I always megger phase to phase at the feeder breakers (after termination) just as a triple check to make sure that someone did not swap phases on parallel runs.

However, I'm told that you cannot do this on transformers because you can't send voltage through the windings. Would I be able to use a continuity tester between phases? In otherwords, lets say instead of AA,BB,CC the terminator was daydreaming and you had AB,AB,CC.
I would think you would read continuity between A lug and B lug. Or would you read continuity anyway due to the transformer windings. since I cant use a megger, is the continuity test a valid one to check for swaped phases?

I'm just looking for a quick check which would prevent a massive explosion.