Ceiling Light Switch Wiring
Light switches are certainly one of the most common electrical controls in the house. They’ll control lights, fans, receptacles or some other electrical device. A single-pole switch typically controls simple loads like ceiling lights. With only two terminals, single-pole switches are among the simplest for the home installer to wire. Ceiling light switch wiring is not difficult but it surely does require caution since it involves working with electricity.
The hot wire is the black wire that carries current from the circuit or fuse panel to the ceiling light switch box. At the switch box, it connects to one of the screw terminals on the light switch. The black wire from the switch to the ceiling light connects to the opposite terminal. When the switch is within the on position, the path from the panel to the sunshine is complete, energizing the fixture. When the switch is off, the trail is broken and the present stops on the switch, making the fixture safe.
The white wire running from the panel to the switch box is the neutral, or return, wire. The neutral provides a path for the present to travel from the fixture back to the panel. This completes the electrical circuit and allows the ceiling light to work. The neutral wires connect together in the switch box using a wire nut or similar terminating device.
In the event of a short-circuit or malfunction, the bottom wire provides a safe path for the current to follow to the grounding rod or electrode outside the house. And not using a properly installed grounding circuit, transient current will follow any path to ground it will possibly find. For those who happen to touch an ungrounded switch that has malfunctioned, you might become the trail to ground, resulting in a shock or electrocution. The ground wires within the switch box twist together, with one wire left longer than the others, making a “pigtail.The longer wire connects to the green grounding screw on the light switch.
For ceiling lights controlled by multiple switches, it’s essential to trace and identify the person wires, as some white wires may be acting as hot wires. It is an efficient practice to mark white wires with black tape or paint after they function hot wires, but not every installer follows this practice. It could also be necessary to enlist the services of a certified electrician who has the tools and expertise to identify the proper wires and make the connections safely.
Google Books: “The Complete Guide to Home Wiring: A Comprehensive Manual, from Basic Repairs to Advanced Projects Bryan Trandem; 2001
Hometime.com: Single-Pole Switches
Wiring Help.com; Easy methods to Wire a Switch; Roger; May 2007