I have an old shower supply cable which I think is on a 10mm cable (could be 6mm) on a rcd - It all worked okay with a 8.5Kw shower until the bathroom was updated to a Mixer of the combi. The question is can the cable be 're-cycled' for supplying a double 13Amp socket (as a spur) Using a Fuse fitted to the end of the 10mm(6mm) prior to dropping to 2.5mm to the socket?