In an earlier contribution to this discussion,
Doctor Drivel wrote:


"What it does is electrically tie together all accessible conductive
parts (pipes, taps, electrical appliances etc) that could under fault
conditions introduce a dangerous potential into the room. "

A rank amateur would look at that and not know what potential is.
"Potential" needs a explanation at this point.

Anyone who doesn't understand the word "potential" in relation to
electricity shouldn't go anywhere *near* mains house-wiring!
--
Cheers,
Roger
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