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Converting a 120 Volt Motor to 240 Volts

By Dave Rongey - Summary:

How to Convert the Electrical Circuit Voltage for a Motor: There are multiple problems here. You and the electrician did not discuss exactly what the 240 volt outlet would be used for. This is a big mistake, and I’m amazed that the electrician did not ask you what the circuit would be used for.

Converting the Electrical Voltage of a Motor

Electrical Question: I have an old Craftsman table saw that can run on either 120v or 240v with a minor change within the motor, which has three input wires – a ground and two lines.  For some years, I’ve operated it at 120v, but it lacks the power to rip certain hardwoods.

Clearly, I’m missing something, but what?
Background: Michael, a Handyman from Sherwood, OR

Dave’s Reply:
Thanks for your electrical wiring question Michael.

How to Convert the Electrical Circuit Voltage for a Motor

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4 Responses to “Converting a 120 Volt Motor to 240 Volts”
  1. Dave Rongey says:

    Hi John,
    Typically the voltage of these types of motors cannot be changed unless it is specifically stated on the label. However you may want to contact the manufacturer and see if they recommend a voltage converter that may be used to change the voltage from 240 to 120.
    I hope this helps you,

  2. John Healey says:

    I bought 2 ALECO DRYWALL SANDERS from a source online. They both have 120 volt electric motors. Can these motors be changed to 240 volts as I live in New Zealand where our country is 240 volts. I look forward to hearing from you.
    Kind Regards,

  3. admin says:

    Hi Don
    It would be very helpful for you to provide the Brand, Model, and the nameplate information from this electric motor in order to see what different wiring configuration are allowed.

  4. don Julien says:

    Ask the Electrician:

    I have a 700 hp 900 rpm 4999 volt electric motor (3).
    It is 120 v 60HZ.
    I would like to change it to 220 Volts 50HZ?
    Is it possible to begin with?
    Is it fairly simple(less expensive)?
    Is it very time consuming(More expensive)?
    How does one do it?

    Much Appreciated

    don julien