What is the minimum breaking capacity required for service disconnects as per Article 230?

The minimum breaking capacity required for service disconnects according to Article 230 of the National Electrical Code (NEC) is at least 10,000 amperes. This rating ensures that the disconnect can safely interrupt the maximum potential fault current that could occur in the system, providing necessary protection against overcurrents.

This requirement is grounded in safety considerations. A service disconnect must be able to handle not just the normal operating currents but also any fault conditions that could arise in the electrical system. If a disconnect does not have sufficient breaking capacity, it may fail to operate correctly during a fault, posing a serious safety hazard.

Therefore, the requirement of a minimum of 10,000 A is a crucial aspect of ensuring that electrical systems remain safe and reliable, capable of interrupting excessive currents without catastrophic failures. This standard is in place to protect both equipment and personnel from electrical faults that could lead to fires or other hazards.