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How do C440 protections work for Phase Imbalance?

C440 will protect for Phase Imbalance using both the Phase Loss protection as well as the Ground Fault protection. Even if Phase Loss is turned off, he Ground Fault code will also initiate a trip if a phase imbalance is present. The difference between the two is the time to trip during a phase imbalance:
• Ground Fault Code --- Will initiate a trip as fast as 1 second depending on the amount of imbalance.
• Phase Loss Code --- Will initiate a trip after 10 seconds if the imbalance is 50% or greater between phases.

To prove tripping is a phase imbalance issue --- turn OFF ground fault and turn ON phase loss.
If it trips there is a phase imbalance issue.