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Thanks for your help everyone. I'll put in the 16mm cable to a block, wire in the shower and get a qualified electrician to come and check it over before go-live. Better to be safe than sorry, despite the jokes about inheritance! Earthing's my main worry with a shower of this size especially...

My father-in-law has asked me to install the electrics for his new shower. I have an electrical background (degree in electrical and electronic engineering) so I understand the theory, but welcome your advice. On inspection of his setup the existing 7kW shower ran off a 30A separate...