MM wrote:
On Tue, 8 Mar 2011 18:16:14 -0000, "ARWadsworth"
wrote:
I'll second that and just add that unless all the supply cables are
superconductors then the voltage will vary according to the load in
both MMs house and neighbouring houses.

MM - It is not unusual for the voltage to drop by as much as 8
volts in a house when an electric shower is switched on depending
upon the external resistance of the supply to the house.

When I first observed the 250v this morning there was only the PC
on.

And did you go and ask all the neighbours what they were using?

Well, no!

Well there you are. Short of logging all the neighbours supplies you will
never know who turned on or off their electical devices:-)

Your electricity supply is normal.

Cheers
--
Adam