Announcement

Collapse
No announcement yet.

conduit fill

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    conduit fill

    Hi,
    what size EMT for (4) 3/0 THHN, + 1/0 EQG, Cu ????

    thank you

    #2
    What do YOU come up with?

    Comment


      #3
      I know, I know! Pick me, pick me!
      Master Electrician
      Electrical Contractor
      Richmond, VA

      Comment


        #4
        Use Tables 4 and 5 in Chapter 9

        Chapter 5 gives you the area of the conductors-- so 3/0 THHN is .2679 sq. in. Now multiply by how many conductors you have and then do the same for 1/0.

        Now add them together and go to Table 4 -- the first table is for EMT and look under the col. for more than 2 wires and find a conduit size that is at least as large as your calculation
        They say I shot a man named Gray and took his wife to Italy
        She inherited a million bucks and when she died it came to me
        I can't help it if I'm lucky

        Comment


          #5
          Bigger than 3/4"

          Roger
          Moderator

          Comment


            #6
            Originally posted by roger View Post
            Bigger than 3/4"

            Roger
            Yep, I think 1" would be better.

            Comment


              #7
              It will fit in 4”

              Comment


                #8
                Originally posted by jusme123 View Post
                It will fit in 4”
                I'n guessing he means 'minimum' size.
                Master Electrician
                Electrical Contractor
                Richmond, VA

                Comment


                  #9
                  Hint: It's the same size whether you pull in the 1/0 EGC or not.

                  Not sure why you'd need a 1/0 EGC, though.

                  Comment


                    #10
                    Originally posted by 480sparky View Post
                    Not sure why you'd need a 1/0 EGC, though.
                    Or any EGC, for that matter.
                    Master Electrician
                    Electrical Contractor
                    Richmond, VA

                    Comment


                      #11
                      Originally posted by LarryFine View Post
                      Or any EGC, for that matter.
                      Could be specs, but still.... 1/0 EGC for 3/0's?

                      Sounds like a test question to me.

                      Comment


                        #12
                        10 inch
                        Bob

                        Comment


                          #13
                          You can skip the calculation by looking in Table C.1 in Annex C.
                          Rob

                          Moderator

                          All responses based on the 2017 NEC unless otherwise noted

                          Comment


                            #14
                            Another option, there is also this great thing called Google and the internet. Open your computing terminal, and type in "raceway fill calaculator" and I bet you a Reuben you will have multiple choices.
                            Ethan Brush - East West Electric. NY, WA. MA

                            "You can't generalize"

                            Comment


                              #15
                              Originally posted by infinity View Post
                              You can skip the calculation by looking in Table C.1 in Annex C.
                              annex C is only if all the conductors are the same size
                              They say I shot a man named Gray and took his wife to Italy
                              She inherited a million bucks and when she died it came to me
                              I can't help it if I'm lucky

                              Comment

                              Working...
                              X