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Intermediate Switch Wiring

This permits a single light to be turned on or off from any of the switches. This page shows it wired within the old cable colours if your house has the new colours you wish to go here:

3 way switching (new cable colours)

This is very just like the 2 way switching circuit but with and additional intermediate switch introduced into the three wire control cable that links the two end switches.

fig 1: Three way switching schematic wiring diagram

The circuit consists of a two way switch at each end (top and bottom switches in Fig 2) and an intermediate switch within the middle. All three switches are connected together by a 3 core and earth control cable. Notice that the wire connected to the COM terminals is looped straight through the intermediate switch using a cable connector.

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