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Thread: Dryer outlet 3 to 4 prong conversion

  1. #1
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    May 2019
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    Davis, CA Yolo County
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    Dryer outlet 3 to 4 prong conversion

    I have a three prong dryer plug on a 30 amp breaker. The cable wired to it contains 2 conductors and a bare wire. My understanding is that the two conductors are both hot and that the bare wire is a neutral/ground (combined). Modern 4 prong outlets include separate neutral and EGC wires. To convert to a 4 prong, would it be code compliant to run an EGC from a nearby large EGC conductor (might be a solid #6 attached to water pipes), and then use the bare wire in the existing cable as a neutral? Or do I have to run a new line? I am trying to wire up a plug for electric car charging.

  2. #2
    Join Date
    Feb 2003
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    I am closing this thread in accordance with forum rules. This forum is intended for use by electricians and electrical contractors, inspectors, engineers, and vendors with their job-related duties. We are not allowed to provide how-to advice to persons who are not employed in this industry, or persons who do not perform electrical installation or maintenance as part of their jobs. Engineers are welcome to participate, but only if their questions do not involve attempts to perform their own electrical installation, troubleshooting, or maintenance work.

    I have retained a complete copy of this thread in an area accessible only to the moderators. It can be restored, if that action proves to be appropriate. So I have misjudged the situation, if for example this is related to your employment and not to your own home, then send me a PM to explain.
    Charles E. Beck, P.E., Seattle
    Comments based on 2017 NEC unless otherwise noted.

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