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Motion Detectors and Occupancy Sensors Motion detectors and occupancy sensors can detect movement and then cause an event to happen.

Occupancy Sensor Switch Receptacle Wiring

How to Replace an Electrical Outlet The most common reason receptacles need to be replaced is because of physical damage.

Light Switch Wiring

With conventional light switch wiring using NM cable, the NM supplies 120 volts from the electrical panel to a light switch outlet box.

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

15 amp receptacle Blue Wire Nut

Replace Ballasts Light fixtures from the factory are wired with the ballast wires connected directly to the lampholders.

Arc Fault Circuit Interrupters (AFCIs) An AFCI is a receptacle or circuit breaker that is used to open a circuit if an abnormal arc is detected.

GFCI Receptacle Test and Reset Button

Basic Electricity An electrical current (the movement of electrons) happens when there is a potential difference (voltage) between the ends of a conductor.

Conductor Atom

Photocells and Timers Photocells and timers are switches that turn on and off automatically.


Low Voltage Low voltage is defined as 50 volts (V) or less. Common low voltages are 12 V, 24 V, and 48 V.

Ohms Law12 V Example

Electrical Voltages 110, 115, 120, 125, 130, 220, 230, 240, 250 volts, what are all these different voltages? Nominal voltage - 120 volts & 240 volts are the standards to designate a voltage class for residential buildings.

Electrical 101 Homepage

Light Switch Wiring using NM Cable

Multi-wire Branch Circuit in a residential dwelling contains two 120 V wires of different phases (A and B phase) and share one neutral wire as return current.

Multiwire Branch Circuit Open Thumb 2 Lamp Parallel Ballast Wiring Diagram

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

Garage Door Opener Troubleshooting There are two common reasons a garage door opener won’t close.

Garage Door Opener Receiving Eye Thumb

Color Temperature is a bulb color rating that is measured on the Kelvin scale (K). The higher the color temperature, the whiter the color.

Color Temperature Chart Receptacle Tester

How to Test and Troubleshoot Outlets The best way to test a receptacle, including a GFCI, is with a receptacle tester.

120 Volts A Phase Sine Wave Diagram