................................................................19
7.4Electrification...19
8Performance requirement ...............................................................................................20
8.1Flame application time...........................................................................................20
8.2Acceptance criteria ................................................................................................20
9Retest procedure ...20
10Test report...20
11Cable marking ...20
Annex A (normative) Verification
procedure for the source of heat ........................................21
Annex B (informative) Guidance on the choice of recommended test apparatus ....................23
Bibliography ...24
Figure 1 – Schematic diagramof test configuration..................................................................9
Figure 2 – Plan view offire test equipment ............................................................................10
Figure 3 – End elevation of fire test equipment (not to scale) .................................................11
Figure 4 – Typical rubber bush for supporting the test ladder .................................................12
Figure 5 – Burner face ...13
Figure 6 – Schematic diagram of an example of a burner control system usingrotameters ....14
Figure 7 – Example of method of mounting a larger diameter test specimen for test...............16
Figure 8 – Detailed section of adjustable position of vertical ladder elements for mounting a smaller diameter test specimen for test .......17
Figure 9 – Basiccircuit diagram .......................................................................19
Figure A.1 – Temperature measuring arrangement ................................................................21

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