Electrician Training Electrical Certification wiring recessed light fixtures Electrical Wiring Electrical Troubleshooting and Electrical Repairs wire outdoor light fixture Home Electrical Wiring Diagrams
wiring home generator and transfer switch wiring a 220 volt range cord outlet Wiring for GFCI Outlets Wiring Outlets and a Switched Outlet Wiring and Installing Ceiling Fans and Remote Controls wire dimmer switch wiring diagrams for switches wiring a dryer cord and 220 outlet circuit breaker panel
Electrical Wire and Cable

120 and 240 Volt Motor Wiring

How to Wire a Motor for 240 Volts when the Motor is Designed for 120/240 Volts for Better Efficiency.


How to Wire a 120/240 Motor for 240 Volts

Electrical Question: When wiring a 120/240volt motor is there any significant difference in power consumption 120v vs 240v, and any lose or gain in motor longevity?

This electrical question came from: Bruce , a Homeowner from Yosemite, California.
See more about Home Wiring for California

Dave’s Reply:
Thanks for your electrical question Bruce .

Wiring a Motor for 240 Volts

Application: Wiring an Electric Motor.
Skill Level: Intermediate to Advanced – Best Performed by a Licensed Electrician or Certified Motor Technician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on experience with electric motors.
Precaution: Electric motors are best serviced by an experienced electrician or knowledgeable technician. Changes in the wiring of an electric motor should only be made after the electric motor circuit has been identified and turned OFF and Tagged.

Motors that are Designed for 120/240 Volts

The Benefits of Wiring a Motor for 240 Volts When it is an Option

The Advantages of a 240 Volt Motor
Bruce, thanks for your question from Yosemite,CA – which is one of my favorite places to stay.  I just love Yosemite! Specifically Cabin 819 in Curry Village near the Awahnee Hotel which is the absolutely best place to be for Thanksgiving or Christmas.

The advantages of wiring a 120/240 volt motor for 240 volts is as follows:

IMPORTANT

More about 220 Volt Wiring Diagram

Electrical Wiring

220 Volt Wiring Diagram
220 Volt Wiring Diagram
Wiring 220 Volt Electrical Outlet
Home electrical wiring includes 110 volt outlets and 220 volt outlets and receptacles which are common place in every home. See how electrical outlets for the home are wired.

This link is helpful as a Homeowner
Do-It-Yourself Electrical

How to Wire a Motor for 240 Volts



Learn How to Wire it Right with my
Complete Guide to Home Electrical Wiring
Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electrical Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
Electrical Codes for Home Electrical Wiring
....and much more.

» Click here to learn more about Home Electrical Wiring «
  repair electrical wiring  


MORE ABOUT THIS TOPIC: Motor

Frequently Asked Questions and Comments

Questions about: 120 and 240 Volt Motor Wiring


  1. Ed Lawlor says:

    I have a residential unit with a fan coil wired for 208/230 volt motor. I am replacing the unit with a 120 volt EC motor. Can I use the existing wiring circuit (use one leg) to power the new equipment? Did not want to increase customer costs with new 120 volt circuit home run.
    Thanks.

    • Dave Rongey says:

      Hi Ed,
      If the existing circuit is dedicated, and the amperage is within the specs of the new motor then it can be converted to be 120 volt at the panel and at the motor connections. However, you should understand that the 120 volt motor will require more amperage, and this may affect the performance of the unit. In cases such as this it is best to replace the motor with one of the same specs to make sure the unit is left in OEM condition. This may keep you out of a potential problem with the customer in the future, plus you will not have to make any wiring changes. 😉
      I hope this helps,
      Dave

  2. Timothy says:

    Can I Wire Two 120volt Motors to a 240volt circuit?

    What if I have two 120v motors which operate at 14amps? I cannot run them on a single 20amp circuit.However, I have a 240 volt (4 wire) circuit which can handle much more amperage. If I was to wire one pole of each motor to the neutral and the remaining pole each to a separate hot wire (Having two 120v powers from one circuit) would that power each motor and not bust the amperage limit? Also, will there be any back-EMF effects through the neutral (which is shared)?

    • Dave Rongey says:

      Circuits for Two 120volt Motors

      Hi Timothy,
      Using a multi-wire 4wire circuit for two 120volt motors would depend on the type of motors that would be connected and the application. However, due to the amperage of the 120volt motors as described, and the possibility of overloading a shared neutral it would be best to install two separate circuits, one dedicated circuit for each motor.
      Dave

  3. William says:

    Need Wiring Diagram for a Robbins Myers Motor
    I have a old Robbins & Myers motor. The plate reads, 110/220, 1725 RPM, frame S204, M/S 4470, SN AC111/94.
    There is no wiring diagram. There are 6 leads, all the same color.
    They do have numbered clip, 1, 2, 3, 4, 8, 8.
    What is the connections to run on 110 volts.

    Thanks.

COMMENTS and QUESTIONS

Add your Comment or Quick Electrical Question about:
120 and 240 Volt Motor Wiring

Please provide detailed information about your Quick Electrical Question:
Remember, The more info I have, the better I can help you!
Thank You So Much.

To Ask a Detailed Question Click Here:Home Electrical Question and get an Instant Reply.