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  • electrical question

    I need to run 4 #10 wires & 2 #12 wires. The run is 40' or less. What is the minimum conduit size? Two(2) 30 amp circuits with grounds.
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  • #2
    Originally posted by MMW View Post
    I need to run 4 #10 wires & 2 #12 wires. The run is 40' or less. What is the minimum conduit size? Two(2) 30 amp circuits with grounds.
    MMW; For where and for what, are you having to run theses cables ?

    .............. Norm :
    www.normsmobilewelding.blogspot.com

    Comment


    • #3
      Depends on the type of Conduit yer using.

      I think you can get 5 #10 in 1/2" EMT but only 3 in RNC (PVC)

      If you go with 3/4" yer good for either one.


      I'm sure a Sparky will provide an answer.
      Ed Conley
      http://www.screamingbroccoli.net/
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      • #4
        Originally posted by nfinch86 View Post
        MMW; For where and for what, are you having to run theses cables ?

        .............. Norm :
        Norm,

        it is not cable
        Ed Conley
        http://www.screamingbroccoli.net/
        MM252
        MM211
        Passport Plus w/Spool Gun
        TA185
        Miller 125c Plasma 120v
        O/A set
        SO 2020 Bender
        You can call me Bacchus

        Comment


        • #5
          Wire !!

          Originally posted by Broccoli1 View Post
          Norm,

          it is not cable
          OK Ed; Picky, Picky !! Then where are you puttin' said WIRE !!:

          ............... Norm
          www.normsmobilewelding.blogspot.com

          Comment


          • #6
            Originally posted by nfinch86 View Post
            OK Ed; Picky, Picky !! Then where are you puttin' said WIRE !!:

            ............... Norm
            inna Conduit
            Ed Conley
            http://www.screamingbroccoli.net/
            MM252
            MM211
            Passport Plus w/Spool Gun
            TA185
            Miller 125c Plasma 120v
            O/A set
            SO 2020 Bender
            You can call me Bacchus

            Comment


            • #7
              Norm-- Indoors, in my shop. One circuit will be to power a phase converter & the other circuit along with the third leg off the phase converter will be to a 3-phase outlet. Just following the manufacturer's wiring diagram but wanted to make sure it is code with conduit size. I was thinking of using 3/4 emt but wanted someone who knows to double check my thoughts.
              Last edited by MMW; 11-12-2009, 02:46 PM.
              MM250
              Trailblazer 250g
              22a feeder
              Lincoln ac/dc 225
              Victor O/A
              MM200 black face
              Whitney 30 ton hydraulic punch
              Lown 1/8x 36" power roller
              Arco roto-phase model M
              Vectrax 7x12 band saw
              Miller spectrum 875
              30a spoolgun w/wc-24
              Syncrowave 250
              RCCS-14

              Comment


              • #8
                use 3/4

                Use 3/4 anything smaller and pulling wires IS A PITA.
                Kevin
                Lincoln ranger 305g x2
                Ln25
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                Miller 30a spoolgun
                Wc115a
                Lincoln 210mp
                F550 imt service truck

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                • #9
                  Originally posted by Broccoli1 View Post
                  inna Conduit
                  Ed; You one Funny Feller !!!

                  .............. Norm
                  www.normsmobilewelding.blogspot.com

                  Comment


                  • #10
                    Originally posted by MMW View Post
                    Norm-- Indoors, in my shop. One circuit will be to power a phase converter & the other circuit along with the third leg off the phase converter will be to a 3-phase outlet. Just following the manufacturer's wiring diagram but wanted to make sure it is code with conduit size. I was thinking of using 3/4 emt but wanted someone who knows to double check my thoughts.
                    MMW; I can't help on the 3 - Phase business !
                    What ya plannin' on runnin' anway ?

                    .............. Norm
                    www.normsmobilewelding.blogspot.com

                    Comment


                    • #11
                      What difference does it make, Norm??? The man stated the size of the wire, the number of wires, wants to know what conduit to use.

                      Does knowing what he's gonna do with it, make a difference in your answer??? IF, of course, you DO have an answer????
                      Obviously, I'm just a hack-artist, you shouldn't be listening to anything I say .....

                      Comment


                      • #12
                        3/4 should be sufficient, but,,,, it could depend on what he is running, it may be a valid question. Some scenarios might only allow for 3 current carry conductors depending on load. If one isn't smoking on more than 30A on the 10's and 20 on the 12's its probably good to go. Kind of rudimentary explanation.

                        Comment


                        • #13
                          Conduit size

                          Use 3/4". You can down size one wire gauge size for the Neutral and one more for the Ground. In other words if you're running # 10 for the 3 legs of the 3 phase you can use a #14 for the ground. If you run a #8 for a single phase you could use a #10 for the neutral (usually a white wire) and a #12 for the ground (usually a green wire).

                          Dont forget to color code you three legs of the three phase. Red, black and orange are commom colors.

                          If you need help, don't hesitate to contact a qualified electrician. And buy a bottle of wire pulling lubricant. You will thank yourself for this extra purchase.

                          Using non metalic pvc conduit is easier than having to bend the emt. And you will save the bender cost. But you need to check codes first to see what conduit is allowed. Providing of course you care about that.
                          Mustangs Forever!

                          Miller equipment.

                          Comment


                          • #14
                            Originally posted by Tryagn5 View Post
                            Use 3/4 anything smaller and pulling wires IS A PITA.
                            Kevin
                            Ditto that, As that conduit fills up 1/2'' will be no fun to get all the wires through,besides with 3/4'' if you want to add anything later it will be easier.Mike

                            Comment


                            • #15
                              1/2" EMT conduit is adequate. Now let me explain.
                              NEC 328.52 Number of Conductors: The number of conductors shall not exceed that permitted by the percentage fill specified in Table 1, Chapter 9.
                              NEC allows 40% of the cross sectional area of the conduit to be filled with wires (when running more than 2 wires, according to table 1 chapter 9).

                              The cross sectional area of 1/2" EMT conduit (which is actually .622" ID) is pi*.311^2 or .304 sq in, of which only 40% is allowed to be filled, or .122 sq in.

                              The cross sectional area for #10 THHN is .0211 sq in and for #12 it is .0133 sq in.

                              So the total cross sectional area of wires are 4*.0211 +2*.0133=.111 sq inches, or 36.5% of the cross sectional area.

                              No sweat pulling wires through a conduit that is less than 40% filled.

                              So you can use any size EMT you want. But if you use 1/2, consider it filled to capacity.
                              Last edited by Bodybagger; 11-12-2009, 11:09 PM.

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