For a load to be considered continuous, it must operate for at least how many hours without interruption?

A load is classified as continuous if it operates for a minimum period of 3 hours without interruption. This definition is established in the National Electrical Code (NEC) to ensure that circuits and equipment are designed to handle loads that are sustained over extended periods.

For certain applications, loads that are classified as continuous carry implications for sizing conductors, circuit breakers, and overall system design. By establishing a clear threshold of 3 hours for continuous operation, the NEC ensures that electrical installations are safe and capable of handling expected load demands for longer durations without risk of overheating or failure.

Understanding this classification helps electrical professionals design systems that meet safety and performance standards.