CHAPTER 2: SYSTEM HARDWARE
PAGE 2-5
Figure 3 Rolling sphere method to determine the lightning protection zones
Assess locations on masts, towers and buildings to determine if the location is in Zone A or Zone B:
Zone A: In this zone a direct lightning strike is possible. Do not mount equipment in this zone.
Zone B: In this zone, direct EMD (lightning) effects are still possible, but mounting in this zone
significantly reduces the possibility of a direct strike. Mount equipment in this zone.
Warning
Do not mount equipment in Zone A which can put the equipment, structures and life at risk.