Annex C: Calculation for the application of storm warning systems.

The IEC 62793 - 2016 Storm Warning Systems standard guidelines a calculation to specify the degree to which the installation of a lightning prevention system . is recommended. The regulations are based on the following table:

Worst loss severity (as result of Tables 1-5) Implementation of adequate TWS
I Very highly recommended
II Highly recommended
III Recommended
0 Not recommended

At the following form, following the current regulations criteria, you will know what is the recommended level of the thunderstorm warning systems application you need:


Calculation of the recommended prevention level:

Situations
1
People in open areas without an appropriate lightning protected shelter available (according to the IEC 62305 series or other IEC standards): outdoor activities, sports (football, golf, etc.), competitions, crowded events, farming, ranching or fishing activities, beaches, leisure areas
Leisure and relaxation areas, hotel complexes, campsites, amusement parks, beaches
Outdoor activities , golf camps, sports facilities, race circuits and / or crowded events that gather more than 100 people
Activities or works in open areas, ports, agricultural extensions, mining or others
2
Safeguard of sensitive goods: computer systems, electric or electronic controls, emergency, alarm and safety systems
Alarms or fire control units
People or vehicles' access control systems
Home automation systems
PLC's, robotic assembly lines
3
Losses in operations and industrial processes
4
Structures containing dangerous substances (inflammable, radioactive, toxic and explosive materials)
5
Basic services whose continuity, quality or fast recovery shall be guaranteed:
Hospitals
Calculation and / or data processing centers
Industries of continuous production or with processes without interruption
6
Infrastructures: ports, airports, railroads, roads, motorways cableways
7
Safety at workplace (activities that imply a risk at workplace in case of thunderstorm)
8
Zones that need civil or environmental protection: prevention of forest fires, etc.
9
Buildings, transport or facilities with their external areas open to the public.
10
Other situations

Determination of type of loss

Loss concerning people

Loss
Category of loss
Loss of human life
I
Serious injuries to people
II
Minor injuries to people
III
No injuries to people
0

Loss concerning goods

Loss
Category of loss
Loss of valuable goods
I
Loss of common value goods
II
Minor losses of goods
III
No loss
0

Loss concerning services

Loss
Category of loss
Loss of valuable services
I
Loss of common services
II
Minor losses of services
III
No loss
0

Loss concerning environment

Loss
Category of loss
Environmental disaster
I
Damages to environment
II
Minor environmental damage
III
No loss
0

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Risks calculation