Shelly 1L: how to wire with 2 switches

  • Hi, correct me if I am wrong but it seems that you'd like to add Shelly 1L to your existing "alternative" circuit, right?

    The way I did is that exactly as described in the manual, which means that I re-wired the whole thing. Do not worry, you have the right amount of cables in your wall already, you just need to wire them on a different way. First disconnect all the wires from the switches. Put your 1L to that switch where you have the "L" wire and connect it to your Shelly. Use the existing cables to re-wire the connection between the switches. You have two red wires I assume for the alternative circuit. Check and mark the same ends (same wire). Use one of them to connect the farther switch to your shelly, and use the other one as the output to your lamp.


    original.png

    figure 1. Original alternative circuit



    new.png

    figure 2. New circuit


    p.s. sorry about the IC :)


    JdM

  • According to this "new" wiring diagram (figure 2) you would need 4 cables where the Switch A is located but there are only 3 wires (as per figure 1). Simply there is no direct cable from Switch A to the lamp. Do I read it right?

  • Johnydemarco

    After analysing the situation the only possible solution that comes to my mind is as per below diagram:

    pasted-from-clipboard.png

    the assumption here is though that the SW1 and SW2 inputs can accept the hot input (from L line). Not sure if Shelly 1L supports that. In here you can keep the existing 2-way switches but only 1 output is connected (to the SW1 and SW2 accordingly). What do you think?

  • Hi All,


    yes, theoretically you need 4 wires, but:

    - 1 connects Switch A and Shelly locally, which is ~5cm long

    - 1 is the "L", it is there already

    - 1 is one of the wires between the two switches for "O"

    - 1 is the other wire between the two switches to connect farther switch and Shelly (than goes to lamp as common for "O")


    In nutshell: 3 wires + a small one have to be enough.


    adorobis: your wiring seems to be okay for me, too. However, I am not sure that Shelly accepts "hot" wire.

  • Btw:

    "

    - 1 connects Switch A and Shelly locally, which is ~5cm long

    - 1 is the "L", it is there already

    "

    That is the reason why you have to put the Shelly to the "L" side of the switches, I mean where "L" available directly.

  • The next challenge is to upgrade a double impulse switch circuit, as they are not connected directly to the lamp but to an impulse relay. Also, the relay needs a short impulse only (~0.5sec) so I have to figure out the right wiring and timing. It will be fun for sure :)


    JdM

  • Hi everyone!


    I've been struggling with adding a Shelly 1L to a circuit with 2 switches, exactly as the one above. I've done the wiring as per the diagram, but one of the switches always turned the shelly off together with the light, so I'm guessing that I probably didn't use the right switch box where the L wire is. I am planning to also try the other switch box tomorrow, but the issue is that I also have an internet cable passing through that box, so there's no way for me to fit the shelly in there, so I'm stuck with Box #1 (as per the last diagram). Is there any way to wire both switches in this case?

    For now, I've connected the Shelly traditionally, just for one of the switched, but of course, at this moment, turning the light off from the other switch will also turn off the relay together with the light and of course, I'll only be able to turn on the light from the same switch, which is very inconvenient. Any ideas?

  • Hi everyone!


    I've been struggling with adding a Shelly 1L to a circuit with 2 switches, exactly as the one above. I've done the wiring as per the diagram, but one of the switches always turned the shelly off together with the light, so I'm guessing that I probably didn't use the right switch box where the L wire is. I am planning to also try the other switch box tomorrow, but the issue is that I also have an internet cable passing through that box, so there's no way for me to fit the shelly in there, so I'm stuck with Box #1 (as per the last diagram). Is there any way to wire both switches in this case?

    For now, I've connected the Shelly traditionally, just for one of the switched, but of course, at this moment, turning the light off from the other switch will also turn off the relay together with the light and of course, I'll only be able to turn on the light from the same switch, which is very inconvenient. Any ideas?

    Can't you connect both to SW1? I never used Shelly1L but in shelly dimmer Sw1 is to increase and Sw2 to decrease brightness, but in different button modes only SW1 is used.