What is the minimum size of the aluminum equipment grounding conductor required when the overcurrent protection ahead of a branch circuit or feeder is sized at 600 amperes?

The minimum size of the aluminum equipment grounding conductor is determined based on the size of the overcurrent protection device and is specified in the National Electrical Code (NEC). For an overcurrent protection rating of 600 amperes, the NEC provides guidelines that dictate the appropriate size for equipment grounding conductors based on the material used—in this case, aluminum.

According to NEC Table 250.122, when the overcurrent protection is rated at 600 amperes, the required size of the aluminum grounding conductor is indeed 2/0 AWG. This specification ensures that the grounding conductor can safely handle any fault current that may occur, providing adequate protection for equipment and facilitating safe operation of the electrical system.

The significance of this size is underscored by the need to ensure that the grounding system can effectively conduct electrical faults back to the ground, minimizing the risk of shock or fire hazards. Therefore, the selected size meets both the safety requirements and the operational efficiency expected in electrical installations.