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when you say too much is better.does that mean the higher rated the mcb, the better the protection

i've noticed that my built-in cooker is wired to a 50amp mcb in the c/u.i think the suggested size for it is 20amp.what effect if any will this have on the circuit protection

thanks,will change to 10mm to be on safe side

thanks nutallspark,the exsiting cable is 6mm,i know the recommend 10mm.would that cause me probs keeping the 6mm

thanks for info,the make of c/u is dorman smith,100amp switch and im upgrading my shower from 7.2 to 8.5kw hence i have to upgrade the mcb as the existing one is a 32amp

can you replace a 32amp mcb for a 40amp mcb on a consumer unit