What is the maximum duration for a circuit to be operational while still qualifying as an intermittent duty circuit?

The definition of an intermittent duty circuit is one that is not meant for continuous operation but can function for limited periods. In the context of aviation and electrical systems, an intermittent duty circuit generally allows for operation as long as it is followed by an adequate cooling period to prevent overheating.

According to standard practices and guidelines, the maximum duration for such a circuit to remain operational, while still qualifying as intermittent, is typically set at two minutes. This two-minute threshold ensures that the circuit can perform its function without risking damage or failure due to overheating or excessive wear. After this time, the circuit must cool down to ensure its longevity and continued reliability.

Choosing two minutes reflects a balance between functionality and safety in the operation of the circuit, making it the correct answer in this context.