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Lightning

Strike Risk Assessment

IEC/BS EN 62305-2

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IEC/BS EN 62305-2

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Assessment inputs

Parameters

Parameters Risk Selection Structures Environment Lines Zones Protection Financial

Questionnaire inputs

Calculation Parameters

Paste the source values, design information, and approved assumptions required for this calculation.

This record will appear in generated report section 4, Questionnaire and Approved Assumptions.

Assessment inputs

Risk Selection

Parameters Risk Selection Structures Environment Lines Zones Protection Financial

Evaluation standard

Risk Assessment Standard

Risks to be considered

Risk Selection

Assessment inputs

Environment

Parameters Risk Selection Structures Environment Lines Zones Protection Financial

Keraunic Map

Indicative average thunderstorm days per year

World keraunic map showing average thunderstorm days per year

Confirm the selected TD or NG value using an accepted project or authority source.
NgGround flash density used for dangerous event frequency.
CESelected CE = 1.00000 environmental factor.
Selected Ng 1.000
Selected CE 1.00000
Active standard EN 62305-2
Assessment inputs

Structures

Parameters Risk Selection Structures Environment Lines Zones Protection Financial

Structure dimensions

Collection area AD0.00 m2
Collection area AM0.00 m2
Greater collection area AD'0.00 m2

AD = L x W + 2 x (3 x H) x (L + W) + pi x (3 x H)^2

Adjacent structure at far end

Parameters for NDJ when a structure is connected to the far end of the line

Rectangular with flat roof
H W L
KS1 Boundary shielding factor from BS EN 62305-2:2012 B.5. Grid-like shields use KS1 = 0.12 x wm, limited to 1; continuous metal shields with thickness above 0.1 mm use KS1 = 0.00010.
Assessment inputs

Lines

ParametersRisk SelectionStructuresEnvironmentLinesZonesProtectionFinancial

Power Line

Line identity, quantity, length, installation and environment factors. Count only independent routes; overlapping routes with the same routing are assessed once using the worst characteristics.

Selection / Input
Value / Coefficient

Shielding and line probabilities

Factors CLD, CLI, PLD and PLI from Annex B

Selection Field
Calculated Value

Internal system factors

KS1 and KS2 screening, KS3 from Table B.5 and KS4 from formula B.7

Selection Field
Value / Coefficient
Assessment inputs

Zones

ParametersRisk SelectionStructuresEnvironmentLinesZonesProtectionFinancial

Zone definition

Zone identity, LPZ classification and persons in the zone

Reduction and hazard factors

Tables C.3, C.4, C.5 and C.6

Specific fire load notes

Guidance for fire and explosion risk classification

NOTE 6 In case of a structure with risk of explosion, the value for rf may need a more detailed evaluation.

NOTE 7 Structures with a high risk of fire may be assumed to be structures made of combustible materials or structures with roofs made of combustible materials or structures with a specific fire load larger than 800 MJ/m².

NOTE 8 Structures with an ordinary risk of fire may be assumed to be structures with a specific fire load between 800 MJ/m² and 400 MJ/m².

NOTE 9 Structures with a low risk of fire may be assumed to be structures with a specific fire load less than 400 MJ/m², or structures containing only a small amount of combustible material.

NOTE 10 Specific fire load is the ratio of the energy of the total amount of the combustible material in a structure and the overall surface of the structure.

NOTE 11 For the purposes of this part of BS EN 62305, structures containing hazardous zones or containing solid explosive materials should not be assumed to be structures with a risk explosion if any one of the following conditions is fulfilled:

  1. the time of presence of explosive substances is lower than 0,1 h/year;
  2. the volume of explosive atmosphere is negligible according to EN 60079-10-1[3] and EN 60079-10-2[4];
  3. the zone cannot be hit directly by a flash and dangerous sparking in the zone is avoided.

NOTE 12 For hazardous zones enclosed within metallic shelters, condition c) is fulfilled when the shelter, as a natural air-termination system, acts safely without puncture or hot-spot problems, and internal systems inside the shelter, if any, are protected against overvoltages to avoid dangerous sparking.

Typical loss values

Tables C.2, C.7, C.8, C.10 and C.12

Assessment inputs

Protection

Acceptable

Within tolerable risk

Excessive

Action required

ParametersRisk SelectionStructuresEnvironmentLinesZonesProtectionFinancial

Protection measures

Selected Protection

PB

Lightning Protection System for R1

SPD

Service and Data Line Protection for R2

Comparison summary

Risk With and Without Protection

Assessment inputs

Financial

ParametersRisk SelectionStructuresEnvironmentLinesZonesProtectionFinancial

Cost-benefit assessment

Financial Inputs

Calculation logic Annual protection cost = protection cost x (interest + amortization + maintenance). Residual loss is scaled from the linked unprotected risk to the protected risk. Annual saving = cost of loss - residual loss - annual protection cost.