if it's done using 3 core for strappers then it's browns into a connector block, then black and grey from one cable into the 2 terminals on the top of the switch, and black and grey from the other cable into the bottom of the switch..
if it's done with just 2 strappers then it's 2 browns ( or brown and blue with brown sleeving ) from one wire into the top terminals and 2 browns from the other cable into the bottom terminals....
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