![]() Remember: Always test the wires with a voltage tester to ensure there is no mains supply present before you start disconnecting them. If you are aware that the light switch was functioning correctly prior to replacing the switch plate, simply note the layout of the wires and copy the wiring layout in the replacement switch plate.) (Tip: the plate will be attached to up to three wires. Unscrew the switch plate, pull it towards you slowly and examine how many wires are present and what colour they are. STEP 2 - Remove the Existing Switch Plate For added safety, use a voltage tester to ensure that the circuit is not live and there is no power to the switch. In larger premises such as office blocks or schools where the temporary loss of mains power is likely to inconvenience many people, you may choose to identify and switch off the correct fuse at the fuse panel out of hours. This is via an MCB (miniature circuit breaker) located in the mains consumer unit in more modern homes. The first priority is to ascertain which lighting circuit the new switch is going to be installed on and switch off the power supply. For increased reliability, we recommend using the screw variety of switch plate. There are switches in which wiring must be held in place by a screw, and there are ‘plug-in’ style switches where wiring is held in place by a sprung push-button release mechanism. Modern switches typically come in two varieties. If a switch has failed, the switch must be replaced and rewired. one light switch located at the foot of a stairwell and another located at the top of the stairs) the circuit can be immediately discounted as a single switch circuit. If you are aware that a light may be controlled from two locations (e.g. Earth Wire connects to switch plate/back box Earth ports (Multi-gang switches and two-way circuits require further consideration)įirst, we must identify a one-way light switch.Common Live Wire (CW) connects to Common port. ![]() Switched Live Wire (SW) connects to L1 port.This is an overview of how to wire a one-gang light switch on a one-way circuit: In addition, the light switch will either be 'one-gang' (one switch on the plate) or 'two-gang' (two switches on the plate) or higher. To wire a light switch, consider whether the circuit is ‘one-way’ (one light switch operating one light) or ‘two-way’ (two light switches operating the same light).
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