What must be true for equipment grounding conductors installed with feeders of more than 1,000 volts?

The requirement that equipment grounding conductors installed with feeders of more than 1,000 volts must generally be sized according to Table 250.122 is important for ensuring electrical safety and proper operation of the grounding system. The purpose of an equipment grounding conductor is to provide a path for fault current to safely return to the ground, which helps to protect against electrical shock and equipment damage.

Sizing according to this table ensures that the conductor can handle the potential fault current without overheating or causing a hazardous condition. The table provides specific sizing guidelines based on the ampacity of overcurrent protection devices. This means that the size of the equipment grounding conductor is directly related to the potential electrical load and associated safety measures of the installation.

Grounding conductors play a critical role in maintaining electrical safety standards, and this sizing requirement helps to mitigate risks associated with electrical faults in systems operating above 1,000 volts. Proper sizing helps ensure that the grounding system will function effectively in case of a fault condition.