Yes that's right Paul. An isolation transformer is another whole ball game.
Just like a generator is.
Another place where you would bond neutral and ground is if the out building
is fed directly from the meter, which may be located at building number 1 or
elsewhere. If the outbuilding is fed directly from the meter BEFORE the main
breaker on building number one, then it is considered a separate system just
like being fed from the pole transformer. But if your outbuilding feed comes
off the bottom of the breaker in your main panel then you need the 4 wires
to the outbuilding.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Paul Christensen
> Sent: Tuesday, April 05, 2011 7:59 AM
> To: amps@contesting.com
> Subject: Re: [Amps] 4 wire 240VAC service? What to do now?
>
> > Being that it is only 120 volts you have a hot, neutral and a ground
> wire
> > run out there. You should have the ground wire from the main panel
> > connected
> > to the ground buss in the sub panel along with the local ground rod
> out
> > there. Do not bond the neutral to the sub panel ground.
>
> I realize this is drifting OT but I had a situation several years ago
> where
> an isolation transformer was used at a remote building. In that case, I
> believe the NEC addresses the distribution as a separately derived
> system
> and as an exception to the general rule, neutral would bond with ground
> in
> the remote building's panel. I don't recall is ground must be pulled
> from
> the main building in such a system if there's no direct conductor path
> across the transformer.
>
> Paul, W9AC
>
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