I’m attempting to install a sonoff zbmini for a 1-way light switch to my bathroom. Here are some pictures of the switch.
My question is, should both wires which are currently going to L1 on the switch, go to L out on the zbmini? Then live common to L in?
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This not what the community guides category is for. Please read the category descriptions. Moved.
There is no way to know for sure unless you have a meter or probe that can tell you which side of the switch is always live and which side is the switched live.
You also seem to have a metal switch plate that is missing an earth connection - not good.
general advice - don’t mess with electrics unless you are certain you know what you are doing. If you aren’t find someone qualified.
Good luck
