Shelly Dimmer 2 - Wiring with two way switches and without neutral

  • Hi,


    I would like to install the [product]Shelly Dimmer 2[/product] :

    1. behind two way swiches (2 interrupteurs va-et-viens in French ;)).
    2. without neutral.

    You could find current wiring diagram in hereafter.


    I searched everywhere (shelly docs, forums....), and i did not find how to wire the dimmer in such a configuration. Is it possible (certainly with ByPass) ? what is the wiring diagram ? where i can find it ?


    Thanks in advance,

    Fabrice


    ShellyD2_WiringDiagram.png

  • Edit: See the next post for an easier way than described in this post.



    If you change the 2 way switches to regular 1 way than you can use the existing two wires between them to send L from the Switch 1 location to the Switch 2 location.

    And the L' going from the Switch 2 location to the Switch 1 location.


    This would give you the possibility to add a Dimmer 2 at the Switch 2 location.


    No the part I don't know if it is possible is a adding a second device because they would both use the same bypass.

    If it is possible than you can add a 1L at the Switch 1 location as you now have both L and L' at that location too.


    The 1L would get the switch input and would execute an API HTTP request (configurable under Actions) to the Dimmer 2 and hence controlling the light.

    Edited once, last by torusJKL ().

  • There might be an even easier way.


    Like with the previous solution use regular 1 way switches at both locations.

    Use 1 wire between the locations to forward L from location 1 to location 2.


    And use the other wire as the output from the switch in location 1 and connect it together with the output of the switch in location 2 to the SW1 input of the Dimmer 2 that is also located at location 2.


    See attached diagram.

  • Thanks it's work :thumbup:! ...

    ...

    except that I plugged in a halogen of more than 250w, which put the dimmer in overload....

    I just have to change the bulb ;)

  • Hello,


    How should i connect these types of switches with the shelly dimmer 2?


    I want to use Livolo two-way touch switches. Schematics in the first picture.


    And i think the wiring is the one in the second picture. (schneider two-way switches)


    Problem is i have the live wire going to one location and the live wire for the bulb in the second location. I also have two wires that go from first switch to the second one. And the dimmer should be in the second location, i guess.

    Schema%20electrica%20intrerupator%20cap%20scara%20701s.jpgdiagrama-intrerupator-cap-scara.jpg

  • I don't have 3 wires between the switches but i can use the live wire from another switch in one location.


    Does Shelly dimmer 2 need the L wire to go to the switches and than to SW1, or it is just a simple live wire?


    The switches are advertised as no-neutral and they use the same approach as Shelly Dimmer 2.

    Edited 3 times, last by andutgv ().

  • Hi,

    i have used this diagram with standard switches and choosing edge type button. The problem is that i can operate the switch only from one location at the time: if I switch on from one location i need to switch of from the same location since from the other one is not working) torusJKL can you help me?

    thank you so much

  • I don't have 3 wires between the switches but i can use the live wire from another switch in one location.


    Does Shelly dimmer 2 need the L wire to go to the switches and than to SW1, or it is just a simple live wire?


    The switches are advertised as no-neutral and they use the same approach as Shelly Dimmer 2.

    I think you should only use the live wire from another switch if it is on the same fuse.


    You can either connect the switch to L from the Shelly and than back to SW1 or you can split L and connect one cable to the Shelly and one directly to the switch.


    If your switch doesn't have a lamp than it doesn't need neutral.
    This is normaly the case.
    But maybe your touch switches are different.

  • Hi,

    i have used this diagram with standard switches and choosing edge type button. The problem is that i can operate the switch only from one location at the time: if I switch on from one location i need to switch of from the same location since from the other one is not working) torusJKL can you help me?

    thank you so much

    Can you sketch a schema how you connected everything?
    Handwritten is fine too.

  • The issue seems to be that you use two 1-way switches.

    Once SW1 is on than no matter what you do with SW2 it will always provide power to the SW1 input on the Shelly.

    You need to either use 2-way switches or push buttons.
    With 2 way switches you would need 2 cables between the two switches so this might not be possible in your home.

  • The issue seems to be that you use two 1-way switches.

    Once SW1 is on than no matter what you do with SW2 it will always provide power to the SW1 input on the Shelly.

    You need to either use 2-way switches or push buttons.
    With 2 way switches you would need 2 cables between the two switches so this might not be possible in your home.

    torusJKL this is possible. how should i connect them? can you show a scheme please?

  • I went with the no-neutral and two way switch and works great. Thankfully I had a live wire in both locations which simplified matters alot. Otherwise I would use the push button in both locations.


    Here's my two-way switch wiring, with button type "Toggle Switch one button" configured in the Dimmer.

    Files

    • shelly.png

      (37.17 kB, downloaded 5 times, last: )

    Edited once, last by tfi_friday ().

  • tfi_friday I just tried your solution (two way switches) but with the neutral wired, and when I tried to toggle my dimmer through the app it broke at my electrical panel.


    Edit: Ok I think my issue is I used a L wire from another circuit breaker.

    But how to manage to to put my dimmer in one of the two locations when I only have 3 wires in each (2 wires between the switches, on one side the L, on the other the wire to the light bulb) and the neutral?

    Edited once, last by viish ().

  • viish It's a very different circuit if you are running neutral.


    Instead of the Live in to the 2-way switch at Location 2 I believe it should be the neutral.


    Ignore that I just looked at the manual, looks like it can be either neutral or live. Are you sure the wiring is correct?