Hi there. I've just fitted a 10.5kw shower. There was nothing there before. So fitted a Crabtree Starbreaker 63a 30mA RCCB with a 50A MCB, a 16metre run of 10mm T&E feeding the shower via a 20A DP switch. I've plumbed the shower in Speedfit plastic pipe. The only earth connection is via the terminal block in the shower. The problem is that with the DP switch ON everything's ok, but the RCCB trips the instant the shower start button is pressed.
Any help would be greatly appreciated.
Any help would be greatly appreciated.