----- Original Message -----
From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
<snip>
> "Ground fault"
> circuit breakers check for current in the ground line and trip if more
> than a few mA are found.

Actually, "ground fault" circuit breakers are designed to detect any current
flowing from the hot that does not return on the neutral. They use a
differential sensor to do this (counterwound coils, IIRC). This causes them
to trip when current runs thru either a fault in a device insulation or an
external path (like you) to ground.

Bob Ammerman
RAm Systems

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