We have 2000kft of 750 MCM (UG conductor) and 6000kft of 556 AL. It's a 3 phase, wye connected regulator set at a base of 114/110. Currently it's set to X=0, R=2 with a ct ratio of 400/.2 and pt of 120/1. It runs at 13.2kV. It's a 750/937 KVA SFR reg. After all was said and done, I calculted...