adding third light switch

[doggone1]

Hi I have a two way switch wired as diagram can I add a third switch it is connected to a jb in the loft which i can access but cant easily run new wire to existing switches

 

[JohnW2]

Hi I have a two way switch wired as diagram can I add a third switch it is connected to a jb in the loft which i can access but cant easily run new wire to existing switches

You need something called an 'intermediate' switch. However, you can only do it if you have access (e.g. in the JB) to the wires coming from the L1 and L2 terminals of one of the switches.

Kind Regards, John

 

[EFLImpudence]

Yes.

You will need an intermediate switch and to run a 4-core + earth from the rose to the new switch location and two more connectors then -

break into one of the pairs of red and blue which run to either of the present switches.

 

[ericmark]

That is the basic diagram. The intermediate switch is placed in the blue and red wires you show going to L1 and L2 in either switch and it basic idea is it swaps the feed to L1 and L2 so would need 4 wires plus earth.

So you can take from either switch or rose.

In real terms if taken from switch what you would really do is replace existing switch with the intermediate and the new switch will be the two way that way only three core and earth required from old switch to new switch.

 

[doggone1]

Thanks for all the replys I have access to all the sitch wires in the junction box so i will have a go at the weekend

 

[ericmark]

I have just renewed a switch in the office and it came with an instruction sheet.

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• ericmark
• 31 Oct 2014
• 1

I hope it helps you?