What is explosion proof lamp and what is the explosion-proof grade?
Definition of explosion proof signs in explosion proof lamps:The explosion-proof mark in the explosion-proof lamp is used to describe the explosion-proof grade, temperature group, explosion proof type and the mark of the applicable area for the explosion-proof lighting lamps.Explosion proof sign:Explosion-proof lighting equipment according to GB 3836 standard requirements, explosion-proof lighting explosion-proof signs include:Explosion proof type + equipment category + (gas group) + temperature group1. explosion proof typeAccording to the explosion-proof measures taken, the explosion-proof lamps can be divided into flameproof, increased security, intrinsically safe, positive pressure, oil immersed, sand filling, casting sealing type, N type, special type, dust explosion-proof type, etc.. Their identity is shown in table 1.Table 1 basic types of explosion protectionThe explosion-proof type explosion-proof type explosion-proof type explosion-proof type sign sign flameproof Ex D sand filled Ex Q safety Ex e Ex encapsulated m Ex PN type Ex positive pressure type N intrinsically safe Ex ia dust explosion-proof type DIP A intrinsically safe Ex IB dust explosion-proof type DIP B type Ex o Ex special oil s
4. temperature groupsThe ignition temperature of an explosive gas mixture is a temperature limit that can be ignited.Explosion-proof lighting equipment according to its highest surface temperature is divided into T1 ~ T6 group, so that the corresponding T1 / T6 group explosion-proof lighting equipment of the maximum surface temperature shall not exceed the allowable value of the corresponding temperature group. The relationship between the temperature range, the equipment surface temperature, and the ignition temperature of flammable gas or steam is shown in table 3.Table 3 Relationship between temperature range, equipment surface temperature and ignition temperature of flammable gas or steamTemperature range IEC/EN /GB 3836 equipment maximum surface temperature T[C] ignition temperature of flammable material [DEG]T1 450, T>450T2 300450 = T>300T3 200300 = T>200T4 135200 = T>135T5 100135 = T>100T6 85100 = T>85This answer is recommended by users
2. device classes:The luminaire used in explosive atmospheres is divided into:Class I: explosion proof lighting equipment used in underground coal mines;Class II: Flameproof lighting installations for other explosive gas atmospheres other than coal mines;II flameproof type "d" and intrinsically safe "I" explosion-proof lighting equipment are divided into IIA, IIB, and IIC categories.Flammable dust environment is divided into explosion-proof lighting equipment:A type dust tight equipment; B type dust tight equipment; A type dustproof equipment; B type dustproof equipment.3. Gas GroupThe explosion ability of explosive gas mixture indicates the degree of explosion risk, and the greater the explosion ability of explosive mixture, the higher the risk. The explosive propagation capacity of explosive mixtures can be expressed by the maximum test safety gap. At the same time, the ease of ignition of explosive gases, liquid vapors, and mists is also a sign of the degree of explosion, which is indicated by the minimum ignition current ratio. II type flameproof explosion-proof lighting equipment or safety explosion-proof lighting equipment, according to the maximum experimental safe gap which is suitable for explosive gas mixture or the minimum ignition current is further divided into IIA, IIB and IIC. As shown in table 2.Table 2 Relationship between group of explosive gas mixture and maximum test safety gap or minimum ignition current ratioGas group maximum experimental safe gap MESG (mm) than the minimum ignition current MICRIIAMESG = 0.9MICR>0.8IIB0.9>MESG>0.50.8 = MICR = 0.45IIC0.5 = MESG0.45>MICR
