This first picture was not clear and all seemed to presume that we were seeing two "One PAIR" cables.
and
(it appears) that the Black insulated conductor has been "cut off".
(Of course, it could be the Red insulated conductor of the other (Pair) cable !?!?!
If the screws in the Terminal Strip are connected to the conductors and not just to the insulation, using a Multi-Meter it will be possible to determine which is the incoming Line and which are the conductors to the luminaires, provided that the lamps in the luminaires are functioning.)
The picture below shows the Red "Link" connecting terminal A (common) to Terminal B1.
(If you enlarge the picture you can see the broken conductor at Terminal B2).
Hence, the Red insulated and Black insulated conductors in the other cable go each to the two separate lights.
They would have been connected to terminals A1 and B (Common) respectively.
Of course, this WILL work.
However,
I would consider it preferable to
move one end of the Red "link" from Terminal B1 to Terminal B (common),
connect the single Red insulated conductor to this terminal (or to A (common))
and
connect the Red insulated and Black insulated conductors of the other (Pair) cable to Terminals A1 and B1 respectively.
This picture below shows one "One PAIR" cable in use and another "One PAIR" cable of which only the Red insulated conductor is in use
and
(it appears) that the Black insulated conductor has been "cut off".
Hence it is likely that the single Red insulated conductor is the Line coming into the pair of switches.
(Of course, it could be the Red insulated conductor of the other (Pair) cable !?!?!
If the screws in the Terminal Strip are connected to the conductors and not just to the insulation, using a Multi-Meter it will be possible to determine which is the incoming Line and which are the conductors to the luminaires, provided that the lamps in the luminaires are functioning.)
The picture below shows the Red "Link" connecting terminal A (common) to Terminal B1.
(If you enlarge the picture you can see the broken conductor at Terminal B2).
Hence, the Red insulated and Black insulated conductors in the other cable go each to the two separate lights.
They would have been connected to terminals A1 and B (Common) respectively.
Of course, this WILL work.
However,
I would consider it preferable to
move one end of the Red "link" from Terminal B1 to Terminal B (common),
connect the single Red insulated conductor to this terminal (or to A (common))
and
connect the Red insulated and Black insulated conductors of the other (Pair) cable to Terminals A1 and B1 respectively.
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