It is not a 2 gang switch - it is just a single grid switch module. It is an intermediate switch with four terminals. In one switch position the bottom terminals will be connected to the top ones directly above, in the other they will be connected to the top terminals on the other side. So basically they are designed to pass through two connections directly, or swap them over.
(still not sure why the bottom left red seems to be poking in the screw hole!)
He's sent me another pic - not sure if it helps:
So it's wired to work as a single-pole changeover, with the lower, single red pin 1 acting as the common, and the other side 1 and 2 acting as the NO and NC.
The black to 1 and red to 2 at the top go to the NO and NC of the other end changeover switch.
The red on the lower 1 goes to the common on the other end switch.
The brown on the upper 2 is the mains in.
The other black wire loops to the blue neutral of the mains in.
So at the other end the load is connected between the black on the upper
1 NO connection and the looped up neutral.I think that works!
nib
The brown is the mains in.
The brown to 2 is the feed to the lamp or the mains power in, either is possible depending on which end the lamp is and which end the live feed is taken.
nib
Like this (apols for the rotation!)?
nib
Well it explains the odd placement of the bottom wire - the terminal screw is not where I expected it to be :-)
Thanks for that - excellent. I'll have a closer look at the circuit.
To clarify, the diagram shows one possibility. Another, as I said above, is that where I've shown mains in could be the lamp and where I've shown the lamp could be the mains in.
nib
Grand, thanks, I'll use it cautiously. It's a good start for me to work out what's going on!
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