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Re: NST's ARE ALL DEADLY !!!!!!!!
>I have always switched the neutral and hot using a DPDT relay (contactor).
>This removes all possibility of the AC sneaking around things. Only the
>ground is left intact when the power switch is turned off. This also
>provides safety if the neutral and hot wires are switched as they often
>are. I used to switch the AC line (variac side) into the ground too just
>to be real sure, but occasionally the contactor would switch late blowing
>it up. However, even the ground wire can be hot if there is a wiring
>problem. You could run a small ground rod at the park too just as a
>backup. Best to meter the unknown AC outlets in such locations too just to
>be sure they are wired and operating correctly. Floating neutrals can be
>very dangerous. Be sure to let the park people know about it. You can
>also wire small AC lamps (neon) between the ground and neutral, ground and
>hot, neutral and hot, to make like a little AC line tester on your control
>box. This can be useful if you are constantly plugging it into unknown
>sources.
>
>Glad your OK!! People get killed by such things...
>
>Cheers,
>
> Terry
>
I don't trust relays with my life, never have, never will :) However we did
fix the panel. The emergency off now switches everything but ground.
Chris "Shock Therapy WORKS!" Boden
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