"Lurch" wrote | "Owain" wrote: | >| Actually, what I meant was if it were a two way switch with a | >| twin coming from the light fitting it wouldn't matter which | >| way round the live and switch wire went into the two terminals | >| that they were required to go into, (L1 and L2, or similar). | >Buuuut ... | >If you've got a live and a switch live at the switch, and you | >put one into L1 and one into L2, the light will never come one | >because a two-way switch never shorts L1-L2. Does it? | Quite right, it doesn't. But that's not how a two way switch works. | Draw a diagram, trace the route through the switches, then come back. | ;-)
But you said "two way switch with a twin coming from the light fitting" and "a live and switch wire" (switch wire singular) so you weren't describing
2-way switching and it does matter that one of the wire has to go into the COM if you're using a 2-way switch as a 1-way.
Owain