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Thanks for quick reply I never did any work in the cu as the shower was just a replacement but i have noticed the MCB is 32A should i upgrade to 45A ++++++++++++++++++++++++++++++++++++++++++ Sorry the shower is 8.5Kw on 6mm cable through a 45A isolating switch

I have just wired my shower the wrong way live to neutral, neutral to live Ive replaced the shower and the isolating switch but when i now turn the shower on the RCD blows but the not the MCB Could i have blown one of them