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"Six Throws" Grouping of Service Disconnects via (6) Inside 42 Circuit Load Centers

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    "Six Throws" Grouping of Service Disconnects via (6) Inside 42 Circuit Load Centers

    I am a little confused about the six throws rule for service disconnect. I do not believe that all throws must be in a single enclosure, but I am not sure if a grouping of Main Breaker Panels is acceptable. Below is the general setup:

    There will be six conductors/feeders that originate at the low side transformer and each conductor will land in a 600 amp Main Break Panel (each panel has ~42 circuits). These panels will be grouped inside and readily accessible (open the door and there they are on the back wall).

    The be clear, you can essentially stand in one place, open six doors, throw six breakers, and all power in the building is disconnected.

    Thanks!

    #2
    Is this not a continuation of a previous post about the Tap rule we recently discussed ?

    JAP>

    Comment


      #3
      Originally posted by cottora View Post
      I am a little confused about the six throws rule for service disconnect. I do not believe that all throws must be in a single enclosure, but I am not sure if a grouping of Main Breaker Panels is acceptable. Below is the general setup:

      There will be six conductors/feeders that originate at the low side transformer and each conductor will land in a 600 amp Main Break Panel (each panel has ~42 circuits). These panels will be grouped inside and readily accessible (open the door and there they are on the back wall).

      The be clear, you can essentially stand in one place, open six doors, throw six breakers, and all power in the building is disconnected.

      Thanks!
      This install is compliant and will be the only acceptable means when the 2020 Nec become rule. When 2020 nec comes into effect you will not be allowed to have 6 breakers in one panel as satisfying your 6 disconnect rule.
      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 jap View Post
        Is this not a continuation of a previous post about the Tap rule we recently discussed ?

        JAP>
        If need be I can move it there. But it is a totally different issue that is not contemplated in the previous post. That said, this business solution is derived from the knowledge of that post. Thanks

        Comment


          #5
          Are you sure you are talking about a service disconnect? In the NEC the Service Disconnect is a specific point and it is basically where the power company ends and the wiring inside the building starts?
          If Billy Idol is on your playlist go reevaluate your life.

          Comment


            #6
            Originally posted by ActionDave View Post
            Are you sure you are talking about a service disconnect? In the NEC the Service Disconnect is a specific point and it is basically where the power company ends and the wiring inside the building starts?
            Aren't you describing a service point? The "service disconnect" is quite often in a separate enclosure, fed by "service entrance conductors."

            Comment


              #7
              Originally posted by cottora View Post

              There will be six conductors/feeders that originate at the low side transformer and each conductor will land in a 600 amp Main Break Panel (each panel has ~42 circuits). These panels will be grouped inside and readily accessible (open the door and there they are on the back wall).
              So these breaker panels are all services?

              Rob

              Moderator

              All responses based on the 2017 NEC unless otherwise noted

              Comment


                #8
                I am not using the term Service Disconnect properly. The transformer is NOT owned by the Utility.

                Comment


                  #9
                  So the 6 panels are not service panels and do not contain the service disconnects? If that is true then the 6 throw rule is not applicable.
                  Rob

                  Moderator

                  All responses based on the 2017 NEC unless otherwise noted

                  Comment


                    #10
                    Originally posted by infinity View Post
                    So the 6 panels are not service panels and do not contain the service disconnects? If that is true then the 6 throw rule is not applicable.
                    That is correct. But I was under the belief that once you enter a building then you have to be able to cut power to such building within a prescribed way.

                    Comment


                      #11
                      Originally posted by Dennis Alwon View Post

                      This install is compliant and will be the only acceptable means when the 2020 Nec become rule. When 2020 nec comes into effect you will not be allowed to have 6 breakers in one panel as satisfying your 6 disconnect rule.
                      What is the reasoning for that?
                      Sometimes I don't know whether I'm the boxer or the bag.

                      Comment


                        #12
                        Originally posted by infinity View Post
                        So the 6 panels are not service panels and do not contain the service disconnects? If that is true then the 6 throw rule is not applicable.
                        6 throw rule still applies to the main disconnecting means of a building even if not service supplied.

                        His problem in that other thread is the need to land the taps at a single overcurrent device to comply with tap rules.
                        I live for today, I'm just a day behind.

                        Comment


                          #13
                          Originally posted by qcroanoke View Post

                          What is the reasoning for that?
                          My guess, they decided they don't want people working in the enclosure that has live parts even with the main(s) off. Kind of lining up to some extent with 70E, though if it is critical to comply with 70E then maybe people were designing accordingly anyway.
                          I live for today, I'm just a day behind.

                          Comment


                            #14
                            I have to say, I've never witnessed a service or a feeder to a building that was set up as (6) individual 600 amp Main Breaker 42 circuit panels grouped together as the disconnect.

                            Seems odd, but, to each his own.

                            JAP>

                            Comment


                              #15
                              Originally posted by jap View Post
                              I have to say, I've never witnessed a service or a feeder to a building that was set up as (6) individual 600 amp Main Breaker 42 circuit panels grouped together as the disconnect.

                              Seems odd, but, to each his own.

                              JAP>
                              For more background...This will be a bitcoin mining container (40 feet in length). So the six panels will land the conductors from the transformer and then these panels will branch off to feed ~1,000 outlets running down multiple rows of shelves. Each duplex outlet will be 208v with a 20 amp breaker from said panel. The outlets quad boxes will be fairly close together and running the length of the container on at least three rows.

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