landing and hall switch wiring

aaronpawlak

Hi,

1 light on the upstairs landing, which is a single switch, but this also works from a double switch down at the bottom of the stairs as well

-1 light at the bottom of the stairs which is a lobby light which works from the double switch at the bottom of the stairs as well.

On the back of the single switch at the top of the stairs I have 3 terminals

L1 L2 L3 and 4 wires, red, yellow, blue and earth. Im fine with where the earth goes?

Please help.

I didn't find the right solution from the Internet.

References:-

Thanks

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