hey guys I need help with what installing new pump in 150 ft deep well ,the first thing I need to know is ,we have 240 ft away from the panel to the well so I need to make a sub panel to run wires but what kind of awg need to run it properly the pump is 230 v. we have a shed near of well with a air conditioner and 2 lights ty for your help it will be very appreciated.

 

If you are selecting a pump to replace the one that is there now DO NOT get a bigger one unless you don't mind ruining your well. If you don't mind ruining your well then knock yourself out. Too many times we get people here saying, "HELP! I replaced my old 1/2HP pump with a new 3/4HP one and now I keep running out of water! What did I do wrong?!" The worst part is that by overpumping the well they can kill it and then they have to pay for a new well to be drilled. Kind of a major mistake.

If you are replacing the pump, just use the old wires since it SHOULD be the same sized pump or smaller.

But let's assume you have a new well with a new pump. The well driller should have told you what kind of pump you should use. Once you know that, then you will know the amperage and once you know that, you can use one of the many wire size calculators that are all over the web. Just google in "wire size calculator" and you will find one.

240 feet means a pretty big voltage drop unless you use thick enough wire. If you err, err on the side of too thick.

If you want to run the wire from the shed into the well, you should add the amperage of the A/C (it's on a label on te unit) to the pump amperage and add a couple of amps for lights. Then use the calculator to know how thick the wire will be for the entire load. Then have the wire run into a circuit breaker box (called a "load center") then run separate circuits to the lights, the A/C unit and the pump. So you would have really thick wire running to the shed, then thinner wire to the different devices.

That's if you want to do the job right.