On Thu, 25 Jun 2009 00:04:55 -0700 (PDT), Bear wrote:

When it trips, only the electrical sockets in the house are knocked out.

You use the abbriviation "RCB", I'm not sure what you *exactly* mean
by that. A consumer unit can contain three different types of breaker
(excluding the main switch...).

Minature Circuit Breakers (MCB) for each individual circuit (socket
rings, lights, cookers etc), this provides overload protection only.
This just has a toggle to reset it.

Resdiual Current Device (RCD) which monitors the live ane neutral
wires and trips whne there is more than the specified current going
than is coming back. No overload protection just dection of "earth
leakage". This will have a "test" button and toggle to reset.

Residual Current Breaker Oveload (RCBO) these combine the function of
an MCB and RCD into a single unit and provides both earth leakage and
overload protection to the circuit passing through it. Again test
button and reset toggle.

We need to know exactly what type of device is tripping.

--
Cheers
Dave.