If replacing an existing switch note the location of the terminals and the colour and position of cable connections. 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.

Three Way Light Switching Intermediate Switch Switch
Intermediate light switch wiring. The source is at the switch and 2 wire cable runs from there to the light. Notice that the wire connected to the com terminals is looped straight through the intermediate switch using a cable connector. Staircase wiring using intermediate switch below is a given schematic circuit to control a light point from three different places by using two 2 way switches and intermediate switch in the middle of stairs. Staircase wiring connection using 2 two way switches and intermediate switch controlling of lamp from 6 six places by intermediate switch. This video also shows how an intermediate switch works. In some countries the four way is called an intermediate switch.
The source hot wire is connected to a switch terminal and the other terminal is connected to the black cable wire. The circuit consists of a two way switch at each end top and bottom switches in fig 2 and an intermediate switch in the middle. 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. Double gang switch face plate. Wiring a single pole light switch here a single pole switch controls the power to a light fixture. 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.
Double gang switch face plate. It is effectively two single gang intermediate switches on one face plate. To wire a three way lighting circuit you will need 2 two way switches and an intermediate switch. An intermediate switch is used if more than two switches are required to control a two way lighting circuit. All three switches are connected together by a three core and earth control cable. It should be fitted between the first and the last switches on the circuit.
In a previous video i showed how a two way. The white wires get spliced through. The diagram shows the common method of wiring an intermediate switch into a two way light switch circuit. It is effectively two single gang intermediate switches on one face plate.