How do i wire a 3 gang switch - Cooper Industries Cooper Wiring 2158V 3 Gang 2 Toggle Switch- Duplex Wallplate, Ivory

Assuming both switches are single pole...
One black wire from connects breaker connects to each switch.
One black wire from light goes to light
http://waterheatertimer.org/How-to-wire-switches.html#gang

If your switches are 3-way... then re-post new question.

Gene

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

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

Is the neutral wire inside the gang box, or is the neutral wire in the ceiling box?

Gene

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

All 3 switches should be grounded, plus one box should have a ground wire to the box ground screw, all ground wires into the 3 gang should be connected together, run a 4th to the metal box and one to each switch ground.

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

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

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

Your switch has 2 wires, and 2 brass screws, and new switch will have same.
Connect either wire to new switch.
Connect bare ground wire to green screw.
Turn power off, remove screws that hold switch into box, pull out switch, take photo of wiring, install new switch.
If wires are pushed into back of switch, then use small screwdriver and push into slot to release wire.
http://waterheatertimer.org/How-to-wire-switches.html

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.

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

I draw a little diagram may help you...