Explosion-proof hazardous environment area division
Explosion-proof hazardous environment is divided into explosive gas environment and flammable dust environment according to the physical state of the substances in the place.
1. Explosive gas environment refers to the environment in which the combustion of gas, vapor or misty combustible materials and air mixture under atmospheric conditions is ignited to all unburned mixtures.
2. The flammable dust environment refers to the environment in which the mixture of dust or fibrous combustible materials and air is ignited under atmospheric conditions and burned to all unburned mixtures.
"Electrical Equipment for Explosive Gas Atmospheres Part 14 Classification of Hazardous Locations" GB3836.14 According to the frequency and duration of the occurrence of explosive gas environment, the explosive gas environment is divided into three zones, namely Zone 0, Zone 1 and Zone 2, which is The partition of GB50058 is basically the same in the Code for Design of Electrical Equipment for Explosive Hazardous Environments.
Different standards are inconsistent in the classification of flammable dust environment. According to the frequency and duration of the explosive dust mixture, the explosive dust environment is divided into two zones, namely zone 10 and zone 11; "Electrical equipment for use in flammable dust atmospheres - Part 1 : Electrical equipment with enclosures and surface temperature protection - Section 1 : Technical requirements for electrical equipment" (GB12476.1), according to the frequency of occurrence of flammable dust/air mixtures and The duration and the thickness of the dust layer divide the flammable dust environment into three zones, namely 20 zones, 21 zones and 22 zones.
Explosion-proof hazardous environment categories and regional levels
Explosion-proof hazardous environment is divided into explosive gas environment and flammable dust environment according to the physical state of the substances in the place.
1. Explosive gas environment refers to the environment in which the combustion of gas, vapor or misty combustible materials and air mixture under atmospheric conditions is ignited to all unburned mixtures.
2. The flammable dust environment refers to the environment in which the mixture of dust or fibrous combustible materials and air is ignited under atmospheric conditions and burned to all unburned mixtures.
"Electrical Equipment for Explosive Gas Atmospheres Part 14 Classification of Hazardous Locations" GB3836.14 According to the frequency and duration of the occurrence of explosive gas environment, the explosive gas environment is divided into three zones, namely Zone 0, Zone 1 and Zone 2, which is The partition of GB50058 is basically the same in the Code for Design of Electrical Equipment for Explosive Hazardous Environments.
Different standards are inconsistent in the classification of flammable dust environment. According to the frequency and duration of the explosive dust mixture, the explosive dust environment is divided into two zones, namely zone 10 and zone 11; "Electrical equipment for use in flammable dust atmospheres - Part 1 : Electrical equipment with enclosures and surface temperature protection - Section 1 : Technical requirements for electrical equipment" (GB12476.1), according to the frequency of occurrence of flammable dust/air mixtures and The duration and the thickness of the dust layer divide the flammable dust environment into three zones, namely 20 zones, 21 zones and 22 zones.
Explosion-proof hazardous environment categories and regional levels
| Explosion hazard environment category | Regional level | Location characteristics |
| Explosive gas environment | Zone 0 | a place where an explosive gas environment continuously appears or exists for a long time |
| zone 1 | A place where an explosive gas atmosphere may occur during normal operation | |
| Zone 2 | In normal operation, an explosive atmosphere is unlikely to occur, and if it occurs, it is occasionally occurring and is a short-lived place. | |
| Combustible dust environment | District 20 | Combustible dust continuously or frequently occurs during normal operation, in an amount sufficient to form a mixture of flammable dust and air/or a place where the uncontrollable and extremely thick dust layer may form and the interior of the container |
| District 21 | During normal operation, the amount of dust may be sufficient to form a mixture of flammable dust and air, but not in the 20 zone. This area includes: a location directly adjacent to the point where the dust is filled or discharged, a dust layer and a flammable dust and air mixture that may produce a combustible concentration under normal operating conditions. | |
| District 22 | Under abnormal conditions, flammable dust occasionally appears and is only present for a short period of time, occasionally accumulation of flammable dust or the presence of a dust layer and a flammable dust air mixture. If it is not guaranteed to exclude flammable dust accumulation or dust layer, it should be divided into 21 areas. |
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