When performing load calculations, what should be included in the continuous load category?

The continuous load category in load calculations refers specifically to those loads that operate for 3 hours or more continuously during normal operation. This definition is crucial because it helps ensure the electrical system is adequately designed to handle such sustained loads without overheating or experiencing long-term stress.

When calculating the total load, it is necessary to consider these continuous loads so that the circuit and equipment can be safely operated without risk of failure or safety hazards. This approach aligns with guidelines often found in electrical codes, which specify the importance of factoring in continuous loads for sizing feeders and ensuring reliable service.

In contrast, appliances with variable usage do not consistently fall under the continuous load category since their operation can vary significantly. Emergency backup systems, while important for overall system reliability, are not classified as continuous loads unless they are regularly used for extended periods. Finally, intermittent equipment usage is characterized by on-and-off operation, which also does not meet the criteria for continuous loading. Thus, including only loads that operate 3 hours or more continuously is essential for accurate and safe load calculations.