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hi everyone. i'm hoping someone here can advise me on shower wiring. i have a 8.5kw shower, my cabling says 2x6+2.5 on it......i take it thats 6mmsq cable??? it will be running from a wylex cu with rcd main switch = 80A 30mA with a nsb40 40amp mcb. am i correct in thinking the 40 amp mcb...