Two ATFs, One can select between the two service lines to a common feed to both sides of the building, then the second would transfer between the output of that switch and the genset. Easy to do if you have room in conduit, and assuming either services can feed the entire site load.
Marco On Sun, Oct 26, 2014 at 5:27 PM, George Skorup (Cyber Broadcasting) via Af < [email protected]> wrote: > Exactly my thought, which is why I brought this up. So maybe a master > switch feeding two sub switches? But I need either or both sides to be able > to tell the generator "I need power." > > > On 10/26/2014 5:11 PM, Chuck McCown via Af wrote: > >> Those generacs have lots of interconnections between the transfer switch >> and the generator. They may be able to do a two wire start, but I would >> not count on it. I have installed lots of them and it seems like there is >> about 8 control wire. >> >> -----Original Message----- From: Seth Mattinen via Af >> Sent: Sunday, October 26, 2014 4:06 PM >> To: [email protected] >> Subject: Re: [AFMUG] Generator question >> >> On 10/26/14, 14:17, George Skorup (Cyber Broadcasting) via Af wrote: >> >>> 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. >>> >> >> >> >> Feed a panelboard that subfeeds multiple transfer switches. Use switches >> that are two wire start signal and a generator that accepts a two wire >> start signal. Parallel the start connections. They'll switch >> independently. Pretty common and straightforward thing. I'm feeding >> three on a bus. If any one of the three want to go to emergency it will >> and the other two will do whatever they think is right, too. Don't do >> anything dumb like trying to come up with logic that depends on the >> others. >> >> ~Seth >> > > -- Marco C. Coelho Argon Technologies Inc. POB 875 Greenville, TX 75403-0875 903-455-5036
