Lightning Risk Calculation

Protection against lightning and overvoltage requires one of the most important steps: performing a lightning risk assessment. Just as every building is different, each geography is unique. In Turkey, for example, Antalya, Mersin, and Muğla have a high risk of lightning strikes, and the strikes are particularly strong. Another important factor in lightning risk assessment is that all calculations and engineering must comply with IEC 62305-2 standards. Based on this risk assessment, decisions should be made on how to protect against lightning and which products to select.

Risk Assessment of Buildings

Lightning strikes affecting the building, as a source of damage:

• S1: Directly to the building
• S2: Near the building
• S3: To service installations
• S4: Near service installations

Separation of Lightning Effects:

• D1: Harm to living beings due to touch and step voltages
• D2: Physical damage
• D3: Malfunction of internal systems due to electromagnetic effects

Classification of Losses

Possible losses due to lightning strikes:

• L1: Loss of life
• L2: Loss of public services
• L3: Loss of cultural heritage
• L4: Loss of economic assets

• R1: Risk of loss of life
• R2: Risk of loss of public services
• R3: Risk of loss of cultural heritage
• R4: Risk of loss of economic assets

These values need to be calculated. Each risk component can be expressed using the general equation:

Rx = Nx . Px . Lx

Nx: Annual number of hazardous events

Px: Probability of building damage

Lx: Loss

By calculating this component, it can be determined whether protection against lightning is required based on an acceptable level.

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