What is the maximum setting for ground-fault protection of equipment?

The correct choice indicates that the maximum setting for ground-fault protection of equipment is 1,200 A. This limit is established in the National Electrical Code (NEC) to ensure the safety and reliability of electrical systems. Ground-fault protection helps prevent damage to equipment and reduces the risk of electrical shocks or fire hazards caused by ground faults.

The NEC defines specific requirements for setting ground-fault protection at various levels of electrical systems, particularly for overcurrent devices like circuit breakers and fuses. The 1,200 A threshold is relevant for larger systems where higher fault currents may occur, allowing for appropriate and safe operational limits while ensuring that the protection devices can function effectively without nuisance tripping.

By adhering to this limitation, electrical systems can maintain a balance between protection and operational efficiency, providing peace of mind to engineers and safety professionals in the field.