A
Adders1
I have a split CU and have just added a new ring (14 sockets) a 10.5k shower and lighting circuit. All of these are as a result of a third floor being added to the house. Everything works perfectly but when the shower is on and I use my drill in any of the 3rd floor sockets, the RCD trips. I have moved the shower and sockets to the 'non RCD' side of the CU and this works fine with no tripping of the MCB. Clearly this isn't correct and I need to rectify the fault before moving the wiring back to the RCD side. Any ideas please? Adders