"Mike Hibbert" wrote in message
...
Hello all,
we moved recently and the previous owners took all the wall lights before
they went. I have replaced the dangling ceiling roses OK and fitted some
new
wall lights where the old ones used to be. But....... they don't work. I
have checked the following.....
There is power to the red wire on the wall (checked with multimeter), but
if
I put the blacjk lead to the black on the MM, there is nothing, I only get
a
result if i earth it. So the red is live.
The dead black wire at the switch is more likely to be the switched live to
the light fittings
The black in the wall is the same black in the switch.
Then this will become the live feed to light when it is connected through
the switch that has a live to it already.
The switch is a 3 way switch, the other 2 switches wok the main lights and
they are OK.
The main lights must already have a neutral connection, which is what you'll
need to find for the wall lights.
There are a number of wires and crossover wires, but there is a blue and a
black which have been disconnected in the switch. I have tried wiring
these
up to the space terminal (marked 2 way) in the switch - Nothing!
The switches sound as though they are two way, which have a common at one
side and an L1 and L2 at the other. If you are not using them as two way
switches, then forget about L2 on all of them.
The live from the wall goes into the termial marked 1 way, and another red
live goes into the common at the top.
The live feed goes to common on each switch, without exeption. It must link
all the switches together to make them all work. It is the live feed which
you are making and breaking when you flick each switch.
A circuit must be like a loop. The loop can contain a switch which opens
the loop and stops the flow of electricity around the loop. A bulb just
becomes part of the loop. The loop flows from LIVE to NEUTRAL through all
parts of the loop when the switch is closed (ON). When the switch is open
(OFF) no electricity can flow through the loop.
What you're trying to find on these circuits, is how to make them loop from
LIVE to NEUTRAL. So the first thing to do is to find the main LIVE and
NEUTRAL wires that feed all of these loops.
I have looked in my Wiring and lighting book, but it seems liek everythign
is Ok (clearly not though!)
Buy a new one.
dunno if anyone can help without seeing it, but any thoughts would be
welcome!
Thanks
Mike
Start at each light fitting and trace with the multi-meter to where each
cable goes to. Each light fitting can only have two wires going it that
make it work. Forget ALL the earth wires, they are connected to the metal
body of the light fittings, as a safety device. Once you've found these two
wires that make the lights work, then the light will work.
A Switch is only a device for breaking the loop (CIRCUIT), and literally
becomes part of the loop when it is closed (ON) so the wires going to a
switch literally become one wire that switch breaks (OFF) or joins (ON) to
allow electricity to flow around the rest of the loop (CIRCUIT). Once you
understand this concept, it becomes easier to deduce how all the different
loops are joined to the MAIN LIVE and NEUTRAL wires coming from the fuse
box, so that they all become little loops going through all the bulbs in the
light fitting.
Once you know where all the wires are going and coming from, then you should
be able to work out how to make them into loops that go through all the
switches and bulbs.
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