Question

Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 1,000V phase-to-phase for each Individual device used as a building or structure main disconnecting means rated_________ or more, unless specifically exempted.

Answer 1

Answer: 1000 ampere or more

Step-by-step explanation:

GROUND-FAULT PROTECTION OF EQUIPMENT: THIS IS A SYSTEM WHICH IS DESIGNED IN SUCH AWAY AS TO PROVIDE PROTECTION OF EQUIPMENT FROM DAMAGING LINE-TO-GROUND CURRENTS BY OPERATING A DISCONNECTING MEANS TO OPEN ALL UNGROUNDED CONDUCTORS OF THE FAULTED CIRCUIT. THIS PROTECTION IS PROVIDED AT CURRENT LEVELS WHICH IS LESS THAN THOSE REQUIRED TO PROTECT CONDUCTORS FROM DAMAGE THROUGH THE OPERATION OF A SUPPLY CIRCUIT OVERCURRENT DEVICE.