Hi, not being funny, but for a start off, someone else cannot certificate your work. - Yes they can happens in the real world every day as long as its inspected at key stagesBefore you even start you need to make your mind up what shower you are having or otherwise how are you going to even start to calculate the cable size and MCB required. - He is running a 10mm at 15m so he has made allowance for the max shower size on the market
What about all the cable related calcs you have forgotten about, that you need to size your cable properly. It is not just the rating of the shower you need. There are correction factors for where the cable is run, as in, with others, or in insulation, what about ambient temperature, volt drop, checking cpc size is adequate? - Its 10mm T&E cable over 15m the cpc is part of it and likely to be adequate in 25 years of working on domestic jobs with showers over this distance I cannot recall one where that was not suitable. But I'm sure he will ask his electrician to check it for him. Give the guy some slack he is here asking and not just doing it.
Guessing as to what the requirements for bonding etc are is not too good either! - Thats why he is asking questions! and he said his spark signed it off during a CU upgrade
As previous forum members have said, how are you going to test the completed installation and really importantly, please understand that like Nozspark said, working and safe, are too completely different things. - He answered that in his last post, he is using the electrician that did his CU upgrade to test it.
I am going to give you a bit of advice here.... I know you say you find BS7671 confusing, but go back and have a good read. The answers to all your questions are in it!! - Not all his questions are within the BRB, more practical ones are not hence the reason the OP is asking questions and if the BRB had all the answers to all things electrical there would no forum cus we would all read the book
Have a good read of appendix 4, chapter 54 and section 701
Everyone on here will try to advise you, but in the long run you would be much better off if you made a big effort to find out for yourself. You will have a much greater understanding then. There is a BIG difference between merely "knowing" [cos someone told you] and understanding... - WHAT!!! Get off your box, that