How to change 2 gang 1 way dimmer to normal switch

SG

Joined
25 Sep 2010
Messages
6
Reaction score
0
Location
West Midlands
Country
United Kingdom
Hi all, firstly I'd like to say what a great website, have been browsing for a while but only just signed up today!

Got a bit of a problem that I'm hoping someone might be able to point me into the right direction?

Basically in our living room we have a ceiling rose with 3x lights on it, plus 2 sets of wall lights with 2x lights on each 'rose' on the wall - these have on/off pull switches as well.

For some reason whoever lived here/owned this house before fitted dimmer switches for these lights, however they don't actually dim any lights they just turn them on and off.

Today I went to Wickes and bought replacement 2 gang switches which I want to fit in place of these dimmer switches.

The problem is the wiring here is quite old and kinda dodgy - it's a rented house and apart from making the landlord get someone to fit a consumer unit (we had some ancient grey box with an on/off switch) he isn't interested in fixing anything in the house so until we gather enough cash for a deposit on a house to buy, I want to make the house reasonably safe for us in the meantime without spending lots of cash.

I unscrewed the dimmer switches off the wall and had a look at the wiring behind them. There are 5 copper wires, ALL red in colour (!) with 4 coming from behind the wall. It's wired up like so:

5023927582_c6e3be0ba1_z.jpg


How do I wire this up to the new switches I bought today?

Annoyingly, there are NO markings whatsoever on the back of the dimmer switches so I'm not sure which wires go to COM/L1 etc. etc.

Any ideas?

Thanks,
Sam
 
Sponsored Links
your drawings are unclear they would not work like that.
Was there short links in the two switches, and how do you know that red link is between the two switches.
 
This is exactly how it is wired - I drew the diagram on paper with the switches off the wall and double-checked them.

There are two pairs of red wires coming from the wall, and one red link wire running down the side as per my diagram.

The lights do work as I'm typing this in the room they are in...
 
For some reason whoever lived here/owned this house before fitted dimmer switches for these lights, however they don't actually dim any lights they just turn them on and off.

I assume that is two doubles (4 dimmers) in your drawing
how many actually work the lights.
 
Sponsored Links
Sorry I forgot to say in my original post - it's just a 2 gang switch (i.e. 2 dials to turn ceiling/wall lights on and off).

The diagram is of the back of the switches by the way.
 
The four squares are the terminals yes?

Then the two terminals with 2 wires in them are the common terminals and the terminals with 1 wire each are the 1 way terminals.
 
If they represent 4 terminals on the back of a 2 gang dimmer

use common and common for the two red wires and
L1 and L1 for the single reds

if the switches are upside down after Then move the single red ones from L1,L1 and use L2 and L2
If your new switch is metal it Must be Earthed also.
 
Thanks guys. Right, so just to confirm you are both saying:

COM = terminals with two wires in them
L1/L1 = terminals with single wires in them

When I connect the 4 wires up to the respective terminals in the new switch I bought yesterday, do I need to do anything with that extra 5th linking wire - i.e. do I connect it between the two COM terminals as per the current wiring (if so, how come?).
 
You need all wires to make this work, as said before the two terminals with TWO cables in each will be the COMMON, ie the power in and out of the switches. The other SINGLE cables in each switch are the Switched Lives and they go to the lights.

YOU MUST USE ALL 5 CABLES OR ELSE IT WILL STOP OTHER LIGHTSB WORKING IN YOUR FLAT.

Nick
 
Thanks Nick.

I'm sure I probably come across as being a bit thick here, but I just wanted to know - why is the link wire needed?
 
Best guess is that you have one permanent live coming in, and the link wire is creating one which goes off somewhere else.

Try wiring it up without the link and see what else stops working apart from the other light on that switch.
 

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
Sponsored Links
Back
Top