Did a service call today at a municipal building where a breaker powering some receptacles (copy machine, computer, fax, etc.) trips intermittently...no rhyme or reason ever few days or so. One phase in the subpanel reads a steady 25 amps while the other spikes every 3 to 10 seconds between 15 and 40 amps. The only circuits in the panel are lighting and receptacle loads. Does anyone have a clue as to what might be causing this?
