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2 gang, 1 way wiring explanation please - Shelly 2.5

Discussion in 'Electrics UK' started by mtomlin, 12 Jan 2021.

  1. mtomlin

    mtomlin

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    Hello, can someone help me understand what is going on here please with this wiring. Its a 2 gang, 1 way switch - but has more wires than I expected.
    AB628143-B890-4502-8C05-31596B9D944D.jpeg 6C693F12-E852-4AC3-B0B1-A317CDA39372.jpeg

    Having done a lot of research I cannot easily make sense of it

    The reason I ask is that I wish to install a Shelly 2.5 like this:

    [​IMG] .

    Many thanks!
     
    Last edited: 12 Jan 2021
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  3. AndyPRK

    AndyPRK

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    So these switches control 4 separate lights ?

    Bottom wires look like permeant live

    Top to lights I would think
     
  4. mtomlin

    mtomlin

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    So that’s the thing. They control two sets of LEDs only, not four. That’s why I can’t understand the need for the four in the COM terminals.

    Ive reached the same conclusion as my other post- that they have been wired with perm live to L1 and lights from COM.

    Any ideas?
     
  5. EFLImpudence

    EFLImpudence

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    Yes, the two wires with the link are bound to be the permanent live in and out.
     
  6. plugwash

    plugwash

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    What do you mean by a "set" though? is it possible that what you are thinking of as a "set" is actually two seperate sets controlled from the same switch?

    Yeah.

    From my reading of the instructions it seems like the Shelly 2.5 is designed to sit in the box behind an electrical accessory.

    The good news is it looks like you have all the wires you need. In particular it looks like you have the neutral available at your light switch location which many UK switches don't

    The not so good news is I doubt you will have enough space for all the nessacery wiring inside that box. Even if you replace the box with a 47mm one (the deepest available) I would expect it to be quite a squeeze.
     
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  8. mtomlin

    mtomlin

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    By 'set' I mean the following: one of the light switches controls 6 of the 12 LEDs in the room - all at once. Ie when the switch is flicked all 6 come on. And the other switch controls the other 6 of the 12 in the same way. Ie when its flicked they all come on.

    I think you may be correct. There may be some wiggle room - i need to check. If there isn't, what are your thoughts on putting two Shelly 1s at the light end of the circuit - ie in the roof above one of the LEDs in each set. Have you seen that done? Ive taken a look and have live brown and neutral blue in and out from each light, with earth terminating on the LED fitting. Ive seen you can put a Shelly 1 on a pendant, but not seen it work in a series set of LEDs.
     
  9. EFLImpudence

    EFLImpudence

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    Could the four wires operate three lights each? Take out one wire and see what happens.

    If that is the case it might make fitting the Shelly in the ceiling more of a problem.


    It's just two switches.
     
  10. mtomlin

    mtomlin

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    Arh, I see what you mean - if the four wires control three lights each, then id need 4 Shelly 1s! Ill need to check tomorrow. Ill have a look, thank you.
     
  11. plugwash

    plugwash

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    To incorporate the shelly, you need access to permanent live power, switched live and neutral. In your particular set-up, the place where you have all three of those things is the switch box. The shelly also needs to be inside a suitable enclosure as it has no wire management space or terminal covers of it's own and it needs to be accessible for maintainance.

    Personally, assuming the roof space above the switch location is reasonably accessible I suspect your best bet would be to mount a box there to put the shelly in.
     
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