Question about Computers & Internet
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.
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. 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.
Posted on Nov 13, 2010
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 24, 2016 | Cars & Trucks
Jun 26, 2016 | Holden Cars & Trucks
Nov 22, 2015 | Honeywell Digital Round Thermostat,...
Oct 08, 2014 | Cars & Trucks
Mar 14, 2011 | Electrical Supplies
Jan 17, 2011 | Buick Riviera Cars & Trucks
Apr 11, 2010 | 1990 Chevrolet Beretta
Nov 22, 2009 | Isuzu Rodeo Cars & Trucks
Jul 17, 2009 | LG Studioworks 700S 17" CRT Monitor
Nov 17, 2008 | LG Studioworks 700S 17" CRT Monitor
51 people viewed this question
Usually answered in minutes!