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    three way switch wiring

    in video he shows three different ways that the three ways can be wired you guys mostly wire it one way or varies often.

    https://youtu.be/_u5ORnhqn8g

    Sent from my SM-N960U using Tapatalk


    #2
    Outside of the non code compliant "Chicago" or "California three way setups, the wiring logic of three way/four way switching circuits is always the same. Start at one of the three way "common" terminals, run two "traveler" wires to the other three way and continue on to the load from the second three way "common" terminal. Insert how ever many four ways you want in the traveler wires between the two three way switches.

    What can vary is how you route cables and conductors depending on physical relationship between source, load and switching components. You use one method or another to use less copper or the installation but the logic of the switching still is the same when you break it down, and is easy to see if you draw it out in a ladder logic type diagram as it will be same diagram every time.
    I live for today, I'm just a day behind.

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      #3
      A true California 3 way is compliant as it never switches the neutral which is always connected to the shell of the light socket.
      It is wired with the hot wire connected to a traveler terminal in both switches and the load is connected to other traveler in both switches. The commons are connected together. The neutral is wired to the fixture neutral. It only requires 2 wires between the switches, the common to common conductor and the load conductor.


      As long as the neutral is is present in both switch boxes it is compliant.

      I would never use it because it confuses the hell out of me.

      Sent from my RCT6A03W13E using Tapatalk

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        #4
        Originally posted by rjniles View Post
        A true California 3 way is compliant as it never switches the neutral which is always connected to the shell of the light socket.
        It is wired with the hot wire connected to a traveler terminal in both switches and the load is connected to other traveler in both switches. The commons are connected together. The neutral is wired to the fixture neutral. It only requires 2 wires between the switches, the common to common conductor and the load conductor.


        As long as the neutral is is present in both switch boxes it is compliant.

        I would never use it because it confuses the hell out of me.

        Sent from my RCT6A03W13E using Tapatalk
        I followed your description and drew it on paper. It works, but it's a strange looking thing! Power to the load always flows on the link between the 2 commons.

        I think a lot of the confusion for 3 or 4 way switches is the number of variations depending on where the power comes from-- switch A, switch B, or at the light fixture.

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          #5
          I wonder if there's a California 4-way circuit? It seems like it would be difficult to do that with just a single traveller. With a normal configuration all of the switches are cascaded in series between the line and load, making it straightforward to extend it to more switches.

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            #6
            Originally posted by rjniles View Post
            A true California 3 way is compliant as it never switches the neutral which is always connected to the shell of the light socket.
            It is wired with the hot wire connected to a traveler terminal in both switches and the load is connected to other traveler in both switches. The commons are connected together. The neutral is wired to the fixture neutral. It only requires 2 wires between the switches, the common to common conductor and the load conductor.

            As long as the neutral is is present in both switch boxes it is compliant.
            The problem with the switching configuration is not polarity at the lampholder, but rather, that in certain switch positions conductor paralleling occurs. The common conductor gauges used in the common switching installation runs afoul of 2017 NEC 310.10(H)(1)

            Click image for larger version  Name:	2017NEC310_10_H_1Parallel Cond.JPG Views:	1 Size:	81.1 KB ID:	2545424
            Another Al in Minnesota

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              #7
              Originally posted by PaulMmn View Post
              Power to the load always flows on the link between the 2 commons.
              Except when the load is turned off.

              There are two switching states where the load is turned off. Only one of these states runs afoul of 310.10(H)(1). This one switching state puts the common to common conductor in parallel with the un-switched hot conductor that is connected at one traveler terminal on each three-way switch. Any downstream load connected to the un-switched hot and neutral will have its load current split between the hot and the common to common conductor.
              Another Al in Minnesota

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                #8
                Ignoring the California, there is only one way to wire a 3 way. The hot goes on one common, the load goes on the other. There are different ways to get to that arrangement.

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                  #9
                  Originally posted by rjniles View Post
                  Ignoring the California, there is only one way to wire a 3 way. The hot goes on one common, the load goes on the other. There are different ways to get to that arrangement.

                  Sent from my RCT6A03W13E using Tapatalk
                  I learned that as a second year apprentice.......

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                    #10
                    Originally posted by cdslotz View Post

                    I learned that as a second year apprentice.......
                    What were you doing the first year?😃

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                      #11
                      Originally posted by rjniles View Post
                      What were you doing the first year?😃

                      Sent from my RCT6A03W13E using Tapatalk
                      Typically it would have been which end of the shovel was down and learning what "I don't want to see anything but A&E!!" meant.
                      Tom
                      TBLO

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                        #12
                        Does anyone have an illustration of how a California 3-way would actually be installed with 2-conductor NM cable? The diagrams with hots and neutrals make sense, but I have a hard time envisioning the actual cabling layout. It seems like you'd have an extra conductor for at least part of the circuit if done with 2-wire cable.

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                          #13
                          Originally posted by Electromatic View Post
                          Does anyone have an illustration of how a California 3-way would actually be installed with 2-conductor NM cable?
                          Here ya go.

                          Click image for larger version

Name:	Two Wire Travelling Bus 3 Way.jpg
Views:	538
Size:	53.4 KB
ID:	2545650
                          Another Al in Minnesota

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                            #14
                            I thought that was a Carter 3W ....~S~

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                              #15
                              Originally posted by romex jockey View Post
                              I thought that was a Carter 3W ....~S~
                              I have always known the Carter as a three-way that reverses the lampholder polarity, depending upon the switch position.
                              Another Al in Minnesota

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