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dingbat, the cable will be clipped or enclosed in plastic trunking. it wont be going near any insulation or be "burried" anywhere so I think it will be ok. INSPECTOR- I appreciate your input, but I think your suggestion may be overkill for what I want, and since I have spare bays in the...

FWL-Engineer, Thanks a lot, yes I will go with 6mm then. I don't see myself putting anything bigger in - ever. Oh, and as suspected the supply to my flat is still 240V (just got the multimeter to it) so I'm thinking the 40A mcb will be ok. Well I think I've found out what I need to know and...

Thanks all for your advice, I'll go ahead with the install without a rcd for now (showered for about 15 years in my parents house which didn't have one and I'm still alive!) but will fit one with new cu. I have 2 spare bays in the existing cu so I'll install the shower circuit into one of them...

br, thanks for the reply, yes, I agree about the rcd, but to fit a second cu or add a stand alone rcd is just too expensive at the moment. Do you think that 6mm cable will be ok? I thought it had to be 10mm for a 9.5kw? I will fit a rcd in a few months time when I renew the cu cos mine is quite...

Thanks fwl, I have bought a 40A MCB. (39.5A max current for 9.5KW right?). I'm not going to put a rcd in (can't stretch to the extra 50 quid at the moment) but I plan to add one later. Only thing I'm not sure of is if the main fuse can handle the 9.5kw shower, any ideas?

Firstly I have done a few small electrical alterations (lights, sockets, etc) but have not done anything with the consumer unit. (I did study electronics so have a grasp of the basics). I am going to install an electric shower, but am not sure on a couple of points. I intend to install a 9.5 KW...