I have a Square D 75T3H 75 KVA dry-type transformer connected 480V Delta to 120/208 wye. I need to supply some single-phase load at 208 Volts by connecting to only two of the secondary 208 volt terminals. I will not be connecting to the third secondary terminal. There is no 3 phase load connected to the transformer. How much single phase 208 volt load can I safely feed without severely overheating and unbalancing the transformer? My first inclination is to say 50 KVA, but I'm just not sure nor do I know how to calculate the answer. Please help. Thanks.