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    Table 250.122

    You have a 20 amp circuit with 12 awg and a 15 amp circuit with 14 awg in the same box. Does Table 250.122 prohibit tying the 12 awg and 14 awg equipment grounds together? I am very familiar with 250.148 but would like some insight into 250.122. Thank you for your time.

    #2
    No it's not prohibited and depending on who you ask some say that it's required.

    Welcome to the Forum.
    Rob

    Moderator

    All responses based on the 2017 NEC unless otherwise noted

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      #3
      Originally posted by infinity View Post
      ... depending on who you ask some say that it's required.
      The only instance I can think of when it is not required is when one is an isolated grounding conductor. Are there other instances I'm not aware of? Or are you referring to instances where the conductors simply pass through the box without splice or termination?
      Last edited by Smart $; 02-24-13, 03:46 PM.
      [COLOR=RoyalBlue]I will have achieved my life's goal if I die with a smile on my face.[/COLOR]

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        #4
        Thanks for the response and the welcome!

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          #5
          One thing to keep in mind. If the box is a metal one then your bond to the box would need to be sized according to the largest size EGC run.
          So in the OP's case, bond to box with 12 AWG.
          [COLOR=navy]If you aim at nothing, you will hit it every time![/COLOR]

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            #6
            Originally posted by Smart $ View Post
            The only instance I can think of when it is not required is when one is an isolated grounding conductor. Are there other instances I'm not aware of? Or are you referring to instances where the conductors simply pass through the box without splice or termination?
            When you are using non-metalic boxes there is nothing in the NEC requiring EGCs from seperate circuits to be tied together.

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              #7
              Originally posted by iwire View Post
              When you are using non-metalic boxes there is nothing in the NEC requiring EGCs from seperate circuits to be tied together.
              That is not how I read 250.148.
              Don, Illinois
              (All code citations are 2017 unless otherwise noted)

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                #8
                So Don do you view this as a violation?Click image for larger version

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                  #9
                  Originally posted by don_resqcapt19 View Post
                  That is not how I read 250.148.
                  Interesting.

                  250.148 Continuity and Attachment of Equipment
                  Grounding Conductors to Boxes.
                  Where circuit conductors
                  are spliced within a box, or terminated on equipment
                  within or supported by a box, any equipment grounding conductor(
                  s) associated with those circuit conductors shall be connected
                  within the box or to the box with devices suitable for
                  the use in accordance with 250.148(A) through (E).
                  How is a 15 amp lighting circuit associated with a 20 amp receptacle circuit?

                  I have argued this before with George S and he pretty much convinced me that it does not require all circuit EGCs to be connected together.

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                    #10
                    I read that section as saying that any EGC that is associated with any circuit in the box must be connected to all other EGCs that are associated with all other circuits in that box. Yes, I know we have discussed this before, but I don't think the wording is clear.
                    Don, Illinois
                    (All code citations are 2017 unless otherwise noted)

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                      #11
                      Originally posted by iwire View Post
                      When you are using non-metalic boxes there is nothing in the NEC requiring EGCs from seperate circuits to be tied together.
                      Originally posted by don_resqcapt19 View Post
                      That is not how I read 250.148.
                      Originally posted by iwire View Post
                      Interesting.



                      How is a 15 amp lighting circuit associated with a 20 amp receptacle circuit?

                      I have argued this before with George S and he pretty much convinced me that it does not require all circuit EGCs to be connected together.
                      Originally posted by don_resqcapt19 View Post
                      I read that section as saying that any EGC that is associated with any circuit in the box must be connected to all other EGCs that are associated with all other circuits in that box. Yes, I know we have discussed this before, but I don't think the wording is clear.
                      It comes down to the particulars of what the conductors do after entering the box...

                      If both circuits pass through the box without splice or termination, no interconnection or bonding required.

                      If one circuit passess through while the other is spliced and/or terminated within the box, no interconnection required, but bonding of the spliced and/or terminated circuit's EGC to grounding terminals, metallic box, etc. is required.

                      If both circuits are spliced and/or terminated, interconnection and bonding applies to both.

                      [edit to add: the preceding does not apply to isolated grounding conductors]
                      Last edited by Smart $; 02-25-13, 12:20 PM.
                      [COLOR=RoyalBlue]I will have achieved my life's goal if I die with a smile on my face.[/COLOR]

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                        #12
                        I have always read it as meaning all the equipment grounding conductor's from all circuits shall be tied together.
                        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

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                          #13
                          Originally posted by Dennis Alwon View Post
                          I have always read it as meaning all the equipment grounding conductor's from all circuits shall be tied together.
                          I've never read it that way, but in practice that is what I have always done... except for all pull throughs.
                          [COLOR=RoyalBlue]I will have achieved my life's goal if I die with a smile on my face.[/COLOR]

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                            #14
                            Originally posted by Smart $ View Post
                            I've never read it that way, but in practice that is what I have always done... except for all pull throughs.
                            That way you can't go wrong no matter how it reads.
                            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

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                              #15
                              Originally posted by Dennis Alwon View Post
                              That way you can't go wrong no matter how it reads.
                              Exactly
                              [COLOR=RoyalBlue]I will have achieved my life's goal if I die with a smile on my face.[/COLOR]

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