1 way switch to dimmer - HELP!

[johnkaye]

i have 2 switches i would like to change to dimmers. the 1st one is wired as 2 blacks in the L2/com (top and bottom), then a red wire in the 1 way. the dimmer only has c and L2, what goes where?

the second switch is currently wired as black in L2, red in 1 way, then theres another red wire at the bottom of the L2!!!!!!!!!!!

the back plates are earthed, will this earth the metal outer plate too?

all help much appreciated!

 

[Spark123]

The first one sounds like a 2 way lighting circuit i.e. you have a light switch at either end of the room? For this you'd need a 2 way dimmer switch.
Can you please recheck what is where on the 2nd switch and tell us what goes where? Is this a single way lighting arrangement?
Please note that you cannot have 2 normal dimmer switches controlling the same light.
My opinion is it is better to connect the earth wire directly to the switch and a short tail off to the back box, mainly because most back box earth terminals are poor.