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Lightning air terminal
(unguyed, unless guy wires
are below RAU antenna level)
Ratio must hold
3 m high X 3 m away
6 m high X 6 m away
Lightning zone of protection
o
(with 45
cone)
0.51m Antenna height
Facility or Building
Wall mount
configuration
Weather protected
Junction
entry point into
box
the building
RAU cables
Telco
cable
Separate ground pit (preferred)
Key
RAU cable
Ground cable or grounding grid
Pre-existing lightening
protection system for building
Figure 27. Grounding a building with existing lightning protection
o
45
3 m
3 m
Antenna
(above
roof)
RAU
High voltage
stand-off
(typical)
3 m
(min)
RAU cable
Primary
ground
#6
ground
Crimp
ring
Lightning protection system
Roof line
Common ground pit (alternative)
Connecting wire when bldg.
has existing system
Standard practices for grounding
Grade
266AA_99
38
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