This page shows it wired in the old cable colours if your house has the new colours you want to go here. Here we have a 3 way switching lighting circuit sometimes called two way switching with intermediate.

Three Way And Four Way Switches How They Work 6 Steps
Intermediate lighting circuit wiring diagram. As a part of the am2 exam you will have to wire up a 2 way and intermediate lighting circuit with one light. Follow this link if you are looking for a comprehensive step by step guide on two way and intermediate lighting circuit wiring. L and n indicate the supply. This page shows it wired in the old cable colours if your house has the new colours you want to go here. Construction working of intermediate switch. 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.
These diagrams show various methods of one two and multiple way switching. Here we have a 3 way switching lighting circuit sometimes called two way switching with intermediate. This allows a single light to be turned on or off from any of the switches. This allows a single light to be turned on or off from any of the switches. The four terminals of intermediate switch construction and its operation are shown in fig below. The 3 way lighting circuit which is often referred to as the two way and intermediate lighting circuit is a common arrangement usually found in large houses.
2 way lighting circuit wiring diagram 2 way lighting layout drawing intermediate lighting. The most basic circuit with only two wires at the switch. If you are familiar with wiring a two way lighting circuit then the addition of an extra switching point will not be much of a problem. Switches are shown as dotted rectangles. Four pages showing how 3 plate lighting circuits can be wired up. There is more than one way to do this depending of the type of cable available and on the installation requirements.
Otherwise continue with the am2 exam guide. Earth wires are not shown. Two way switching 2 wires.