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Okay, so from what you're saying it sounds like my switched live wire is also red because it can be live depending on whether the switch is on or off. That makes sense. This is the problem - I can't tell which is which. If it doesn't matter which way around I connect them to common and L1 on...

I have a dimmer switch that recently stopped working, so I'm hoping to replace it with a new one. This is the only switch that controls the light in question, so based on my googling I expected to see one red or brown live wire and one black or blue switched live wire going into the switch...