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Old 09-20-2011, 10:54 AM   #1
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240 Well Pump uses 12/2 Wire?


Our shallow well pump has just about bit the dust. Because the well and equipment is so old, I've been nursing it along until we can get a new well drilled. Yesterday, the well man came. He said because we already have 240 volts to the pump, they would be able to reuse that wire to the panel. The wire is 12/2 Romex. I asked and he said it did not have a neutral. The two hots are attached to the switch and the ground goes back to the panel.

It has been bugging me, so I'll ask. How does the pump work with no neutral wire? I understand the hot wires to the switch, but doesn't the pump need a neutral wire for the electricity to "flow"?

The pump is connected to the bottom of the well via black iron and galvanized pipe. Does the pipe act as the neutral?

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Old 09-20-2011, 11:04 AM   #2
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240 Well Pump uses 12/2 Wire?


The current goes out one hot leg and returns on the other. Back and forth. No neutral required.

Tell me this romex is not underground or in the well casing.

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Old 09-20-2011, 11:22 AM   #3
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240 Well Pump uses 12/2 Wire?


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Originally Posted by Code05 View Post
The current goes out one hot leg and returns on the other. Back and forth. No neutral required.

Tell me this romex is not underground or in the well casing.
The current pump is in the basement. The Romex runs along the wall the 15 feet from the panel to the pump. He said he would put a box there to connect the wire to the new submersible pump.

I did a little searching after posting the original. They said the neutral in driers, ovens, etc, is for 110v components such as timers and clocks. It actually makes sense now. Thanks!
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Old 09-20-2011, 11:26 AM   #4
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240 Well Pump uses 12/2 Wire?


Here is an example of a dryer or range.


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