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Best advice, I can offer you, especially as its seems we have the mega-power-shower-heads in, is Give your shower maker a ring on their helpline. Mine informs me that in my case, 6mm is fine. Your circumstances may be different. Im not one for making light hearted comment at your expense...

found this odd link re: 6mm(2) for showers upto 9.5kw... http://www.plumbworld.co.uk/220-16724 Ideal for use on electric showers up to 9.5kw D.W

sorry here some more data on my shower: 8mtr cble run (6mm sq) clipped direct to wall, mini-rcb 45amp, shower 9.5kw, cable seems fine, and fitted about 10 years ago. DW Please note, Im not here to score points over anyone, just relaying what I have and what works for me!

At present we have 6mm(sq) cable 13.5mm x 7mm, and that works fine on our shower. As for cable sizing try: http://www.diynot.com/pages/el/el004.php Regards, D.W