In article .com,
wrote:
You can purchase an inexpensive plug-in wiring checker at most hardware
or electrical supply stores that will verify if your outlet is wired and
grounded properly.

They only do a rough check. You need an earth loop impedance tester to do
the job properly, and they aren't cheap.

--
*The first rule of holes: If you are in one, stop digging!

Dave Plowman London SW
To e-mail, change noise into sound.