Change 1gang switch to 2gang

Thedonkey68 · Apr 12, 2020

Hi there and apologies in advance if this has been asked elsewhere.
Long story short, I have a 1g switch at my front door for a hallway light - this is a 2way as other switch is at end of hallway.
I would like to convert front door switch to a 2gang for an outside light also.
I’ve attached a couple of photos but somewhat confused with wiring if anyone can help? Black is COMMON, Yellow is L2 & Blue is L1 if that helps.
Question is can I use existing cables at switch to control another light or do I need to add extra cables? Any help/pointers would be great.

westward10 · Apr 12, 2020

There is no neutral at that switch. That is a very odd way to wire a two way switch.

freddo · Apr 12, 2020

westward10 said:
That is a very odd way to wire a two way switch.

That method is great when wiring 2way switches that have tiny terminals such as dimmers. Though any crimp terminals used (not recommended) need to be properly fitted using a crimp tool, not a pair of side cutters as above.

newfutile · Apr 12, 2020

I had to think about that wiring for a bit, as westward10 says no neutral is present, your better off bringing a twin and earth from nearest light fitting into switch position, then another T&E from light switch to outside light , wago the neutrals and cpc (separately) in back of switch box, use switch to switch the live (line).