Just went to change a one way dimmer to a one way switch and the black wire was in common and red was in L2
I thought red went in common and black in L1 ??
Probably leave it to an expert now as that has confused me
It doesn't really matter, a switch can go either way round if it is just a one way switch.
The black one should be sleeved to show that it's a line conductor on a switch line. They are rarely sleeved in the real world.
@apc started
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Just went to change a one way dimmer to a one way switch and the black wire was in common and red was in L2
I thought red went in common and black in L1 ??
Probably leave it to an expert now as that has confused me