Which regulations(s) require the steel wire armouring of a S.W.A. cable to be earthed if it is NOT used as a circuit protective conductor?
Case 1. Cable buried underground.
Case 2. Cable NOT buried underground.
Z.
Case 1: covered by a specific Reg 522.8.10 so always required if buried direct without any mechanical protection
Case 2: if the cable carries anything other than SELV or PELV, then always required because it's a reasonable assumption that the wire armour could become live under fault conditions since double insulation is not "assumed to exist". Unfortunately I can’t find a regulation to support that other than 411.3.1.1 if the armour can be touched in some way, otherwise it’s not an exposed conductive part in terms of the strict definition in Part 2. However, for what it is worth, reference regulation or not, I wouldn’t dream of not earthing the wire armour in a low voltage cable!
Which regulations(s) require the steel wire armouring of a S.W.A. cable to be earthed if it is NOT used as a circuit protective conductor?
Case 1. Cable buried underground.
Case 2. Cable NOT buried underground.
Z.
Case 1: covered by a specific Reg 522.8.10 so always required if buried direct without any mechanical protection
Case 2: if the cable carries anything other than SELV or PELV, then always required because it's a reasonable assumption that the wire armour could become live under fault conditions since double insulation is not "assumed to exist". Unfortunately I can’t find a regulation to support that other than 411.3.1.1 if the armour can be touched in some way, otherwise it’s not an exposed conductive part in terms of the strict definition in Part 2. However, for what it is worth, reference regulation or not, I wouldn’t dream of not earthing the wire armour in a low voltage cable!
