On Mon, 19 Apr 2010 10:02:51 -0700 (PDT), NT
wrote:


Almost certanly an RCD trip then, not MCB. Really you need to properly
fault find on it, but if you really cant then a couple things can be
tried:
1. clean away carbon deposits on and aroud the motor very thoroughly

As I mentioned previously, that was what 'cured' my first RCD trip
although it may not have been 100% the cause (see below).

2. swap L & N wires in the plug.

My second (some months later) was a partial short from the motor
windings to earth and it would trip the RCD by just plugging it in and
not even turning it on at the wall (and yes my sockets are wired
correctly). ;-)

Cheers, T i m