[ n = \fracPd ]
For an isolated rectangular building:
[ A_d = L \times W + 2 \times (L + W) \times H + \pi \times H^2 ] lightning protection calculation
| 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 = \fracPd ] For an isolated