In my case 2, the high level run S.W.A. entered an all insulated enclosure unglanded and not connected to earth at both ends. The three core S.W.A. was connected as L., N. and C.P.C.
Z.
In this case, an undetected fault to armour might leave the armour "live" and wouldn't necessarily be detected by the tests prescribed in BS 7671 (insulation resistance test to cpc or earth won't pick it up) - you'd specifically need to test to armour. What if the outer sheath becomes damaged at some point?
Thinking about the permutations logically, I'm tending towards it being negligent, in most cases, to avoid earthing armour of a cable operating at low voltage, unless some other precautions are taken.
In my case 2, the high level run S.W.A. entered an all insulated enclosure unglanded and not connected to earth at both ends. The three core S.W.A. was connected as L., N. and C.P.C.
Z.
In this case, an undetected fault to armour might leave the armour "live" and wouldn't necessarily be detected by the tests prescribed in BS 7671 (insulation resistance test to cpc or earth won't pick it up) - you'd specifically need to test to armour. What if the outer sheath becomes damaged at some point?
Thinking about the permutations logically, I'm tending towards it being negligent, in most cases, to avoid earthing armour of a cable operating at low voltage, unless some other precautions are taken.
