hi, i have recently replaced my electric shower unit myself,, its a redring 7.2, running off 6mm cable, the previous was a redring so plumbing in was no bother, however ive since read all sorts of stuff to do with rcd, correct fuse, length of cable etc, it seems to be working fine, im sure all these things are VERY relevant, however in my particular situation im hoping they are not, any thoughts please and a happy new year