. . and, in the UK, a neutral to earth short will trip the RCCB - well in my house it does.
Bl00dy nuisance that
And it should! If you have a neutral<>earth short, then some of the current that should be in the neutral line will flow in the earth, which the RCCB will interpret as a fault (since the current flow in the live<>neutral will no longer balance). It's just doing its job.
-GY