The branch-circuit rating shall not be less than the noncontinuous load plus what percentage of the continuous load?

The correct answer is based on the standards set for electrical systems, specifically regarding branch-circuit ratings. According to the National Electrical Code (NEC), the branch-circuit rating must be able to handle both noncontinuous and continuous loads effectively.

The requirement states that you must add the total of the noncontinuous load to 125% of the continuous load. This is crucial because continuous loads are those that are expected to run for three hours or more, and these loads can lead to heating issues if not properly accounted for. By using 125% of the continuous load, it ensures that the circuit can safely handle the demands of prolonged use without risk of overheating or tripping.

Understanding this calculation is essential for ensuring electrical safety and compliance with the NEC, thereby preventing potential hazards associated with overloading electrical circuits.