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I have a double light switch that should operate 2 seperate lights in the lounge and dinning room. There used to be a single light switch that was operating the light in the lunge, but it was removed as i wanted to keep the double switch only. The wires Ive got coming out for the double switch is: Cable 1: red, black, earth Cable 2: red, blue, yellow, earth

The lit switch has 2 leads, each with L, L1 and L2.

Is there any way of connecting the witres to the switch so i can operate both lights again without needing to have the other single light switch connected?

Please advise.

Thanks

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    Can you post photos of the switch and the wires? Also, where on this planet are you? – ThreePhaseEel Sep 22 '16 at 11:40
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    It sounds like you've removed one end of a three-way circuit. You can make it work without any work at the double-gang box, but you'll need to tie two of the wires together at the box where the switch was removed. Update your question with clear photos or a simple diagram. – isherwood Sep 22 '16 at 13:26
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More information would be helpful, but here's what I think you have going.

It sounds like you're outside the U.S., probably in the UK or India where red, yellow and blue are used for hot wires and black for neutral?

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What we call a 3-Way switch here in the U.S. (because it has 3 terminals on it) is called a 2-Way switch in the U.K. and areas using the same terminology, because it controls the lighting from 2 different locations.

So the 2-Way switch is the switch with 3 terminals on it, labeled L or C (common), L1 and L2, plus possibly a 4th terminal for the "earth" wire.

In the "double switch box" (it's a double-gang box with two switches), you have 1 single pole switch, and 1 "2-way" switch.

The single pole switch controls a light by itself, simple. That's connected to the cable with 3 wires (red, black, earth), which is a "switch leg." The red and black are both hot wires in this case, one bringing power to the switch, and the other taking power back to the light.

The 2-Way switch (called 3-Way switch in the U.S.) is the one connected to the cable with 4 wires (red, blue, yellow and earth). The "common" is the incoming hot wire, and both L1 and L2 are hot, depending on the position of the switch, feeding power through to another 2-Way switch (then out the common wire on that other switch).

Your "single switch" on the other end should have also been a 2-Way switch. So there should be a cable with red, blue, yellow and earth wires in that box.

The 2-Way switches work as a pair, bringing power in the common wire on one switch, and out the common wire on the other switch. The other two wires are "travelers" and carry electricity between the switches.

So... you could try this:

  1. Leave the wires alone on the 2-Way switch that's still connected. Note which colors are connected to the common and L1 terminals.

  2. In the "single switch box" on the other end, connect the common and L1 wires with a wirenut. Cap off the other wire with a wirenut.

  3. Try the switch, it should switch your light on and off.

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