I've got a 3-phase 225 KVA transformer (480-208/120) that's running pretty hot. I think it's overloaded, but want to make sure. I've taken load readings on each phase conductor at the 208/120 panel with an ammeter. They were 142 amps on phase A, 160 amps on phase B, and 135 amps on phase C. How do I determine the overall amp draw and thus the actual KVA? Thanks in advance.