Basic practice of lightning protection

Relevant regulations on installation of grounding body:

(1) The buried depth of the top surface of the grounding body shall meet the design requirements. When there is no requirement, it should not be less than 0.6m, and the angle steel and steel pipe grounding body should be vertically configured. In addition to the grounding body, the vertical part of the lead-out wire of the grounding body and the welding part of the grounding device should be treated with anti-corrosion; Before anticorrosion treatment, the surface must be derusted, and the residual flux at the welding place must be removed.

(2) The spacing of vertical grounding body should not be less than 3~5 times of its length. The spacing of horizontal grounding bodies should meet the design requirements. When there is no design regulation, it should not be less than 5m.

(3) In addition to the annular grounding body, the grounding body should be buried 3 meters away from the building. It should also be more than 3 meters away from the building entrance or sidewalk. When it is less than 3m, the equalizing belt method should be adopted or the asphalt layer with a thickness of 50~90mm should be laid on the grounding device, and its width should exceed 2m of the grounding device.

(4) After the grounding body is laid, there should be no stones and construction waste in the backfill of foundation pit.

(5) The soil taken out outdoors should not have strong corrosiveness; Backfill soil should be compacted in layers.

(6) When the grounding device consists of multiple sub-grounding devices, isolation cards that are easy to separate shall be set according to the design requirements. The connection between the natural grounding body and the artificial grounding body should be provided with an easy-to-separate disconnection card, and the disconnection card should have protective measures.