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Light Switch Wiring using NM Cable Receptacle Wiring

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

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

Multiwire Branch Circuit Open

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

Occupancy Sensor Switch

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

15 amp receptacle

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

2  Lamp Parallel Ballast Wiring Diagram Blue Wire Nut

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

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

Garage Door Opener Receiving Eye Thumb

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

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.

120 Volts A Phase Sine Wave Diagram

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

Color Temperature is a bulb color rating that is measured on the Kelvin scale (K).

Color Temperature Chart

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


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

Receptacle Tester

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 2 Thumb

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