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Oh hell. So I'm not actually going to be able to get a new one? I'm jjst looking now and not having much luck!

It looks like it's made by Proteus. A fairly old thing - about 15 years.

To be honest I hadn't considered it. The last shower, fitted over 12 years ago, didn't have one. I don't really know much about RCDs. Can you get combined RCD/MCBs? I'll certainly put in now.

Thank you very much for all the responses. I was fully expecting the internet version of sucking through teeth but this has all been really useful. Excellent tip sparkwright, thanks for that. I don't for one second underestimate the seriousness of getting this stuff wrong. By nature I err...

Ah sorry! Yeah the join will be in the attic space of the garage, just before the cable goes into the main body of the house. I'm going to use a junction box at the moment. although finding one big enough is a struggle! Any suggestions? I've deliberated for weeks over the route to take. This...

Also - another question! If at worst case as OilLecky mentions the shower is drawing 47amps, why is it that a 40amp circuit breaker will suffice? Won't it trip at 40amps?

Ah! Yes. That old chestnut! I know - I'd rather not have it. I stupidly bought 10meters of the cable and then another 10meters. £35 per roll from B&Q! If it's an absolute no-no then I'll have to go and buy just one lot of 20meters. I'd rather another £70 layout than a burned down house.

Brilliant. Thank you very much. OilLecky thank you very much for the detail - much appreciated. It helps with the understanding. I was getting worried that I might have had to start dragging out the 10mm twin and earth and replacing it with 16mm. I seem to remember from electronics...

Thank you very much for the response. Much appreciated. Out of curiosity, what's the reason for avoiding loft insulation?

Hi all I have a few questions that hopefully someone will be able to clear up…. First off: Is my shower 10.8kw? On the box it says 10.8kw for 240v, but then in slightly small writing it say 9.9kw at 230v. Now I know UK supply rms is 230v so maybe that answers my own question but…...