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deep well 230v with 12/3?

Posted by gordoflako (My Page) on
Thu, Mar 25, 10 at 16:49

the weel drillers put 12/3 from well to house/ I have the same inside the house. first the preasure switch iis only set up as 120. so easy blk/ wt ground. Do I wire nut the red with the feed to the control box? the white from the load center is neutral. So in the control box does red goto r or to L2 and on ?

thanks gordo


Follow-Up Postings:

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RE: deep well 230v with 12/3?

You need to know the pump information before you can hook it up.


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RE: deep well 230v with 12/3?

Is the pump wired for 240V and the pressure switch for only 120V? What do you want to do? Have your pump run at 240V or 120V? Your description is confusing.


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RE: deep well 230v with 12/3?

The pressure switch only needs to open one leg of the 240 V to control the pump.


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RE: deep well 230v with 12/3?

The depth to the pump, the distance from the house to the well and the HP (or amperage draw) of the pump are all important considerations. The #12 is rather small for the typical water well submersible pump installation.


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RE: deep well 230v with 12/3?

Is there really 12/3 running to the pump? Most well pumps that I've worked with only require 2 conductors, and run at 240V (and frequently require heavier wiring). The pressure switch would also need to handle 240V (and the current required to run the pump). How do you know that the switch is set up for 120V?


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RE: deep well 230v with 12/3?

well is 230ft, 1hp pump, 90ft rom house. 7amp on control switch provide from well diggers. i guess i can take a close look at presure switch but only two conections for line voltage (square d). so i'm thinking one leg with neutral to preasure swith, wire nut 2nd leg (red)upto control box. blk L1,wt L2, red (2nd leg to r).

sorry it takes time to reply, out in the stick off the grid. no internet until hardware runs. thanks or the replys

g


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RE: deep well 230v with 12/3?

At 320' for your feed you would need to upsize the wire by 2 sizes, so I would suggest 10/2 running at 240V. Two connections for line voltage labelled L1 and L2 means 240V.


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RE: deep well 230v with 12/3?

Still need to confirm pump specs. Is it a two wire or three wire pump? Is it 120 or 240 volts?


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RE: deep well 230v with 12/3?

Why would it be a 3 wire pump? It's either 120V or 240V, but not both at the same time, like a stove or dryer.


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RE: deep well 230v with 12/3?

The 3-wire submersible pumps have a control box mounted above ground level. The 3-wire is more efficient in electricity use and has higher starting torque. Costs more to buy and install. But the supply to the control box is just the two conductors for 240 volts plus the equipment grounding conductor. The original poster seems slow to offer requested information or to clarify exactly what is meant by 12-3. I quickly stop trying to help those cases.


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RE: deep well 230v with 12/3?

So, 2 wire 240V feed to the the control box, and from the box to the pump is a 3 wire feed? Busdriver, can you explain how that works.


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RE: deep well 230v with 12/3?

Yes three wire feed to the pump. Since the OP has said the pump feed is 12/3 that is why I am trying to clarify what he has.
In order for a single phase motor to start there is a second winding called the start winding that initiates spinning. It is only used to start the motor spinning then is switched off as the motor reaches speed. It also determines which direction the motor spins. A two wire motor has the capacitor and switching built into the motor. A three wire motor brings that connection out to a control box where the capacitor and switch are located.


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RE: deep well 230v with 12/3?

Thank you, joed. Now I understand.


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