Sub Pump wiring

Discussion in 'Electrical Forum discussion & Blog' started by JeffGr, Nov 6, 2009.

  1. JeffGr

    JeffGr DIY Junior Member

    Messages:
    4
    Location:
    SC
    Currently I have a well 375' from the house. It is supplied via it's own meter from the elect. co. The entire electrical system is about to be condemmed. The overheads run through trees etc. I also need to replace the piping from the pump to the house.
    Getting rid of the meter will save me $180 per year in facility fees.
    The pump is a 1/2hp 110v. I plan on replacing it with a 220V 3/4 hp next summer.
    I need to install the new piping now so plan on running new electrical wiring now as well, while I have the trencher. So the pump will run off the house's electrical service eliminating all other wiring to the pump. I have a new 200 amp service at the house.
    With a 3/4hp 220v pump I can use #12 as it goes 480'. I will use a breaker box at the pump as well as a disconnect.
    Is there any economical options to use the existing pump on the new wiring? It is too long a run for 110v using #12. I would have to go #6 but the price is out of sight.
    I will be using UF cable and burying it 36" down. What is the proper way to permanently splice underground? Can I use crimp sleeves and epoxy filled heat shrink? Or do I have to try and find one run of wire? I'm rural so don't have the options of the big city.
  2. Spaceman Spiff

    Spaceman Spiff Architect

    Messages:
    277
    Location:
    Salt Lake City, Utah
    Looks like you need a #6 wire for the distance and voltage drop, not to mention the drop of cable down the well pipe.
    I would run 1-1/4" PVC conduit 36" underground next to the water pipe and pull in #6 THWN conductors. Then you don't have to worry about code violations regarding depth. I'd look up the burial depth but my code book is at home...
  3. Alectrician

    Alectrician DIY Senior Member

    Messages:
    689
    Do NOT run 400' of UF cable. You are asking for trouble.

    Install 1" PVC (about $200) and #6 wire minimum.

    http://www.electrician2.com/calculators/vd_calculator_initial.html


    Do NOT make splices underground. Again, that's just asking for trouble.



    Install this circuit properly and it will work for your grandkids. Cobble it together and you will hate your life.
  4. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    You may want to consider running Aluminum type XHHW wire in PVC conduit. That might be your cheapest option.

    Jason
  5. Ford2001

    Ford2001 New Member

    Messages:
    44
    Location:
    Manchester, Vermont
    voltage drop calculactor

    To: 220/221

    Me like the "Voltage Drop Calculactor" you posted.

    Where its saids: "enter 1-way circuit length in feet"

    Is it adding another 100 feet, if the one-way circuit length
    is 100 ft. ? I believe it would.

    Thanks.
  6. jar546

    jar546 In the Trades

    Messages:
    432
    Location:
    USA
    Don't forget the ground the well casing
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