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Lightning risk assessment calculator
Risk Analysis lightning according UTE C 17-108
R1 : Relative risk a human life
Parameters
Type
Data
Name
Calculations
Units
Lightning
Density
Country/Region
Ng
Density lightning
strike
STRUCTURE
Width
(m)
W
Length
(m)
L
Height
(m)
H
Tower/
Chimney height
(m)
Hp
Power Supply
Lines
Type
None
Underground
Overhead
Power Supply
Lines
Surface of
capture
Building
Ad1
m2
Tower/
Chimney
Ad2
m2
Structure
Ad
m2
Power
Supply Lines
Ai
m2
Location of
the structure
Structure located in a place where there are other strucures or trees of identical or greater height
Structure surrounded by lower structures
Isolated structure, no other structures closer than a distance of 3H
Isolated structure at the top of a hill
Cd
Location of
the structure ?
Yearly
number of
dangerous
events
On the
structure
Nd
On the Line
Ni
Risk for
human beings
No risk
Low risk (2 stoeys max – 100 pers. Max)
Medium risk (100 to 1000 pers.)
Difficult evacuation (hospitals, disabled pers..)
High risk (> 1000 pers.)
h
Danger ?
Risk of fire
Low
Medium
High
rf
Risk of
fire ?
Occupation
Structure
Commonly occupied
Unoccupied
Lf
Occupation ?
Probability of
damage due to
direct lightning
discharge
On the
structure
Lightning air terminal :
None
Required
Np=IV (NFC 17-100) or Np= III (NFC 17-102)
Np=III (NFC 17-100) or Np= II (NFC 17-102)
Np=II (NFC 17-100)
Np=I (NFC 17-100) or Np= I (NFC 17-102)
Pd
1
Protection
level ?
On the line
SPD :
None
Required
12,5 kA
75/m.n
100/m.n
Pi
1
Risk for
human life
R1
Risk assessment results
Uncomplete
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