IEC 60331-2 Edition 1.0 2009-05

Tests for electric cables under fire conditions – Circuit integrity – 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.

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.
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CONTENTS
FOREWORD...4
INTRODUCTION...6
1Scope...7
2Normative references...7
3Terms and definitions ...7
4Test conditions –Test environment...................................................................................8
5Test apparatus ...8
5.1Test equipment...8
5.2Test wall and mounting ..........................................................................................11
5.3Source of heat ...13
5.3.1Burner ...13
5.3.2Flow meters and flow rates ........................................................................14
5.3.3Verification ................................................................................................15
5.4Shock producing device .........................................................................................15
5.5Positioning of source of heat..................................................................................16
5.6Continuity checking arrangements .........................................................................16
5.7Fuses ...16
6Test specimen ...16
6.1Test specimenpreparation.....................................................................................16
6.2Test specimen mounting ........................................................................................17
7Test procedure ...17
7.1Test equipmentand arrangement...........................................................................17
7.2Electrical connections ............................................................................................17
7.3 Flame and shock application..................................................................................19
7.4Electrification...19
8Performance requirements..............................................................................................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 (hardness:50-60 shore A) for fastening wall ..........................13
Figure 5 – Burner face ...14
Figure 6 – Schematic diagram of an example of a burner control system usingrotameters .......15
Figure 7 – Example of method ofmounting a sample for test .................................................17

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