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Harry Bloomfield[_3_]

presented the following explanation :
If you put a voltmeter across the earth and neutral connections you
may find a fairly high voltage exists between them.

There might be a few volts, maybe 20 between N and E.

One of my sockets has 110 volts across those wires. It varies on other
sockets down to a few volts.

There should be no large variation when checked between the N & E of
one circuit and the N & E of another. The actual voltage can wonder
about a bit though due to various factors. I would be quite concerned
if I saw 110v.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk