Hi, I\\\'ve read through previous postings but am still not sure how not to blow house up. Am replacing standard single light switch with a dimmer. Didn\\\'t note which wire went where on old switch because I assumed new one would have ok instructions - it doesn\\\'t have ANY other than connect mains supply to L1 and Lamp transformer (LV) to ~. Existing socket has one thin brown wire which is connected to metal socket box (earth I assume) it then has one red and one black (must be live and neutral). So could someone just confirm if the red or the black wire connects to L1/mains supply (and the other to the ~) - this is probably a stupid query, but I\\\'m just not sure enough!! Thank you