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installing an outside light

This topic originated from the How to page called Replacing a one way light switch with a two way light switch
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hopelesselectric

from United Kingdom

Joined: 17 Oct 2003
Posts: 3
Location: United Kingdom

PostPosted: Fri Oct 17, 2003 11:10 am Reply with quote

I have a single switch in my garage for one light, it has a red cable into L1 and a red one into L2. I want to install an outside light and put a double switch in its place. The double switch I have has L1, L2 and common on the top and bottom. What cables go where?? icon_sad.gif
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breezer

from United Kingdom

Joined: 03 Jan 2003
Posts: 23328
Location: Sussex,
United Kingdom
Thanked: 27 times

PostPosted: Fri Oct 17, 2003 10:06 pm Reply with quote

you can not do as you ask. but i need more information first.

the light you have, take it apart and tell me what cables you have.

Ultimately you will be running a new cable from this light

incidentally a switch plate with two switches is called 2 gang, just thought i would mention that
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hopelesselectric

from United Kingdom

Joined: 17 Oct 2003
Posts: 3
Location: United Kingdom

PostPosted: Wed Oct 22, 2003 9:22 am Reply with quote

breezer wrote:
you can not do as you ask. but i need more information first.

the light you have, take it apart and tell me what cables you have.

Ultimately you will be running a new cable from this light

incidentally a switch plate with two switches is called 2 gang, just thought i would mention that


There is a single red wire into L1; the other wire apart from the red wire into L2 there is a separate 'bare' wire within the sheath that has been cut back. The only other wires will be the 3 wire to go the outside light. I also have a 3 pin wall socket in the garage; could this be used instead?
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alexnic

from United Kingdom

Joined: 19 Dec 2002
Posts: 186
Location: United Kingdom
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PostPosted: Wed Oct 22, 2003 3:43 pm Reply with quote

Hello Hopelesselectric,

That sounds like the switch connections you have just quoted again rather than the light connections. icon_confused.gif

There should most likely be 2 x twin & earth sheathed cables at the light fitting with the 2-reds connected together in a seperate connector, 1-black and 1-red in seperate connectors which are across the element of the light (bulb) itself .... one of the 2-reds that are connected together is the live cable down to the switch, thro' the switch and back up as the switch wire (normally comes back up as a black wire and you put a bit of red tape on it to distinguish it from the other Nuetral wires, but you say both the wires are Red at the switch)

The bare wire cut back is the earth which should be connected to all other earths and sleeved in green/yellow sleeving especially for any outside fittments

If the above is what you have then another cable will have to be run from the existing light to the new outside light (red connected to your 2-reds at the original light and the black to the black nuetral wire at your original light and then a twin & earth cable down to the switch from your new light to provide your feed / switchwire across Common and L1 of the 2nd switch. Again the 2-reds together in a seperate connector and the 2-blacks you have left are the Nuetral and Switchwire which will be connected across the light element


There are umpteen ways of doing what you require but this is probably the easiest.

Breezer ...I've seen you post a few images of this wiring in previous posts, do you still have them?

If it is a PIR security halogen flood light you are fitting you would probably be better forgetting about the 2-gang switch and coming out of the 3-pin socket to a switched fused spur unit (3-amp fuse) and up to the new light

Probably as clear as mud... icon_smile.gif
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hopelesselectric

from United Kingdom

Joined: 17 Oct 2003
Posts: 3
Location: United Kingdom

PostPosted: Fri Oct 24, 2003 4:26 pm Reply with quote

I did actually follow what you said, that surprised me. However I decided to go for the simpler second option that you mentioned as it was a floodlight I was installing. The result of all this is that I now a working outside light. Thanks very much for your help. icon_lol.gif
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