Electrostatic grounding: Electrostatic grounding only needs to simply touch the equipment that needs grounding to the ground, and the grounding resistance is qualified as long as it is less than 10 ohm 10. But in practice, the smaller the resistance, the better. Because of the small grounding resistance, it can also effectively play the role of lightning protection, which is equivalent to grounding the equipment.
In anti-static engineering, there are two common laying methods of grounding wire in electrostatic protection area:
1. The grounding wire specially led from the buried grounding body is laid separately to the anti-static operation post of the production line. So as to be used for electrostatic leakage. The grounding conductor laid separately usually adopts galvanized iron sheet with a thickness greater than 1mm and a width greater than 25mm, or is introduced separately with a copper core cord with a cross section greater than 4 ~ 6mm.
2. The ground wire in the three-phase five-wire power supply system is adopted, and the neutral wire of the power supply is led out. At the same time, the grounding wire is led out separately as an anti-static grounding bus, which is called "one-point lead-out resistance isolation" in engineering, and the grounding resistance of the main power transformer box to the ground should be less than 4Ω.