How To Wire a 3-Way Light Switch | Family Handyman Wiring a 3-Way Light Switch. Wiring a 3-way light switch is certainly more complicated than that of the more common single-pole switch, but you can figure it out if you follow our 3-way switch wiring diagram. With a pair of 3-way switches, either can make or break the connection that completes the circuit to the light. How to replace a light switch | Ideas & Advice | DIY at B&Q You can control a light from more than two separate switch positions. The connections for wiring the first and final switches are the same as for two-way switching, but a special intermediate switch is wired into the three-core-and-earth linking cable between them. An intermediate switch has four terminals. Light Switch Wiring Diagram - Easy Do It Yourself Home Need a Light Switch Wiring Diagram? Whether you have power coming in through the switch or from the lights, these switch wiring diagrams will show you the light. This light switch wiring diagram page will help you to master one of the most basic do it yourself projects around your house.. Wiring a Light Switch | Wiring a Ceiling Rose | DIY Doctor The switch wires are added as shown in the ceiling rose diagram above and connected to the switch also as shown. The light fitting is then connected also as shown. All connections must be made before the final connection to the live circuit, which must be turned off while connection is made.