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My old 7.5kw shower is knackered and I've bought an Essentials 8.5kw/9,5kw (medium setting and high setting). the cable run is about 8m long on 6mm twin and earth. My CU is a relatively old (wylex) and is connected into a 32a mcb, I don't hink there is a 40a mcb available for this CU Will...