AS/NZS IEC 60331.2:2021 pdf free download.Tests for electric cables under fire conditions – Circuit integrity Method 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.
4 Test environment
The test shall be carried out in a draught-free environment within a suitable chamber, of minimum volume 20 m3, 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.
5 Test apparatus
5.1 Test equipment
The test equipment shall consist of the following:
a) a test wall onto which the cable is mounted, comprising a board manufactured from heat-resistant, non-combustible material suitable for the temperatures involved fastened to steel supports and mounted on 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 described in Annex A;
e) a continuity checking arrangement as described in 5.6;
f) fuses as described in 5.7.
A general arrangement of the test equipment is shown in Figure 1, Figure 2 and Figure 3.AS/NZS IEC 60331.2 pdf download.