I apologize for any misconception about the installation, the UPS is in building A next to the substation, it will be feeding a transformer in building B the feeder is a Delta connection to the transformer. The transformer is a 480V Delta to 208V/120V Y
The distance of the feeder is 400 feet...
I am working on a UPS project. The ups is being fed by a 480 volt substation in building A and will be the source of critical power in building B. Both buildings have multiple substations fed by 2 ea. 12.4kv feeders.(Double ended subs) The buildings are joined by egress bridges and common hall...