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Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 7428
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: 9 months ago.
Category: Electrical
Expert:  Rico Soma replied 9 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 9 months ago.

Do you have a circuit run for the pump?

Customer: replied 9 months ago.
I don't know but I assume it's at least 3/4 hp because of the depth
Expert:  Rico Soma replied 9 months ago.

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

Expert:  Rico Soma replied 9 months ago.

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

Customer: replied 9 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 9 months ago.
A black, a red and a green
Expert:  Rico Soma replied 9 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 9 months ago.
There is no existing wiring from the panel to the pump or pressure switch
Expert:  Rico Soma replied 9 months ago.

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

Customer: replied 9 months ago.
I'll check it and get back to you right away
Expert:  Rico Soma replied 9 months ago.

Ok.

Expert:  Rico Soma replied 9 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 9 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 9 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 9 months ago.
There is no circuit for it at the panel box
Expert:  Mike G. replied 9 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 9 months ago.
The well is about twenty feet from the panel and there is a holding tank in the basement, not wired
Customer: replied 9 months ago.
The well water line is plumbed into the holding tank.
Expert:  Mike G. replied 9 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 9 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 9 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 9 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 9 months ago.

No problem, I'm online every day.

Customer: replied 9 months ago.
Thanks.
Expert:  Mike G. replied 9 months ago.

You're welcome.

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