AS NZS IEC 60331.2:2017 pdf free

AS NZS IEC 60331.2:2017 pdf free.Tests for electric cables under fire conditions – Circuit integrity
The test wall shall consist of a board of heat-resistant, non-combustible and non-metallic material fastened rigidly to two horizontal steel supports, one at the top of the board and the other at the bottom, as shown in Figure 1. Vertical supports may also be used. The board shall be (900±100) mm long and (300±50) mm high and (10±2) mm thick and the total mass of the test wall (i.e. board and steel supports) shall be (10,0±0,5) kg. Ballast, if required, shall be placed on the steel supports.
NOTE 1 Supports made from square section steel tube approximately 25 mm × 25 mm and approximately 1 m long have been found to be suitable.
NOTE 2 The top support should be fastened to the board so that its upper face is slightly above the upper edge of the board, so that the shock-producing device impacts on the support and not the board.
Each horizontal support shall have a mounting hole at each end, not more than 100 mm from the edge of the board, the exact position and diameter being determined by the particular supporting bush and supporting framework used. The test wall shall be fastened to a rigid support by four bonded rubber bushes of hardness 50- 60 Shore A fitted between the horizontal steel supports of the wall and the support framework, as shown in Figures 1 and 2 so as to allow movement under impact.
NOTE 3 A typical rubber bush, which has been found to be suitable, is shown in Figure 4.In order to check the mounting of the wall, the static deflection following application of a mass to the centre of the upper support of the wall shall periodically be measured.
The source of heat shall be a ribbon type propane gas burner with a nominal burner face length of 500 mm with a Venturi mixer. A centre-feed burner is recommended. The nominal burner face width shall be 10 mm. The face of the burner shall have three staggered rows of drilled holes, nominally 1,32 mm in diameter and drilled at centres 3,2 mm from one another, as shown in Figure 5. Additionally, a row of small holes milled on each side of the burner plate, to serve as pilot holes for keeping the flame burning, is permitted.AS NZS IEC 60331.2 pdf free download.