Single or multiple transfer switches

[wwhitney]

I am thinking #2 for this application.

I agree that #2 seems simplest. You might want to lay things out to make changing to #3 easy in the future in case something arises that we've overlooked.

Cheers, Wayne

 

[hillbilly1]

If it is a diesel, you want maximum load anyway to prevent wet stacking. Control of A can be done with phase loss relays in B and C, and A would already have its own control in the switch.

 

[electrofelon]

I didn't think (correct me if I am wrong) you can power a panel in building B by a feeder from building A if building B has a service.

I think I addressed this in post #29

 

[ggunn]

A plausible prohibition, but one I don't find in the NEC. Do you have a reference?

Cheers, Wayne

No, sorry; I might be guilty of assuming the NEC would follow common sense.

I would expect that at least the feeder would have to have an external disco on the outside of building B next to the service disco so that firefighters could completely shut off the power to the building. e'felon may have addresed this as well.