Intermediate Lighting Circuit Wiring Diagram. The source is at sw1 and 2 wire cable runs from there to the fixtures. 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.
The four terminals of intermediate switch construction and its operation are shown in fig below where the 4 contact points may be known as a b c d. When the switch knob is up the terminal contacts of intermediate switch connect terminal a with terminal c and terminal b with terminal d as shown in fig 1a. Four pages showing how 3 plate lighting circuits can be wired up.
Here we have a 3 way switching lighting circuit sometimes called two way switching with intermediate.
Here we have a 3 way switching lighting circuit sometimes called two way switching with intermediate. Most likely to be found with wires in conduit. Usually the third wire passes the middle intermediate switch but is joined in a separate terminal block. As a part of the am2 exam you will have to wire up a 2 way and intermediate lighting circuit with one light.
