Never use pipes for safety grounding. Safety grounds connect to
pipes only to 'remove' electricity. Never dump electricity into pipes -
a serious safety hazard.

Rob wrote:

Hi, I just had an electrical inspection done by Ontario Hydro, forced on me
by my insurance company. This was on a house that I just bought that was
converted into a triplex sharing the same hydro meter. Some of the wiring is
older two wire with no ground, but using three pin outlets. His advice was
to either block the ground hole with epoxy to make it two pin, or to use
GCFI's where a ground was needed, or run a ground cable to one of the water
pipes. This put the wiring within code and also acts as a safe or safer
circuit as any shorts to ground are picked up quicker than conventional
wiring using the ground to blow the fuse or breaker.
Unless you can get to a copper water pipe, the GCFI will more than meet
your needs.