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What is the difference between a 2-wire and 3-wire submersible pump motor?

Answer: 

- In a 2-wire pump, the relay and start capacitor is located IN the pump itself and the pump is in the well.

- In a 3-wire pump, the relay and start capacitor is NOT in the pump but inside a Control Box (Usually located in your basement). The pump, of course, is still in the well. Technically speaking, your pump capacitor needs electricity to start.