Its interesting this topic came up this week. At work (NASA's Johnson Space
Center) I've been working an issue related to a GFCI circuit on the
International Space Station. Seems ESA (European Space Agency) has built a
GFCI circuit into their UOP (Utility Outlet Panel) which, just like all
other GFCI's, monitors the safety wire for excess current in order to
protect the crew, etc.

Unlike your residential GFCI circuits, the UOPs are for DC, not AC. It
turns out that with some of the EMI filters we put on our loads, you could
get enough significant ringing off the L-C filters to trip the UOP. Yet
another problem that you can run into with GFCI, only in the DC world.

Just thought I'd throw that one out there.

Jason
KB5URQ
(Electrical Power Distribution & Control, NASA-JSC)

"Joel" wrote in message
...
Anyone else have trouble with HF - tripping GFCI in my garage when keying
the mike.