What action is required for a circuit breaker that has interrupted a fault near its interrupting rating?

The required action for a circuit breaker that has interrupted a fault near its interrupting rating is to inspect and test it according to the manufacturer’s instructions. This is critical because a fault condition, especially one that approaches or exceeds the interrupting capacity of the breaker, can potentially cause damage to the breaker’s internal components. Simply resetting the breaker or continuing to use it without a thorough inspection could lead to further electrical failures or dangerous conditions.

The manufacturer's instructions typically provide specific guidelines for evaluating the functionality and safety of the breaker after such an event. Inspections may include visual checks for physical damage, testing to ensure the breaker operates correctly under load, and verification that all internal mechanisms are intact.

By following these protocols, electrical professionals can ensure safety and reliability in the electrical system following fault interruptions. This practice also aligns with NFPA 70E guidelines, which emphasize a protective and preventative approach to electrical safety.