3 Brown Wires In Light Switch. Refer to the illustrations below for doing the rough-in wiring for each of these situations. The other two are simple with a single grey cable fitting.
If there is a light switch then the brown is switched-live, as such you could use the shelly but you would have to leave the light switch in the on If so where do I begin any help greatly appreciated.
Most smart light switches require a ground wire, an "in" wire, an "out" wire, and a neutral wire.
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Instead of turning lights on or off, control a wide range of lighting and create more ambiance in your home by installing a dimmer switch. Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the top and bottom of a flight of stairs or at two different entrances to a room. So, retracing my steps I detach all the light fitting paraphernalia and just try it with the three brown/live wires bound together (as should be standard according to the diagram) and still.