Dryer outlet 3 to 4 prong conversion

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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.

charlie b

Staff member
Seattle, WA
Electrical Engineer
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.

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