cnReach N500 User Guide
InstallationSafety
phn-4673_002v000 (March 2018)
5-3
Note
International and national standards take precedence over the requirements in this guide.
Lightning protection zones
Use the rolling sphere method (see figure below) to determine where it is safe to mount equipment. An
imaginary sphere, typically 50 meters in radius, is rolled over the structure. Where the sphere rests
against the ground and a strike termination device (such as a finial or ground bar), all the space under
the sphere is considered to be in the zone of protection (Zone B). Similarly, where the sphere rests on
two finials, the space under the sphere is considered to be in the zone of protection.
Rolling sphere method to determine the lightning protection zones
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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