Light Switch Wiring
Two Way Light Switch
Wiring
Have you ever wonder how a lamp that
is used to light up the stairs of a building is connected to the two switches
that controls it from either end? These two way switches have a single pole
double throw (SPDT) configuration.
Each has a common terminal (COM)
with a pole that can be switched between position L1 or L2. The two way light
switch wiring can be implemented by using 2 different methods. Both of the
methods used are described below.
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| Light Switch Wiring |
The first method as shown in the
figure above have the COM, L1 and L2 of both the SPDT switches connected
together. For incandescent lamp, the recommended wire gauge used is AWG #18.
The LIVE AC Source is connected to L1 of SW1 and one side of the load is
connected to L2 of SW2. The other side of the load is then connected to NEUTRAL
of the AC Source. With this configuration, the lamp will be turned ON when one
switch is at ON position and the other is at OFF position. If both switches are
in the same position, the lamp will be OFF.
The other method is as shown in the
figure above. In this configuration, the L1 of both SW1 and SW2 are connected
together. Similarly, the L2 of both SW1 and SW2 are connected together. The
LIVE of the AC Source is connected to COM of SW1 and one side of the load is
connected to COM of SW2.
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| Two Way Light Switch |
The other side of the load is then
connected to the NEUTRAL of the AC Source. With this configuration, the lamp
will be turned ON when one switch is ON and the other is also ON. If both
switches are in different position, the lamp will be OFF.
Take note that as the installation involves mains power supply, only those who are qualified and have electrical wiring knowledge should do this wiring. When doing the wiring, it is recommended that the power supply is disconnected from the load and the switches.
Take note that as the installation involves mains power supply, only those who are qualified and have electrical wiring knowledge should do this wiring. When doing the wiring, it is recommended that the power supply is disconnected from the load and the switches.
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