Figure 26:
Subscriber / Point-to-Point installation diagram
Lightning protection zones
Use the rolling sphere method (Figure 27) 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.
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