1. The metal shell and cable tray of all electrical equipment and other process equipment, including containers, towers, racks, steel ladders, guardrails, etc., shall be firmly grounded, and the incoming and outgoing equipment pipelines and long-distance transmission pipelines shall also be grounded.
2. For the lightning protection and grounding of a single building, the metal components of the building shall be used as the natural grounding body, and the system shall be firmly connected with the grounding body.
3. Work, protection, lightning and anti-static grounding can share a group of grounding system. The actual measurement of power frequency grounding resistance is not greater than 4 ohm resistance to meet the demand. It should be added to the grounding electrode, and the metal shell of all non electrified electrical equipment should not be grounded.
4、接地设备由笔直接接地柱和地面的水平,和钢笔的直接接地柱应∠50 * 50 * 5 L = 2.5米镀锌角钢,接地柱直接进入地面0.8米,水平地面线选择- 40 * 4扁钢,0.7米深。两个接地极之间的距离为5米。接地极与地线应采用焊接方式连接。接地线重叠12cm。
4. For the grounding equipment, the level between the pen direct grounding column and the ground, and the pen direct grounding column shall be ∠ 50 * 50 * 5 L = 2.5 m galvanized angle steel, the grounding column shall enter the ground directly for 0.8 m, and the horizontal ground line shall be - 40 * 4 flat steel, 0.7 m deep. The distance between the two earth electrodes is 5 meters. The grounding electrode and ground wire shall be connected by welding. The ground wire overlaps by 12cm.
5. The distance between the main grounding line and the nearest point of the tank wall and the building shall not be less than 3m
6. The straight section of flat steel returned from the main line shall be subject to anti-corrosion treatment, and the welding slag shall be cleaned and cleaned.
7. See the national standard gb50169-92 for the construction and acceptance of grounding equipment.
The requirements for laying and driving depth of underground galvanized steel pipe for lightning protection and grounding are as follows:
According to article 5.4.3 of GB 50057-2010, the length and distance of direct grounding body shall be 2.5m and 5m respectively, which can be reduced according to local restrictions.
The above is the relevant content introduced by Jinan galvanized pipe manufacturer. For more information, please visit the website: http://www.jnxxjm.com