In article ,
Tim Watts wrote:
You could legitimately take a single earth to the nearest light on the
same circuit that does have an earth. For this, it would be preferable
to use a single insulated earth wire with green/yellow insulation. Often
called "singles" and available from all good electrical wholesalers
(some like TLC should be able to sell a length rather than a reel).

Chances are since it's old wiring there is no earth to any lighting
circuit.

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*Very funny Scotty, now beam down my clothes.

Dave Plowman London SW
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