Changing 10/3 without ground to 10/2 with ground

Old 03-27-14, 06:06 PM
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Changing 10/3 without ground to 10/2 with ground

I have a 220v 10/3 wire with no ground just black, red, white (2 hots and a neutral) that used to run to an old oven that has since been replaced with gas unit. I want to run this wire to a water heater so I only need 10/2 with ground. The panel box is older with neutrals and grounds sharing one bar. Can I use the neutral wire as a ground and mark it on both ends as such?
Old 03-27-14, 06:31 PM
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It would technically be a code violation to reidentify the white as a grounding conductor. However it would work.

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