2-way switching existing light

[Seb101]

I'm fairly certain the answer to this is no... because you wouldn't be able to wire the common, but I thought I'd see if anyone had any bright ideas.

I've got an existing light which has a single switch cabled as a 2 core live/switched live. Is there a circuit possible which will add another switch to make this into a 2-way setup without changing the cable to the existing light switch (which is buried in a wall)?

Cheers.

 

[ericmark]

Yes the cable light to switch stays as it is. New cable goes old switch to new switch.

Also there are wireless options. I use energenie because I already have the hub. But there are versions which don't need a hub.

 

[Seb101]

Yes the cable light to switch stays as it is. New cable goes old switch to new switch.

Also there are wireless options. I use energenie because I already have the hub. But there are versions which don't need a hub.

Thanks - I guess I should have clarified I meant without having to change or run a new cable to the old switch. I was wondering if there was a way of doing it at the ceiling rose.

Yeah I looked as LightwaveRF stuff, that can do hub-less master/slave but it all seems to be priced a little over the top. You're looking at around 80 quid to do a single 2-way setup.

 

[ericmark]

In mothers house when rewired the electrician used three core and earth Leaving a spare core ready.

 

[Seb101]

Actually.... I think it is possible... because the existing switch is multi-gang and has other lives in it. If I pinch one of those Lives from another light to be the Live in the first switch, then use the existing 2-core as Common/Switched up to the rose, then use 3-core from there to the new switch... I think it'd work right?

Like this:

I guess the danger here would be potentially mixing Lives from different circuits - but if I verify that all the lights in the old switch are on the same circuit, is there any problem with doing it this way?

 

[bernardgreen]

This way may be easier to wire.


The now unused Live in the ceiling rose would need to be terminated in a terminal block

 

[Seb101]

Awesome Cheers.