I want to replace a 1 gang 2 way switch with a dimmer switch.
The old wiring is 2 cables each with 1 red and 1 black wire plus earths.
The red and black wires from one cable go into two holes marked L1.
The other red and black wires from the second cable go into two holes
The new dimmer switch, which is a 2 way dimmer, has a C, L1 and L2
I understand that one of the wires is the live which goes into the C.
That leaves me with three other wires and 2 holes!
> and Software Development' (http://www.internode.co.uk ) |
Thanks for the link. Looks like my wiring is the old 'alternative'
method of 2 way switching with 2 core plus earth not three core plus
earth cables, probably with a borrowed neutral. Am still confused about
how I can wire it to the new dimmer. Think I might have to give up or
get a sparky unless you've got any other ideas.
Ok awake now...
still not making much more sense alas - a photo would help.
A normal single gang two way switch should have three terminals, C, L1
and L2 - i.e. exactly the same as your new dimmer.
A two way switch is a changeover switch - the C terminal is connected to
either the L1 or the L2 terminal depending on the position.
Hence your comment about what sounds like multiple L1s and L2s does not
seem right if we are talking about the same things....
Could you possibly have an intermediate switch?
This has 4 terminals rather than three?
How many switches have you in total that control the light?
How are the others wired?
> On 24/02/2013 14:24, John Rumm wrote:
Had a look but all the dimmers I could see in the shops had three
Think my switches are definitely intermediate switches. Don't know if
its possible to replace one of these with a dimmer.
You have two options...
1) Ignore the intermediate switch and leave it alone, and replace one of
the other switches (i.e. one of the proper three terminal two way
switches), with a two way switch dimmer. That give you brightness
control from the one switch position, and on/off control from that and
2) Replace all the switches with one master dimmer, and a number of
slave dimmers. You may need to wiring changes at the intermediate
position. This will allow on/off and brightness control from all switch
There are 3 switches so I'm guessing its an intermediate switch.
There's 2 switches on top of the landing and one down stairs. The top 2
are both wired the same way, haven't checked the downstairs one but I
want the dimmer upstairs. Need to keep a light on for the kids at night
but its too bright and drives me bonkers!
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