Help with wiring dimmer switch

The wavey line with arrow is your common.

 

And don't forget the EARTH.

 

Lol. And don't forget to put a fly lead in to back of box. I know what your gonna say, fixed lug blah blah good practice though.
P.s 2 brown in l1 and other in l2

 

Two browns in old C goto wave line terminal (phase?), and L2 brown old goes to L1 or L2, doesn't make a difference as you're not using two way switching, and most important, as already mentioned, DO NOT FORGET THE EARTH

 

The incoming earth looks to be connected to the back box - and I agree with you, ignore the fixed lug and make a connection to the terminal.

 

Wrong Mr Camels Toe

I'm assuming the two browns are the lighting radial seeing as there are two blues in a choccy block there as well-it won't make any difference to the operation, just good practice to have the radial lives in the common.

 

Disagree. Two browns in L1 (or L2) single brown in the middle terminal (wavey line)
E the F

 

Jayjays, I apologise for my sparky friends and their trickle of (sometimes mis) information...

This is what to do:

Put the two browns (currently in L1) into the centre 'squiggle' terminal on your new switch.
Place the single brown (currently L2) in to L1 on the new switch (although it'll also work in L2)

Then, since your new switch is metal-faced, it'll need to be 'earthed' (unlike your old plastic switch). To do this you'll need to take a short (around 4") of cable, sleeve it in green/yellow to indicate it's 'earth', and connect it between your earth terminal in the back box and the brass 'earth' on the switch plate.

It might (ie - I don't know) be the case that the fixing screws will be enough to make this earth connection, if your back box is also metal, and earthed. But an earth cable link is highly recommended.

 

No.

The 2 browns into the centre wavy terminal. That is the equivalent of the common. Single brown into either L1 or L2, I would normally use L1.

You then need a piece of earth wire to connect a new earth wire fromthe switch into the existing earth connection.

 

Sorry DA. You must have posted wile I was typing.

Kind regards

 

My bad, old L1 is what I called C, apart from that my method is correct, like DA'S

 

Agree.

 

Yes. Don't move earth wire. Add a bit from that terminal to new switch earth terminal.