What is the maximum circuit breaker size allowed for a residential lighting circuit?

The maximum circuit breaker size allowed for a residential lighting circuit is 15 amps because this adheres to safety standards outlined in the Canadian Electrical Code. In typical residential applications, lighting circuits are designed to carry a load that provides adequate illumination while ensuring safe operation without the risk of overheating or circuit failure.

A 15 amp circuit breaker is appropriate for lighting circuits because it is capable of handling standard fixture loads and typical usage without being prone to overloads. This rating prevents the risk of fire hazards that can arise from using larger breakers that allow higher loads than the wiring and fixtures can safely support.

The 20 amps and 30 amps options exceed the recommended limit for residential lighting circuits, as they could lead to wiring that does not adequately match the requirements, hence increasing the risk of overheating and potential fire hazards. A 10 amp breaker, while within limits, is generally not utilized for typical residential lighting circuits as it may not provide sufficient capacity for modern lighting needs.

Therefore, a 15 amp breaker strikes a balance between capacity and safety, making it the standard maximum size for residential lighting circuits as per current electrical safety codes.