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Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7532
Experience:  Proven Professional 48 years Experience
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I have a deep well pump submersed at 380 feet. It has three

Customer Question

Hi. I have a deep well pump submersed at 380 feet. It has three wires, a green which is a ground I assume, and a red and black. The pump wasn't wired when I bought the house but I'd like to try and get it going. How should it be wired?
Submitted: 11 months ago.
Category: Electrical
Expert:  Rico Soma replied 11 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.

What size is the pump (HP) ?

Expert:  Rico Soma replied 11 months ago.

Do you have a circuit run for the pump?

Customer: replied 11 months ago.
I don't know but I assume it's at least 3/4 hp because of the depth
Expert:  Rico Soma replied 11 months ago.

You can't assume. That deep more like is 1 HP

Expert:  Rico Soma replied 11 months ago.

Is the pump wiring into the house from the well? if so what size is it?

Customer: replied 11 months ago.
All I can tell you for sure, without pulling the pump, is there are three wires coming from the pump to the surface.
Customer: replied 11 months ago.
A black, a red and a green
Expert:  Rico Soma replied 11 months ago.

That's really not enough info to safely wire this. At a minimum you need to know the wire size of what's showing at ground level but that assumes whoever dropped the pump into the well sized it properly.

Customer: replied 11 months ago.
There is no existing wiring from the panel to the pump or pressure switch
Expert:  Rico Soma replied 11 months ago.

I'm asking what the wire size is from the pump.

Customer: replied 11 months ago.
I'll check it and get back to you right away
Expert:  Rico Soma replied 11 months ago.

Ok.

Expert:  Rico Soma replied 11 months ago.

I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.

Expert:  Mike G. replied 11 months ago.

Hi, I'm Mike G and I'll be assisting you. Let me know the information already requested by the previous expert and we can continue.

Customer: replied 11 months ago.
It's a deep well pump submersed at 380 feet. It wasn't wired up when I bought the house but I'm trying to get it going. Coming up to the surface from the pump are three wires, a green 14 gauge, and a red and black 12 gauge.
Customer: replied 11 months ago.
There is no circuit for it at the panel box
Expert:  Mike G. replied 11 months ago.
  1. How far is the well from the panel?
  2. Is there a holding diaphragm tank or only a pressure switch?
Customer: replied 11 months ago.
The well is about twenty feet from the panel and there is a holding tank in the basement, not wired
Customer: replied 11 months ago.
The well water line is plumbed into the holding tank.
Expert:  Mike G. replied 11 months ago.

OK, there are issues with the wire size to the pump. 400 ft at minimum for a 15A 240V circuit required a #10 wire. You need to verify the wire size. It may have been the reason for being incomplete.

Customer: replied 11 months ago.
I have verified the wire size. As noted above, the green wire is 14 gauge and the red and black are both 12 gauge
Expert:  Mike G. replied 11 months ago.

If you have a 380ft deep well, and 20 ft from the panel. The voltage drop calculation only allows a 4 Amp load. Is there any way you can contact the drilling company to verify the size of the pump and nameplate info. I would expect the pump would have a bigger load. I don't want you to go ahead and get the motor because of low voltage.

Customer: replied 11 months ago.
Thanks Mike. If I can verify the size of the motor in the morning, can I get back to you?
Expert:  Mike G. replied 11 months ago.

No problem, I'm online every day.

Customer: replied 11 months ago.
Thanks.
Expert:  Mike G. replied 11 months ago.

You're welcome.

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