Am having a hell of a time with nuisance tripping at the moment. It
happens intermittently, and when it does, you can just immediately flip
the breaker back and it works again. So it's very hard to localise.
It's definitely in the kitchen; and I'm fairly sure it happens when the
oven's on; but seems it may be more likely when the microwave's on as well?
When it does trip, it's the main RCD which goes; however sometimes an
individual MCB flips as well. I hadn't particularly noticed which one,
but I this morning I spotted that it was the main ringmain for all
sockets in the house *other*
than the kitchen! (the oven has a
dedicated radial, and the kitchen sockets - including microwave - are on
First question - do the above observations add up at all? The MCB thing
makes no sense to me at all; I wonder if today's observation was just a
one-off oddity today?
The first time this happened I thought (well, assumed, as I'd
experienced this before) the problem was a duff element in the oven and
just ordered a new one; when it arrived though (during which time
there'd been no more trips) I checked the old and new with a multimeter,
found identical resistance across terminals (20 ohms IIRC) and to earth
(open circuit) and decided I'd been wrong, so returned the new element
unused. Now wondering if I was incorrect in doing so. Could there be
undetected earth leakage (which I don't have kit to detect? Could it be
somewhere else in the oven? Or the house wiring? Oven is a built-in one
about 10 years old; main element was replaced about 9 months ago.
Right now I'm really confused - I don't know whether I should be looking
at appliances (which!?) or wiring. I'd happily buy a new bloody oven if
that would definitely solve it, but I am concerned it might not!
Problem's really made worse by being intermittent, and because it seems
to involve appliances we really can't do without.
Any advice on how to proceed most welcome!