RE: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet

> Because GFCI is intended primarily to protect against short-circuits

within hand-

> held devices. It was never intended, and is not recommended, for properly
> grounded appliances and equipment. If you feel more comfortable putting
> everything on GFCI sockets or breakers, go for it.
> It's just not necessary, and is prone to cause spurious faults just as Don

has

> described.

Newer versions (with AFCI) also trip if loose connections are arcing -
grounding won't stop a fire caused by that. In this case perhaps the
brushes aren't seating properly.

I've seen a few cases of this happening. One was an old powerboard where
the contacts on one socket were a bit loose, I threw that out. Another was
a microwave oven with a blown bulb. The bulb was actually fine, it just
wasn't making contact properly in the socket. A bit of head scratching
occurred while trying to figure out why the breaker kept tripping.

Tony