A continuous load is defined as a load where the maximum current is expected to last for at least how many hours?

A continuous load is defined as a load where the maximum current is expected to last for at least three hours. This duration is significant because electrical systems are designed to handle continuous loads safely over a prolonged time frame without overheating or risking equipment failure. In electrical standards, particularly the National Electrical Code (NEC), a continuous load is recognized to require careful consideration when sizing conductors and designing circuits to ensure that all components can handle the sustained current without adverse effects.

Understanding this definition is crucial for professionals in the field, as it directly impacts system design, load calculations, and ensuring compliance with safety regulations. Other durations like one, two, or four hours do not fit the definition of a continuous load as established in standard electrical practices.