What is explosion proof equipment? How to distinguish explosion proof equipment from ordinary equipm

Explosion-proof equipment is marked in English"ex"Sign.

Explosion-proof equipment: equipment that can be used in a gas or dust environment, and does not produce electrical sparks during use, or the energy of electrical sparks is less than the ignition energy and will not cause combustion.

1. The following conditions must exist at the same time when it is produced in a gas environment:

1. The presence of flammable gas, flammable liquid vapor or mist, the concentration of which is within the limit;

2. There is a spark, arc or high temperature sufficient to ignite the ** gas mixture.

2. Explosion-proof equipment mainly includes various explosion-proof electrical equipment

1. Explosion-proof structure of rotating motor;

2. Explosion-proof structure of low-voltage transformer;

3. Explosion-proof structure of low-voltage switch and controller;

4. Explosion-proof structure of lamps and lanterns;

5. Explosion-proof structure of electrical equipment such as signal alarm device.

Explosion-proof motor model.

d Positive pressure type.

p Increased safety type.

e Flameproof type.

d Positive pressure type.

p Increased safety type.

e Non-sparking type.

Explosion-proof transformer type.

d Positive pressure type.

p Increased safety type.

e Flameproof type.

d Positive pressure type.

p Increased safety type.

e Oil-filled type.

Explosion-proof low-voltage switch and controller models.

IA Intrinsically Safe.

IA, IB Flameproof Type.

d Positive pressure type.

p Oil-filled.

o Increased safety type.

e Intrinsically safe.

IA, IB Flameproof Type.

d Positive pressure type.

p Oil-filled.

o Increased safety type.

Explosion-proof luminaire model.

d Increased safety type.

e Flameproof type.

d Increased safety type.

Explosion-proof signal, alarm device model.

IA Intrinsically Safe.

IA, IB Flameproof Type.

d Positive pressure type.

p Increased safety type.

e Intrinsically safe.

IA, IB Flameproof Type.

d Positive pressure type.

p Increased safety type.

3. Explosion-proof equipment can also include equipment without impact sparks, such as the use of copper tools instead of iron tools (used in fireworks factories).

1. Class I electrical equipment.

Standby coal mine underground electrical equipment.

2. Class II electrical equipment is used for all other electrical equipment in the gas environment except coal mines and underground.

3. The classification of Class II equipment is based on the maximum test clearance (flameproof type) or the minimum ignition current (intrinsically safe type).

4. Class II electrical equipment can be further classified according to the type of environment it intends to use: Class IIA represents the gas is propane, Class IIB represents the gas is ethylene, and Class IIC represents the gas is hydrogen.

5. Class III electrical equipment: Electrical equipment in the most dusty environment except for coal mines. Class IIIA flammable fly dust, Class IIIB non-conductive dust, Class IIIC conductive dust.

Class I electrical equipment is used in coal mine gas gas environments (including ignition of pulverized coal);

Class II electrical equipment is used in other high-quality gas environments except coal mine gas;

Class II electrical equipment can be further classified according to the type of sexual environment in which it is intended to be used:

Class IIA, which represents that the gas is propane;

IIB class, which represents that the gas is ethylene;

IIC, which means that the gas is hydrogen.

The above Class II equipment is classified according to the maximum test clearance (flameproof type) or the minimum ignition current (intrinsically safe type).

Class III electrical equipment is used in the worst dust environment except for coal mines, and can be classified as follows, just like Class II:

Class IIIA, flammable fly flocculent;

Class IIIB, non-conductive dust;

Class IIIC, conductive dust.

Class I refers to explosion-proof electrical equipment used below the mine;

Class II refers to explosion-proof electrical equipment used in factories (not mines);

Class II is further divided into A, B, and C according to the gas category

Category III refers to explosion-proof electrical equipment used in dust environments.

From - Nanyang Hongyi Electric.

Hello, the national standard for the area where explosion-proof tools are used is **Electrical equipment for sexual environments Part 1: General requirements. The standard stipulates the classification, matching group number, structural requirements, performance requirements, test methods, inspection rules and signs, names and instructions for explosion-proof electrical equipment.

In addition, there are some relevant standards according to the different industries and places of the defense team, such as explosion-proof electrical equipment for the petrochemical industry or chain petrochemical industry Part 1: General requirements, etc. Explosion-proof tools refer to tools used in flammable and explosive and other dangerous places, which are characterized by explosion-proof performance and can effectively avoid fire caused by static electricity, sparks and other factors.

