01
(1) Requirements for grounding electrical equipment in an environment with explosive gases
1. In an explosion hazard environment, the metal shell of electrical equipment should be reliably grounded.
2. All electrical equipment in Zone 1 with explosive gas atmospheres and other electrical equipment except lighting fixtures in Zone 2 shall use special grounding wires.
3. The grounding trunk should be connected with the grounding body in no less than two places in different directions in the explosion hazard area.
4. The grounding device of electrical equipment and the grounding device of the independent lightning rod should be set up separately, and the grounding device of the lightning rod on the building can be combined and set.
02
(2) Grounding requirements for electrical equipment in explosive dust environments
1. The metal shell of electrical equipment in an explosive dust environment should be reliably grounded.
(1) All electrical equipment in the 10 area of explosive dust atmosphere shall have a special grounding wire.
(2) All electrical equipment in the 11 area of explosive dust atmosphere can use metal pipelines or metal components with reliable electrical connections as grounding wires (PE lines), but pipelines for transporting explosive hazardous substances shall not be used.
2. In order to improve the reliability of grounding, the grounding trunk should be connected with the grounding body in different directions and no less than two places in the explosion danger area.
03
(3) Grounding requirements for electrical equipment in a fire hazard environment
l. The metal shell of the electrical equipment should be reliably grounded.
2. There should be no less than two places connected to the grounding body on the grounding trunk.
| There are explosive gases environment | There is explosive dust environment | There is a fire hazard environment | |
| Metal casing for electrical equipment | Reliable grounding | Reliable grounding | Reliable grounding |
| Grounding trunks | No less than 2 places are connected to the grounding body | No less than 2 places are connected to the grounding body | No less than 2 places are connected to the grounding body |
| Specialized grounding wire | All electrical equipment in Zone 1; Other electrical equipment in the 2nd area except lighting fixtures. | All electrical equipment in Zone 10 |
04
(4) Requirements for anti-static grounding devices
l. The anti-static grounding device can be set together with the grounding device of anti-induction lightning and electrical equipment. Only the grounding device of anti-static is used, and the grounding resistance of each grounding body should meet the design requirements.
2. The anti-static grounding wires of equipment, units, storage tanks, pipelines, etc. shall be connected separately with the grounding body or grounding trunk line, and shall not be connected in series with each other except for parallel pipelines.
3. The installation of anti-static grounding wire should be connected with fixed grounding terminals or bolts of equipment, units, storage tanks, etc., and the connecting bolts should not be less than M10, and there should be an anti-loosening device and coated with electric composite grease.
4. For storage tanks with a capacity of 50m3 and above, the grounding points should not be less than 2, and the spacing of the grounding points should not be greater than 30m, and should be symmetrically connected with the grounding body around the bottom of the tank, and the grounding body should be connected into a closed loop in the ring.