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Thanks for replying so quickly. So I can place either wire in the "Com" terminal of the new switch and I'm not going to blow something up? Out of curiosity, why might have the previous owners choosen this arrangement? Kind regardsPaul

Hello I've been replacing the old light switches with dimmer switches. Previously, the old light switches were clearly labelled, however the switch in the bedroom appears to have 2 red wires going to two different terminals, both labelled "1" (photo attached). I was expecting an "L1" and...