Tried to fit and wire up a new outside light fitting today, but it's not
working. I'm in a brand new house (moved in May) so the wiring is to the
new standards. The house had a cable pre-wired and available for the light
(and a switch inside), but covered with a plate on the outside bricks, so
removed that, and was then stuck with connecting the new light (red, blue
and earth connections); to the supplied mains. That was in a four-core
cable, with brown; black; grey and earth wires.
It seems like the cabling is not correct inside the house; and I do remember
the electrician from the builders saying it was disconnected at the switch,
but that doesn't appear to be true. With a meter it shows there is no
power at the cable, and I'll get the builders back to check, but I'm unclear
how the wires should be connected at the light in any case. Is there a
"normal" situation for this now?
Firstly this is a double switch. The right hand switch operates the
internal hall light (which works normally), and there is a duplicate single
switch that operates the same light further along the hall.
The left hand switch operates the outside light which isn't working.
The switch has L1, L3 and L2 terminals along the top, and L3, L2 and L1
along the bottom.
There are five cables coming into the switch back.
Omitting earths, these are wired as follows :
Cable 1 - Brown to Lower L2; Blue to common block holding blues.
Cable 2 - Brown to Upper L1; Black (in brown sleeve) to lower L2; Grey (in
brown sleeve) to Lower L3
Cable 3 - Brown to lower L2; Blue to common block holding blues.
Cable 4 - Brown to Lower L1; Black (in red or is it brown sleeve) to Upper
L2; Grey (in blue sleeve) to common block holding blues.
Cable 5 - Brown to Lower L3; Blue to common block holding blues.
nb. Cables 3 & 4 have the same config as the light outside that is not
working, i.e. black, brown, grey (and earth).
Or looking at it from a terminal perspective:
Upper L1 - Brown to cable 2
Upper L3 - no connections
Upper L2 - Black in red (or is it brown?) sleeve to Cable 4
Lower L3 - brown to cable 5; grey (in brown sleeve) to lower L2
Lower L2 -Black in brown sleeve to Cable 2; Brown to cable 1; brown to
Lower L1 - Brown to Cable 4
Can anyone see obviously what is wrong?
It looks like the the brown, black and grey cable (cable 4) is the cable
that runs from the switch to the outside light.
The electrician has supplied a cable suitable for a PIR sensor light. As
your outside light is not a sensor light (ie no PIR detector and you just
want to switch it on when you want to) then at the light fitting use the
grey wire as neutral and the black wire for live and then teminate the brown
wire behind both the switch and the light with a piece of strip connector
and do not connect it to anything else. Then place a link wire between the
lower L2 and the lower L1 on the switch.
If the switch cannot accept 4 wires in one terminal then move one of the
brown wires from cable 1 or 3 to the lower L1 before inserting the link wire
so that there are only 3 wires in each of the lower L2 and L1.
Hope this make sense
Great, thanks Adam, will try tomorrow. :-)
ps. In fact the light I purchased *does* have a PIR detector in-built,
although the wiring diagram and terminal block within it still only seems to
need a Neutral (Blue); Earth; and Live (brown) feed.
I've now successfully fitted the same light on the rear of my property,
where there was somewhat simpler pre-wiring, and on that where a brown feed
had intentionally been left unconnected by the builders. I'd expected just
the same on this front light, but there was no wire spare as I explained.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.