What type of wire is most common for residential lighting circuits?

The most common wire used for residential lighting circuits is typically 12 or 14 gauge NM (non-metallic) wire. This choice is optimal because NM wire is versatile, easy to work with, and adheres to residential wiring codes.

12 gauge wire is commonly employed for circuits that carry a maximum load of up to 20 amps, which is suitable for lighting and general purpose circuits, while 14 gauge wire is generally used for 15-amp circuits. This flexibility allows electricians to effectively meet the diverse needs of residential lighting systems, ensuring safety and adherence to the National Electrical Code (NEC) standards.

Additionally, NM wire is favored for its insulation, which helps protect against damage and increases the overall safety of the electrical system in homes. The use of aluminum wire or heavier gauge wires is less common for typical residential lighting applications due to factors such as potential overheating, increased weight, and handling complications. Therefore, the choice of 12 or 14 gauge NM wire stands out as the most suitable option for residential lighting circuits.