I changed our old fuse box for a split load CU a few months back. We
were
having a problem with the RCD tripping which I put down to a faulty
iron -
replacing the iron seemed to cure the problem. However in the last
week or
so we have had 3 trips at random times, both while the house was
occupied
and unoccupied. Anyone have any tips on tracking down the problem?

The RCD currently covers 3 ring mains - upstairs/downstairs/kitchen -
I
guess one option is to transfer a couple of rings to the unprotected
side
and see if the trips carry on, and if so keep swapping them until
they stop,
which would isolate the problem circuit but still not the precise
problem.

cheers

Dave.


This is the price tag for installing one RCD on all your rings. Next
time you'll know better. The best approach is to put RCBOs on the
rings, and change the RCD isolator switch for a switch only. Whichever
ring trips, ensure the freezer isnt on it.

There had to be a good reason for spending the extra on RCBOs - doh!
The fridge/freezer is not on the RCD side fortunately ;o)

Now with 3 trips it is relatively easy to locate the dud appliance(s)
with no further cost, simply by moving them between rings. Divide and
conquer, move half at a time to narrow things down quickest.

The problem being the trips are random, and might not happen for several
days. It isnt easy to move stuff around and leave them there for days on
end! At the time of tripping these are the likely things plugged in (but not
necessarily in use, probably on standby if available)...

Upstairs
--------
hi-fi
Phone Charger
tv
multi skt extension - video/dvd/pc/lcd monitor/printer/camera charger
alarm clock
lamp

Down
----
lamp
tv
multi skt extension - video/tivo/digibox/dvd

Kitchen
-------
microwave
kettle
gas oven
washing machine


Would I be right in thinking the only culprits (appliance wise) are those
that have an earth connection - so I can disregard all double insulated apps
(which I think is most of them except kitchen apps)?

Alternatively, insulation test or pat test all appliances, including
the fixed ones. Of course it'll cost you.

NT

Hmmm, last resort...