How to Connect Well Pump Wires


A well pump relies on an electrical switch to turn power on and off at prescribed pressure settings. When the water storage tank in the system is filled to its rated capacity, the accumulated pressure is sensed by the switch and the pump is turned off. Conversely, as water is used and the tank pressure drops, the switch energizes the pump and the cycle repeats itself. Connecting well pump wires to the switch after cable installation is a job performed with the proper tools and basic electrical wiring knowledge.

Things You'll Need

  • Adjustable wrench
  • Voltage tester
  • Utility knife
  • Wire strippers
  • Phillips screwdriver
  • Flathead screwdriver
  • Terminal anti-oxidant
  • Turn the electrical power supply to the well pump circuit off at the main panel. Tag or otherwise mark the circuit breaker to alert others of the work being done.

  • Remove the cover nut from the well pump switch by turning it counter-clockwise with an adjustable wrench. The nut is located at the top of the cover.

  • Test the power supply wires from the main panel with a voltage tester to verify that no power exists. Touch one probe of the tester to the tip of the black or white wires and the other probe to the bare copper ground wire.

  • Pull the cable from the main panel power supply through the wire clamp of the switch box. Cut four inches of sheathing from the cable with a utility knife.

  • Pull the well pump cable through the wire clamp of the switch box and remove four inches of sheathing with the utility knife.

  • Strip 3/4 inches of insulation from the pump and power supply wires using wire strippers.

  • Connect the stripped ends of the well pump wires into the T1 and T2 terminals of the switch bus. Tighten the terminal screws with the appropriate screwdriver.

  • Connect the power supply wires from the main panel to the L1 and L2 terminals of the well pump switch bus. Tighten the terminal screws with a screwdriver.

  • Connect each of the bare copper ground wires to the two green ground screw posts on the frame of the switch box.

  • Apply terminal anti-oxidant compound directly from the tube dispenser to the terminal bus connections to prevent corrosion. Be sure to completely cover the head of each terminal screw.

  • Tighten the cable clamp screws using a screwdriver. Be sure that only the cable sheathing is secured in the clamp and not exposed insulated wiring.

  • Replace the switch cover and tighten the cover nut with the adjustable wrench.

  • Restore power and remove all tags and markings from the main panel.

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