Introduction to explosion proof grades, how many grades are explosion proof grades?

Flameproof type - D refers to the electrical equipment that encloses the parts that can ignite the ** sex mixture in a shell, which can withstand the ** pressure of the internal ** sex mixture and prevent the explosion of the ** sex mixture around it (advantages: easy to over-target large products, disadvantages: high cost, heavy items, materials:

Steel, aluminum alloy ADC12, cast iron) intrinsically safe type - IA limits the spark discharge energy and heat energy of the circuit by limiting various parameters of the electrical equipment circuit or taking protective measures, so that the electric spark and thermal effects generated by it in normal operation and specified fault states cannot ignite the ** mixture of the surrounding environment, so as to achieve electrical explosion protection. (High requirements for setting, low cost for PCB) pouring type -- m will be the electrical equipment may produce the arc, spark or high temperature of the electric equipment to produce the first mixture of the arc, spark or high temperature part of the pouring...

The environment in which ** may occur. (Such as: flammable gas, dust environment, oil refining, petrochemical plants, gas stations, gas stations, etc.), ** gas environment Under atmospheric conditions, a mixture of gas, vapor or mist combustible substances and air, after ignition in the mixture, combustion will spread throughout the environment of the unburned mixture.

Such as: CH4, C2H2, C2H4, NH3, CO, C2H5OH and other explosion-proof electrical equipment).

There are three types of explosion-proof ratings:

Category: Underground electrical equipment in coal mines;

Category: All other electrical equipment for gas environment except coal mines and underground.

Class can be divided into class A, B, class C, and the equipment marked B can be applied to the use conditions of equipment A; c can be applied to the conditions of use of a and b.

Category: Electrical equipment in the most dusty environment other than coal mines.

Class A: flammable fly floc; Class B: non-conductive dust; Class C: Conductive dust.

Maximum surface temperature: The maximum temperature reached by any part of the electrical equipment that may cause ignition in the surrounding environment when the electrical equipment is operating under the most unfavorable operating conditions within the specified range. The maximum surface temperature should be lower than the flammable temperature.

Regional classification: A hazardous location area is a measure of the actual likelihood of a hazard in the area, thereby specifying the type of explosion protection to which it can be applied.

International Electrotechnical Commission (IEC) Classification of hazardous areas classified by the European Electrotechnical Commission:

Zone 0: Explosive gases are present at all times or for a long time; Continuously present an area with a hazard greater than 1000 hours per year;

Zone 1: Flammable gases may occur or exist in the proper working process of the instrument; intermittent presence of 10 1000 hours of risk per year in the area;

Zone 2: In general, flammable gases are not present and even if they occur occasionally, they are only present for a short period of time; The hazard that exists in the accident state hours of the area per year.

Note: The valid area in China is the same as the above.

Which explosion-proof rating are you asking? Explosion-proof rating of electrical equipment? What is the explosion-proof rating of the building? Or is it the explosion-proof level of basement civil air defense?

Legal analysis: The classification of explosion-proof electrical equipment is based on the category of equipment used, the temperature group of the high-quality gas mixture, and the explosion-proof type of explosion-proof electrical equipment.

Legal basis: "Current National Standards for Electrical Explosion Protection" 1, GB ** Sexual Environment Part 1: Equipment General Requirements 2, GB ** Sexual Environment Part 2:

Equipment protected by flameproof enclosure "D" 3, GB ** sexual environment Part 3: Equipment protected by increased safety type "E" 4, GB **sexual environment Part 4: Equipment protected by intrinsically safe type "I" 5, ** Electrical equipment for gaseous environments Part 5:

Positive pressure housing type "P".

Summary. 1. EXDE BT4 has one more E than EXD BT4, E represents increased safety type, EXDE BT4 is more than EXD BT4, and there is more increased safety type in the type of explosion-proof electrical products.

