Hey rewstar
according to the package, those timers require a neutral wire
When I was out there wire jerking the majority of homes only have a Twin active switch wire to the light switches which means you will need to get your mate to drop a double insulated neutral from the light to the light switch and will need to choose specific lights
Not too hard but if they are planning just to change over the light switch then they might get a surprise
They won't work on 2 way or 3 way light circuits either
f
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