The different application area of the explosion - proof cameraExplosive Material Region Definition Chinese Standard North American Standard
Gas (CLASS Ⅰ) Where, in normal circumstances, the explosive gas mixture is present for a long or long time Zone 0 (Zone 0) Div.1
Under normal circumstances the explosive gas mixture is likely to occur in the area 1
Under normal circumstances the explosive gas mixture can not appear, only in the absence of normal circumstances, occasional or short time place 2 area Div.2
Dust or fiber (CLASS Ⅱ / Ⅲ) Under normal circumstances, the mixture of explosive dust or combustible fiber and air may be continuous, short time frequent occurrence or long time place 10 District Div.1
Under normal circumstances, explosive dust or combustible fiber and air mixture can not appear, only in the normal circumstances, occasional or short time place 11 area Div.2
The third bit code
Ⅰ - coal mine, underground electrical equipment
II - factory electrical equipment
No. ④ bit code
Classification of Class Ⅱ Explosive Gas Environments
Class Class Class Level Representative Gas Minimum Detonation Spark Energy Maximum Experimental Safety Clearance MESG (mm) Minimum Ignition Current Ratio MICR
Mine I methane 0.280mJ
Outside the mine plant IIA Propane 0.180mJ MESG≥0.9 MICR> 0.8
IIB ethylene 0.060 mJ 0.9 & gt; MESG & gt; 0.5 0.8 ≧ MICR ≧ 0.45
IIC hydrogen 0.019 mJ 0.5? MESG 0.45> MICR
⑤ bit code
Class II Explosive Gas Environment Electrical Equipment Temperature Group
Temperature Group Natural Temperature T (℃) Common Explosive Gas Equipment Allowable Surface Temperature (℃)
T1 T ≥ 450 hydrogen, acrylonitrile and other 46 kinds of 450
T2 450> T ≥ 300 Acetylene, ethylene and other 47 kinds of 300
T3 300> T≥200 gasoline, butyral and other 36 kinds of 200
T4 200> T≥135 Acetaldehyde, tetrafluoroethylene and other six kinds of 135
T5 135> T≥100 Carbon disulfide 100
T6 100> T ≥ 85 Ethyl nitrate and ethyl nitrite 85 Dangerous sites are divided into different areas depending on the frequency of the explosive environment and the duration. The gas sites are divided into three areas: Zone 0, Zone 1 and Zone 2; Dust sites are divided into three zones: Zone 20, Zone 21 and Zone 22.
Flammable gases, steam and mist gas sites
0 area (red part)
Explosive mixtures in explosive atmospheres occur in the form of gas, steam, or mist for continuous or long periods of time.
Electrical equipment used in Zone 0 shall be designed, tested and identified in accordance with EN50284 and IEC60079-26 for the relevant provisions of the д class, type (gas) electrical equipment.
1 area (orange part)
During normal operation, explosive atmospheres in the form of gases, vapors, or mist may appear in explosive atmospheres. Zone 1 is a typical application for explosion-proof electrical equipment. Standard EN50014 ~
EN 50020, EN 50039 and IEC 60079-0, -1, -2.-7, -11, -18, -25 are provided for electrical equipment used in Zone 1.
2 area (yellow part)
In normal operation, explosive atmospheres in the form of gases, vapors or mist are less likely to occur in explosive atmospheres and, if present, occur only occasionally and for short periods of time.
Often, "short time" means no more than 2 hours of duration.
The standard EN50021 and IEC60079-15 provide for the electrical equipment used in Zone 2, and must also meet the requirements of general insulation resistance, impact energy and dissipation power.
EN50281-1-1 standard for the 20 area of the electrical equipment shell structure and design to do the corresponding provisions. IEC60241-11 complements the electrical equipment used in Zone 20, including intrinsically safe
Explosion and other aspects of the content. 20 area application type 1 (dust) electrical equipment.
Mills, coal, grain warehouses and packaging lines and their surroundings are typical of 21 districts. In the 21 area, may occur due to dust leakage and other reasons to form an explosive dust mixture. In addition,
Electrical equipment surface dust accumulation is also the safety of the factory production risks, should cause enough attention.
Zone 21 shall use Category 2 (dust) Explosion-proof electrical equipment.
In normal operation, the explosive dust mixture is unlikely to occur, only in the event of a fault condition. Area 22 shall use Category 3 (dust) Explosion-proof electrical equipment. If it is explosive
If the dust in the environment is conductive dust, Category 2 (dust) explosion-proof electrical equipment shall be used in accordance with EN50281-1-2. Hazardous location is related to a variety of factors in the field. In general, it is difficult to give clear criteria and definitions for the allocation of hazardous locations. The following factors are closely related to the types of hazardous locations:
1. Physical properties of flammable substances
2. The amount of gas, steam, mist and liquid in the environment
3. Release the state of the source
4. the state of ventilation
5. Measures to prevent the spread of gases, vapors and mist
6. Factors that affect the volatility of flammable gases, vapors, and mist
7. Safety records of the production site
8. The structure and configuration of the equipment and equipment
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