Protection Requirements On A High Rise Building; Figure 2-5 Grounding And Lightning Protection On Building - Motorola PTP 250 User Manual

PTP 250 User Guide

Protection requirements on a high rise building

If the ODU is to be mounted on a high rise building, it is likely that cable entry is at roof
level (Figure
to the general protection requirements (above), the following requirements must be
observed:
•
The ODU must be below the lightning terminals and finials.
•
A grounding conductor must be installed around the roof perimeter, to form the main
roof perimeter lightning protection ring.
•
Air terminals are typically installed along the length of the main roof perimeter
lightning protection ring typically every 6.1 m (20 ft).
•
The main roof perimeter lightning protection ring must contain at least two down
conductors connected to the grounding electrode system. The down conductors should
be physically separated from one another, as far as practical.

Figure 2-5 Grounding and lightning protection on building

Air terminal (finial)
Tower grounding
conductor
phn-2182_003v004 (Oct 2011)
2-5) and the equipment room is several floors below
ODU
To equipment area
Building ground ring
CAT5e cable: gel-filled, shielded
with copper-plated steel
PTP 250 ground cables
Building ground system
AC
service
UNDER DEVELOPMENT
Grounding and lightning protection
(Figure 2-6). In addition
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