Should I bond pipes to ground in detached building subpanel?












1















In California.



My subpanel has a dedicated ground conductor run to it (ground and neutral bonded only at the main panel). The subpanel is in a building with its own plumbing, not connected to pipes where the main panel is located.



I know that I should not bond ground to neutral redundantly in the subpanel, but should I bond ground to plumbing independently from the subpanel?



My concern is that this will create an alternate path to ground.






electrical grounding-and-bonding







share|improve this question



























    1















    In California.



    My subpanel has a dedicated ground conductor run to it (ground and neutral bonded only at the main panel). The subpanel is in a building with its own plumbing, not connected to pipes where the main panel is located.



    I know that I should not bond ground to neutral redundantly in the subpanel, but should I bond ground to plumbing independently from the subpanel?



    My concern is that this will create an alternate path to ground.






    electrical grounding-and-bonding







    share|improve this question

























      1












      1








      1








      In California.



      My subpanel has a dedicated ground conductor run to it (ground and neutral bonded only at the main panel). The subpanel is in a building with its own plumbing, not connected to pipes where the main panel is located.



      I know that I should not bond ground to neutral redundantly in the subpanel, but should I bond ground to plumbing independently from the subpanel?



      My concern is that this will create an alternate path to ground.






      electrical grounding-and-bonding







      share|improve this question














      In California.



      My subpanel has a dedicated ground conductor run to it (ground and neutral bonded only at the main panel). The subpanel is in a building with its own plumbing, not connected to pipes where the main panel is located.



      I know that I should not bond ground to neutral redundantly in the subpanel, but should I bond ground to plumbing independently from the subpanel?



      My concern is that this will create an alternate path to ground.






      electrical grounding-and-bonding




      electrical grounding-and-bonding






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 3 hours ago









      MatthewMatthew

      5,037143661




      5,037143661






















          1 Answer
          1






          active

          oldest

          votes


















          2














          You need to bond the subpanel ground bus to the plumbing



          You will need to run a bonding conductor from the subpanel ground bus to a grounding clamp on the plumbing, as per NEC 250.104(A)(3):




          (3) Multiple Buildings or Structures Supplied by a Feeder(s) or
          Branch Circuit(s). The metal water piping system(s) installed
          in or attached to a building or structure shall be bonded to any
          of the following:



          (1) Building or structure disconnecting means enclosure
          where located at the building or structure



          (2) Equipment grounding conductor run with the supply
          conductors



          (3) One or more grounding electrodes used



          The bonding jumper(s) shall be sized in accordance with
          Table 250.102(C)(1), based on the size of the feeder or branch-circuit conductors that supply the building or structure. The
          bonding jumper shall not be required to be larger than the
          largest ungrounded feeder or branch-circuit conductor supplying the building or structure.




          This ensures that if the plumbing somehow became energized, the breaker would trip and disconnect the fault, instead of leaving the plumbing floating off to shocking voltages.



          Don't worry about parallel paths here



          As long as you have one and only one neutral-ground bond, located at the main service entrance, you are safe from parallel-path problems. Since ground wires don't normally carry current, they are free to run in parallel with each other, metal plumbing systems, metallic structural elements, and so on.






          share|improve this answer

























            Your Answer








            StackExchange.ready(function() {
            var channelOptions = {
            tags: "".split(" "),
            id: "73"
            };
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function() {
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled) {
            StackExchange.using("snippets", function() {
            createEditor();
            });
            }
            else {
            createEditor();
            }
            });

            function createEditor() {
            StackExchange.prepareEditor({
            heartbeatType: 'answer',
            autoActivateHeartbeat: false,
            convertImagesToLinks: false,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: null,
            bindNavPrevention: true,
            postfix: "",
            imageUploader: {
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            },
            noCode: true, onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            });


            }
            });














            draft saved

            draft discarded


















            StackExchange.ready(
            function () {
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdiy.stackexchange.com%2fquestions%2f155318%2fshould-i-bond-pipes-to-ground-in-detached-building-subpanel%23new-answer', 'question_page');
            }
            );

            Post as a guest















            Required, but never shown

























            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            You need to bond the subpanel ground bus to the plumbing



            You will need to run a bonding conductor from the subpanel ground bus to a grounding clamp on the plumbing, as per NEC 250.104(A)(3):




            (3) Multiple Buildings or Structures Supplied by a Feeder(s) or
            Branch Circuit(s). The metal water piping system(s) installed
            in or attached to a building or structure shall be bonded to any
            of the following:



            (1) Building or structure disconnecting means enclosure
            where located at the building or structure



            (2) Equipment grounding conductor run with the supply
            conductors



            (3) One or more grounding electrodes used



            The bonding jumper(s) shall be sized in accordance with
            Table 250.102(C)(1), based on the size of the feeder or branch-circuit conductors that supply the building or structure. The
            bonding jumper shall not be required to be larger than the
            largest ungrounded feeder or branch-circuit conductor supplying the building or structure.




