Any requirements to have pressure test 3.5KV 1 min on 600/1000V BS 6724 cable in field?

Question

I know the similar requirements for LV cable manufacturers and LV switchboard in field. But never heard to test on new installed cable. Is there any risk to have breakdown?

broadgage · Accepted Answer

I am not aware of any requirement for 3.5 KV testing of 600/1000 volt cables under UK wiring regulations. I have installed loads and never once tested at more than 1000 volts. 
 Requirements overseas may differ, and one should comply with any such requirements. Some clients or consulting engineers may require a test at 3.5 KV and if the person paying for the work wants this then it must be done. 
 If the cable is of good quality and correctly installed there should be no question of breakdown at that voltage.

mapj1 · Answer

Are you being asked to test an LV (400V ) cable at 3.5kV after it has been installed ? It would be unusual, and is more of a test of whatever is connected to the ends and the quality of terminations than the cable itself. Great care would be needed to ensure that there was nothing already connected that was not going to track over or flash over. 
 I'd suggest that there needs to be a very special situation that needs this, and I cannot think of one right now, and normally it is both unnecessary and unwise. 
 I'd also check that whoever wants the test done is happy to pay for any repair that might be needed should it cause damage. 
 Mike

Any requirements to have pressure test 3.5KV 1 min on 600/1000V BS 6724 cable in field?

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