1 , the production of standard grounding net
At a distance of 1.5 to 3.0 meters from the building, a trench of 0.8m in depth and 0.6 to 0.8m in depth is drilled with a rectangular frame of 6m by 3m as the center. The two long sides pass through the middle and the L5 (2.5m in length) is used. ×50×50) galvanized angle steel, one vertical at the intersection of the bottom of the trench, a total of six, as a vertical grounding pole; then use four (4 × 40) galvanized flat steel to weld the six angle steel , as a horizontal grounding pole; then use No. 4 galvanized flat steel welded in the middle part of the ground net frame, leading to the outer corner of the machine room, 0.3m high from the ground, as a PE grounding terminal; finally draw more than 16mm2 sheath from the grounding end Ground line, enter the room through the wall along the wall, and connect to the equipotential grounding row in the room.
2, use the building rebar to make the net
When building or renovating a machine room, the steel bars in the concrete columns can be used as grounding devices. Select at least four main reinforcements (diagonal or symmetrical steel reinforcements) in the column, and then use oxygen welding to re-weld two M12 or more copper-threaded tubes protruding from the cylinder. Use this as the grounding terminal, lead to the equipment room, and equipotential. Ground busbars are connected, and the equipotential ground bar can be located below the antistatic floor.
3, the setting of a simple grounding body
In many cases, making a simple grounding body can also achieve effective lightning protection. Using a 20mm diameter iron rod, steel pipe or L5 angle steel, more than 1.5m long, all into the soil. In the case of loose soil and concrete layer on the surface, deeper ground surface should be added.
4, reduce the grounding resistance
After the grounding net is manufactured, the resistance value between the grounding end of the lightning arrester and the grounding body terminal should be measured. In general, the resistance of the grounding resistance should be less than 4Ω, and the high “soil resistivity†area can be relaxed to <10Ω. If it does not meet the requirements, it should first check whether the grounding points are in good contact, and then check whether the grounding wire is thick enough and the length is as short as possible. It can be extended to the ground body, add resistance reducing agent or use graphite metal grounding rods to achieve "ground resistance" requirements can only be used as lightning protection ground. From the weak electricity industry network
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