How to Wire Deep Well Pumps


A deep well's pump typically pulls water from a 50 to 300-feet deep hole. The pump often hangs about 10 feet off of the bottom of the well. The wires from the pump motor, a circuit breaker and the well's pressure switch enter a control box. When the water pressure in the well's holding tank drops below a preset level, the pressure switch activates the control box. The control box turns on the pump motor through its start circuit. Once the deep-well pump motor attains operating speed, the control box switches to the run circuit.

Things You'll Need

  • Screwdriver set
  • Turn off the deep well's circuit breaker. In most cases a deep well pump's circuit breaker mounts in the main electric service panel, found next to the electric meter, and uses a "Well" identification tag.

  • Open the deep well pump's control box, located next to the water storage tank. Many control boxes use a set screw to hold the lid in place, others have a latch. If the control box uses a set screw, remove the screw with the correct screwdriver and pull the lid from the control box. If the control box uses a latch, depress the latch and swing the control box's cover away from its housing.

  • Inspect and understand the control box's wiring diagram. The wiring diagram will identify each wiring terminal, provides the terminal's function and sometimes lists the pump motor's wire colors. A well pump motor's wires connect to the control box's "Start," "Run," "Common" and "Ground" terminals.

  • Loosen the deep well control box's pump motor wire terminals with the appropriate screwdriver, often a slotted screwdriver. The run, start and common terminals mount to a terminal block. The ground terminal screws into the control box's housing.

  • Wrap the deep well pump's green wire around the ground terminal screw. Snug the screw against the green wire with the screwdriver.

  • Position the deep well pump's red wire in the control box's "Start" terminal. Tighten the "Start" terminal with the screwdriver.

  • Insert the deep well pump's black wire in the control box's "Run" terminal. Secure the "Run" terminal screw against the wire with the screwdriver.

  • Place the deep well pump's yellow wire into the control box's "Common" terminal. Lock the terminal screw against the yellow wire with the screwdriver.

  • Replace the control box's lid before turning on the circuit breaker.

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  • Photo Credit Hemera Technologies/ Images
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