How to Wire a Light Switch - Very Easy - Lighting Tutor How to Wire a Light Switch Learning how to wire a light switch is one of the basic skills that every homeowner should do. As a homeowner, you will likely need to replace a light switch many times and paying an electrician is not optimal when you can do it in just a few minutes. Our instructions on how to wire a light switch for a standard light switch, a three-way light switch and a four-way How to fit outdoor lights | Ideas & Advice | DIY at B&Q You can power your garden lights from a spur off a ring circuit, via a 5 amp fused connection unit. Once outdoors, you should supply your lights via 1² three core steel-wire-armoured cable (SWA). Make sure that you only fit weatherproof lights that are suitable for outdoor use and that your circuit is Light Switch Wiring Diagrams - Do-it-yourself-help This is an updated version of the first arrangement. Because the electrical code as of the 2011 NEC update requires a neutral wire in most new switch boxes, a 3-wire cable runs between the light and switch. The red and black are used for hot and the white neutral wire at the switch box allows for powering a timer, remote control, or other programmable switch.