US 240v - No neutral means no chance of diff between legs?

Am I thinking correctly that if there is no neutral (E.G., for AC compressor that’s tripping breakers) that there is zero reason to stick a CT on each leg? Or is there a possibility that there could be something to be learned from having a CT on each leg?

The current is exactly the same. The only reason they could be different would be a ground fault in you equipment.

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