How to classify lightning protection classification

July 11, 2019

Q: How do you classify mine lightning protection?

A: Lightning protection classification of buildings:

Buildings should be classified into three categories according to the lightning protection requirements according to the importance of the buildings, the nature of their use, and the possibility and consequences of a lightning accident.

First, in areas where lightning strikes may occur, one of the following situations shall be classified as the first type of lightning protection structure:

1. Any dangerous building that manufactures, uses, or stores explosives and their products will cause explosions and detonation due to electric sparks, which can cause great damage and personal injury.

2. Buildings with explosion hazards in Zone 0 or Zone 20.

3. Buildings with explosion hazards in Zone 1 or Zone 21 will cause explosions due to electric sparks, causing huge damage and personal injury.

2. In areas where lightning strikes may occur, one of the following situations shall be classified as a second type of lightning protection structure:

1. State-level buildings protected by key cultural relics.

2. State-level halls, office buildings, large-scale exhibitions and Expo buildings, large railway stations and airports, state-owned hotels, state-level archives, and important water pumping rooms in large cities. Note: The airport does not contain open space and runways for parked aircraft.

3. National-level computing centers, international communications hubs and other buildings that are of significance to the national economy.

4. National Special Class and Class A Large Stadium.

5. Dangerous buildings where explosives and their products are manufactured, used or stored, and electric sparks are not likely to cause explosions or cause great damage and personal injury.

6. Buildings with explosion hazard in Zone 1 or Zone 21, and electric sparks are not likely to cause explosion or cause great damage and personal injury.

7. Buildings with explosion hazard in Zone 2 or Zone 22.

8. An open-air steel closed gas tank with explosion hazard.

9. Departments, provincial office buildings and other important or densely populated public buildings and fire hazard sites where the number of lightning strikes is expected to be greater than 0.05 times per year.

10. General civil buildings or general industrial buildings such as houses and office buildings where the number of lightning strikes is expected to be more than 0.25 times per year.

3. In areas where lightning strikes may occur, one of the following situations shall be classified as a third type of lightning protection structure:

1. Provincial-level key cultural relic protection buildings and provincial archives.

2. Departments, provincial-level office buildings and other important or densely populated public buildings and fire hazard locations where the number of lightning strikes is expected to be greater than or equal to 0.01 times/a and less than or equal to 0.05 times/a.

3. General civil buildings or general industrial buildings such as houses and office buildings where the number of lightning strikes is expected to be greater than or equal to 0.05 times/a and less than or equal to 0.25 times/a.

4. Isolated high-rise buildings such as chimneys and water towers with heights of 15 m or more in areas with an average thunderstorm day of more than 15 d/a; heights of 20 m or more in areas with an average thunderstorm day of 15 d/a or less Isolated tall buildings such as chimneys, water towers, etc.

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