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How to Wire the Red, White and Black Wires In a 115 Volt AC Motor

Updated February 21, 2017

A two speed AC motor usually has a red, black and white wire. This type of motor is equipped with a low speed coil and a high speed coil. The red wire connects to one side of the low speed coil and the black wire connects to one side of the high speed coil. The other side of the low speed and high speed coil are connected together to the white wire. If power is applied to the red and white wires, then the motor would operate at low speed. If power is applied to the black and white wires, then the motor would run at high speed.

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Strip 1/2-inch of insulation off of both wires at the non-plug end of the electrical cord. A polarised plug has a large prong and a small prong that will plug into an electrical socket only one way. Locate the wire that is connected to the small prong to the white wire of the motor.

Connect the wire that is connected to the large prong to the centre screw terminal of the single pole double throw switch. Connect the black wire of the motor to the left terminal of the single pole double throw switch. Then connect the red wire to the right terminal of the single pole double throw switch.

Plug in the electrical cord and flip the single pole double throw switch to the right. The motor should run at low speed. If you flip the switch to the left, it should run at high speed.

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Things You'll Need

  • 2 speed 115-Volt AC motor
  • Single pole double throw switch
  • Wire cutters
  • Wire strippers
  • Polarised electrical cord

About the Author

William Kinsey lives in Concord, N.C. He started writing articles in March 2009, which have appeared on Autos.com and CarsDirect.com. He currently holds a Bachelor of Science in electrical engineering from the University of North Carolina at Charlotte and a Master of Business Administration from the University of Phoenix. He also has several years experience as an outside plant engineer and planner with AT&T. He also currently owns and operates Sophisticated Curves, an online fashion mall that caters to the needs of plus size women.

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