Posted by NEsota on May 23, 2013 at 13:54:56 from (173.198.158.95):
My project entails a 500 foot, 240 volt underground circuit from the meter pole to a pump well pit five feet deep. The 1 h.p. jet pump will have 15 feet head pressure applied and will run on demand to water cattle. Estimated continuous pump time would rarely exceed one hour. There is a ground at the meter pole and I plan to have one at the pump end also. We have not purchased wire nor supply end circuit breakers yet (pump motor has thermal protection). This amateur would appreciate your help and comments on any plus to using 4 conductor wire for the run and letting the center tap float. The rural power comes down the meter pole, inside conduit and through the meter and out the bottom to the main switch box (I don"t think this that is a overload circuit breaker), then back up the pole inside another conduit and spans to the house and a 100 amp circuit breaker box inside. I would like to put the circuit breakers for the pump inside the switch box with the main breaker and then out the bottom of it and go underground. Motor specifications call for GFCI. Have done this with 120v but not with with 240v. Thanks for your help in selecting wire size and other specs. I will follow up on any on-line links to other information or charts
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