
Chapter 3: System planning
Site planning
Page 3-9
Lightning protection zones
Use the rolling sphere method (
Figure 45
) 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.
Figure 45
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.
Содержание PMP 450 AP
Страница 1: ...33F Cambium 450 Platform User Guide System Release 15 2 pass...
Страница 14: ...Contents Page xii 450m overload I Glossary III...
Страница 91: ...Chapter 2 System hardware System Components Page 2 27 Figure 16 Gigabit Enet Capable power supply...
Страница 104: ...Chapter 2 System hardware Cabling Page 2 40...
Страница 139: ...Chapter 3 System planning Typical deployment Page 3 6 Figure 44 GPS receiver tower or mast installation...
Страница 157: ...Chapter 3 System planning Radio Frequency planning Page 3 24 Figure 49 Sector Antenna...
Страница 158: ...Chapter 3 System planning Radio Frequency planning Page 3 25 Figure 50 cnMedusa Antenna...
Страница 189: ...Chapter 3 System planning Remote AP Deployment Page 3 56 Figure 59 Remote AP wired to SM that serves as a relay...