What is the rating for overcurrent protection in circuits with noncontinuous loads?

The rating for overcurrent protection in circuits with noncontinuous loads is set at 125% of the load. This is because noncontinuous loads, which are loads that are on for less than three hours in a cycle, can be protected adequately with an allowance for some additional current.

When designing circuits, it's crucial to ensure that the overcurrent protection devices (such as circuit breakers and fuses) can handle the maximum expected load without tripping unnecessarily. By applying the 125% rule, it allows for some margin above the continuous load to accommodate for short-term surges in current demand without compromising the safety and operability of the circuit.

This rating helps in preventing nuisance trips while still providing sufficient protection against overcurrent conditions. Therefore, for noncontinuous loads, overcurrent protection is rated at 125% of the load.