2011 EMC Directory & Design Guide - Interference Technology

surge & transients
A Risk A s s e s s m e n t f o r L i g h t ning Prote c t i o n S y s t e m
Structure Operations
Coefficient
Parameters
Coefficient
Continuity of services not required,
no environmental impact
Continuity of services required,
no environmental impact
1.0
5.0
Collective area (A e
)
26,762 m2
Consequences to the environment 10.0
Surrounding environment (C 1
) 0.5
Table 5. Consequence of interruption of service to the structure.
Lightning flash density (N g
)
16 flashes/yr/km
and SPDs, should be installed. If the Nd/Nc ratio is less
than 1.0, then a lightning protection system is not required.
LIGHTNING RISK ASSESSMENT EXAMPLE
In this example, we need to determine if a new structure that
we are designing should have a lightning protection system
based on the following parameters:
1. Structure size – 100 meters long, 60 meters wide,
15 meters tall
2. The structure is the tallest structure in the vicinity
3. The location of the facility is in St. Petersburg, FL
4. The structure is metal with a metallic roof
Structure type (C 2
) 0.5
Structure contents (C 3
) 3.0
Structure occupancy (C 4
) 3.0
Table 6. Parameters and calculations for lightning risk assessment
example.
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104 interference technology emc Directory & design guide 2011