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#3
02-15-2014, 07:51 PM
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From what I have researched is: that a grounding probe used along side a gfi provides the fastest or most direct route to shutting down power supplies, going gfi alone is also ok but not as direct/fast, and running a probe without gfi or no probe/gfi combo is basically allowing enough time to be seriously injured or worse!
Please feel free to correct me if I'm wrong 
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cheers, Rich all that we do is touched with ocean, yet we remain on the shore of what we know http://www.advancedaquarist.com/2005/5/aquarium Last edited by sumpfinfishe; 02-15-2014 at 07:55 PM. Reason: added something 
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#4
02-15-2014, 08:03 PM
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way a GFI works is it simply compares the current between the hot lead and the neutral and trips if there's an imbalance.
Throw a heater with a crack in the insulation (cord or housing) into a tank without a ground probe, basically the current in is the same as the current out. Now say you're grounded (touching a light fixture) and put your hand in the tank, there's an alternate path to ground, the imbalance detected and the GFIC trips. Put in a ground probe, the alternate ground path already exists if something was to fail. Either case trip time of the device the same once the imbalance detected, just might go undetected until you put your hand in.
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my tank Last edited by mark; 02-15-2014 at 08:09 PM. Reason: changed to heater from pump as typically heater ungrounded
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Hybrid Mode
