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    NC Dept of Insurance Official Interpretations

    If anyone wants a copy of NCDOI official interpretation of some commonly disputed sections in the 2017 NEC then click on the link below. I advise you to download it into word and the links should work. The links just take you to other areas of the document. Move your mouse to the link then use ctrl and click to activate the link.

    NCDOI Formal Interpretation
    Last edited by Dennis Alwon; 10-10-18, 03:34 PM.
    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

    #2
    Dennis that's for the 2017 NEC? I think that you had a typo in your post.
    Rob

    Moderator

    All responses based on the 2017 NEC unless otherwise noted

    Comment


      #3
      Originally posted by infinity View Post
      Dennis that's for the 2017 NEC? I think that you had a typo in your post.
      Why didn't you fix it? lol

      Thanks I got it
      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


        #4
        Originally posted by Dennis Alwon View Post
        Why didn't you fix it? lol

        Thanks I got it


        I found this question and answer interesting:

        Question 2:
        If a metal underground water pipe is used as part of an electrode system and is supplemented with a ground rod, is another grounding electrode required to supplement the supplemented ground rod?

        Answer 2:
        No. The requirement of section 250.53(D)(2) requires one supplement electrode of a type chosen from sections 250.52(A)(2) through (A)(8), in which a rod is listed in section 250.52(A)(5).
        Both the water pipe and the rod must comply with the installation requirements of section 250.53(A). Because the water pipe and the rod make two electrodes, each supplement the other; thus, 250.53(A)(2) is satisfied.
        Rob

        Moderator

        All responses based on the 2017 NEC unless otherwise noted

        Comment


          #5
          Originally posted by infinity View Post


          I found this question and answer interesting:
          Question 2:
          If a metal underground water pipe is used as part of an electrode system and is supplemented with a ground rod, is another grounding electrode required to supplement the supplemented ground rod?

          Answer 2:
          No. The requirement of section 250.53(D)(2) requires one supplement electrode of a type chosen from sections 250.52(A)(2) through (A)(8), in which a rod is listed in section 250.52(A)(5).
          Both the water pipe and the rod must comply with the installation requirements of section 250.53(A). Because the water pipe and the rod make two electrodes, each supplement the other; thus, 250.53(A)(2) is satisfied.
          Oooo. I LIKE it.
          Another Al in Minnesota

          Comment


            #6
            Not sure how a water pipe is supplementing a single ground rod when the water pipe gets changed to plastic.
            Rob

            Moderator

            All responses based on the 2017 NEC unless otherwise noted

            Comment


              #7
              Originally posted by infinity View Post
              Not sure how a water pipe is supplementing a single ground rod when the water pipe gets changed to plastic.

              It's not, in fact, the rod is really only supplementing the water line specifically for that reason. When the electrode becomes plastic then the rod is still there. So technically if they change the copper pipe to plastic then one should have to add another rod.
              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


                #8
                Originally posted by Dennis Alwon View Post
                It's not, in fact, the rod is really only supplementing the water line specifically for that reason. When the electrode becomes plastic then the rod is still there. So technically if they change the copper pipe to plastic then one should have to add another rod.

                Exactly that's why I disagree with their response to the question unless the single rod is 25 ohms or less.
                Rob

                Moderator

                All responses based on the 2017 NEC unless otherwise noted

                Comment


                  #9
                  Originally posted by infinity View Post
                  Exactly that's why I disagree with their response to the question unless the single rod is 25 ohms or less.
                  The install is correct but there seems to be a disagreement as to the explanation. Is that how you see it.
                  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


                    #10
                    I thought we’re werent supposed to worry about future ‘what ifs’ ? We would never get done.
                    Tom
                    TBLO

                    Comment


                      #11
                      Originally posted by ptonsparky View Post
                      I thought we’re werent supposed to worry about future ‘what ifs’ ? We would never get done.
                      The NCDOI can interpret the code and make a formal decision as to how something is interpreted. You are correct that we should use what iof scenarios but that may be just a reason as to why their interpretation makes sense.
                      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
                        Originally posted by Dennis Alwon View Post
                        The install is correct but there seems to be a disagreement as to the explanation. Is that how you see it.
                        How does a single rod without a resistance of 25 ohms or less qualify as an electrode?
                        Rob

                        Moderator

                        All responses based on the 2017 NEC unless otherwise noted

                        Comment


                          #13
                          Originally posted by infinity View Post
                          How does a single rod without a resistance of 25 ohms or less qualify as an electrode?
                          Where does it say that?

                          Question 1:
                          If only ground rods are used as an electrode system for a single family dwelling, are two required?

                          Answer 1:
                          Single electrodes made of rod, pipe, or steel plates must have a resistance to ground of 25 ohms or less, or must be augmented by an additional electrode of a type specified by section 250.52(A)(2) through (A)(7). The installer is required to assure the system meets this requirement and submit proof that is acceptable to the local electrical inspector.
                          Note: In extensive testing throughout North Carolina soil conditions have found to be of types prohibiting conductivity meeting the 25 ohms or less requirement for resistance.

                          Question 2:
                          If a metal underground water pipe is used as part of an electrode system and is supplemented with a ground rod, is another grounding electrode required to supplement the supplemented ground rod?

                          Answer 2:
                          No. The requirement of section 250.53(D)(2) requires one supplement electrode of a type chosen from sections 250.52(A)(2) through (A)(8), in which a rod is listed in section 250.52(A)(5).
                          Both the water pipe and the rod must comply with the installation requirements of section 250.53(A). Because the water pipe and the rod make two electrodes, each supplement the other; thus, 250.53(A)(2) is satisfied.
                          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


                            #14
                            I disagree with their answer for the for the following reasons section 250.53 D(2) requires the supplemental grounding electrode but also states a rod, pipe or plate must comply with 250.53A and there it states a single rod must be supplemented by an additional electrode, excluding water pipe, or meet the 25 ohm requirement.
                            250.53 Grounding Electrode System Installation.
                            A (2) Supplemental Electrode Required. A single rod, pipe,
                            or plate electrode shall be supplemented by an additional
                            electrode of a type specified in 250.52(A)(2) through
                            (A)(8). The supplemental electrode shall be permitted to be
                            bonded to one of the following:
                            (1) Rod, pipe, or plate electrode
                            (2) Grounding electrode conductor
                            (3) Grounded service-entrance conductor
                            (4) Nonflexible grounded service raceway
                            (5) Any grounded service enclosure
                            Exception: If a single rod, pipe, or plate grounding electrode
                            has a resistance to earth of 25 ohms or less, the
                            supplemental electrode shall not be required.

                            (D) Metal Underground Water Pipe. If used as a grounding
                            electrode, metal underground water pipe shall meet the
                            requirements of 250.53(D)(1) and (D)(2).
                            (2) Supplemental Electrode Required. A metal underground
                            water pipe shall be supplemented by an additional
                            electrode of a type specified in 250.52(A)(2) through
                            (A)(8). If the supplemental electrode is of the rod, pipe, or
                            plate type, it shall comply with 250.53(A).
                            supplemental electrode shall not be required.
                            Rick Napier
                            Inspector and Instructor

                            Comment


                              #15
                              I am not seeing what is wrong. You can have 2 rods or if there is a water pipe (assuming that it is an electrode, of course) you must bond it and then add an additional electrode which is usually a rod.

                              Is that not what is being said?
                              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

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