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On Thursday, 13 February 2020 21:59:54 UTC, TimW wrote:

The steel pipe was leaking so I have taken it all out and replaced with
blue plastic pipe. Was looking at the earth arrangement and wondering if
I need to earth the wiring in another way, into the ground or something,
or are we still earthed through the water in the plastic pipe out to the
outside world?

All more erudite considerations apart, the Water Boards do not guarantee
that their water will be present at all times that the electricity is on.

It isnt the water that matters, its the pipe,