You could put in the transfer switch that comes with the generator and
connect it up as normal for one of the feeds, then add a slave transfer
relay that would operate with the following two conditions:
1) Mains voltage of second feed is zero.
2) Voltage out of the generator is not zero.
Feed the slave from the input of the generac transfer switch.
It would take some additional puzzling to figure out how to force the
generator to run when the second feed only is down. I am sure it can be
done.
You could have a relay between the meter and the transfer switch of feed 1
that would cut feed 1 if feed 2 died. That would force everything to start
and run. Cheap and dirty. Inefficient but it would work. I am sure there
is a better way.
-----Original Message-----
From: George Skorup (Cyber Broadcasting) via Af
Sent: Sunday, October 26, 2014 3:17 PM
To: Animal Farm
Subject: [AFMUG] Generator question
So I have a unique situation at our office. We're looking at a Generac
QuietSource 22 or 30kW running on NG. I'm not dead set on that, but
those are very nice and quiet 1800RPM. And the problem is, our building
is really old and is split in half with two separate 240 services coming
in. And I do have an old empty 1-1/4" conduit between the two utility
closets. The two services is actually nice because a lot of times, one
side will have power when the other doesn't. One comes from the north,
the other from the south.
There's no way we can rewire and combine everything into one service
feed. I'm trying to wrap my mind around how to do something like two
auto-transfer switches on one generator. I have critical stuff to run on
both sides. Probably need a qualified electrician or engineer, but I
thought I'd ask here for suggestions before we go down that road and pay
someone to come up with something that I most likely wouldn't like.
