There are different ways to connect up two way lighting
circuits, if it is a new installation the ideal way is to use a
three core & earth cable between the two light switches
Method 2
Two way lighting circuit using three core & earth cable
Line diagram of a two way lighting circuit using junction boxes
(fig 1).
fig 1
The junction box should be wired as shown below.
fig 2
Explanation of above picture . (fig 2)
The feed cable comes from a previous junction box or from
the consumer unit, the red, black and earth wires are
connected to separate terminals. The earth wire must be
covered with green/yellow sleeving.
The cable going to the first light switch is connected as
follows (fig 2). The red wire going to the switch is connected
to the same terminal as the red wire from the feed cable, the
black wire from the switch is connected to the spare terminal
(terminal not yet used), and the earth wire is connected to the
same terminal as the earth wire from the feed cable.
The black wire from the switch, should be marked with red tape
or red sleeving to show it is a live wire, but in practice is often
left unmarked.
The cable going to the ceiling rose is connected as follows
). The red wire going to the ceiling rose is connected to
the same terminal as the black wire ( marked with red tape or
red sleeving ) coming from the light switch, the black wire
going to the ceiling rose is connected to the same terminal as
the black wire from the feed cable and the earth wire going to
the ceiling rose is connected to the sa
me terminal as the
earth wire from the feed cable.
The following picture is exactly the same as the picture above
with the addition of another cable which provides the feed for
the next junction box.
The cable going to the next junction box is connected as
follows (fig 3). The red wire going to the next junction box is
connected to the same terminal as the red wire from the feed
cable, the black wire going to the next junction box is
connected to the same terminal as the black wire from the
feed cable and the earth wire going to the next junction box is
connected to the same terminal as the earth wire from the
feed cable.
The first two way switch can be quite difficult to wire up.
The feed cable going to the first switch is connected as
follows ). The red wire is connected to the (L1) terminal,
the black wire is connected to the (L2) terminal and the earth
wire is connected to the earth terminal.
The black wire from the feed cable, should be marked with red
tape or red sleeving to show it is a live wire, but in practice is
often left unmarked.
The cable going out to the second light switch is connected
as follows (fig 4). The red wire is connected to the common
(C) terminal, the yellow wire is connected to the (L1) terminal
along with the red wire from the feed cable, the blue wire is
connected to the (L2) terminal along with the black wire
( marked with red tape or red sleeving ) from the feed cable and
the earth wire is connected to the earth terminal.
If you are using a plastic switch the earth wires will need to
be connected to the terminal in the terminal box (as shown
above) because there are no earth terminals on plastic
switches.
The second two way light switch is a bit easier to wire up.
The cable coming from the first light switch is connected as
follows The red wire is connected to the common (C)
terminal, the yellow wire is connected to the (L1) terminal, the
blue wire is connected to the (L2) terminal and the earth wire
is connected to the earth terminal.
A metal light switch must be earthed as seen below.
If you are using metal light switches (fig 6) make
sure you connect the earth wire to the earth terminal
on the switch.
When using a ceiling rose on a circuit that utilises the in line
switching method, again the wiring is quite easy, the difficult
part is working at height and above your head.
The cable going to the ceiling rose is connected as follows
). The red wire is connected to the same terminal block
that contains the brown wire going to the lampholder, the
black wire is connected to the same terminal block that
contains the blue wire going to the lampholder and the earth
wire is connected to the earth terminal.
When using a ceiling rose on a circuit that utilises junction
boxes, again the wiring is quite easy, the difficult part is
working at height and above your head
The cable going to the ceiling rose is connected as follows
). The red wire is connected to the same terminal block
that contains the brown wire going to the lampholder, the
black wire is connected to the same terminal block that
contains the blue wire going to the lampholder and the earth
wire is connected to the earth terminal.
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