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I installed a 1/2 hp 5.9 amp pump in a new well. Is 12/3 wire okay for the pump. The will is 245ft deep and its 265ft to the breaker box?
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rman, I think I can give you a handy tool for your reference in the future. Check this out http://www.mikeholt.com/volt_drop.html
*510 feet of 12 gauge has a resistence of 0.826 ohms or 1.65 for the loop. At 5.9 amps, that means a voltage drop of 9.7 volts - too much if it is a 120-volt circuit, okay if it is 220-volts. If 120-volt, 10-gauge is okay, but not great. 8-gauge would be the preferred installation but getting pricey. Of course, hauling a fired pump up (with all that piping) is a bit of time and money too.Note that I used guidelines for average motors. Most pumps come with little charts for distance versus wire gauge. If you didn't get one, call up Grundfos, Franklin, or whoever. Follow the manufacturer's recommendations. -David
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I installed a 1/2 hp 5.9 amp pump in a new well. Is 12/3 wire okay for the pump. The will is 245ft deep and its 265ft to the breaker box?