Mogga wrote:
On Sun, 25 Nov 2007 15:11:48 GMT, Mano wrote:

OK open to ideas here with this one :-

we have a mcb style mains board (crabtree from memory) which has an RCD
device built in. Normally when when for an example a bulb goes the trip
for that lighting circuit goes bit of a pain but we can live with it.
However yesterday and today has been a nightmare with the main breaker
tripping on average every two hours! No individual circuit goes and
throwing the break brings everything back to normal (apart from having
to reset the times on the cooker microwave stero etc!).

At a loss for any ideas. Nothing has changed regarding load no new
devices etc and its happened day and night so its not something we are
manually turning on or off.

any ideas where to start ?


Have you got a dishwasher? Ours had something go wrong with it
recently and three times had tripped the main RCD - leaving a smell of
"burnt" in the kitchen briefly.
We'd suspected it might be dishwasher as it'd been finished but still
on twice so put the garden RCD onto the plug. Third time it went that
RCD had tripped as well as the main house one so BF's dad had a look
(ex-repairman) and spotted the problem. Couple of quid for a new bit a
interference suppression capacitor thats on the mains side of the
switch and so didn't matter if the dishwasher was on or off (as it was
the last time) as it had arced across.


Computers and related equipment can cause problems. UPSs as well. Have
you recently got a new PC?

Peter Scott