The service grounding conductor is sized by what criterion?

The sizing of the service grounding conductor is primarily based on the size of the service entrance conductors. This approach ensures that the grounding system can effectively carry any fault current that may occur, thereby protecting both the electrical system and the individuals using the equipment. The National Electrical Code (NEC) outlines specific requirements for grounding conductor sizing, which typically reference the ampacity of the service entrance conductors.

When sizing the grounding conductor in accordance with the service entrance conductor size, it ensures that the grounding system is adequately robust to handle ground fault currents, promoting safety and compliance with electrical standards. This connection between the grounding conductor and the service entrance conductor provides a reliable path for fault current, helping to prevent equipment damage and reduce the risk of electric shock.