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The sphere’s radius is not arbitrary. It is derived from the formula, which relates to the peak lightning current. The most common standard (IEC 62305 and NFPA 780) defines protection levels (I to IV) with corresponding sphere radii:
[ d \leq \sqrtr^2 - (h - r)^2 - \sqrtr^2 - (H - r)^2 ] rolling sphere method calculator
But manual RSM calculations are tedious and error-prone. Enter the —a digital tool that transforms complex 3D geometry into actionable protection zones. This article explains the physics behind the method and how to leverage a calculator for real-world designs. The Physics: Why a Sphere? The Rolling Sphere Method is based on a simple premise: Imagine a sphere of a fixed radius, ( r ), rolling over the terrain and over the structure in question. Where the sphere touches the ground or a lightning protection system (LPS), it represents a point a lightning leader could attach. Any volume that the sphere cannot touch (because it is shielded by a mast, air terminal, or the ground itself) is considered protected. The sphere’s radius is not arbitrary
: Using the formula, the maximum distance is ≈ 18.7 m. Enter the —a digital tool that transforms complex