Chapter 1: About This User Guide
13
Figure 1 Rolling sphere method to determine the lightning protection zones
Assess locations on poles, towers and buildings to determine, whether 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 lightning effects are still possible, but mounting in this zone significantly
reduces the possibility of a direct strike. Mount the equipment in this zone.
Warning
Never mount equipment in Zone A. Mounting in Zone A may put equipment,
structures and life at risk.
General protection requirements
To adequately protect AP installation for both ground bonding and transient voltage, surge suppression is
required.
Basic requirements
Implement the following basic protection requirements:
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Install the equipment in Zone B.
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Ground the AP to the supporting structure.
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If additional surge protection is required, then install one more Surge Suppressor near the AP.
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Install the 56V-Gigabit Surge Suppressor (1000SS) within 600 mm of the point at which the power
cable enters the building or equipment room.
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Ground the drop cable at the entry point of the building.
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Ensure the drop cable is not laid alongside a lightning air terminal.
