Can a residential lightning protection device use the steel of a building as a grounding electrode?

Residential lightning protection devices should make full use of the underground natural grounding body as the grounding electrode, such as metal pipes, sewers, reinforced concrete foundation steel bars, etc., but there are explosion and fire risk pipelines, such as gas pipes, oil pipelines can not be used as grounding pole. In addition, water pipes and heating pipes cannot be used as ground electrodes. Because lightning strikes on such pipelines, overvoltages may occur on the pipelines and endanger personal safety. While using the natural grounding body, an artificial grounding pole should be set up to make the grounding resistance meet the requirements (10 ohms in general).

It must be pointed out that it is not possible to use only reinforced concrete as the grounding electrode because: (a) Lightning currents penetrate the concrete from concrete and enter the ground. This may cause cracks in the concrete and gradually become damaged, affecting the foundation strength; ) The grounding resistance of concrete varies with the dry and wet soil. It is very low when wet and high when dry. Lightning strikes when dry, due to the high grounding resistance unfavorable to the release of lightning currents, affecting the lightning protection effect. Therefore, for houses or warehouses that store flammable and explosive materials, the grounding pole should not be used only as a base steel bar, and an artificial grounding pole should be provided as a lightning protection grounding pole.

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