ECN Forum Forums General Topics of the Trade General Discussion Area back up generators

There are 2 issues with swapping a wye for a delta. One is that delta is 240 between legs and wye is 208. The second issue is the high leg.

You could go with a 480 3 phase generator feeding a 480/240 wye delta transformer. Power up the genny off of the gas main if available, propane and tank, or diesel and tank.

I don't know if you can get a delta high leg in a single unit. If you can't, feed the 120 V loads from a single phase 240/120 transformer.

Larry

edit because I still don't have UBB down.

[This message has been edited by LarryC (edited 10-05-2006).]

the generators are gas. I assume all the equipment will work fine off the 208 voltage. so if there is a transfer switch and there are no 240 1 pole loads what would it be the problem with backing up a 3phase delta panel with a 3phase wye generator

I don't think that might be a valid assumption.