The trip rating of a circuit breaker used as the main protective device in a panelboard cannot exceed what?

The trip rating of a circuit breaker used as the main protective device in a panelboard cannot exceed the amperage capacity of the busbars in the panelboard because the busbars are the conductive components that distribute power within the panelboard. They have a specific current-carrying capacity that must not be exceeded to ensure safe operation and to prevent overheating or damage.

If the trip rating of the circuit breaker exceeds the capacity of the busbars, it could lead to a failure in the protective mechanism, resulting in potential hazards such as electrical fires or equipment failure. Therefore, it is critical that the trip rating is matched appropriately to the amperage capacity of the busbars to maintain safety and functionality within the electrical system.