2. In the above example, a vulnerable zone exists immediately above the building.
Equipment in this area is vulnerable to lightning strikes:
3. To remedy this, you can install two towers and ground them so they function as
lightning rods.
4. The previous vulnerable zone has now been eliminated. Equipment in this zone is
now better protected against lightning strikes.
• Equipment in this zone are still not immune from the effects of EMD, but they are
significantly reduced.
• Further details relating to rolling sphere and risk assessment can be found in
IEC/EN62305 and IEC 61024‐1.
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