How are equipment grounding conductors installed with feeders of more than 1,000 volts generally sized?

The sizing of equipment grounding conductors for feeders of more than 1,000 volts is governed by specific guidelines laid out in the National Electrical Code (NEC). Table 250.122 is the designated table for determining the minimum size of equipment grounding conductors based on the rating of the overcurrent protection device. This table provides a systematic approach to ensure that the grounding conductors can effectively handle fault currents, thereby ensuring safety and compliance with electrical codes.

This method is critical because proper sizing of grounding conductors is essential for protecting equipment and personnel in the event of a fault condition. The size of the grounding conductor may vary depending on the ampacity of the circuit protection but must always be referenced from Table 250.122 to ensure standardization and adequacy.

While other options may touch on relevant concepts, they do not focus on the specific requirements for grounding conductor sizing in this voltage range as directly as the reference to Table 250.122, which is explicitly designed for this purpose.