What size conductors are recommended for lighting branch circuits?

The recommended size for conductors in lighting branch circuits is 14 AWG. This gauge is commonly used because it can safely handle the typical electrical load associated with residential lighting, which usually consists of 15-amp circuits. The 14 AWG conductor has a current-carrying capacity that typically supports up to 15 amps, which is sufficient for most lighting applications.

Using 14 AWG ensures that the wiring is adequately protected from overheating while providing the necessary power to run lighting fixtures effectively. It strikes a balance between safety, efficiency, and economics, making it suitable for general lighting needs in a residential setting. It's also important to consider that smaller gauge wires, such as 16 AWG, may not be able to handle the required load, potentially leading to overheating and circuit failures. Conversely, larger gauge wires like 10 AWG or 12 AWG are generally overkill for lighting circuits and can be more expensive and harder to work with for such applications. Thus, 14 AWG is the optimal choice for standard lighting circuits in residential wiring.