In residential wiring, what color is typically used for the hot wire?

• A. White
• B. Green
• C. Black or red
• D. Blue

Answer: (C)

In residential wiring, the hot wire is commonly indicated by either black or red insulation. These colors are part of the National Electrical Code (NEC) standards and are used to designate wires that carry current from the power source to the electrical load. The black wire is most frequently used for single-phase circuits, while red wires can be utilized in certain situations, such as in three-phase systems or for switch legs, where two hot wires may be needed.

Understanding wire color conventions is crucial for ensuring safe electrical installations and troubleshooting and for adhering to local codes. While other colors have specific meanings, such as white for neutral and green for ground, black and red specifically indicate that those wires are live and carrying current. This distinction helps to prevent electrical accidents and ensures that wiring systems are installed correctly.