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How To Convert a 30 Amp 250 Volt Outlet to a 15 Amp 220 Volt Outlet


By Dave Rongey - Summary:

Guide for Converting a 220-250 Volt Circuit: The Process to follow for Converting a 220 Volt Circuit.


Guide for Converting a 220-250 Volt Circuit

Electrical Question: I have an outlet that is rated for 250v and 30 amps, which is being used for and Air Conditioner.

  • I recently purchase a new Air Conditioner.
  • The new AC requires a 220volt and 15 amp rated outlet.
  • Do I have to change what I have or can it be used safely as it is currently?

Background: Marcello, a Homeowner from NY, New York.

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

Application: Converting a 220 Volt or 250 Volt Circuit.
Skill Level: Intermediate to Advanced. Work in electrical panels is not recommended for homeowners, non-experienced individuals or non-electricians.
Tools Required: Basic Electricians Pouch Hand Tools, voltage tester.
Estimated Time: Depends on personal level experience, ability to work with tools and 220 volt electrical circuit wiring.
Precaution: Identify the main circuit of the panel, turn it OFF and Tag it with a Note before working with the wiring or installing the 220 volt wiring and circuit breaker. Working in an electric panel is dangerous due to arc flash hazards and the possibility of electric shock.
Notice: Modifying a 220 volt circuit should be done according to local and national electrical codes with a permit and be inspected.

How to Convert a 220 Volt Circuit

  • Existing 220 Volt Circuit
    The existing circuit for the new air conditioner can be converted from 30 amps 250volt to 15 amps 220volts.
  • 220 Volt Circuits
    The range of 220 to 240 volts is typical, and electrical outlet receptacles are rated for 250 volts.
  • The New 240 Volt Circuit Breaker
    A new 15 amp 2-pole 240volt circuit breaker will need to be installed to replace the existing 30 amp circuit breaker.
  • The 250 Volt Outlet
    At the outlet location the existing 30 amp 250 volt outlet will need to be replaced with the specified 15 amp 220 volt outlet to match the cord of the new air conditioner unit.
  • Electrical Wiring at the Outlet
    If the #10 wires are too big for the new 15 amp outlet then splice #14 wires to the #10 wires to be used for the connection to the 15 amp outlet.
  • Wires Required for the Circuit
    NOTE: This conversion is only for a circuit that matches the same number of existing wires. If the new equipment requires a dedicated neutral wire and the existing circuit does not have one then a new circuit will be required which will have a dedicated neutral wire.

NOTE: See the equipment label for specific information about the electrical circuit and breaker size.

More about 220 Volt Wiring

For more information about 220 Volt Wiring Diagram
220 Volt Wiring Diagram

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

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Electrical Videos

Be Careful and Be Safe – Never Work on Energized Circuits!

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Be Careful and Be Safe - Never Work on Energized Circuits!
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FAQs Frequently Asked Questions and Comments

5 Responses to “How To Convert a 30 Amp 250 Volt Outlet to a 15 Amp 220 Volt Outlet”
  1. Abul hasan says:

    I would like to know how to find the amps in three using power a formula for a dual speed exhaust fan, they given two power, which one want to take for calculating 12/52 kw.

  2. Steven Murdoch says:

    I have a 50 amp 220 volt outlet in my garage on its own breaker in the main breaker panel. It was used for a welder. I want to plug a 3-prong 30 amp plug from a dryer into this outlet. Can I use an adapter to use this existing outlet or do I need to change the outlet and breaker to match the requirements of the dryer?

    • Dave Rongey says:

      Hi Steven,
      I personally have never purchased or installed a 50 amp to 30 amp receptacle converter, and it would be my option to convert the circuit to the 30 amp receptacle and circuit breaker as you have described for all around best protection and functionality.
      Dave

  3. AL says:

    Dave, I have put a 60 amp sub panel in my garage, from the main panel in my house,I used a double 3o amp breaker from the main panel in house which gives me 60 amps,I have connected the wiring to the sub panel,d0uble 30amp the same way it is connected to the main panel,black wire to one side and red wire to other pole,the other wire I taped with white tape for the neutral wire and connected it to the right side neutral bar, the ground wire is connected to the left side ground bar, looking into the panel, I believe this is the correct method to use,could you please advise me if I did this in the right manner, your help would appreciated, Thank You kindly
    ps please explain in detail this method,,,,

    • Dave Rongey says:

      Hi Al,
      Please see the post about Garage Electrical Wiring which should assist you.

      I should also point out that a 240 volt 60 amp circuit for a 60 amp sub panel is fed with a 2-pole 60 amp circuit breaker and the electrical wiring that is installed should also be rated for 60 amps.

      Do not take chances. If you do not fully understand this process I would encourage you to hire a licensed electrical contractor.

      Dave


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