Right in the middle of this job and realised I don't know what I'm doing. I'm in the UK.
I currently have a Crabtree switch (which I believe is called a single gang two way switch) on a light on my living room. The switch had three wires on it which feed into terminals on the switch labelled: L1, L2 and L3
However on my new Crabtree dimmer switch the terminals are labelled as:
L1, L2 and a then a wavy line with a diagonal arrow through it pointing to the top right.
Can anyone please explain how I should wire the new dimmer in? Should L3 now go into the terminal with the wavy symbol?
Any help would be really appreciated as I don't want to blow anything up.