A load that is expected to last for 3 hours or more would fall under which classification?

A load that is expected to last for 3 hours or more is classified as Continuous Duty. This classification typically refers to operations that run for extended periods, usually defined as three hours or more without interruption, and often involves equipment designed to operate continuously without overheating or requiring downtime for cooling. Continuous duty circuits are designed to handle the steady and prolonged demand without risk of failure or degradation.

In contrast, Short Duty classifications usually refer to loads that operate for shorter periods, typically less than three hours, while Intermittent Duty refers to loads that are turned on and off at intervals, and Peak Duty is associated with short bursts of heavy load, often for a much briefer duration. Continuous Duty reflects a sustained operation, which is why it is the appropriate classification for loads lasting three hours or more.