I'd check that is the case by dropping a sheet of plastic in behind it and
then screwing it back, if it works then I think we can say that it is
flexing. I'm sure many moons ago when dimmer switches were all the rage,
some of them did come with a back box sized bit of plastic as often they
were deeper than a normal switch, and it meant that unless the earth lug
was in a very dafter place, then you got away with it.
Brian

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"Graham." wrote in message
...
Arthur Ravenscroft Wrote in message:
I've been updating the kitchen ring and came to a point
where it was ready for testing.
Most of the sockets are ok (3 lights on the socket testing device)
I put the testing device in the left hand socket of the last one and this
gave the ok (3 lights)
When I pushed the testing device in the right hand socket it went bang
before even switching it on.
But after resetting the consumer unit the other sockets where still good
and left hand side socket was still good.

Any ideas, gents?

Thanks.


My guess would be that the socket tester is a red herring and any
plug inserted into the RH socket, or even pressure applied to the
RHS of the plate shorted your wiring perhaps to the metal
back-box.
If it went bang as you said, aren't their any sooty deposits to
show where the failure was?
--

Graham.
%Profound_observation%