IEC 60332-1-2:2004 pdf download.Tests on electric and optical fibre cables under fire conditions
1 Scope
This part of IEC 60332 specifies the procedure for testing the resistance to vertical flame propagation for a single vertical electrical insulated conductor or cable, or optical fibre cable,under fire conditions. The apparatus is given in lEC 60332-1-1.
NOTE 1 Testing to IEC 60332-1-2 may be performed simultaneously with that to IEC 60332-1-3 if required.
Recommended requirements for performance are given in Annex A.
IEC 60332-1-2 specifies the use of a 1 kW pre-mixed flame and is for general use, except that the procedure specified may not be suitable for the testing of small single insulated conductors or cables of less than 0,5 mm2 total cross-section because the conductor melts before the test is completed, or for the testing of small optical fibre cables because the cable is broken before the test is completed. In these cases, the procedure given in IEC 60332-2-2 is recommended.
NOTE 2 Since the use of insulated conductor or cable which retards flame propagation and complies with the recommended requirements of this standard is not sufficient by itself to prevent propagation of fire under all conditions of installation, it is recommended that wherever the risk of propagation is high, for example in long vertical runs of bunches of cables, special installation precautions should also be taken. It cannot be assumed that because the sample of cable complies with the performance requirements recommended in this standard, that a bunch of cables will behave in a similar manner. (See IEC 60332-3 series.)
5.3 Positioning of test piece
The test piece shall straightened and be secured to two horizontal supports by means of a suitable size of copper wire, in a vertical position in the centre of the metal screen， as described in 4.2 of IEC 60332-1-1, so that the distance between the bottom of the upper support and the top of the lower support is (550±5) mm. In addition, the test piece shall be positioned so that the bottom of the specimen is approximately 50 mm from the base of the screen (see Figure 1).
The vertical axis of the test piece shall be arranged centrally within the screen (i.e. 150 mm from each side and 225 mm from the rear).
5.4.1 Positioning of flame
One burner, as described in 4.3 of IEC 60332-1-1, shall be ignited and the recommended flow rates of gas and air adjusted. The burner shall be positioned so that the tip of the inner blue cone impinges on the surface of the test piece at a distance of (475±5) mm from the lower edge of the upper horizontal support, whilst the burner is at an angle of 45°±2° to the vertical axis of the test piece (see Figure 2).IEC 60332-1-2 pdf download.