The term 'Code for Lightning Protection and Grounding of Buildings' may be unfamiliar to many. Below, the editor of the flexible graphite grounding strip manufacturer will explain in detail what are the standards for lightning protection and grounding of buildings.

In order to make the lightning protection design of buildings (including structures, the same below) adopt lightning protection measures according to local conditions, prevent or reduce personal injury and cultural relics and property damage caused by lightning strikes on buildings, and achieve safety, reliability, advanced technology, and economic rationality, this specification is formulated. This specification is applicable to the lightning protection design of newly constructed buildings. This specification does not apply to the lightning protection design of antenna towers, shared antenna television receiving systems, oil tanks, and outdoor chemical installations.

The lightning protection design of buildings should be based on a careful investigation of geographical, geological, soil, meteorological, environmental conditions, lightning activity patterns, and the characteristics of the protected objects. The form and layout of lightning protection devices should be studied in detail. In addition to complying with the provisions of this code, the lightning protection design of buildings should also comply with the current relevant national standards and specifications.

Chapter 2 Lightning Protection Classification

The editor of the flexible graphite grounding strip manufacturer reminds you that buildings should be classified into three categories according to their importance, nature of use, possibility and consequences of lightning accidents, based on lightning protection requirements. When one of the following situations occurs, it should be classified as a Class I lightning protection building:

1、 Buildings that manufacture, use, or store large quantities of explosive materials such as explosives, gunpowder, detonating explosives, and pyrotechnic devices can cause significant damage and personal injury due to explosions caused by electric sparks.

2、 Buildings with explosive hazardous environments in Zone 0 or Zone 10.

3、 Buildings with Zone 1 explosive hazardous environment can cause significant damage and personal injury due to explosions caused by electric sparks.

When one of the following situations occurs, it should be classified as a second-class lightning protection building:

1、 Buildings under national key cultural relics protection

2、 National level halls, office buildings, large exhibition and exposition buildings, large train stations, state hotels, national archives, important water supply pump rooms in large cities, and other particularly important buildings.

3、 National level computing centers, international communication hubs, and other buildings that are of great significance to the national economy and contain a large number of electronic devices.

4、 Buildings that manufacture, use, or store explosive substances, and where electric sparks are not likely to cause explosions or cause significant damage and personal injury.

5、 Buildings with Zone 1 explosive hazardous environment, where electric sparks are not likely to cause explosions or cause significant damage and personal injury.

6、 Buildings with explosive hazardous environments in Zone 2 or Zone 11.

7、 Open air steel enclosed gas cylinders with explosion hazards in industrial enterprises.

8、 Office buildings at the provincial and ministerial levels, as well as other important or densely populated public buildings, with an expected lightning strike frequency greater than 0.06 times per year.

9、 Residential buildings, office buildings, and other general civil buildings with an expected lightning strike frequency of more than 0.3 times per year.

Note: The expected number of lightning strikes should be calculated according to Appendix 1 of this specification.

The editor of the flexible graphite grounding strip manufacturer reminds you that if you encounter any of the following situations, it should be classified as a Class III lightning protection building:

1、 Provincial key cultural relics protection buildings and provincial archives.

2、 The expected number of lightning strikes is greater than or equal to 0.012 times per year and less than or equal to 0

3、 Residential, office buildings, and other general civil buildings with an expected lightning strike frequency of 0.06 times per year or more and less than or equal to 0.3 times per year.

4、 General industrial buildings with an expected lightning strike frequency greater than or equal to 0.06 times per year.

5、 Based on the impact and consequences of lightning strikes on industrial production, as well as factors such as local weather, terrain, geology, and surrounding environment, determine the fire hazard environments in Zones 21, 22, and 23 that require lightning protection.

6、 The editor of the flexible graphite grounding strip manufacturer reminds you that in areas with an average thunderstorm day greater than 15d/a, isolated high-rise buildings such as chimneys and water towers with a height of 15m or more; Isolated high-rise buildings such as chimneys and water towers with a height of 20m or more in areas with an average thunderstorm day of less than or equal to 15d/a.