Changing Broken Dimmer Switch

Sep 28, 2020
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United Kingdom
Hello lads wanted a bit of advice regarding replacing a broken dimmer switch for a new one.

I know the fuse must be turned off and to check if power is dead. What I'd like to know is regarding the wiring. There are 2 red wires going into the switch and 1 blue. I take it the reds are L1 and L2 and the blue is common? Theres also a green that goes into ground with common and not into the switch? Whats the green for?




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