IEC 60331-1:2009 pdf free download

IEC 60331-1:2009 pdf free download
IEC 60331-1:2009 pdf free download.Tests for electric cables under fire conditions – Circuit integrity
6.2 Test specimen mounting
The test specimen shall be bent to form an approximate arc of a circle. The internal radius of the bend shall be the manufacturer’s declared minimum bending radius.
The test specimen shall be mounted centrally on the test ladder, as shown in Figure 7, using metal clips which shall be earthed. Two U-bolts on the upper horizontal element of the ladder are recommended, but P-clips made of metal strip (20 ± 2) mm wide for cables from 20 mm up to 50 mm in diameter, and (30 ± 3) mm wide for larger cables shall be used on the central vertical elements. The P-clips shall be formed so as to have approximately the same diameter as the test specimen under test.
If the test specimen is too small to be mounted on the central vertical elements when in the position shown in Figure 7, the vertical elements shall be equally moved towards the centre so that the specimen may be mounted as shown in Figure 8.
7.1 Test equipment and arrangement
The test procedure shall be carried out using the apparatus detailed in Clause 5.
Mount the test specimen on the test ladder and adjust the burner to the correct position relative to the test specimen in accordance with 5.5.
7.2 Electrical connections
At the transformer end of the test specimen, earth the neutral conductor and any protective conductors. Any metal screens, drain wire or metallic layer shall be interconnected and earthed. Connect the transformer(s) to the conductors, excluding any conductor which is specifically identified as intended for use as a neutral or a protective conductor, as shown in the circuit diagram in Figure 9. Where a metallic sheath, armour or screen acts as a neutral or protective conductor, it shall be connected, as shown in the circuit diagram in Figure 9, as for a neutral or protective conductor.
For single-, twin- or three-phase conductor cables, connect each phase conductor to a separate phase of the transformer(s) output with a 2 A fuse or circuit-breaker with equivalent characteristics in each phase.