From Mike Kenny
The observations regarding domestic electrical earthing are most interesting
(Letters, 17 October, p 53).
Dangers arise without being noticed.
The system of copper water pipes is used as the earthing network in my house,
which is quite a common method. A leak occurred in the length of pipe between
the water company stopcock and the stopcock in our property. The faulty pipe was
replaced with a standard blue plastic pipe which now meets our stopcock about
six inches above ground level. So, no metal contact to earth—just through
the water in the pipe.
I am installing an earth spike to securely earth the network of pipes. I
wonder how many others are in the same situation.
Welwyn Garden City, Hertfordshire
