User Guide

Table Of Contents
PMP 450 Planning Guide
Figure 26) and the equipment room is several floors below (Figure 27). The following additional requirements
must be observed:
The AP 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 6.1m (20ft).
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.
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pmp-0047 (March 2014)