Explosion-proof tools are used in a wide range of industries, including petrochemical, coal, fertilizer, printing and dyeing, pharmaceutical, food and other industries. In these places, the use of explosion-proof tools is essential. In short, the use of explosion-proof tools should follow the provisions of national standards and industry standards to ensure safe and reliable use.

In terms of types, there are almost ordinary electrical, there are explosion-proof electrical, such as: explosion-proof motors, explosion-proof lights, explosion-proof air conditioners, explosion-proof electrical control boxes, explosion-proof fans, explosion-proof instruments and meters, etc.;

In terms of explosion-proof type: explosion-proof signs: flameproof type EXD, increased safety type EXE, intrinsically safe type ExiaEXIB, sand-filled type EX Q, pouring type EX M, positive pressure type EXP, N type EXN, special type EXS, oil-immersed type EXO, dust explosion-proof type EXTD, explosion-proof sign equipment category **Electrical equipment for gas environment is divided into:

Class I: Electrical equipment used in underground coal mines; Class II: Electrical equipment for gas environments other than coal mines.

Class II flameproof type "D" and intrinsically safe type "I" electrical equipment are further divided into Class IIA, IIB, and IIC. Electrical equipment for combustible dust environments is divided into: Type A dust-tight equipment; Type B Dust-tight Equipment; A-type dustproof equipment; Type B dust-proof equipment.

3. The explosion transmission capacity of the gas mixture of the explosion-proof marking gas group indicates the degree of danger, and the greater the explosion transmission capacity of the gas mixture, the higher the danger. **The detonation capacity of the mixture can be expressed in terms of the maximum test safety clearance. At the same time, the ease with which gases, liquid vapors, and mists are ignited also indicates the degree of danger, 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 clearance or minimum ignition current ratio applicable to ** gas mixtures.

From Nanyang Zhongtian explosion-proof.

Answer: The types of anti-riot equipment are: anti-riot square shield, anti-riot round shield, anti-riot electric shield, anti-riot helmet, anti-riot clothing, protective gloves, safety shoes, fire extinguisher, light anti-riot suit, arm protection group, body protective clothing, and foot defense group.

1. Anti-riot shield.

It is a defensive equipment that the riot police need to carry to resist foreign objects, people pushing and shoving, etc.

2. Anti-riot round shield.

It is a light defensive shield, which is carried by riot control personnel, mainly to facilitate the arrest of criminals.

3. Anti-riot electric shield.

It is also a light defensive shield, with an offensive nature, and the shield has an iron bar as a conductor on it, and when it touches it, it feels painful, and the power comes from the battery.

4. Anti-riot helmet.

The helmets worn by riot control personnel are different from ordinary helmets, and in order to prevent attacks, there is a two-stage opening method.

5. Safety shoes town.

Most of the shoes worn by the rioters are made of military large-scalp shoes.

6. The fire extinguisher is the equipment that immediately extinguishes the fire when the fire alarm is triggered.

7. The light riot suit is different from the heavy riot equipment, this design is better for activities, and the disadvantage is that there are many gaps.

Marking of gas-explosion-proof electrical equipment.

The mark of gas explosion-proof electrical equipment is EX + explosion-proof type + equipment category + (gas group) + temperature group. EX—Explosion-proof public mark.

Example 1: Class II flameproof type, Class B T3 group electrical equipment, marked ExdiibT3

Example 2: Class II increased safety type, Class B T2 group electrical equipment, marked as EXEIBT2

For more than one composite type of electrical equipment, the main explosion-proof type should be marked first, and then other explosion-proof types, such as Class II main body increased safety type and flameproof type C-class T4 group components of electrical equipment, marked as EXEDIICT4

Signs for dust explosion-proof electrical equipment.

The classification of dust explosion-proof electrical equipment is divided into 22 levels according to the dustproof level of its shell. The logo is DIP + Equipment Category + Area + Maximum Temperature, and in its appearance, DIP means "anti-dust ignition".

Such as DIP A22, T3 logo. where "A" denotes type A electrical equipment; 22 indicates the area where the equipment can be used; t3 indicates the applicable temperature group or the highest surface temperature ta, or both;

Another example is the DIP A21 TA170 or DIP A21TA T3 mark, wherein, "A21" indicates that it can be used for Type A equipment in Hejian 21 area; The maximum surface temperature ta is 170 or t3 groups.

Another example is the DIP B21 TB200 or DIP B21TB T3 mark, where "B21" indicates that it can be used for Zone 21 Type B equipment, and the maximum surface temperature Tb is 200 or T3 groups.