            This ensures that if the plumbing somehow became energized, the breaker would trip and disconnect the fault, instead of leaving the plumbing floating off to shocking voltages.



            Don't worry about parallel paths here



            As long as you have one and only one neutral-ground bond, located at the main service entrance, you are safe from parallel-path problems. Since ground wires don't normally carry current, they are free to run in parallel with each other, metal plumbing systems, metallic structural elements, and so on.






            share|improve this answer






























              2














              You need to bond the subpanel ground bus to the plumbing



              You will need to run a bonding conductor from the subpanel ground bus to a grounding clamp on the plumbing, as per NEC 250.104(A)(3):




              (3) Multiple Buildings or Structures Supplied by a Feeder(s) or
              Branch Circuit(s). The metal water piping system(s) installed
              in or attached to a building or structure shall be bonded to any
              of the following:



              (1) Building or structure disconnecting means enclosure
              where located at the building or structure



              (2) Equipment grounding conductor run with the supply
              conductors



              (3) One or more grounding electrodes used



              The bonding jumper(s) shall be sized in accordance with
              Table 250.102(C)(1), based on the size of the feeder or branch-circuit conductors that supply the building or structure. The
              bonding jumper shall not be required to be larger than the
              largest ungrounded feeder or branch-circuit conductor supplying the building or structure.




              This ensures that if the plumbing somehow became energized, the breaker would trip and disconnect the fault, instead of leaving the plumbing floating off to shocking voltages.



              Don't worry about parallel paths here



              As long as you have one and only one neutral-ground bond, located at the main service entrance, you are safe from parallel-path problems. Since ground wires don't normally carry current, they are free to run in parallel with each other, metal plumbing systems, metallic structural elements, and so on.






              share|improve this answer




























                2












                2








                2







                You need to bond the subpanel ground bus to the plumbing



                You will need to run a bonding conductor from the subpanel ground bus to a grounding clamp on the plumbing, as per NEC 250.104(A)(3):




                (3) Multiple Buildings or Structures Supplied by a Feeder(s) or
                Branch Circuit(s). The metal water piping system(s) installed
                in or attached to a building or structure shall be bonded to any
                of the following:



                (1) Building or structure disconnecting means enclosure
                where located at the building or structure



                (2) Equipment grounding conductor run with the supply
                conductors



                (3) One or more grounding electrodes used



                The bonding jumper(s) shall be sized in accordance with
                Table 250.102(C)(1), based on the size of the feeder or branch-circuit conductors that supply the building or structure. The
                bonding jumper shall not be required to be larger than the
                largest ungrounded feeder or branch-circuit conductor supplying the building or structure.




                This ensures that if the plumbing somehow became energized, the breaker would trip and disconnect the fault, instead of leaving the plumbing floating off to shocking voltages.



                Don't worry about parallel paths here



                As long as you have one and only one neutral-ground bond, located at the main service entrance, you are safe from parallel-path problems. Since ground wires don't normally carry current, they are free to run in parallel with each other, metal plumbing systems, metallic structural elements, and so on.






                share|improve this answer















                You need to bond the subpanel ground bus to the plumbing



                You will need to run a bonding conductor from the subpanel ground bus to a grounding clamp on the plumbing, as per NEC 250.104(A)(3):




                (3) Multiple Buildings or Structures Supplied by a Feeder(s) or
                Branch Circuit(s). The metal water piping system(s) installed
                in or attached to a building or structure shall be bonded to any
                of the following:



                (1) Building or structure disconnecting means enclosure
                where located at the building or structure



                (2) Equipment grounding conductor run with the supply
                conductors



                (3) One or more grounding electrodes used



                The bonding jumper(s) shall be sized in accordance with
                Table 250.102(C)(1), based on the size of the feeder or branch-circuit conductors that supply the building or structure. The
                bonding jumper shall not be required to be larger than the
                largest ungrounded feeder or branch-circuit conductor supplying the building or structure.




