chris French wrote:

I'm thinking that maybe my RCD isn't doing it's job properly? (We have a
TT earth system with just one main incoming RCD - about as old looking
as the CU) The test button works ok though.

Are you sure it is a RCD and not an older "voltage operated" ELCB?

There is a picture of a common one he
http://wiki.diyfaq.org.uk/index.php?title=RCD#ELCB

There are also details of how to test the RCD, if it is a RCD.


--
Cheers,

John.

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