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Is there a way I can test a shower circuit for overloading with a multimeter if so how do you do it and what readings should I look for in a circuit for a 9.5kw shower

can anyone tell me how to tell the difference between 6 and 10 mm square cable as I saw them in B+Q but they both looked the same?

I have recently moved house, the previous houses shower was a 9.5kw shower ,when in use the lights hardly dimmed, barely noticable. In the house I have moved to fitted shower with 10 mm square cable isolating switch and own ciruit ,the whole gubbins so how come the lights dim quite a bit when...

can anyone recommend a good efficient oil fired combi boiler for a 3 to 4 bedroomed house and,(possible silly question) could it be fitted in the loft. the tank being on ground level?

I have recently moved house and the shower ,after about 10 mins trips the breaker switch, when reset it trips again shortly after. the shower has its own circuit but didnt have an isolating switch outside bath room. Also another problem is that the lights dim and filicker when no other...