IEC 60332-1-2:2004 pdf free download

IEC 60332-1-2:2004 pdf free download
IEC 60332-1-2:2004 pdf free download.Tests on electric and optical fibre cables under fire conditions
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 ).
5.4 Flame application
Safety warning Precautions shall be taken to safeguard personnel against the following when conducting tests:
a) the risk of fire or explosion;
b) the inhalation of smoke and/or noxious products, particularly when halogenated materials are burned;
c) harmful residues.
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).
For flat-form cables, the flame impingement shall be on the middle of the flat side of the cable.
6 Evaluation of test results
After all burning has ceased, the test piece shall be wiped clean.
All soot shall be ignored if, when wiped off, the original surface is undamaged. Softening or any deformation of the non-metallic materials shall also be ignored. The distance from the lower edge of the top support to the upper onset of charring and the distance from the lower edge of the top support to the lower onset of charring shall be measured to the nearest millimetre.
Press against the cable surface with a sharp object, for example, a knife blade. Where the surface changes from a resilient to a brittle (crumbling) surface indicates the onset of charring.