Cheers in advance for your opinions.
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Discuss Help please, What would you do? in the UK Electrical Forum area at ElectriciansForums.net
Thanks for your reply.Without being there it's hard to say... but have you looked in the switch that controls these?
It could be that the CPC in the red (grey sheated single) is actually being used as the permanent live. If that's not the case have you been able to establish where that black single connected to the CPC goes?
I'd also be concerned about the materials of those black singles. They look remarkably like rubber so your client may have a bigger problem as that stuff should have been dealt with when the lights were installed (at least in my opinion, I wouldn't be making changes/additions to an installation wired in rubber).
In that case, I might proceed as follows... With the black single connected to CPC disconnected, I'd confirm the CPC in the grey single is actually connected to earth with either a long lead test back to the board or by a simple continuity between it and the neutral in that box. I'd then safely contain the end of that black single and restore power and check earthing elsewhere on the circuit and ensure everything else is working as expected.
If it transpires it provides the CPC for some other point in the circuit I would mark it up as such and crack on with the job. If in fact it provides the neutral, then check the earthing, mark it up and connect it correctly.
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