Chapter 5: Installation Mount the ODU, LPU and surge suppressor
Page 20
Protection requirements on a multi-floor building
If the ODU is to be mounted on a high-rise building, it is likely that cable entry is at roof level (Figure 48)
and the equipment room is several floors below. The following additional 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 6.1m (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.
Figure 82 Grounding and lightning protection on building
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