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    suspended ground rod

    I am doing work in Bermuda and the local contractor is telling us that a ground rod connected to a grounding electrode conductor and suspended in an 8" x 10' bored well/hole is how they are required to install ground rods?
    The attached file is a copy of the installation instructions?
    I have never seen the installation of ground rods suspended in salt water, and of course I have not found anything in the NEC that seems to allow such an installation?
    Has anyone seen this?Gnd Well Detail detail (1).pdf

    #2
    Originally posted by wbwald View Post
    I am doing work in Bermuda and the local contractor is telling us that a ground rod connected to a grounding electrode conductor and suspended in an 8" x 10' bored well/hole is how they are required to install ground rods?
    The attached file is a copy of the installation instructions?
    I have never seen the installation of ground rods suspended in salt water, and of course I have not found anything in the NEC that seems to allow such an installation?
    Has anyone seen this?[ATTACH=CONFIG]14673[/ATTACH]
    Seems like having the PVC sleeve for a well casing would create a capacitor out of it. Might still be a better electrode then a rod driven in desert sand though, as long as the well never goes dry.
    I live for today, I'm just a day behind.

    Comment


      #3
      Originally posted by wbwald View Post
      I am doing work in Bermuda and the local contractor is telling us that a ground rod connected to a grounding electrode conductor and suspended in an 8" x 10' bored well/hole is how they are required to install ground rods?
      The attached file is a copy of the installation instructions?
      I have never seen the installation of ground rods suspended in salt water, and of course I have not found anything in the NEC that seems to allow such an installation?
      Has anyone seen this?[ATTACH=CONFIG]14673[/ATTACH]
      I doubt you will find that the code prohibits such a thing. It just would not count as a GE in the US.

      Maybe this is a floating building of some sort.

      Personally, I would be real suspicious of installing a copper wire in salt water.
      Bob

      Comment


        #4
        where would you find a 2" dia x 10' cu ground rod -- 4/0 cu for the conductor size? thats alot of pennies (pre 1980 of course)
        CircuitRyder --- Unfortunately not all good ideas are code enforceable.

        Comment


          #5
          Originally posted by mwm1752 View Post
          where would you find a 2" dia x 10' cu ground rod -- 4/0 cu for the conductor size? thats alot of pennies (pre 1980 of course)
          That must weigh quite a bit. Is it just supposed to hang off the 4/0 conductor? Notice the drawing shows the bottom of the rod 3' above the bottom of the tube.

          I am also interested in how one would get the 4/0 into the 1" PVC coming out of the side of the tube.
          Cheers and Stay Safe,

          Marky the Sparky

          Comment


            #6
            Is this area under the NEC?
            Moderator-Washington State
            Ancora Imparo

            Comment


              #7
              Originally posted by tom baker View Post
              Is this area under the NEC?
              OP said Bermuda and Bermuda adopts the NEC.

              http://www.planning.gov.bm/BuildingCodes.aspx
              [COLOR="blue"]"Electricity is really just organized lightning." George Carlin


              Derek[/COLOR]

              Comment


                #8
                Specification #4 says to use ten feet of two-inch copper pipe.

                Comment


                  #9
                  Originally posted by jumper View Post
                  OP said Bermuda and Bermuda adopts the NEC.

                  http://www.planning.gov.bm/BuildingCodes.aspx


                  But you will have to wonder on there inspections , if any .



                  Don

                  Comment


                    #10
                    I have a similar system

                    I see 20 callouts with none aligning with the provided drawing. it's kind of hard to make a call here with a very small part of the overall picture.

                    Is the drawing for the grounding electrode or "ground bus in computer room" (supplemental)?

                    The drawing does not necessarily infer that this is dangling in water. I have several ground wells in my facility which are very similar. The water table intrudes a lot from time to time and in order to prevent shifting of the soil which would cover the top of the ground rods (rendering them not visible to inspection) they are driven deep into the soil, well into the water table. Your draftsman needs to be more specific to the engineer's requirements. I would expect to see some type of hatching interior to the PVC well to indicate fill.

                    The low water level in your example would ensure that the ground rod met resistance requirements reliably.

                    As far as the "mechanically fastened" part, I would change that to a brazed. Again, that is how all of mine are. I have two fields (5 and 7 rods each) which are installed in similar fashion.
                    Attached Files
                    Kirchoff and Ohm...the only laws that make sense

                    Comment


                      #11
                      There is a company that sells a similar type grounding electrode made of copper tube, I can't remember the name of the company, they were used on a pump station, 480V supply.
                      I don't see the advantage for the typical electrical service, but for telecom sites with lightning, that could be an application
                      Moderator-Washington State
                      Ancora Imparo

                      Comment


                        #12
                        Originally posted by wbwald View Post
                        I am doing work in Bermuda and the local contractor is telling us that a ground rod connected to a grounding electrode conductor and suspended in an 8" x 10' bored well/hole is how they are required to install ground rods?
                        The attached file is a copy of the installation instructions?
                        I have never seen the installation of ground rods suspended in salt water, and of course I have not found anything in the NEC that seems to allow such an installation?
                        Has anyone seen this?[ATTACH=CONFIG]14673[/ATTACH]
                        i've seen a forestry lookout station that had extensive lighting rod systems
                        have something similar, and the lookout would pour a pail of water in to
                        soak the ground rod before a lightning storm.

                        never a service ground, tho....
                        ~New signature under construction.~
                        ~~~~Please excuse the mess.~~~~

                        Comment


                          #13
                          Erico makes a copper tube ground "rod", its intended to be filled with GEM which is ground enhancement material..
                          Moderator-Washington State
                          Ancora Imparo

                          Comment


                            #14
                            Originally posted by tom baker View Post
                            Erico makes a copper tube ground "rod", its intended to be filled with GEM which is ground enhancement material..
                            It has small perforations to let the GEM leak out slowly? Or is it just magic?

                            Comment


                              #15
                              This will act as a pipe bomb when lightning strikes -- the mega watts energy might vaporize the small liquid in a sealed chamber in a short time, creates an explosion propelling the rod straight up to the moon.

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