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Borrowing a cpc from another cct for lighting cct coded C2 in PE magazine codebreakers.

hertzal123

Just read in the above February mag the sparks has  borrowed the cpc

from another cable in the process of changing a kitchen into a utility room.,because the

lighting cct had no cpc.

Thought this was allowed under 543.1.2  if the borrowed cpc was of adequate size?

The article states"the 2 circuits are no longer seperate or individually isolatable,as they are

now linked".

                                                                                        Regards,

                                                                                              Hz

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    We do not normally consider the CPC to be part of the working circuit. It is not nice if a  CPC follows a different route to the appliance as the L and N, as it may be accidentally broken and not noticed, but it is not a regulatory fail  as such - after all we could be using metal trunking as the CPC.  I detect over-zealousness again.

    Under what conditions of isolation do you switch a CPC anyway ? (apart from gensets in parallel with the mains, which I presume this is not.)

    Mike.

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  • 0

    We do not normally consider the CPC to be part of the working circuit. It is not nice if a  CPC follows a different route to the appliance as the L and N, as it may be accidentally broken and not noticed, but it is not a regulatory fail  as such - after all we could be using metal trunking as the CPC.  I detect over-zealousness again.

    Under what conditions of isolation do you switch a CPC anyway ? (apart from gensets in parallel with the mains, which I presume this is not.)

    Mike.

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