thanks scott, good information.

I was also wondering what would happen if you energized a transformer with swaped phases on parallel runs.

Would would something blow up or is there protection for this built in.

I know that OCPD's protect against shorts (phase to phase) and its supposed to clear maximum short ckt without causing extensive damage. Do you think the feeder breaker would trip (if properly sized per nec) or would you have a bomb? Assuming no load on it.