pond fountain gfi tripping

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WIREWILLY

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JACKSONVILLE, FL ST. JOHNS
I've got issues w/a DP gfi breaker nusiance tripping. The (load) motor is on 125 ft. of cable (floating fountain), tied into j-box with appx. 460 ft of #6 cu.,
circuit conductors, 2" pvc (buried). Clock timer, motor cap. box and OC breaker at panel. The DP 30 gfi breaker trips randomly. Motor load is appx. 10.2 amps
@250 volts. The fountain motor is 2hp.,single phase. Can't figure out why gfi breaker trips so infrequently. Definitely not ovr. load. Could it be capacitance
issue. Fountain company meg'd the ckt. and thinks the conductor insul. is the problem of which we've already replaced. Any thoughts and help?
 
The instructions provided with some GFCI devices say not to use more than 250' of wire on the load side. All insulation has some leakage and the total current leakage is a function of the length of the conductors.
What type of insulation is being used on the conductors? XHHW has less leakage than the more common THWN.
 
WIREWILLY said:
The insulation type is THHN. The gfci breaker is part of the time clock enclosure. I changed the gfci breaker thinking it might be a bad breaker from the
factory, but still trips.
Click to expand...
99.9 percent of the time it is not the gfci if it is tripping. I agree with Don -- move the gfci closer to the load.
 
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