By connecting one or more 4 way intermediate switches in line with 3 way switches at either end the load can be controlled from three or more locations. First of all we need to go over a little terminology so you know exactly what is being discussed.
Two Way And Two Way And Intermediate Switches For A Domestic Lighting Circuit Connections Explained
Two way and intermediate switch wiring. Follow this link if you are looking for a comprehensive step by step guide on two way and intermediate lighting circuit wiring. How to connect 2 way switch wiring using three wire control. In a previous video i showed how a two way. This video also shows how an intermediate switch works. An intermediate switch is used if more than two switches are required to control a two way lighting circuit. In an intermediate switch there are four terminals by which it changes the flowing of electric current from one circuit to another see fig 1 2 and also known as three way switchit has the ability to on and off the electric supply by two ways.
This allows a single light to be turned on or off from any of the switches. Wiring a 2 way switch is about as simple as it gets when it comes to basic house wiring. This page shows it wired in the old cable colours if your house has the new colours you want to go here. It should be fitted between the first and the last switches on the circuit. The four terminals of intermediate switch construction and its operation are shown in fig below. As a part of the am2 exam you will have to wire up a 2 way and intermediate lighting circuit with one light.
An application of above using multiple switching positions to switch multiple lamps. An intermediate switch can however be implemented by adding appropriate external wiring to an ordinary six terminal dpdt switch or by using a separate dpdt relay. If replacing an existing switch note the location of the terminals and the colour and position of cable connections. Construction working of intermediate switch. In fact any number of intermediate switches can be added to add as many extra switching positions as required. Where 0 represents the off condition and 1 represents the on condition.
Here we have a 3 way switching lighting circuit sometimes called two way switching with intermediate. The addition of an intermediate cross over switch allows a two way switched lamp to be controlled from a third position. Go to my switch terminology page where i discuss the terms used for the different types of home electrical switches. There is more than one way to do this depending of the type of cable available and on the installation requirements. This is the new method to make a 2 way switching connection as it is slightly different from the two wire control method. To wire a three way lighting circuit you will need 2 two way switches and an intermediate switch.
This method is commonly used now days as it is efficient than the two wire control system. Otherwise continue with the am2 exam guide.
Gallery of Two Way And Intermediate Switch Wiring
