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re: Ballast grounding & GFIs

> The GFI will NOT protect you under the following conditions(just a
> sample):
>         -Contacting both the 'line' and 'neutral' conductors.
>         -Contacting the output of a ballast or transformer (since they
> isolate)
This sounds good but I don't think it can be good.  Once when I
was troubleshooting a homebuilt florescent light hood that used
an IceCap ballast I came in contact with the wrong parts of the
bulb end.  I was miles from the current ballast, and contacted
only its output I am positive.

The sensation was not pleasant, but there were three GFCI
units in series between me and the main circuit breaker.  All
three of them blew.  I was fortunately not injured.

I don't understand how GFCI's work, but I won't touch a circuit
that doesn't include one.  And there probably ARE some
conditions under which they won't protect me.  But I still
don't know what they are.