Quote:
Originally posted by FL.Joe
Is the wrasse in the sump? I've never used a ground probe, you critical are they?
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My understanding is that a grounding probe will make it more likely (though I guess not ensure) that if there's current in your tank, some of it will be diverted to ground, tripping your GFI.
Usually, if there is current in the tank coming from one of your devices plugged into a GFI, it should trip the GFI. The current will leave the device, but not return through the neutral wire, so the GFI will trip.
There are scenarios, however, in which current may be present in your tank, but also may find its way back to devices on your GFI, never creating an inbalance that trips the GFI. Probably not very likely scenarios, but then safety equipment is not just for the likely scenarios. In this circumstance, a grounding probe should help make it so that some of the current goes to ground, opening your GFI device by creating a current imbalance.