Thanks for the input.
Fortunately, the original manufacurer has the drawings for this sub-station. They are looking into a retrofit package to get us to 480V and the other improvements needed to bring this up to currect specs. The tap is correct @ 87.7% and they say it is true 3 phase, but...
We have an existing 150kVA Dual Grid 2.4kV, 2 Phase 3 Wire primary service with Scott connected transformers for a 208/120V 3 Phase 4 Wire secondary in a building that is about to be retrofit into an automated parking garage. We must have 480V, 3 Phase, 4 Wire power.
The original manufacturer...
