It is used when you have three or more switches controlling one light the middle switch needs to be an intermediate light. You would just continue from one 3 way switch box with the 143 three conductor cable two colored traveler wires a white neutral and a bare or green ground wire in and out of each four way switch box.
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Intermediate light switch wiring diagram. In some countries the four way is called an intermediate switch. It is effectively two single gang intermediate switches on one face plate. The source is at sw1 and 2 wire cable runs from there to the fixtures. See the light switch wiring diagrams above and below. Intermediate switch wiring diagram new cable colours the intermediate light switch is used where three or more switches control one light and used in conjunction with two two way light switches to achieve this. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light.
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. Intermediate switch an intermediate switch is a three way light switch. This diagram illustrates wiring for one switch to control 2 or more lights. 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.
Gallery of Intermediate Light Switch Wiring Diagram
