What is the minimum height above grade that grounding conductors must be protected?

• A. 3 ft
• B. 6 ft
• C. 9 ft
• D. 12 ft

Answer: (B)

Grounding conductors need protection from physical damage, so when they’re installed above grade they must be kept at a height that minimizes the chance of impact or contact. Six feet above grade provides a practical clearance that keeps the conductor out of reach of people, vehicles, and typical equipment while still being feasible to install along buildings or in raceways. A lower height, such as three feet, would be more easily damaged or touched, while higher heights like nine or twelve feet aren’t required by this standard and would add unnecessary complexity. Therefore, six feet is the minimum height required.