Announcement

Collapse
No announcement yet.

Table 310.15(B)(3)(a)

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

    Table 310.15(B)(3)(a)

    I have some 1 1/2 EMT with 42 #12 xhhw current carrying conductors. What is maximum over current device for these circuits

    #2
    Originally posted by jbolen View Post
    I have some 1 1/2 EMT with 42 #12 xhhw current carrying conductors. What is maximum over current device for these circuits


    This in a dry or wet location?

    Comment


      #3
      Originally posted by xformer View Post
      This in a dry or wet location?
      Is it going to make a difference with 42 ccc's?

      Comment


        #4
        Originally posted by xformer View Post
        This in a dry or wet location?
        It is probably xhhw-2 which would not matter if it is wet or dry
        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
          10 amp overcurrent protective device if it is 90C. You need to increase the wire size and then reduce the number of conductors or use 2 runs of conduit
          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


            #6
            Originally posted by david luchini View Post
            Is it going to make a difference with 42 ccc's?
            To properly apply 310.15B16 one must first look at 310.104A.

            In a dry location starting ampacity of #12 is 30 amps.
            In a wet location starting ampacity of #12 is 25 amps.


            I came up with 10 amps - dry / 5 amps wet.

            Comment


              #7
              Originally posted by xformer View Post
              I came up with 10 amps - dry / 5 amps wet.
              I came up with 15 amps - dry or wet

              Comment


                #8
                Originally posted by xformer View Post
                To properly apply 310.15B16 one must first look at 310.104A.

                In a dry location starting ampacity of #12 is 30 amps.
                In a wet location starting ampacity of #12 is 25 amps.


                I came up with 10 amps - dry / 5 amps wet.
                I think David's point is there probably isn't a 10 or 5 amp overcurrent protective device unless fuses are used. Not likely
                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


                  #9
                  Originally posted by david luchini View Post
                  I came up with 15 amps - dry or wet
                  How so?

                  Comment


                    #10
                    Originally posted by xformer View Post
                    How so?

                    Comment


                      #11
                      Originally posted by david luchini View Post
                      I came up with 15 amps - dry or wet
                      Are you going with next size up rule? The load of course would have to be less.
                      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


                        #12
                        I would ask what the capacity needs to be to serve the loads, and work backwards from there.
                        Master Electrician
                        Electrical Contractor
                        Richmond, VA

                        Comment

                        Working...
                        X