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My husband is trying to wire a new pressure switch for our well. It is located under our home. Can you explain how to rewire it. There are 2 black wires and 2 white wires. We need to know which is the load and which is the line.

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The pressure switch is marked for LINE and LOAD.
Line wires come from your power supply to the switch.
Load wires come from the switch to the well pump.
Most likely the black AND WHITE wire from the power supply go to the 2 center terminals on the switch.
The black AND WHITE wire from the well go to the 2 outside terminals on the switch.

Posted on Aug 28, 2010

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