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    Meter Socket Grounding

    If you have a 240/120V, single-phase meter loop attached to a pole where it's overhead to overhead, with only the two phase wires (not the grounded conductor) coming down through the loop to the meter socket, then back up the loop from the meter socket, should, and how should, it be grounded?

    #2
    I'm assuming that the service disconnect is somewhere further down stream? The meter socket and the riser conduits must be bonded to the neutral conductor. I would use an appropriately sized bonding jumper at the weather head from the neutral to a ground clamp on the riser conduit.
    This sounds like a coop deal. Are they OK with this?

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      #3
      You can't? Usually if the neutral is present it needs to follow the phase leads as far as the service disconnect; off-hand I can't think of a relevant exception.

      I do recall years back someone telling me this was common practice on farms.

      Comment


        #4
        Originally posted by mobo View Post
        If you have a 240/120V, single-phase meter loop attached to a pole where it's overhead to overhead, with only the two phase wires (not the grounded conductor) coming down through the loop to the meter socket, then back up the loop from the meter socket, should, and how should, it be grounded?
        Do you own the meter loop or the POCO?

        If you own it, do it over and bring the grounded conductor down in the meter loop. It does not need to go back up.

        We can not have the line and load of that meter socket in the same raceway in this area. . The POCO does not supply up/down loops anymore. Only down, so a separate conduit back up for the load.
        Tom
        TBLO

        Comment


          #5
          By grounded you mean connection to a grounding electrode system? NEC does not require, POCO may require. In Wasington we can connect a GEC into the meter socket as its not accessible, however its allowed if the POCO requires.
          Moderator-Washington State
          Ancora Imparo

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            #6
            And our POCO won't allow meter loops either. First get a copy of your POCOs customer service handbook.
            Moderator-Washington State
            Ancora Imparo

            Comment


              #7
              Originally posted by texie View Post
              I'm assuming that the service disconnect is somewhere further down stream? The meter socket and the riser conduits must be bonded to the neutral conductor. I would use an appropriately sized bonding jumper at the weather head from the neutral to a ground clamp on the riser conduit.
              This sounds like a coop deal. Are they OK with this?
              Yes, the service disconnect is farther downstream.

              Comment


                #8
                Originally posted by zbang View Post
                You can't? Usually if the neutral is present it needs to follow the phase leads as far as the service disconnect; off-hand I can't think of a relevant exception.

                I do recall years back someone telling me this was common practice on farms.
                The loop has a #6 bare wire coming out of the meter socket and it is bonded to the pole ground. So wondering if this would be considered kosher as far as grounding?

                Comment


                  #9
                  Originally posted by ptonsparky View Post

                  Do you own the meter loop or the POCO?

                  If you own it, do it over and bring the grounded conductor down in the meter loop. It does not need to go back up.

                  We can not have the line and load of that meter socket in the same raceway in this area. . The POCO does not supply up/down loops anymore. Only down, so a separate conduit back up for the load.
                  POCO owns the loop.

                  What is the reason for not wanting the line and load in the same conduit?

                  Comment


                    #10
                    Originally posted by tom baker View Post
                    By grounded you mean connection to a grounding electrode system? NEC does not require, POCO may require. In Wasington we can connect a GEC into the meter socket as its not accessible, however its allowed if the POCO requires.
                    Yes, I meant grounding electrode system.

                    Comment


                      #11
                      This also got me thinking.....my brother has a service to an irrigation pump and it's a straight 3-wire, 3-phase service. No grounded conductor. I haven't looked at it yet, but how should that loop be grounded? It's about a 16 ft. loop with the meter socket on it.

                      Comment


                        #12
                        Originally posted by tom baker View Post
                        And our POCO won't allow meter loops either. First get a copy of your POCOs customer service handbook.
                        What's the reason/logic for not allowing loops?

                        Comment


                          #13
                          Originally posted by mobo View Post

                          The loop has a #6 bare wire coming out of the meter socket and it is bonded to the pole ground. So wondering if this would be considered kosher as far as grounding?
                          If the pole ground is tied to the neutral, this conductor would functionally tie the meter base to the neutral. Is the #6 large enough for the service size?
                          Master Electrician
                          Electrical Contractor
                          Richmond, VA

                          Comment


                            #14
                            Originally posted by mobo View Post

                            What's the reason/logic for not allowing loops?
                            Same reason meters are sealed. To prevent theft of power or in this case, a short between line and load. Keep in mind the POCO have a hundred years or more of providing power and have seen it all. The need to protect the cash register is paramount, so they write the rules. And the NEC does not require a meter.
                            Moderator-Washington State
                            Ancora Imparo

                            Comment


                              #15
                              Originally posted by mobo View Post
                              This also got me thinking.....my brother has a service to an irrigation pump and it's a straight 3-wire, 3-phase service. No grounded conductor. I haven't looked at it yet, but how should that loop be grounded? It's about a 16 ft. loop with the meter socket on it.
                              What type of three wire? 480 corner grounded?
                              Moderator-Washington State
                              Ancora Imparo

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