Explosion-proof rating table Examples of commonly used international explosion-proof electrical equipment signs International Electrotechnical Commission (IEC) Exd[ia]IICT5 CENELEC (European Electrotechnical Commission) EExd[ia]IICT5 Code description Code description Ex Explosion-proof EEx European mark d Protection method (flameproof type ) D Protection method (flameproof type) [ia] Intrinsically safe output related equipment [ia] Intrinsically safe transmission explosion-proof rating table Examples of explosion-proof electrical equipment commonly used internationally International Electrotechnical Commission (IEC) Exd[ia]IICT5CENELEC (European Electrotechnical Commission) ) EExd[ia] IICT5 code description code description Ex explosion-proof EEx European mark d protection method (flameproof type) d protection method (flameproof type) [ia] intrinsically safe output related equipment [ia] intrinsically safe output related equipment II equipment category II Equipment Category C Gas Group C Gas Group T5 Temperature Group T5 Temperature Group Explosion-proof Basic Type Explosion-proof Type Marking Explosion-proof Type Marking Flameproof Type EXd Sand Filled Type EXq Increased Safety Type EXe Pouring Type EXm Intrinsically Safe Type EXiaEXibn Type EXn Positive Pressure type EXp dust explosion-proof type DIPADIPB oil-immersed type EXo special type EXs equipment category Explosive gas environment electrical equipment is divided into: Class I: electrical equipment used in underground coal mines Class II: electrical equipment used in explosive gas environments other than coal mines Class II isolation Explosive type d and intrinsically safe type i electrical equipment is divided into IIA, IIB, and IIC flammable dust environment electrical equipment is divided into: A type dust-tight equipment; B type dust-tight equipment A type dust-proof equipment; B type anti-dust equipment Dust equipment Class I Class II Class II explosion-proof type'd' and intrinsically safe electrical equipment are divided into IIA, IIB, and IIC types of electrical equipment used in underground coal mines. Electrical equipment used in explosive gas environments except coal mines. Gas group Explosive The explosive transmission capability of a gas mixture indicates the degree of explosion risk. The greater the explosive transmission capability of an explosive mixture, the higher its risk. The explosive transmission capacity of explosive mixtures can be expressed by the maximum test safety clearance. At the same time, the degree to which explosive gas, liquid vapor, and mist are ignited also marks the degree of explosion risk, which is expressed by the minimum ignition current ratio. Class II flameproof electrical equipment or intrinsically safe electrical equipment is further divided into IIA, IIB and IIC according to the maximum test safety gap or minimum ignition current ratio applicable to explosive gas mixtures. Group representative gas maximum test safety gap minimum ignition current than IIC acetylene hydrogen less than 0.5mm less than 0.45 IIB ethylene 0.5～0.9mm 0.45～0.8 IIA propane greater than 0.9mm greater than 0.8 temperature group explosive gas mixture ignition temperature is sufficient The temperature limit for ignition. Electrical equipment is divided into T1-T6 groups according to its highest surface temperature, so that the highest surface of electrical equipment in the corresponding T1-T6 group cannot exceed the allowable value of the corresponding temperature group. The relationship between the temperature group, the surface temperature of the equipment and the ignition temperature of the flammable gas or vapor is shown in the table. Temperature class IEC/EN/GB 3836 The maximum surface temperature of the equipment T (degrees Celsius) The ignition temperature of combustible substances (degrees Celsius) T1450T Greater than 450T2300T, greater than 300, less than or equal to 450T3200T, greater than 200, less than or equal to 300T4135T, greater than 135, less than or equal to 200T5100T, greater than 100, less than or equal to 135T685T, greater than 8 and less than or equal to 100. Taking into account the possible chemical corrosion, it is still clear and durable. For example, the mark Ex, explosion-proof type, category, temperature group can be marked on the obvious place of the shell with embossed or concave patterns. The material of the sign plate should be made of chemical-resistant materials, such as copper, brass or stainless steel.
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