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    voltage drop help....

    i have a 950 ft run to wire a 20 amp 240 volt gate and 10 landscape lights around the gate...thinking about just putting a 30 amp subpanel out there. having problems on what size wire should i use with that voltage drop and do i use buck/boost transformer... the gate doesn't run on full 20 amp. any suggestions?

    thanks

    #2
    What is the actual load with lights and gate? If you want a full 30A @ 5% VD out there your looking at #2cu.

    Welcome to the Forum.

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      #3
      Originally posted by joem22 View Post
      i have a 950 ft run to wire a 20 amp 240 volt gate and 10 landscape lights around the gate...thinking about just putting a 30 amp subpanel out there. having problems on what size wire should i use with that voltage drop and [COLOR="red"]do i use buck/boost transformer[/COLOR]... the gate doesn't run on full 20 amp. any suggestions?

      thanks
      Just to point out, Never buck boost to over come voltage drop, simply because when all the load is not on the circuit (I.E. the gate motor) the voltage will rise back up and damage the load that is still on, I.E. control electronics, and or the lights, you have two possible choices, over size the conductors including the EGC as required, or transforming up to a higher voltage and transform back down, you will have to weigh which method is the most cost effective for the job.
      Last edited by hurk27; 07-24-11, 03:33 PM.
      Wayne A. From: N.W.Indiana
      Be Fair, Be Safe
      Just don't be fairly safe

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        #4
        Looks like 3 conductor #2 for 20 amps is the way to go.

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          #5
          Originally posted by bob View Post
          Looks like 3 conductor #2 for 20 amps is the way to go.
          Or #1al URD DB could cut cost?
          Wayne A. From: N.W.Indiana
          Be Fair, Be Safe
          Just don't be fairly safe

          Comment


            #6
            volt drop

            Originally posted by chris kennedy View Post
            What is the actual load with lights and gate? If you want a full 30A @ 5% VD out there your looking at #2cu.

            Welcome to the Forum.
            with the gate and lights i will be at about 20amps.Im thinking just to run #1al.. for cost,if i have 2 splice boxes will that make my voltdrop worse..thanks for the help...

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              #7
              Originally posted by bob View Post
              Looks like 3 conductor #2 for 20 amps is the way to go.
              thanks...

              Comment


                #8
                Originally posted by hurk27 View Post
                Or #1al URD DB could cut cost?
                thanks...

                Comment


                  #9
                  Im coming up with 3.42% vd for #4 awg and 2.81%vd for #3 awg, assuming 950', 240V, 2 phase, 20A. Keep in mind the OCP needs to be sized for this type of load as well.

                  See 210-19(A)(1) info note #4
                  5% total %VD is recommened
                  I know there are some LBCs that are more stringent, however.

                  Comment


                    #10
                    Originally posted by joem22 View Post
                    Joem22,
                    Try calculating the real load at each of the segments of your circuit.

                    The smallest load, at the furthest end, might only require #12
                    for that segment.
                    The largest load seen by the source would occur
                    at the nearest segment of the circuit, so maybe #2.
                    Other AWG would be used as sized from #12 all the way to #2.

                    Draw out a diagram,
                    and see what the individual loads are inside each segment.

                    Personally, I would not want to pull #2 all the way around.
                    Seems like wasted copper.

                    Anyway,
                    I don't have a wire-nut large enough to connect #2 to a #12
                    Glene77is, Memphis, TN. .....Electricity.is.Shocking.....׺`_

                    Comment


                      #11
                      Install a separate 5kVA service at the gate.

                      Originally posted by joem22 View Post
                      i have a 950 ft run to wire a 20 amp 240 volt gate and 10 landscape lights around the gate...thinking about just putting a 30 amp subpanel out there. having problems on what size wire should i use with that voltage drop and do i use buck/boost transformer... the gate doesn't run on full 20 amp. any suggestions?

                      thanks
                      joem22, What doesn't seem so obvious is the length of the "antenna" you are installing. That 950 feet of cabling could be a serious liability, especially if the area is prone to lightning.

                      If the Utility transmission line is relatively close to the gate, I would ask them to put in a Billboard Signage service w/ 5kVA 120/240V secondary. It would be much safer for the client. Either way you probably should install an appropriately rated TVSS at the gate to protect the gate controls, etc. , and also at the main building end of the circuit if you elect to run the 950' of cable.

                      Al

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