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Lightning Risk Assessment Study

Lightning Risk assessment Study is actually the measure of risk of a lightning strike and probability of damages. It assesses the lightening risks to the facility according to international standards requirements.

Lightning Protection Risk Assessment Calculator
Lightning Protection Risk Assessment Calculator (photo: An epic storm over city of Kosice (Slovakia) with lightning bolts blasts too close for comfort by Martin Lajs via Flickr)

These calculations are according to IEC Standard 62305-2.

All these calculations are based on:

  • lightning strike density in that particular area (provided by OMV i.e. Ng = 8),
  • Danger for people,
  • Occupation coefficient of structure,
  • Relative location of site,
  • Fire Risk,
  • Associated services,
  • Electrical Lines,
  • Lightning Protection Level,
  • Surge Arrestor and
  • Dimensions of installation.

Brief introduction of all are given below.

Lighting Strike Density (Ng)

It is the measure of lightning strikes per kilometre square per year in the particular area.

Higher the lighting strike density, higher the probability of lightning strike which needs higher level of lightning protection level.

Danger for People (h)

It is the factor of presence of people and panic in the building in case of a lightning strike.

No particular danger1
Low panic level(<=2 floors, < 100 persons2
Medium risk of panic (< 1000 persons)5
Difficult to evacuate (disabled people, hospitals)5
High risk of panic (> 1000 persons)10
Hazard for surroundings or environment20
Contamination of surroundings or environment50

Occupancy Coefficient (Lf1)

It is the risk reduction factor with respect to theoccupancy of the building / installation. For example, loss due to lighting strike is higher in hospital as compared to a store / warehouse.

Structure unoccupied0.1
Structure normally occupied0.01

Relative Location of Site (Cd)

It is the risk reduction factor with respect to the location and surrounding of the building / installation. For example, chance of lighting strike is minimized if the building is near to a high tower.

Structure surrounded by higher objects or trees0.25
Structure surrounded by similar or lower objects0.5
Isolated structure-No other objects nearby1
Isolated structure on top of a hill or a hillock2

Fire Risk (rf)

It is the risk reduction factor with respect to the flammability of the material present in the building / installation. For example, in case of lighting strike, loss will be very high at a gas station as compare to the cement store.


Continue reading in Manual (available for download below)

Software:Lightning Protection Risk Assessment Calculator
Developer:Shafqat Ali
Size:578 KB
Download:Right here | Video Courses | Membership | Download Updates
Manual:Right here | Video Courses | Membership | Download Updates
Lightning Protection Risk Assessment Calculator/Spreadsheet
Lightning Protection Risk Assessment Calculator/Spreadsheet

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  1. Egi Adrian
    Jan 28, 2023

    keep share articles.. i , . i’m working as project consultant need complete version.thank you

  2. Omar Vivas
    Sep 07, 2022

    Could you send me the software for calculations Lightning Protection Risk Assessment Calculator,
    Thanks about.

  3. sasi gopalan
    Jun 06, 2022

    Thanks for the information. I have a project Power station at Kurd, Iraq, where I have to do lighting calculation. I have IEC 60325 all 4 volumes and BS 6651. .The client requirement is to do in accordance with IEC

    Let me work on it

    • SV Raja
      Jun 23, 2022

      Hi, Sasi G, What is the basis of LPL selection.

  4. Camila
    May 05, 2021

    I can’t find a course in risk assessment of LPS. Can you help me, please?

  5. Rafael Arismendi
    Apr 12, 2021

    I’m a Colombian engineer, and I think. It’s a Good thing you lead us to download the software because the norma is so difficult for your interpretation. I have a worksheet in Excel made by me, but at some points, I look confused.
    Thank You.

  6. francisco quintero m
    Feb 02, 2021

    buen dia. donde consigo el software iec Risk assessment ligthing?

    Dec 11, 2020

    Me podrian enviar el soft evaluacion del riesgo por rayo (IEC Risk assessment ligthing)
    Muchas , muchas gracias

  8. Damilare
    Jun 10, 2020

    Great work. Can’t get the software

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