Method Calculator ~upd~ — Rolling Sphere

[ d \leq \sqrtr^2 - (h - r)^2 - \sqrtr^2 - (H - r)^2 ]

: 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

A smaller sphere (Level I) is more "touchy" and will probe into every crevice, providing the highest level of protection. A larger sphere (Level IV) offers less stringent protection, suitable for ordinary structures. The Core Equation To determine if a point at height ( H ) is protected by a lightning mast of height ( h ) (with ( h > H )), the horizontal distance ( d ) from the mast to the point must satisfy: [ d \leq \sqrtr^2 - (h - r)^2

Introduction