Shelly 1L - UK 2 Way Switch (3 Wires in each switch + earth)

  • Hello All,


    I am not sure about forum etiquette, so apologies if i have posted in the wrong place but i thought it would probably be best to start a new thread for this.


    I have purchased the Shelly 1L and Bypass for a 2 Way Switch, single light, setup and have fitted the bypass without issue. However, the wiring in both switches are as shown in the attached image and I have wired in the shelly 1L as suggested by Dimitar Dimitrov, and shown in the image below. Sadly though, at this stage all I can do is turn the light on/off via the shelly and the switch it shares a wall box with. If I then flick the other switch on/off it cuts power to the shelly and the switch in the wall box with the shelly.


    Unfortunately i do not know the circuit is wired in the walls, all I know is what i have posted above and that, before installing the Shelly, both lights would alter the state the light was in when flicked - regardless of the current state of the other switch or the light itself.


    Any help/insight here would be appreciated. All I can think of is that the light itself might be in between the two switches in the circuit and that putting a Shelly 1 in the ceiling with the light might work. However, I have the Shelly 1L already and would prefer to find a solution that utilises that if possible.


    Thank you all in advance and i look forward to hearing your suggestions.


    3.jpg121608592_10223062174765328_8405005797072479911_o.jpg

  • Go to Best Answer
  • Hello, thank you very much for your message and willingness to help out.


    I have prepared a wiring diagram showing the switches and the lamp as best I can as I do not know how the circuit is laid out in the walls and celling. The original circuit contains Switch A, Switch B and the Lamp. Switch C is a switch for another lamp in a separate room, but I have included it in this diagram as it shares a wall box with Switch B. This diagram is as follows:

    existing wiring.png


    Photograph of Switch A before installation of Shelly device:

    Switch A.jpg


    Photograph of Switches B and C before Shelly device installation:

    Switch B + C.jpg


    I had attempted to install the Shelly 1L at the same location as Switch A, leaving the wiring as it was in the wall box for Switches B + C. I have since uninstalled the Shelly and so have not got a photograph of the device installed. However, the diagram below shows how I intergrated it with the existing circuit:


    shelly wiring.png


    Looking forward to hearing back from you and thank you in advance for your assistance.

  • My apologies for the delay between my responses, I have been at work.


    I have done some investigating and it would appear that the Live wire is coming in to Switch A and the Switch Live wire is from Switch B. However, I need to mention that the diagrams I have sent have Switch C and B labels mixed up. The switch labelled Switch C is what I have been referring to as Switch B in our conversations (including above) and the switch labelled Switch B is what I have been referring to as Switch C. My apologies for this mix up.


    Thank you again. I hope this makes sense. Please let me know if you require any other information.

    • Best Answer

    all good, I'm working too and so you have waiting time too ?


    No problem.

    When I'm understanding all right

    It have to be so.

    SwitchA is the place where the shelly need to be fitted.

    (I'm now using this pic)

    16404-existing-wiring-png


    SwitchA

    Disconnect Com and put it at L from Shelly

    From Shelly O a wire at Com

    Disconnect L2 and put it in Com too

    Disconnect L1 and put it at SW2

    A wire from L1 or L2 to SW1


    Switch C

    (If it are the same Colors perhaps you need to check)

    Disconnect L2 and put it at Com too


    So it's nearly your second pic, only Switch C med there to be changed

  • I have just installed the Shelly with the method you describe and everything now works perfectly! Thank you very much for your help, it is greatly appreciated. I have marked your answer as "Best Answer" already but please let me know if there is any other protocol on the forum that I should follow as well. Thanks again!