Quote:
Originally Posted by ledhedsymbols
Look at the circuit running out to the water feature. If the pump doesn't trip a different GFCI circuit then I think something is wrong with your pump circuit.
The GFCI looks for an imbalance between your hot and the returned current on the neutral. They are very sensitive by design and trip on something like 4-6 ma.
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^^This^^
Is the circuit to the pump a dedicated circuit with only the pump outlet at the terminus or are there other outlets/junctions along the path? If there are other exposures along the circuit, any one of them could be a contributing factor to an imbalance, once the pump is connected. A minor "leakage" from the neutral to ground anywhere on the circuit path would make the breaker more sensitive to any imbalance produced by the pump, causing the breaker to trip. It doesn't take much as, noted above, the imbalance necessary is only ~6mA.