How to Wire a 110-Volt Intermatic Pool Pump Timer


Intermatic manufactures a time switch, model T101, that limits a 110-volt pool pump motor's run time. The Intermatic model T101, a single-pole single-throw (SPST) switch, uses a dial timer with trippers. The trippers flip the timer's switch on and off. The 110-volt electrical circuit feeding power to the pool pump contains one hot and one neutral leg. An SPST switch operates one leg, and most local building codes require switching the hot leg in a 110-volt circuit.

Things You'll Need

  • Wire strippers
  • Slotted screwdriver
  • Disconnect the electricity to the 110-volt Intermatic timer at the circuit breaker. The correct circuit breaker, often mounted in the main panel box next to the electric meter, should have a "Pool" identification tag.

  • Strip 1/2 inch of the insulation from the end of each wire entering the Intermatic timer with wire strippers. The wire sets, one from the circuit breaker and one going to the pool pump's motor, both contain two color-coded insulated wires and an additional wire without insulation.

  • Loosen the 110-volt Intermatic timer's four terminal screws with a slotted screwdriver. Notice the identification tags above each wire terminal -- "GND," "A," "1" and "2." The "GND" terminal mounts to the Intermatic 110-volt timer next to the dial on the dial's mounting plate and it uses a green screw. The remaining terminals mount to the Intermatic timer below the dial's mounting plate.

  • Route both uninsulated wires around the perimeter of the Intermatic timer to the terminal with the "GND" tag. Keep the wires away from the terminals mounted below the dial. Bend the wire around the "GND" screw. Tighten the screw.

  • Slip the end of both neutral wires under the pressure plate on the 110-volt Intermatic's "A" terminal. Tighten the screw. A 110-volt circuit usually uses the wires with a white coating as neutral. The screw tightens against the pressure plate, which holds the wires against the wire terminal.

  • Slip the end of the hot wire from the circuit breaker under the pressure plate on the Intermatic's "1" terminal. Tighten the screw. A 110-volt circuit usually uses the wire with a black coating as hot.

  • Slip the end of the pump motor's hot wire, the remaining wire, under the pressure plate on the Intermatic's "2" terminal. Tighten the screw.

Tips & Warnings

  • The pump motor and timer will still work if the timer switches the neutral leg; however, the pump motor will remain hot at all times.

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