Light switch Hello I have a 3 gang light switch which at the moment I using for two lights one on each switch which are part of a two way system. I want to add another single external light to work on the third switch how do I wire this up I have tried by the switch does not work and the light does not come on either help!!

Copy following links:
http://waterheatertimer.org/How-to-wire-switches.html#gang

http://waterheatertimer.org/images/3-gang-box-800.jpg

You have to test which wire is neutral.... usually white wires twisted together and covered with wire nut in back of box.
Hot wire with test 120volt to neutral.
Hot wire will test 120volt to ground.

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

I can probably help.
BUT, what voltage are you working with. It sounds like 230V european wire colors?
Now also. Do you have two separate light switches in same box (which is called 2-gang)? Or do you have a double switch, which is two switches on one device?
Add a comment, and include as much detail as possible about the switch, voltage, and number and color of screws on each switch.
Here is a start-point using 120Volt and US wire colors:
http://waterheatertimer.org/How-to-wire-switches.html#double
The difference between US and European, is that European has two hot wires, while US has hot and neutral wires. Otherwise both systems require two wires to complete circuit.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for wiring 3-gang switch:
http://waterheatertimer.org/How-to-wire-switches.html#gang

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

What is 1mm double core?
Following image shows example 120Volt 4 gang switches with outlet.
http://waterheatertimer.org/images/Single-pole-switches-in-4-g.jpg
Each 120Volt electrical box has one Hot wire. This is true for ceiling and wall boxes.
Normally in a gang box, the Hot wire jumpers across all devices in the box.
Some switch boxes do not have Neutral wire. Neutral wires are usually white, and are twisted together and covered with wire nut and shoved to back of box.
Open following links for typical 120V and 240V circuits in US.
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/See-inside-main-breaker-box.html

Feel free to add a comment and describe wiring, and voltage.
For example if hot wire arrives from one of the lights.
Describe the wires that you have, and what each wire goes to for best possible answer.

Open following links for images of 3-gang and 4-gang single-pole switches.
With the 4 gang, just subtract one of the switches.
http://waterheatertimer.org/images/Single-pole-switches-in-4-g.jpg
http://waterheatertimer.org/images/despard-500.jpg

If you have a 3-way switch, or outlet in the box, then add a comment with more exact information about what wires you are trying to connect, what color wires you have, and what you have tried so far. This will narrow down the possible answers and speed help.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on circuit or any do-it-yourself project.
Fixya is always less expensive than a service call.

Hello.
All whites are marretted together,

• white power - white 1st light - white 2nd light

Blacks are the return for each light, and are joined after passing through the switches,

• black FROM 1st light - top of switch - bottom of same switch - black power AND other black from 2nd light (see next step)
• (repeat of above) black From 2nd light - top of 2nd switch - bottom of 2nd switch - black power AND black from 1st light

NOTE: both switch blacks are marretted together to the black of power. Ground all 3 as normal to dblgang box. Total marrettes required is two (three if using one for grounds) Hope this helps. If so, please rate a four-thumbs up, Thank You.

http://www.lutron.com/Products/StandAloneControls/Dimmers-Switches/Pages/DimmersSwitches.aspx

Lutron shows widest selection of dimmers.
The wattages you posted are standard for multiple dimmers.

Once you identify type of dimmer, add a comment and say if dimmer is single-pole or 3-way.
A 3-way dimmer would be in a hallway, where more than 1 device controls same lights.
Single pole is where one device controls lights.

If I know what dimmer you have, I can search for the product and add another comment.

Or search for yourself:
For example, let's say you have 3-way Skylark dimmer.
Do a google search for 3-way skylark dimmer:
http://www.google.com/search?q=3-way+skylark+dimmer&ie=u
Or 3-way rotary dimmer, etc.

If information above doesn't help, then take advantage of fixya phone service.
Fixya expert can talk with you over the phone for a price.

before u start make sure power is off before working with electrical lines ---start with the 12/2 coming into box black [power] white [ground-neutral] and u will have 3 separate lines for the lights so u will have 4 lines total coming in the box== with the 3 light lines take the white and strip back the plastic and connect [wire nut] all 3 to the 12/2 white line --now take the 12/2 black line and connect it to the first switch gold color screw- bottom screw -now take some wire about 2-3 inch strip both ends and connect from the 12/2 black wire connection on the switch and connect to the gold /bottom of switch 2 than do the same for switch 3 connecting the wire from switch 2 so u will have power feeding all 3 switches-- now connect the black lines for the lights to the other side of each switch and ur done

if it is a plastic box, you have to take to box out of the wall and install a tri-gang box.
if it is a metal box, then you can take anothre one take off one side panel andone side panel from the gang and screw them together.

I draw a little diagram may help you...