I'm trying to swap some light switches round; 2-gang, 2-way to 2-gang, 2 way dimmer; One of them has L1, L2 and C (in which C appear to be the Live); while the other has L1 L2 L3 (in which L1 is live); so I'm uncertain about how to swap them over; also there's 7 wires going into one and 9 into the o...
