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Switches are used to control power to a load. They can be found on anything that runs on electricity.

Light Switch Wiring With conventional light switch wiring using NM cable, the NM supplies line from the electrical panel to a light switch outlet box.

Light Switch Wiring using NM Cable

Ballast Wiring A fluorescent tube circuit includes a ballast, wires, lampholders, and the tubes.

2 Lamp Parallel Ballast Wiring Diagram

Fluorescent Ballasts Fluorescent lamps use a ballast which transforms line voltage to a type of power to start up and operate the lamp(s).

Fluorescent Ballast

Replace Ballasts How to replace a fluorescent ballast, including 2, 3, and 4 lamp series and parallel ballasts. Includes a how to replace a ballast video.

1 Lamp Series to 2 Lamp Parallel Lampholder Wiring Diagram

Fluorescent Lampholder Wiring Fluorescent lampholders hold fluorescent tubes in place on a light fixture. Wires from the ballast plug into push-in connectors in the lampholders that connect to the pins of the lamp.

2 Lamp Parallel Ballast Lampholder Wiring Diagram

Basic electricity including electrical definitions, ohm's law, and electrical circuit information including direct and alternating current.

Ohms Law PEIR Symbol Thumb

Wire Connectors are used to connect two or more wires together. There are many types of wire connectors, the most common are twist-on.

Wire Connectors

Electrical Troubleshooting There are certain things that you can do in a home or office to troubleshoot and fix certain electrical problems.

Digital Multimeter

3-way Switch Wiring  How to wire 3-way switches using NM (Romex) cable with wiring diagrams included.

3-way Light Switch Wiring Diagram 1

Dimmer Switches are used to control lighting level and can save energy.

3-way Switches 3-way switches are used to control lights with two switches.

Toggling 3-way Switch Wiring Diagram

Electrical Outlets A receptacle (electrical outlet) is a device that supplies power to an electrical load through a cord and plug.

Outlet Wiring Diagrams showing how outlets are wired using NM cable (Romex). Diagrams also include a dryer outlet and typical ground connections.

Receptacle Wiring Diagram

Split Receptacles A duplex receptacle has removable metal tabs that electrically connect line and neutral together on each receptacle. A split receptacle is a duplex with one or both tabs removed to isolate each receptacle from the other.

Split Receptacle, Same Circuit

4-way Switches 4-way switch configurations are used to control lights with three or more switches.

Toggling 4-way Switch Wiring Diagram

Ceiling Fan Switch Wiring 3-wire cable travels from the switch box and connects to the fan, lights, neutral, and ground wires.

Ceiling fan switch wire makeup

Alternate 3-Way Switch Wiring Diagrams Conventional 3-way wiring is not very complex. However there is an alternate wiring configuration that could cause confusion.

Alternate 3-Way Switch Wiring Diagram 1

Multiple Switch Wiring Multiple light switch wiring using NM cable. Includes wiring diagrams.

Multiple Light Switch Wiring Diagram

Troubleshoot  3-way Switches Usually when a 3-way switch fails, lights can be toggled on and off at one switch, but not the other.

Troubleshoot 4-way Switches Usually when a 3-way or 4-way switch fails, lights can be toggled on and off on all but one switch.

Electrical 101 Homepage

Question or Comment?

Toggling Single Pole Light Switch Light switch and dimmer 3-way Switch Down Position 15 amp receptacle 4-way Switch Down Position