2. EX T6 is different from the first two in three aspects.

The explosion-proof mark is T6 (IA T6), which means: the type of explosion-proof electrical products is intrinsically safe, which is used in Class II places, and the ignition temperature of ** gas is T6 group.

The explosion-proof mark is DIIBT4, which represents: the type of explosion-proof electrical products is flameproof, which is the IIB class (class) used in Class II places, and the ignition temperature of ** gas is T4.

The explosion-proof mark is DEIIBT4, which represents: the type of explosion-proof electrical products is composite type, which is the IIB class (class) used in Class II places, and the ignition temperature of ** gas is T4.

Explosion-proof rating: EXD AT3

Group Name: Representative Gases or DustsA Acetylene B: Hydrogen Temperature Group: Safe Surface Temperature: Common ** Gases: T3 200 Gasoline, Butenin, etc. 36 Types, T4 135, Acetaldehyde, Tetrafluoroethylene, etc. 6 Kinds.

Explosion-proof grade: EXD CT6

What is the difference between the two?

Explosion-proof grade: EXD AT3 and explosion-proof grade: EXD CT6GB.

1. EXDE BT4 has one more E than EXD BT4, E represents increased safety type, EXDE BT4 is more than EXD BT4, and there is more increased safety type in the type of explosion-proof electrical products. 2. EX T6 is different from the first two in three aspects. The explosion-proof mark is T6 (IA T6), which stands for:

The type of explosion-proof electrical products is intrinsically safe, which is used in Class II places and the ignition temperature of ** gas is T6. The explosion-proof mark is DIIBT4, which represents: the type of explosion-proof electrical products is flameproof, which is the IIB class (class) used in Class II places, and the ignition temperature of ** gas is T4.

The explosion-proof mark is DEIIBT4, which represents: the type of explosion-proof electrical products is composite type, which is the IIB class (class) used in Class II places, and the ignition temperature of ** gas is T4.

Explosion-proof certificationAccording to the different states of matter existing in the place, the hazardous place is divided into ** gas environment and combustible dust environment. According to the length of existence of hazardous substances in the premises, the hazardous places under two different states of matter are divided into three zones, namely:

For ** gas atmosphere, it is Zone 0, Zone 1 and Zone 2:

Zone 0: A place where the gas environment is continuously present or exists for a long time.

Zone 1: During normal operation, there may be a ** gas environment.

Zone 2: During normal operation, there is no possibility of a ** gas atmosphere or an occasional occurrence and only a state front is a short-term occurrence.

International Electrotechnical CommissionClassification of hazardous areas classified by the European Electrotechnical Commission:

Zone 0: Explosive gases are present at all times or for a long time; Continuously present an area with a hazard greater than 1000 hours per year;

Zone 1: Flammable gases may occur or exist in the proper working hours of the instrument; intermittent presence of 10 1000 hours of risk per year in the area;

Zone 2: In general, flammable cracks are absent and even if they occur occasionally, they are short-lived; The hazard that exists in the accident state hours of the area per year.

The valid area in China is the same as above.

Explosion-proof electrical equipment:

Explosion-proof electrical equipment is divided into two categories: Class I is electrical equipment used in underground coal mines; ii refers to electrical equipment used in places other than mines, and is distinguished by the maximum test safety clearance (MESG) or the minimum ignition current (MICR).

Class II electrical equipment is further divided into three categories: IIA, IIB, and IIC. The above four categories are mainly based on the minimum spark energy that may be detonated under different working conditions, China, Europe and most countries and regions in the world.

The ** gas is divided into these four hazard classes.

The specific differences are as follows: Secondly, according to the difference in ignition temperature of the ** gas mixture, the group is divided into six types: T1, T2, T3, T4, T5, and T6, and the ignition temperature is expressed by T( ).

The classification of explosion-proof electrical equipment is divided according to the category of equipment used, the temperature group of the high-quality gas mixture, and the explosion-proof type of explosion-proof electrical equipment.