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How would you wire a generator 120V 240V 4 prong twist-lock outlet to a 3 wire 1 hp 240V well pump?


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2015-07-15 19:16:51
2015-07-15 19:16:51

First off you must make sure that your generator has overcurrent protect. This comes from article 445 in the NEC. Then size your wires accordingly. Then hook up your 2 hots, neutral, and ground, making sure you use wire that is listed for a wet location. Your pump will need a disconnect along with overcurrent protection.


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Neutral is vitalIf your generator doesn't have a neutral connection, no. (The generator would be rated for 240V only) If you don't have a neutral you will burn up half your 120V applainces. AnswerThe three prong should plug into the 4 prong and work. The fourth prong is to ground the body of the appliance. Three prong may only ground the motor. Instead of 2 power and 1 gound, the box is 2 power, 2 ground. Should still plug in.

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The best thing to do would be to replace the outlet with a four prong outlet. That way you get a separate equipment ground which is required by the newest code. Otherwise you could replace the cord on the dryer with a 3 prong cord, and connect the ground and neutral together in the dryer, but this is no longer recommended.

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Have to have 4 wires from panel so a change of feed is needed. So over a $100 dollars at least

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Explain what you mean by "3-way outlet". I've heard of 3-way switches, but not 3-way outlets. I would guess the person asking the question is asking how to wire a three-prong socket, as opposed to a four-prong socket...

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