In this discussion do not forget that in certain power grids a protection in case of an isolation fault can only be realized by means of an RCD because the loop impedance is to high. In typical TT-systems (France, Belgium for instance) earth leakage even in case of a full short to earth is that weak that a fuse will never trip.
That's why in France RCD's are usually integrated in the mains switch delivered by the PoCo.
So the RCD discussion is not the same for everybody.
[This message has been edited by Wolfgang (edited 09-28-2005).]
