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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?
 

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Just strip all the insulation off. Conductors this small are not permitted to be re-marked, but you can strip it.
 

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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?
Watch out, if you put 240v on a 220v wire, it could catch on fire
 

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I just did a panel change out where the A/C was a 10/3 with no ground. I just wrapped a peice of green tape around it and the inspector was happy.
 
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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?
You mean 240?

You can reuse it. Either strip the insulation off or just re tape it green (I know technically not allowed to remark smaller wires). Move the neutral wire to the ground buss, tape or strip and call it a day.
 

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From what the code says your only allowed to remark a white as a hot but not as a ground. At least that how I read it. I think...
Strip off the white insulation in its entirety and you have true bona fide 220 volt wire with ground.
 

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I just did a panel change out where the A/C was a 10/3 with no ground. I just wrapped a peice of green tape around it and the inspector was happy.
A reasonable inspector.
 
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felonious smile.
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I agree. What the hell are they talking about. Can't figure out how to make a 10/2 Romex out of 10/3. Lmao.
Believe it or not but your government takes topics as petty as this and will argue it and even spend thousands to research it.
 

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Re identifying ground

Since your only reallocating the red or black as a ground, just re identify using a permanent method (aka green tape over the visible portion in the panel and at the water heater one you change to the ground bar, see article 250 of nec for any additional questions on ground identification) then as long as 90.3 the authority having jurisdiction doesn't have a problem with it, you are good to go.
 
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