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Wiring a 2 Gang 2-way light switch for 2 lights

This topic originated from the How to page called Replacing a one way light switch
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rs200tez

from United Kingdom

Joined: 19 Aug 2005
Posts: 5
Location: Avon,
United Kingdom

PostPosted: Fri Aug 19, 2005 10:16 am Reply with quote

I am having trouble replacing a light switch.
If anyone can help it would really be appreciated.

I have a light in the hall downstairs and a light in the hallway upstairs. One 2-gang switch has 2 buttons on it. Button 1 should turn on the upstairs light and button 2 should turn on the downstairs light.

There are 5 cables: 1x Black (connected to downstairs circuit 240v) 1x Red (connected to upstairs circuit 240v) 1x Red (no voltage) 1x Yellow (no voltage) and 1x BLue (no voltage).

The switch has a COM, L1 and L2 on both gangs...

How on earth do I connect this?

Thanks again
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slippyr4

from United Kingdom

Joined: 12 Jul 2005
Posts: 775
Location: Bedfordshire,
United Kingdom
Thanked: 4 times

PostPosted: Fri Aug 19, 2005 10:29 am Reply with quote

are they just single wires? or are they sheathed together?

1x Black (connected to downstairs circuit 240v) 1x Red (connected to upstairs circuit 240v)

and are you sure about that?
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rs200tez

from United Kingdom

Joined: 19 Aug 2005
Posts: 5
Location: Avon,
United Kingdom

PostPosted: Fri Aug 19, 2005 10:59 am Reply with quote

Not sheathed together -

I used my VDM on the cables and found that the Black and Red had 240v and the other red was not hot.

when i remove the upstairs circuit fuse the Black is no longer hot and when i remove the downstairs circuit fuse the red is no longer hot -

thank you for any help you can give me
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slippyr4

from United Kingdom

Joined: 12 Jul 2005
Posts: 775
Location: Bedfordshire,
United Kingdom
Thanked: 4 times

PostPosted: Fri Aug 19, 2005 11:02 am Reply with quote

the second switch in the two way (probably the landing), what colours are there? and check continuity between each of those and the wires downstairs.
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Qedelec

from United Kingdom

Joined: 22 Jun 2005
Posts: 1160
Location: Birmingham,
United Kingdom

PostPosted: Fri Aug 19, 2005 11:32 am Reply with quote

Did you not note where the wires came from before disconnecting them? If not then step inside the Tardis, dial yesterday and press 'Start'

You have two separate switches fed from different circuits. The 3 core cable will go to one switch and the 2core cable will go to the other.
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rs200tez

from United Kingdom

Joined: 19 Aug 2005
Posts: 5
Location: Avon,
United Kingdom

PostPosted: Fri Aug 19, 2005 11:53 am Reply with quote

Thanks for your help.... the tardis didnt work...

So one hot black and one hot red to common 1 and 2, Blue and Yellow to L1 on each swich - where does the non-hot red go?

pen and paper also not used - not used to modern technology icon_rolleyes.gif
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Qedelec

from United Kingdom

Joined: 22 Jun 2005
Posts: 1160
Location: Birmingham,
United Kingdom

PostPosted: Fri Aug 19, 2005 12:06 pm Reply with quote

Ok this is how I understand you.
The red you describe as 'hot' is from the 3 core cable, if so then connect the red to 'com' and the yellow and blue to L1 & L2 of one switch.
The other cable you say has 240 on the black wire which is puzzling but may have been wired back to front. If I assme correctly and this is the switch wire from the downstairs light then connect either wire to 'com' and either L1 or L2
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rs200tez

from United Kingdom

Joined: 19 Aug 2005
Posts: 5
Location: Avon,
United Kingdom

PostPosted: Fri Aug 19, 2005 12:12 pm Reply with quote

Like This???

Gang-1 Gang-2

Com Red Wire (240V) Com Black Wire (240v)
L1 Blue Wire L1 Red Wire (0v)
L2 Yellow Wire L2

Getting there!!
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Qedelec

from United Kingdom

Joined: 22 Jun 2005
Posts: 1160
Location: Birmingham,
United Kingdom

PostPosted: Fri Aug 19, 2005 12:18 pm Reply with quote

Yes and don't forget to put red sleeve or tape on all the condutors, except the earths, that go to the switch
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rs200tez

from United Kingdom

Joined: 19 Aug 2005
Posts: 5
Location: Avon,
United Kingdom

PostPosted: Fri Aug 19, 2005 1:38 pm Reply with quote

Thankyou for your help - really kind of you.

Will try tonight and let you know.

Cheers
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