"The Medway Handyman" wrote in message
om...
Hi

Could someone clarify the difference between an RCD & a RCCD or is it just
different terminology?

I'm also a little confused about MCB's. For example;

Regular customer just around the corner to me asked me to look at why her
washing machine causes a 'trip' to operate.

Socket checked out OK (with one of the plug in testers), plug & fuse fine
so obviously a fault with the WM. Advised the customer to get the WM
checked out.

It was the RCCD tripping, not the MCB for the kitchen circuit.

AIUI an RCD/RCCD reacts to current leaking from live to earth and an MCB
reacts to excessive current.

In the case above the RCCD tripped turning off the kitchen circuit but
leaving all the others in the house on.

So, does an RCCD only protect a circuit where there is a high risk - like
a kitchen, or would it trip if any circuit in the house developed a live
to earth fault? And how do you know which circuit its protecting?

There is also a device called an RCBO which combines the features
of an RCD and an MCB.
It is possible to have a consumer unit containing 100% RCBOs
and no MCBs

--
Graham.

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