Branch circuit ratings for space-heating appliances are considered what type of loads?

Branch circuit ratings for space-heating appliances are classified as continuous loads because they are typically expected to operate for three hours or more during a given time period. The National Electrical Code (NEC) defines continuous loads as those that are expected to run for an extended period, which can lead to sustained demand on the circuit.

When designing electrical systems, understanding that space-heating appliances are continuous loads is essential for ensuring that the circuit can safely handle the electricity without overheating or tripping breakers. This is particularly important because, for continuous loads, the branch circuit must be rated at 125% of the load to prevent overheating and potential failures. This guideline ensures that the circuit can handle the demand of the appliance over its intended operational period.

Understanding the continuous nature of such loads helps electricians and inspectors determine the proper sizing of conductors, breakers, and other components in the electrical system, ensuring safety and reliability.