08-19-2009, 08:07 PM
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A GFCI monitors the amount of current going from the hot and neutral wires. Ideally, all of the electrical current going into your pump, space heater, tv, whatever will pass between the hot and neutral wire. If everything is going as it should, the current will flow from the hot, through your pump, then into the neutral wire...the amount of current being pretty much exactly the same. Now, if someone is getting shocked, the current will flow from hot, into your pump, but now a little will also go into you and to the ground, and the rest will go to the neutral wire...so, there's a slight imbalance of current coming out of the hot wire and into the neutral...pop...your GFCI will open the circuit saving you and your fishies life.
GFCI's are very sensitive (they can detect a current different that's only 6/1000 of what a 60W light bulb uses), so, if there's something causing an incredibly slight imbalance or "noisy spike" between the the two currents, you can get a "false trip"...or your GFCI could be bad....or you could have a problem somewhere.
What do you have connected to this GFCI?
Last edited by nomel; 08-19-2009 at 08:27 PM..