I have read aome of the posts and need some help. We currently have a 7.5kw electric shower, we have 6mm cable and a 30amp fuse at present. What is the highest kw shower we can go to without changing the cable. Dont mind changing the amp fuse, but trying to do without changing the cable. We had bought a 9.5kw shower to replace it with and 10mm cable and 50 amp fuse, but we have found that we might have difficulty changing the existing cable from where it is positioned. Also is there a maximum length that the cable can be used, i.e we think that our cable at present stretches a distance of 10 metres, is it ok to longer than 10 metres. Please help with advice.