Galvanic Isolator tripping new dock power pedestal

This is a message I received from Bruce at ProMariner. Based on this he recommended replace the GI with a new model that doesn't have the diodes and doesn't require monitoring.

The older galvanic isolators needed to be monitored because the diodes inside could blow “open” and interrupt the AC safety ground. This could cause a dangerous condition on the boat if there were a short somewhere.

The monitor system sends a small pulse down the ground line and reads the pulse back on the “neutral” line since they are connected at the shore-side breaker box.

Most boats have a small amount of signal leakage onto the ground line. Combined with the “pulse” from the monitor this can be enough to trip some GFCI’s.

New galvanic isolators do not need to be monitored since they have newer technology where the diodes cannot blow open and interrupt the ground line. Switching to the new style isolators is the only permanent solution to this tripping of the GFCI’s.