                This ensures that if the plumbing somehow became energized, the breaker would trip and disconnect the fault, instead of leaving the plumbing floating off to shocking voltages.



                Don't worry about parallel paths here



                As long as you have one and only one neutral-ground bond, located at the main service entrance, you are safe from parallel-path problems. Since ground wires don't normally carry current, they are free to run in parallel with each other, metal plumbing systems, metallic structural elements, and so on.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 3 hours ago

























                answered 3 hours ago









                ThreePhaseEelThreePhaseEel

                30.7k114891




                30.7k114891






























                    draft saved

                    draft discarded




















































                    Thanks for contributing an answer to Home Improvement Stack Exchange!


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid …



                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.


                    To learn more, see our tips on writing great answers.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function () {
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fdiy.stackexchange.com%2fquestions%2f155318%2fshould-i-bond-pipes-to-ground-in-detached-building-subpanel%23new-answer', 'question_page');
                    }
                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    -

                    Popular posts from this blog

                    Fluorita

                    Image
                    Fluorita Fluorita (blau) amb pirita (daurat). Fórmula química CaF 2 Epònim fluor Localitat tipus Jáchymov Classificació Categoria Halurs Nickel-Strunz 10a ed. 3.AB.25 Nickel-Strunz 9a ed. 3.AB.25 Nickel-Strunz 8a ed. III/A.08 Dana 9.2.1.1 Heys 8.4.7 Propietats Sistema cristal·lí Cúbic Hàbit cristal·lí Sol presentar cubs; menys freqüentment dodecaedres. De vegades hexaoctaedres i tetrahexaedres. Per la combinació d'aquestes formes, les arestes dels cubs són sovint modificades. De vegades els cristalls poden presentar diferències de creixement entre les cares. Sovint s'observen cristalls compostos per sobrecreixement. Pot ser massiva, compacta, terrosa, columnar (poc freqüent), globular en agregats o botroïdal. Estructura cristal·lina a = 5.4626Å Simetria Classe (H-M): m 3 m (4/ m 3 2/ m ) - Hexoctaèdric; Grup espacial: Fm 3 m Color Blanc, groc, verd, violeta, vermell, rosa, blau o negre Mac...
                    Read more

                    Hulsita

                    Image
                    Hulsita Hulsita de la localitat tipus Fórmula química Fe 2+ 2 Fe 3+ O 2 BO 3 Epònim Alfred Hulse Brooks Localitat tipus mont Brooks, península de Seward, Nome Borough, Alaska, Estats Units Classificació Categoria borats Nickel-Strunz 10a ed. 6.AB.45 Nickel-Strunz 9a ed. 6.AB.45 Nickel-Strunz 8a ed. V/G.03 Dana 24.2.3.1 Heys 9.6.4 Propietats Sistema cristal·lí monoclínic Estructura cristal·lina a = 10,68Å; b = 3,09Å; c = 5,43Å; β = 94,15° Color negre Macles en [001]; un membre de la macla es troba girat 120° en relació a l'altre Exfoliació bona en {110} Duresa 3 Lluïssor vítria, submetàl·lica Densitat 4,28 g/cm 3 (mesurada); Més informació Estatus IMA mineral heretat (G) i mineral heretat (G) Any d'aprovació 1908 Referències [1] La hulsita és un mineral de la classe dels borats, que pertany al grup de la pinakiolita. Rep el seu nom en honor del nord-americà ...
                    Read more

                    Península de Txukotka

                    Image
                    Península de Txukotka Tipus Península Ubicació 66° N, 172° O  /  66°N , 172°O  / 66; -172 Mar mar dels Txuktxis La península de Txukotka a l'extrem oriental de Sibèria La península de Txukotka o península dels Txuktxis (en rus Чуко́тский полуо́стров , Txukotski poluóstrov ) és una península que es troba a l'extrem oriental d'Euràsia. Contingut 1 Descripció 2 Població 3 Vegeu també 4 Bibliografia Descripció L'estret de Bering, entre la península de Txukotka i la península de Seward a Alaska Foto de satèl·lit de la zona amb la península de Txukotka a l'esquerra El seu punt més extrem és el cap Dezhnev a la vora del nucli d'Uelen, un dels poquíssims llocs habitats de la zona. Al nord limita amb el mar dels Txuktxis i amb el mar de Bering al sud i amb l'estret de Bering a l'est. A la costa sud es troben la badia de Sant Lawrence i la badia de Kresta. La penínsu...
                    Read more