Replacing a 3 Gang Switch for Upstairs Landing but Cannot Figure out Wiring


Postby ollieonline » Sat Jul 29, 2017 5:25 pm

I am hoping that one of you wonderful people will be able to help me.

I am trying to replace a three gang light switch in my hall way. The switch operates the upstairs landing light (which also has a switch up stairs), the porch light and the hall way light - both of these last two switches are only controlled from this switch - i.e. there are no others.

The existing switch has:

Top Row - L3 (empty) / L2 connected / L1 connected / L3 empty / L2 connected
Bottom Row - L1 connected to the cable in the wall and also to the other L1
on this row /L3 connected / L2 connected / L1 connected

The new switch has Top Row L1 / L2 / Com / L1 / L2
Bottom Com / L1 / L2 / COM

(I've attached some pictures to hopefully make things clearer - the switch with the black back connectors is the new one.)

I am at a complete loss of how to wire this up. I've tried a few things and i cannot seem to get all the lights working, so far the best I have had is two of them working and the worst - none of them working - where am I going wrong?
Attachments
new switch.JPG
existing switch disconnected.JPG
existing switch connected.JPG
ollieonline
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Sat Jul 29, 2017 5:10 pm

Sponsor

Simply Build It

Postby Mr White » Sat Jul 29, 2017 7:35 pm

You should connect it as it was before. Its just the same switch but different names.

L1 is now Com
L2 Is now L1
L3 is now L2
Mr White
Rank: Tradesman
Progress to next rank:
50%
Posts: 37
Joined: Tue Jun 20, 2017 9:54 pm

Postby ericmark » Sun Jul 30, 2017 12:54 am

I can see a sleeved blue and yellow wire going to different switches that does not seem correct. I would expect to see the cable with red, yellow, blue to go to one switch, That cable would be for the two way light.

As said already
Com = L1
L1 = L2
L2 = L3
ericmark
Rank: Project Manager
Posts: 1807
Joined: Fri Oct 02, 2009 8:49 pm
Location: Mold, North Wales.

Postby ollieonline » Sun Jul 30, 2017 5:23 pm

Thanks both for your help.

Wiring it up the way you both said works, i can't believe i missed that, its obvious when you said it! but I'm not a sparky.

ericmark - i didn't have to make any changes to the other wires.
ollieonline
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Sat Jul 29, 2017 5:10 pm

Postby kbrownie » Mon Jul 31, 2017 4:35 pm

One other thing that you should be made aware.
Metallic switch plates require to be earthed, you have a number of CPCs connected to the back box, you need confirm they are offering a fault path to earth, there visual existence is not enough. Once confirmed they then not to be terminated to the switch plate.
kbrownie
Rank: Project Manager
Posts: 1995
Joined: Mon Mar 05, 2007 9:36 pm

Display posts from previous
Sort by
Order by



  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!



 


  • Related Topics