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I've just bought a 10,5Kw electric shower to replace the 8,5Kw one which has worked happily for 10years and now failed. The 8,5Kw unit is wired with 6mm T&E which I'm told is not suitable for the newer unit. Is 10mm T&E enough or does it need to be 16mm? The cable run is about 15Metres. Shower...