Group Meaning of Application Range of Explosion-Proof Lighting Power Distribution Box
2023-08-31 11:10:44
Explosion-proof lighting power distribution box cast aluminum alloy shell or steel plate welded by the electrical components of the main cavity and wiring increase security cavity, the surface of high-pressure electrostatic spray, the main cavity filled with molded case circuit breakers. Micro-switches and other electrical components, Stainless steel exposed fasteners, steel or cable wiring can be.
Scope of application
Zone 1 and Zone 2 hazardous locations
Class IIA, IIB, and IIC explosive gas atmospheres are required when class IIC is required
Flammable dust environment Zone 20, Zone 21, Zone 22
The temperature group is T1-T6 environment
Applicable range meaning
1.1 Division of Explosive Gas Environment Hazardous Areas
Different countries and regions divide explosion hazardous areas according to their respective standards. According to the frequency and duration of the occurrence of explosive gas mixtures in China, the explosive gas environment is divided into Zone O, Zone 1 and Zone 2. (consistent with IEC International Electrotechnical Commission)
Zone 0: Continuous or prolonged exposure to explosive gas mixtures.
Zone 1: The environment in which explosive gas mixtures may occur during normal operation.
Zone 2: The environment in which explosive gas mixtures cannot occur during normal operation, or even the presence of explosive gas mixtures that are present for a short period of time.
Zone 0 generally exists only in sealed containers, internal gas spaces such as tanks, and is rarely present in the actual design process. Most of the cases are in Zone 2.
1.2 explosion-proof electrical equipment is divided into two categories:
Class I coal mine underground electrical equipment
Class II electrical equipment used in areas other than mines
1.3 Class II electrical equipment is divided into three categories, IIA, IIB and IIC, according to the maximum test safety clearance or minimum ignition current ratio applicable to explosive gas mixtures; it is divided into six groups of T1-T6 according to the maximum surface temperature.
1.4 Explosive gas mixtures are grouped by ignition temperature, see Table 1.
1.5 Explosive gas mixtures are classified according to their maximum test safety clearance (MESG) or minimum ignition current ratio (MICR), see Table 2.
Table 1
Group - ignition temperature t (°C)
T1----450
T2----300
T3----200
T4----135
T5----100
T6----85
Table 2
Category ---- Maximum Test Safety Gap (MESG) (mm) ---- Minimum Ignition Current Ratio
IIA----≥0.9---->0.8
IIB----0.5
IIC----≤0.5----<0.45
Properties: The ratio of the minimum ignition current of gas and vapor explosive mixtures to the minimum ignition current of methane explosive mixtures under the specified test conditions. China stipulates that the gas and vapor hazardous materials have a minimum ignition current of scores IIA, IIB, and IIC. The minimum ignition current ratio ≤1.0,>0.8 is IIA; ≤0.8,>0.45 is IIB; ≤0.45 is IIC. For example, ethane, ethylene, and acetylene are classified as IIA, IIB, and IIC dangerous substances, respectively.
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