According to the NEC, a Continuous Load is defined as equipment operating at a maximum load for how many hours?

A Continuous Load, as defined by the National Electrical Code (NEC), refers to a load that is expected to operate at a maximum level for three hours or more. This definition is important in electrical planning and design because it informs how circuits, conductors, and other equipment should be sized and rated to ensure they can handle such loads without overheating or becoming unsafe.

Understanding this definition helps electricians and engineers determine the appropriate capacity of the circuit breakers and other protective devices, as well as prevent issues related to undersized wiring, which could lead to overheating and potential fire hazards. The three-hour threshold also plays a crucial role in load calculations for service demand and overall system reliability.

The other options are incorrect as they state durations shorter than the required three hours, which would not meet the criteria set by the NEC for classifying a load as continuous. Thus, the correct answer aligns perfectly with the NEC's requirement for defining continuous loads, ensuring safe and effective electrical system design.