Wiring exterior light

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Good afternoon folks!

Just thought I'd quickly install and wire up my girlfriends new exterior light. Ha. If only it was that easy.

It's a new build and a four core cable with black, grey, brown and bare wires had been left capped by the front door. That four core cable goes to a switch in the porch. It wasn't connected to anything and was just connected to a connector block. Going into the COMMON on the rear of the exterior light switch is a short brown live wire from the L2 of the adjacent porch light switch. So the unconnected four core cable has a brown wire, a black wire with brown sleeving, a grey wire with blue sleeving, and the bare wire has yellow/green sleeving and is already in a connector block with numerous other earths where they all terminate. So, two questions!

1) to connect the rear of the switch up, does brown into COMMON and black with brown sleeving into L1 make sense? There is already a connector block with other blue sleeved wires terminating in it, does this grey wire with blue sleeving need to terminate in there too?

2) when it comes to installing the exterior light, obviously brown goes into live and bare into earth. But which wire goes into the neutral on the fitting? Black? What happens to the grey wire?

Cheers for all your help. I'll get you a beer.
 
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Sounds like it may have been installed with a sensor light in mind, ie a permanent live, switch live, a neutral and an earth.
Grey is usually used as neutral and sleeved blue.
To use it a a simple on/off switch the brown can go to common, the grey to neutral (blue sleeve) and the black remain in a terminal block ie not connected to anything.
At the light end brown to L, bare wire sleeved gn/y to earth and grey sleeved blue to N.
Black sleeved brown into a terminal block as a spare core.
If you want to instead you may sleeve the black gn/y at both ends and double up with the earth.
 
Thanks very much for posting. I've now connected it up as you suggested, but the light isn't working. The brown wire running out of the COMMON and in to the light fitting is live. However the blue sleeved grey wire running out of L1 and into the rear of the light is also live? As there is already a brown wire, permanently live, going into COMMON from L2 of the adjacent switch, does the brown wire from the four core running to the exterior need to go elsewhere?
 
Remove the blue wire from L1 and connect to the neutral connection.

Regards,

DS
 
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Use the colours to identify the cores at each location - make no assumptions about what they are being used for, as the electricity can't tell.

Learn how lighting circuits are wired, what switches do, get a multimeter and learn how to use it, identify which conductors are which at the switches and the light positions, connect everything up properly.


//www.diynot.com/wiki/electrics:lighting
 

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