Search

Lightning Protection Risk Assessment Calculator

Home / Download Center / Electrical Software / Lightning Protection Risk Assessment Calculator

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.

Explosion1
High0.1
Ordinary0.01
Low0.001

Continue reading in Manual (available for download below)


Software:Lightning Protection Risk Assessment Calculator
Version:
Developer:Shafqat Ali
Size:578 KB
Price:Free
Download:Right here | Get Download Updates | Get Technical articles
Manual:Right here | Get Download Updates | Get Technical articles
Lightning Protection Risk Assessment Calculator/Spreadsheet
Lightning Protection Risk Assessment Calculator/Spreadsheet

SEARCH: Articles, software & guides

Premium Membership

Premium membership gives you an access to specialized technical articles and extra premium content (electrical guides and software).
Get Premium Now ⚡

Page edited by E.C. (Google).