How to Wire a Well Pump's Pressure Switches

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Homes that have a private well as a water supply require pumps, pressure tanks and pressure control switch. The pressure control switch monitors the water pressure in the pipes and activates the pump when the pressure drops below the "cut in" pressure. It then shuts the pump off when the water pressure raises above the "cut out" pressure. Wiring such a device requires connecting the power supply from the distribution panel and the pump's electrical leads to its terminals.

Things You'll Need

  • Non-contact voltage detector
  • Wrench
  • Wire strippers
  • Screwdriver
  • Turn the power off for the circuit you are working on at the building's electrical distribution panel. Confirm the power is off by touching a non-contact voltage detector to the wire's insulation.

  • Loosen the bolt that secures the cover on the pressure control switch. Remove the cover and set aside.

  • Feed the power wire from the distribution panel through the side access hole of the pressure switch and pull in the amount of wire necessary to make the connections. Secure the wire to the switch box by tightening the compression mechanism with a screwdriver. Bring the pump's power wire in through the other side of the pressure switch and secure with the compression mechanism in the same manner.

  • Strip 3/8 inches of insulation off all of the conductors for each wire with wire strippers. Loosen the pressure switch's electrical terminals with a screwdriver.

  • Insert the black hot wire from the distribution panel in the source "+" terminal and tighten it down. Insert the white neutral wire from the distribution panel in the source "-" terminal and tighten it down.

  • Insert the black hot wire from the pump in the pump "+" terminal and tighten it down. Insert the white neutral wire from the pump in the pump "-" terminal and tighten it down.

  • Insert both green or bare wires in the ground terminal and tighten it down. Reinstall the cover on the pressure control switch.

Tips & Warnings

  • Working around electricity is inherently dangerous because it only takes a small amount to stop your heart. Always turn the power off before beginning any work.

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References

  • Photo Credit Thinkstock/Comstock/Getty Images
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