What is the minimum bending radius specified for grounding conductor runs?

• A. 6 inches
• B. 8 inches
• C. 10 inches
• D. 12 inches

Answer: (B)

Ensuring the grounding conductor is routed with a bend radius that won’t stress or damage the conductor is the key idea. Eight inches is the minimum bend radius because it provides enough clearance to prevent kinking or insulation damage as the run weaves around supports and through fittings, and reduces mechanical stress at terminations where direction changes occur. A tighter bend, like six inches, can cause localized bending strain, insulation damage, or a compromised ground path. Larger radii, such as ten or twelve inches, aren’t necessary for standard grounding runs and can make routing more difficult in constrained spaces. So, eight inches balances protection of the conductor with practical installability in typical environments.