On Mon, 16 Jul 2007 03:01:47 -0700,
mused:

On Jul 15, 6:15 pm, The Natural Philosopher wrote:
Dave Plowman (News) wrote:
In article ,
The Natural Philosopher wrote:
Might be the last straw that breaks the camels back..Although things are
better today, the inrush on a roomful of PC and monitior SMPS's was
enough to flip a 30A MCB in my day.

Had to be switched on one at a time..

Rings are designed for domestic use where diversity applies. A roomful of
PCs suggests commercial use and the circuits should be designed for that
purpose.

However the average house is getting more like a commercial operation
every day

(reply to all)

It goes off at night. I left everything unplugged last night even the
fridge.
I think now it's the alarm. I'm thinking of snipping the wires from
the transformer
to the circuit board within the alarm to prove this. Is this wise?

No. All this will do is leave the internal battery to take over which
will eventually discharge, anywhere between 5 minutes and a fair few
hours, and then possibly everything will start ringing\wailing.

Your battery is also probably knackered, hence the sounding of sirens
when power is turned on\off.

I leave the alarm turned off at night.

Makes no difference, it's still using power and is still monitoring
the 24H circuits.

From what you've said so far I'd leave well alone if I were you and
get a 2nd opinion on the problem, from another electrician.
--
Regards,
Stuart.