Ground fault protection that works on one source can fail when a generator or a tie breaker changes how the system is grounded. We specialize in systems with multiple power sources, and we test the whole scheme, not just each device on its own.

We also chase nuisance tripping, the breakers that open when nothing is wrong. Insulation resistance testing and verification of each protective device show whether the protection is sound or just touchy.

Typical reasons people call

A ground fault breaker keeps tripping with no obvious cause.
The site has a generator, a tie breaker or more than one utility feed.
Protection was never tested after the system was changed.