I wired in a new CU last night for my 9.5kW shower. It has a 63A 30mA RCD and 50A MCB supplied. I bought a 40A MCB and fitted that in place of the 50A, as that is what was recommended by the shower manual. However, the 40A MCB trips after about 1 minute of shower use on a normal heat setting. With the 50A MCB fitted, there is no problem.
The cable used is 10mm2 and runs for about 10m.
Unfortunately the company does not seem to make 45A MCBs, will I be OK to continue with the 50A MCB?
The cable used is 10mm2 and runs for about 10m.
Unfortunately the company does not seem to make 45A MCBs, will I be OK to continue with the 50A MCB?