Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, about a separate circuit protective conductor (CPC) in an SWA electrical circuit, is answered by SELECT:
If a separate CPC is run for the circuit, should this be binded to the SWA as per Regulation 543.6.1?
Also, should we class SWA as a ferromagnetic enclosure? If so, how do we apply Regulation 521.5.2 when running a separate CPC?
Answer: In this instance, as you are using the armour plus a separate conductor as the CPC, as long as they are in close proximity it would not necessary to bind them together.
Where the SWA is terminated at a metal enclosure, the separate CPC could be connected to the earth tag (e.g. via a crimped terminal) at the SWA gland.
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