I was attempting to extend my ring main to add a socket at the weekend. I removed the wires from a socket, tested them and found one live cable and two not live.
This suggests that the socket had two ring main cables going in and one spur, but one side of the ring main had a break in it. I couldn't tell which was the spur and which were the ring main cables, so I couldn't extend the ring main.
I've opened up all the sockets in the house and they all seem to be wired correctly, although I didn't remove and clean up all the wires.
How can I find out where the problem is? Are there any test tools available?
My house is an early 40's BISF steel frame construction.