Over the past few years, several feeder breakers have tripped. In all but one case, the cause was traced to a branch circuit condition, but the branch circuit breaker did not trip.
After the first two incidents, a breaker coordination study was conducted and a few changes were made. Yet, the problem recurred. Management’s response was to:
- Consult each breaker manufacturer about the recommended lubricant for their breaker.
- Evaluate and improve breaker mai