Wiring a 3-Wire Dryer Outlet


By Dave Rongey - Summary:

Help with Electrical Wiring for a 30 amp 3-wire Dryer Outlet: Make sure that the white wire is wrapped with black or red electrical tape at both ends of the cable to identify it as being a hot wire and not a neutral wire.


Wiring a Dryer Outlet

Electrical Question: I need help wiring a 240volt outlet for a dryer.

This electrical question came from: Joe, a Homeowner from Texas.

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

How to Wire a 30 amp 3Wire Dryer Outlet

3 wire dryer outlet

Application: 240Volt Dryer Outlet Wiring.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and a Voltage Tester.
Estimated Time: Depends on personal level of electrical experience, ability to work with tools and the available access to the dryer cord electrical connection box.
Precaution: Identify the dryer circuit, turn it OFF and Tag it with a Note before working with the dryer outlet or cord wiring.

Wiring Connection for a 30amp 3wire Dryer Outlet

Yes Joe, that’s right, the L-shaped prong is for the ground wire.

  1. In an example like this the L shaped prong is the ground wire connection for the bare copper wire.
  2. Make sure that the white wire is wrapped with black or red electrical tape at both ends of the cable to identify it as being a hot wire and not a neutral wire.

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FAQs Frequently Asked Questions and Comments

6 Responses to “Wiring a 3-Wire Dryer Outlet”
  1. Dave Rongey says:

    Hi Hilton,
    Please check with the owners manual for the new dryer to see if it may be wired with the three wire system. Some new dryers require a dedicated neutral, which in that case would require a 4-wire circuit.
    I hope this helps,
    Dave

  2. Hilton says:

    I have a 3 wire outlet box for my current dryer and a 4 wire outlet box for my new dryer. Can I still use the 3 wires (Black, White, Copper) in the 4 wire box?

  3. Dave Rongey says:

    Hi Rich,
    Depending on the age of the home, some dryer circuits are wired with a 4wire circuit, and it could be that the last dryer had the 3wire hookup and the outlet was changed to be a 3wire outlet. This can be verified by inspecting the dryer outlet wiring, and if that is the case then it would be best to replace the 3wire outlet with a 4wire outlet and make sure to connect all 4 wires accordingly. Some newer dryers will allow converting from a 4wire cord to a 3wire cord, but that needs to be verified with the information about the exact dryer that you have. Please refer to the links in the above information that will lead you to the dryer wiring diagrams.
    I hope this helps.
    Dave

  4. rich says:

    I have a 3 prong dryer outlet but there are 4 wires red black green white the red and black on the sides and green connected to the bottom but the white is not connected, so will that not make the dryer work or is that in case I need to switch to a 4 prong.

  5. Dave Rongey says:

    Hi John,
    I believe what you are describing are the wire colors that are inside the dryer which are found connected to the wiring terminals. Typically the 3-wire power connections of the 240 volt lines are connected to the two outside terminals and the ground is connected to the center terminal. However you should verify this by closely looking at the wiring diagram that should be on the dryer, or on the inside of the cover plate of the terminal connection area, or check with the installation manual that came with the dryers. The installation manual will provide guidance for the correct connections for your specific dryers and will indicate if your may or may not use a 3-wire connection. This is important because many new dryers will require a 4-wire connection where a separate neutral wire is required.
    Dave

  6. john coningford says:

    I have 2 electric dryers both are 3wire hook up. One dryer has a black, neutral, ground, and red wire. The other has yellow/white, green and red wire. I want to hook up the one that has yellow/white green/red. Can put the black wire in place of the yellow?
    Thank you.