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Cant understand wiring on old light switch

Postby midders » Fri Jul 31, 2020 5:11 pm

I wanted to make a straight swap of an old light switch.
This is a 1 gang 1 way switch. I can't understand why it has 2 Comms slots and just a yellow into the L1 slot. See 2 pics.
My replacement switch only has 1 comm slot.
How should I wire up?
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