
Chapter 3: System planning
Site planning
Figure 29 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
Never mount equipment in Zone A. Mounting in Zone A may put equipment,
structures and life at risk.
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