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im using a proteous cu 32 amp fot 7.5kw shower

furthur to my previous post ihave a 7.5kw shower running off 6mm cable on a 32 amp mcb lenghth aprox 8ft from comsumer unit to 45amp iso switch then to shower unit 8ft total lenghth approx if i was to upgrade to 8.5kw rather than 9.5 would you say i could use exisiting or up grade to 10mm of a...

i am going to install a 9.5kw electric shower i have a 7.5kw at present running on 6mm cable on a 32amp mcb the distance between fuse box and isolator switch is around 8ft running up side of wall via trunking in to loft to iso/switch would 6mm cope with 9.5kw or would it be best to change cable...