On 06/11/2010 15:46, Dave Osborne wrote:

Yes, you should definitely suspect the RCD.

I've never known an RCD fail by becoming over-sensitive. I've known a
few though that have become insensitive and failed to trip when they
should. The test button is there for a purpose...

For this case a N-E short or leakage, which could be in an appliance or
in the fixed wiring, is no. 1 suspect, as others have said. I'd put the
RCD itself a long way down the list.

--
Andy