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Posted by Pop on July 31, 2005, 1:58 pm
I think this site might help you out in some of your
decisions:
http://www.nbmc.com/emergen/index.html
Offhand it sounds OK but it's fuzzy in a couple of
areas (to me). The single most important thing is to
not allow the generator, under any normal "fault'
conditions, to feed the power lines.
A Transfer Switch panel is the easiest way to do it,
IMO, and the most reliable. Lots of companies make
them. Yours almost, not quite sounds like a transfer
switch, so I'm not making too many judgements on the
validity of your plans here.
HTH
Pop
"Tman" <tman9_ at _comcast.net (remove underscores)>
wrote in message
> Going to install a generator tranfer sub-panel.. I'm
> getting a permit, but I wonder if there is anything
> obvious here that I plan on doing that would be amiss
> before i get that permit....
>
> I have a 8-place Square D subpanel with a 70A switch
> and a 30A breaker wired with one of those mechanical
> interlocks that prevent both from being on at the
> same time.
>
> So I'll run the 30A breaker via 10/4 romex to an
> outside plug, which is where I'll connect my approx
> 5500W portable generator.
>
> Then I'll run the 70A switch (2 hots) and a neutral
> via some 6ga wire in a conduit to a 60A 2-pole
> breaker in my main panel. Including a 8ga ground in
> the same conduit, being sure that the ground and
> neutral are not tied together in the sub-panel.
>
> Then I'll load the remaining 4 spots in the subpanel
> up with the QOT tandem breakers. One of these is for
> a 240 circuit (water pump), and i'll tie two adjacent
> breakers together with a tie pin from Square D to
> make a 2-pole breaker. This leaves 6 circuits for
> 120V service.
>
> Two things I want to make sure about:
>
> If I add all the breakers in the subpanel up, I'll
> have 70A (2x20, 2x15) per leg, which exceeds the 60A
> subpanel feed breaker and certainly the 30A generator
> feed breaker, and even more so, the 5500W generator
> capacity. But I don't think the feed breaker will
> ever trip, and I'll just have to be careful when on
> genny. Is there anything not kosher about this
> setup?
>
> I need to transfer a handful of circuits from the
> main panel to the sub panel. Can I do this the easy
> way.. by leaving each circuit run in the main panel,
> and splicing the hots ONLY with a wire nut to feed to
> the subpanel via wire of the appropriate guage in a
> conduit? Anything to be aware of here, especially if
> it is OK to leave the ground and neutrual for these
> transferred circuits terminated in the main panel? I
> could run those to, but not if I don't need to...
>
>
> Thanks!!
> Tman.
>
>
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