# Lightning Protection Risk Assessment Calculator

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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.

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 danger 1 Low panic level(<=2 floors, < 100 persons 2 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 environment 20 Contamination of surroundings or environment 50

### 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 unoccupied 0.1 Structure normally occupied 0.01

### 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 trees 0.25 Structure surrounded by similar or lower objects 0.5 Isolated structure-No other objects nearby 1 Isolated structure on top of a hill or a hillock 2

### 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.

 Explosion 1 High 0.1 Ordinary 0.01 Low 0.001

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1. Ruben Benitez
Mar 05, 2017

Necesitaria software en Esoañol.
Gracias

Ruben Benitez
Tierra del Fuego – Argentina

2. Terens Katzao
May 13, 2016

Wow! I like the software, I compared its results with a risk assessment that I did manually and the two results are almost similar.

Dec 16, 2015

Hello

Thanks

• Edvard
Feb 22, 2016

Try now, it’s fixed.

4. George
Sep 13, 2015

Hi, can I get the LPL / Class after I do this risk assessment? I have a task to determine LPL of a structure and still cannot find calc that will give me an answer to it.

5. kslim
Mar 06, 2015

I have a question.
How can i see the calculation result? I can not see the result after enter some information..
Excel sheet only one and It’s locked even..
Please give me a instruction. Thanks.

6. kslim
Mar 05, 2015

I have a question.
How can i see the calculation result? I can not see the result after enter some information..
Excel sheet only one and It’s locked even..
Please give me a instruction. Thanks.

7. ABDULRAHMAN HASSAN MOHAMED
Mar 04, 2015

Dear manger,
i have roof top with 13 meters width and 19 meters length and the high of the building is
45 meters,
will you please give the total copper that imus use thank you

8. Mark
Mar 03, 2015

Its a great software, thanks!!
There is a question about Occupation coefficient of structure that I don’t really understand what it means.And I couldn’t find any similar parameter in 62305-2.

9. Rajan Varma
May 31, 2014

really it will be great to calculate the lighning stike for high rise building. thanks

10. Gianni Burioli
Feb 06, 2014

Hi
Great software and very useful
Can I have the mail address of the author of this software?
I would suggest some improvements
Regards
(I’m a engineer)

11. st01
Sep 26, 2013

big thanks