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Explosion-proof electrical equipment handouts

Author: source: Datetime: 2018-11-07 14:37:45
Explosion-proof electrical equipment handouts
What is explosion-proof electrical equipment?

Electrical components, instruments, devices, etc. designed using the explosion-proof principle in an explosive atmosphere, control and regulate electrical equipment or power supply lines, to ensure that the electrical equipment in the normal operation of the power supply line is called explosion-proof electrical equipment. Electrical or electrical equipment for environmental applications such as coal, petroleum, offshore oil, petrochemical, and chemical industries.


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The components that make up the explosion-proof electrical equipment are called explosion-proof electrical appliances.

1. Classification of explosion-proof electrical equipment

Explosion-proof electrical equipment is divided into three categories: Class I, Class II, and Class III.

In addition to the above three types of explosion-proof electrical equipment, there are also electrical equipment for specific explosive environments: such electrical equipment can be tested in a certain explosive environment, the relevant information should be recorded in the explosion-proof certificate, and the corresponding signs should be marked on the electrical equipment. .

   Class I: Explosion-proof electrical equipment for coal mine gas environment, called Class I explosion-proof electrical (mine explosion-proof electrical equipment);

   Class II: Other gaseous environments other than coal mine gas (non-mineral), referred to as Class II explosion-proof electrical;

   Class III: Electrical equipment for explosive dust environments other than coal mines

2. Class II explosion-proof electrical equipment is further divided into: IIA, IIB, IIC.

   Class IIA: The representative gas used in the environment is propane;

   Class IIB: The representative gas used in the environment is ethylene;

   Class IIC: The representative gas used in the environment is hydrogen;

   Note: IIC products can be used for IIB and IIB products for IIA products; Class IIA, IIB and IIC explosion-proof electrical categories are shown in Table 1.

3. Class III electrical equipment is divided into: Class IIIA, Class IIIB, Class IIIC.

   Class IIIA: flammable fly ash;

   Class IIIB: non-conductive dust;

   Class IIIC: Conductive dust.

4. Commonly used explosion-proof electrical appliances

   a. Explosion-proof distribution box, control box, cabinet

   b. Explosion-proof starter

   c. Explosion-proof control switch

   d. Explosion-proof main electric appliance

   e. Explosion-proof junction box

   f. Explosion-proof lamps

   g. Explosion-proof connector

   h. Explosion-proof fan

   i. Explosion-proof electric heater

   j. Explosion-proof electromagnet

   K. Explosion-proof alarm

   L. Explosion-proof other types

   M. Civil explosion-proof
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