IEC 60331-1-2009 pdf free download – 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.
This part of lEC 60331 specifies the test apparatus and procedure and gives the performancerequirements，including recommended flame application times, for low voltage power cables ofrated voltage up to and including 0,6/1,0 kV and control cables with a rated voltage which arerequired to maintain circuit integrity when subject to fire and mechanical shock under specifiedconditions. It is intended for use when testing cables of greater than 20 mm overall diameter.
NOTE 1 Cables of smaller diameter should be tested using the apparatus，procedure and requirements ofIEC 60331-2.
This standard describes the means of test specimen preparation，the continuity checkingarrangements, the electrical testing procedure,the method of burning the cables and themethod of shock production, and gives requirements for evaluating test results.
NOTE2 Although the scope is restricted to cables with rated voltage up to and including 0,6/1,0 kV, the proceduremay be used, with the agreement of the manufacturer and the purchaser,for cables with rated voltage up to andincluding 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 tosignify compliance with this standard.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
lEC 60584-1，Thermocouples – Part 1: Reference tables
IEC 60269-3,Low-voltage fuses – Part 3: Supplementary requirements for fuses for use byunskilled persons (fuses mainly for household and similar applications) – Examples ofstandardized systems of fuses A to F
IEC Guide 104,The preparation of safety publications and the use of basic safety publicationsand group safety publications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
circuit integrity
ability of an electric cable to continue to operate in a designated manner whilst subjected to aspecified flame source for a specified period of time under specified conditions.
4 Test conditions – Test environment
The test shall be carried out in a suitable chamber, of minimum volume 10 m3, with facilities fordisposing of any noxious gases resulting from burning. Sufficient ventilation shall be availableto sustain the flame for the duration of the test.
NOTE 1 Guidance on the choice of suitable chambers is given in Annex B.
The chamber and test apparatus shall be at a temperature of between 10 °C and 40 °C at thestart of each test.
The same ventilation and shielding conditions shall be used in the chamber during both theverification and cable test procedures.
NOTE 2 The test given in this standard may involve the use of dangerous voltages and temperatures. Suitableprecautions should be taken against the risk of shock, burning, fire and explosion that may be involved, and againstany noxious fumes that may be produced.
5 Test apparatus
5.1Test equipment
The test equipment shall consist of the following:
a) a test ladder，on to which the test specimen is mounted,comprising a steel frameworkfastened to a rigid support as described in 5.2;
b) a source of heat comprising a horizontally mounted ribbon burner as described in 5.3;c) a shock-producing device as described in 5.4;
d) a test wall equipped with thermocouples for verification of the source of heat as describedin Annex A.
e) a continuity checking arrangement as described in 5.6f) fuses as described in 5.7
A general arrangement of the test equipment is shown in Figures 1,2 and 3.IEC 60331-1 pdf download.