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what guage wire

Discussion in 'Irrigation' started by clc19chase, May 31, 2008.

  1. clc19chase

    clc19chase LawnSite Member
    Messages: 102

    trying to wire a 2 hp pump pulling 11.2 amps at 23o volts. wire will be running 300 ft from breaker to pump. should I use 10 ga. or 8 ga. wire to power the pump.
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,550

  3. advancedlawnsolutions

    advancedlawnsolutions LawnSite Member
    Messages: 62

    I ran into this same scenario last year. Same distance to. 10 gauge is fine. Direct burial cable, be sure to put it plenty deep.
  4. clc19chase

    clc19chase LawnSite Member
    Messages: 102

    Im still uncertain. I have a very experienced and reputable electrician saying 10 want work. But the home owner says the guy he knows (electrician) says 10 is plenty. I will be putting in thr system next week and dont want to start a "finger pointing contest" if 10 ends up too small. thanks for any additional info.
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,550

    If the voltage drop is less than 10 volts upon starting, then you should be okay, unless you get a low of brownouts in your area.
  6. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    using that page you referenced boots, and assuming a 24 amp startup, 600 feet of #10 gives you a drop of 14.6 volts
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,550

    True enough. I only used 300 feet to get a result, but 600 is proper for 'out and back' ~ I suspect you could still live with a 15 volt drop on 230, but there might be more specific info on some pages dealing with motors.
  8. WalkGood

    WalkGood LawnSite Bronze Member
    Messages: 1,910

    Is that a constant voltage drop or just at the momentary startup?

    Hopefully he has a "standard" 240volt to start with.
  9. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    Why exactly are you doing this and not an electrician?

    Think of it this way, would you trust an electrician to size zone pipe?
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,155

    I was thinking the same thing, two words: geek think. :hammerhead:

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