What is the minimum trade size for pipe or conduit used as a grounding electrode?

The minimum trade size for pipe or conduit used as a grounding electrode is ¾ inch. This size is specified by the National Electrical Code (NEC) because it provides adequate conductivity and structural integrity to serve as an effective grounding electrode. Using a properly sized grounding electrode is critical for ensuring that electrical systems are safely grounded, which protects against electrical faults and helps maintain system stability.

This specific size is universally applied in electrical installations to ensure reliability and safety in the grounding system. Larger sizes, while permissible, may be unnecessary for most standard applications. The standardization of this size helps maintain consistency across installations, making maintenance and inspections easier. It's essential to adhere to these standards to comply with electrical codes and ensure the safety and efficiency of electrical systems.