Shujinko
Senior Member
I have a project in a classroom where, at a teacher's podium/lectern, there is a floorbox with receptacles. The branch circuit for these is protected by a 20A/1P GFCI circuit breaker. The podium/lectern has some sound system equipment in it that plugs into the floor box. The GFCI breaker keeps tripping for some reason. I have inspected the installation of the floor box, panelboard, and GFCI circuit breaker with the contractor and have not found anything out of the ordinary.
Therefore my theory is that the electronics of the sound system equipment is creating enough harmonic current to trip the GFCI circuit. I am assuming that the 5mA sensor on the GFCI breaker is sensing that the current difference between hot and the neutral is greater than 5mA and is tripping the breaker.
Would this be a good analysis or am I missing something else I should be looking at? Has anyone else run into this situation?
Therefore my theory is that the electronics of the sound system equipment is creating enough harmonic current to trip the GFCI circuit. I am assuming that the 5mA sensor on the GFCI breaker is sensing that the current difference between hot and the neutral is greater than 5mA and is tripping the breaker.
Would this be a good analysis or am I missing something else I should be looking at? Has anyone else run into this situation?