Grounding system includes grounding electrode, outdoor grounding bus, indoor grounding bus, graphite-based flexible grounding body, grounding jumper, frame grounding, anti-static and so on. Grounding system commonly used materials are equilateral angle steel, round steel, flat steel, galvanized equilateral angle steel, galvanized round steel, galvanized flat steel, copper plate, bare copper wire, steel pipe, etc..
Grounding pole production and installation is divided into steel pipe grounding pole, angle steel grounding pole, round steel grounding pole, flat steel grounding pole, copper plate grounding pole and so on. Commonly used for steel pipe grounding pole and angle steel grounding pole. Grounding device all use galvanized flat steel, all welding points are brushed with asphalt. Grounding resistance should be less than 4 Ω, more than the length of the grounding device should be added.
Measures to reduce grounding resistance in areas of high soil resistivity, soil treatment, commonly used materials are slag, charcoal, calcium carbide slag, lime, salt, etc.; the use of long-lasting resistance-reducing agents; deeply buried grounding body, 5m below the rock; sewage introduction; deep wells buried in the ground 20m.
Most of the outdoor grounding busbar is buried. Grounding wire connection using lap welding, the lap length is: flat steel for the thickness of 2 times, and at least 3 prongs even welding; round steel for the diameter of 6 times; round steel and flat steel connection, the length of the round steel diameter of 6 times; flat steel and steel pipe or angle welding, in order to connect the reliable, in addition to the contact parts should be in the sides of the weld, should also be welded to the arc by the steel strip bent into a card, or directly with the steel strip bent into an arc with the steel pipe or angle welding. Steel pipe or angle welding.
When backfilling, there should not be stones, construction materials or garbage. Indoor grounding bus laying Most of the indoor grounding bus is open, branch line and equipment connected to most of the buried part. Construction should comply with the relevant specification requirements.