Peter van Hoof wrote:
> There are three different ways they are applied. The most common being
> built in an outlet (sometimes looped to additional outlets that are
> also protected). There are devices such as a hairdrier that have them
> built in the plug and finally the least common the housewide systems
> where the main line coming into the house has one built in that
> provides protection to the whole house.

A fourth and fairly common scheme here is GFI circuit breakers for
individual circuits.  These fit in place like ordinary circuit breaker but
cost somewhat more and trip on a ground fault in addition to excess current.
I've used them on some new circuits I installed in the basement.


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