Motorola PTP 500 Installation Guide download pdf (Page 13)

PTP 500 Installation Guide

phn-2508_005v000 (Mar 2013)

Page 10

3. Grounding and lightning protection

Electro-magnetic discharge (lightning) damage is not covered under warranty.

The recommendations in this document and in the

PTP 500 and PTP 300

Series User Guide

, when followed correctly, give the user the best protection

from the harmful effects of EMD. However 100% protection is neither implied

nor possible.

Lightning protection zones

The rolling sphere method is used 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.

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.

Never mount equipment in Zone A. Mounting in Zone A may put equipment,

structures and life at risk.

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Motorola PTP 500 Installation Guide Page 13