| LPL | Peak current (kA) | Rolling sphere radius (m) | Mesh size (m) | |------|------------------|---------------------------|---------------| | I | 200 (minimum 3) | 20 | 5 × 5 | | II | 150 (min 5) | 30 | 10 × 10 | | III | 100 (min 10) | 45 | 15 × 15 | | IV | 100 (min 16) | 60 | 20 × 20 |
$$N = \frac\textPerimeter of Building\textSpacing Distance$$ lightning protection calculation
Based on the Risk Assessment, the LPS is categorized into four classes (IEC 62305): | LPL | Peak current (kA) | Rolling
: A building ( L = 20,\textm ), ( W = 10,\textm ), ( H = 8,\textm ) ( A_d = 200 + 2(30)(8) + \pi(64) = 200 + 480 + 201 = 881,\textm^2 ) ( W = 10
[ n = \fracPd ]
Note: A minimum of two down-conductors is always required for a structure.