Rolling Sphere Method Calculator Link

| Protection Level | Peak Current (kA) | Rolling Sphere Radius (r) | | :--- | :--- | :--- | | Level I (Highest) | 3 kA | 20 m (66 ft) | | Level II | 5 kA | 30 m (98 ft) | | Level III | 10 kA | 45 m (148 ft) | | Level IV (Lowest) | 16 kA | 60 m (197 ft) |

: The tool instantly shows that at 19 m separation, the top 0.8 m of the arrester remains exposed. You then add a second mast, and the overlapping spheres create full protection up to 28 m separation. rolling sphere method calculator

: How far can the arrester be from the mast? | Protection Level | Peak Current (kA) |

: Never trust manual approximations for critical infrastructure. Run the rolling sphere simulation, verify the red zones, and then build with confidence. About the author: This article is based on principles from IEC 62305 and IEEE 998. Always consult local codes and a licensed engineer for final designs. Always consult local codes and a licensed engineer

: Using the formula, the maximum distance is ≈ 18.7 m.