I have an 800 amp Circuit Breaker tripping in the building that I operate and maintain. The equipment supplied by this breaker are 4 rooftop ac units 1 passenger elevator and a transformer that feeds some 120/208v panels. The 800 amp circuit breaker is 480 volts. This circuit breaker doesn't trip all the time though. Only when the weather has been really bad though for the most part. Sometimes all 3 indicators are popped out when it trips (Overload, Short Circuit, and Ground Fault). I am still waiting on getting a megger to Meg out equipment circuits. Does anyone have a suggestion in the meantime?