How is the explosion proof grade divided? What is the general explosion proof level of the security

First of all, explosion-proof electrical equipment is divided into two categories: Class I is electrical equipment used in coal mines; ii Electrical equipment used in places other than mines. Class II electrical equipment is further divided into three categories: etc.

Secondly, to understand the division of explosion-proof grades, we must first understand the grouping of ** gas mixtures according to the ignition temperature: the groups are respectively expressed, the ignition temperature is expressed by t( ), and the ignition temperature of the t1 group is:; 450℃＜t；t2 is:

300℃＜t≤450 ℃；t3 is: 200 t 300; t4: 135 t 200; t5 is:

100℃＜t≤135℃；t6 is: 85 t 100.

Again, it is necessary to understand the explosion-proof type of explosion-proof electrical, which is divided into: flameproof type, marked D; Increased safety type, marked as: E; Positive pressure type, marked by P; intrinsically safe type, marked by I; Also: oil-filled type. Sand filling type. pouring type, etc.

After understanding these points, it is good to understand the division of explosion-proof grades, explosion-proof electrical equipment is based on the category of equipment used; **Temperature group of the gas mixture; The explosion-proof type of explosion-proof electrical equipment is divided, for example, the explosion-proof mark is DIIBT4, which means that 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.

To choose the right explosion-proof camera, in fact, it is to choose different explosion-proof types, different explosion-proof levels and temperature groups, and different shell materials according to the different environments and conditions of the site.

Class ** mixed gas - used in chemical, oilfield, oil tank, petrochemical, oil refining, military, aerospace and other factories (gas explosion-proof): commonly used flameproof type, its explosion-proof mark is EXD A, B, C.

The highest grade of EXDIICT6 will only be used if hydrogen, acetylene, and carbon disulfide are present on siteIn addition, all environments can be selected, and the explosion-proof grade is the code used by the international community to determine the protection level.

The IP rating consists of two numbers, the first of which indicates dust resistance; The second number means waterproof, and the higher the number, the better the protection. Generally, IP65 can basically meet the requirements outdoors.

How to divide the grade of explosion-proof mobile phone? How to choose an explosion-proof mobile phone?

Take the explosion-proof mobile phone iOutdoor iOutdoor F1 (explosion-proof version) as an example, it is an EX ib IIC T5 GB industrial intrinsically safe explosion-proof handheld terminal. The following is explained from left to right:

EX: It is a mark that meets the European explosion-proof standards;

ib: It is a higher risk environment, generally refers to the equipment used in Zone 1;

IIC: refers to the "IIC" level in gas explosion-proof, and the representative gases are: hydrogen, acetylene, carbon disulfide;

T5: It is divided into 6 temperature groups according to the surface temperature of the equipment, T5 refers to the high surface temperature of the equipment can not exceed 100;

GB: is the level of protection of the device.

What I know is CT4 CT6 Our gas alarm is CT6 Security This explosion-proof requirement CT4 should be able to meet.

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".

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.

Legal analysis: According to the provisions of the relevant standards of our country, due to the fact that in the most important gas or atmospheric environment, the gas and other macros are not allowed to form a mixture with the air, which is ignited in the secondary mixture, which leads to the first gas. China's explosion-proof classification standards are:

1. Electrical equipment in coal mines; 2. The second category is the electrical equipment used to make potato stools in the environment such as removing coal mines; 3. The third category is the electrical equipment in the dust environment that removes the gaseous environment such as coal mines.

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. Category A:

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