What is the minimum distance for grounding metallic objects relative to the external grounding electrode system?

• A. Within 6 ft
• B. Within 3 ft
• C. Within 10 ft
• D. Within 20 ft

Answer: (A)

Keep all metallic objects that could become energized at the same electrical potential as the grounding system by bonding them to the external grounding electrode system within a short distance. The guideline sets six feet as the upper limit for where that bonding connection should be made so the path to the earth remains low impedance. If the bonding point is farther away, impedance can rise and voltage differences (touch/step voltages) may appear during faults, increasing shock risk. Shorter distances satisfy the requirement, but once you exceed six feet you’re no longer within the allowed range, which is why longer distances such as ten or twenty feet wouldn’t meet the standard.