The white wires get spliced through. It is effectively two single gang intermediate switches on one face plate.
Multiway Switching Wikipedia
Intermediate light switch wiring. This video also shows how an intermediate switch works. 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. Staircase wiring connection using 2 two way switches and intermediate switch controlling of lamp from 6 six places by intermediate switch. In some countries the four way is called an intermediate switch. 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.
In a previous video i showed how a two way. It should be fitted between the first and the last switches on the circuit. 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. 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. 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. It is effectively two single gang intermediate switches on one face plate. All three switches are connected together by a three core and earth control cable. The diagram shows the common method of wiring an intermediate switch into a two way light switch circuit. An intermediate switch is used if more than two switches are required to control a two way lighting circuit. The source hot wire is connected to a switch terminal and the other terminal is connected to the black cable wire.
To wire a three way lighting circuit you will need 2 two way switches and an intermediate switch. Wiring a single pole light switch here a single pole switch controls the power to a light fixture. Double gang switch face plate. 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.
Gallery of Intermediate Light Switch Wiring
