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Discussion Starter · #1 ·
In the rewiring of 50gal water heater replacing the 10-2 copper with 10-3 copper wire. the water heater had only two connecting wires; black and red. The white wire from the original 10-2 going to the heater was attached to the grounding screw noted on the top of the heater. In replacing with the 10-3 should I again attach the wht. neutral wire to the grounding screw and run the bare ground to a cold water pipe?
 

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A two conductor cable + ground is all that is needed for a water heater. You do not need a neutral, just two hots. The white will get re-identified as a hot with black or red tape or magic marker.

I do not know how yours was functioning with a hot connected to ground.

Do not make any connections between a water line and the wiring for grounding.
 

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There is no white used on a straight 240 volt unit. The white in the cable is used as a hot conductor and is re-marked to show its new usage.
 

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Cap off the white, and connect the bare to the ground screw on the water heater.
 

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Electrician
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black to black
white to red
bare to the ground
Mark the white red with a marker or electrical tape.

Just because it is white does not mean it has to be a neutral.
 
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