How often should you clamp the grounding wire to the fence wire on long fences?

How often should you clamp the grounding wire to the fence wire on long fences?

• A. Every 50 Feet
• B. Every 100 Feet
• C. Every 150 Feet
• D. Every 300 Feet

Answer: (C)

Bonding a long fence to the grounding system needs to stay continuous so the fence stays at earth potential and can carry fault current safely. If the bond points are too far apart, a section of the fence could become less effective as a ground path due to resistance, corrosion, or a break in continuity, which raises voltage along the fence during a fault. Placing clamps about 150 feet apart provides a practical balance: the grounding path remains low in impedance across the entire fence, reducing the chance that a single weak spot isolates a long portion from ground. Too frequent clamps add unnecessary cost and labor, while too infrequent clamps (like every 300 feet) increase the risk of a high-resistance section compromising safety.

Bonding a long fence to the grounding system needs to stay continuous so the fence stays at earth potential and can carry fault current safely. If the bond points are too far apart, a section of the fence could become less effective as a ground path due to resistance, corrosion, or a break in continuity, which raises voltage along the fence during a fault. Placing clamps about 150 feet apart provides a practical balance: the grounding path remains low in impedance across the entire fence, reducing the chance that a single weak spot isolates a long portion from ground. Too frequent clamps add unnecessary cost and labor, while too infrequent clamps (like every 300 feet) increase the risk of a high-resistance section compromising safety.