What color wire is used as the power feed for a switch or an outlet?

The black wire is typically used as the power feed in electrical circuits for switches and outlets. This is a standard convention in residential and commercial wiring. The black wire carries the live or hot current, which supplies power to the device. In a circuit, this wire connects to the power source and delivers electricity to the switch or outlet.

Understanding wire color conventions is crucial for safety and functionality when performing electrical work. Other colors, such as red, may indicate secondary hot or switched wires, yellow is often used for switch legs or travelers in a three-way switch configuration, and white wires are generally used as neutral conductors. It's important to recognize these distinctions to ensure proper wiring and avoid electrical hazards.