2 per km²)
• Building size: long, wide, high
• Interception area: 4,827 m²
Likelihood lightning strike
• Lightning protection class 86% protective im-
pact Residual risk 14% (0.0022 every 462
years)
Annual damage protected building (not including
costs lightning protection system)
• €500,000 0.
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Chapter General introduction
.2 14% /
1,000,000 4,827 0.6 per km2
• Building size: long, wide, high
• Interception area: 4,827 m²
Likelihood lightning strike
• 3.14)
• Probability risk occurrence: 3.Cost-effectiveness without lightning protection system
Annual costs a
lightning strike (fire,
surge voltage damage)
x-reduced occurrence
probability (lightning
strike into the building)
x
Likelihood occurrence
(lightning strike into the
building)
= Annual costs without
protection measures
Cost-effectiveness with lightning protection system
Annual costs a
lightning strike (fire,
surge voltage damage)
x-reduced occurrence
probability (lightning
strike into the building)
+
Annual costs:
inspection, maintenance, in-
terest
and repairs
= Annual costs with
protection measures
Risk management
Cost
comparison
Example (lightning damage building without light-
ning protection system)
• Value building with contents: €500,000
• Lightning strikes per year: 1.2 1,000,000 m2
x 4,827 m2
= 0.6 per km² (doubled:
≤ 3.015 (total loss) €7,500 per year
Example (lightning damage building with light-
ning protection system)
• Value building with contents: €500,000
• Lightning strikes per year: 1.015 every 65
years)/theoretical value
Annual costs unprotected building
• €500,000 0.0022 €1,000 per year
Calculation costs for the lightning protection sys-
tem
• Costs lightning protection system: €10,000
• Costs/depreciable life (20 years): €500 per year
• Annual interest incurred due investment (5%):
€500
• Annual maintenance costs for the lightning protec-
tion system (5%): €500
• Total annual cost lightning protection system:
€1,500
Annual costs with protective measures (including
costs lightning protection system)
• Annual damage: €1,100 per year
• Total annual cost lightning protection system:
€1,500
• Total costs: €2,600 per year
Example
Through suitable lightning protection measures, annu-
al costs can reduced €4,900
