1.Explosion-proof grade

The explosion-proof grade is used to indicate the risk level of the explosive environment that the equipment may encounter during use at its installation location. Usually, the explosion-proof grade consists of the word "Ex" and two numbers. The first number indicates the adaptability of the equipment to the environment, and the second number indicates the explosion-proof ability of the equipment.

* Ex d IIB T4: The equipment is flameproof type (d), suitable for coal mines and factories Class II B (IIB) flammable gas environment and T4 group temperature level (T4).

* Ex d IICT6: The equipment is flameproof type (d), suitable for factories Class II C (IICT) flammable gas environment and T6 group temperature level (T6).

2. Flameproof Type (d)

Flameproof explosion-proof equipment has the performance of being able to withstand the explosion of explosive mixtures entering the equipment without damaging the equipment and will not cause the combustion of external explosive mixtures.

3. Explosion Hazard area

Explosion hazard area refers to a place where explosions may occur, which is divided into different area levels according to the degree of explosion hazard.

* Class II B (IIB) in coal mines and factories: suitable for places with coal dust and flammable gases.

* Class II C (IICT) in factories: suitable for places with flammable and explosive gases.

4. Explosive Properties

Explosive properties refer to the explosion range of flammable gases or dust in the air, usually expressed as a percentage. According to the different explosion ranges, flammable gases or dust can be divided into methane (CH4), ethylene (C2H4), hydrogen (H2), acetylene (C2H2), etc.

5. Temperature Level

The temperature level refers to the maximum temperature that the surface of the equipment may reach under normal operation and failure conditions. According to different temperature levels, the equipment can be divided into groups T1~T6.

* T4: The surface temperature of the equipment is between 135~200°C, which belongs to the higher temperature level.

* T6: The surface temperature of the equipment is between 85~150°C, which belongs to the lower temperature level.

6. NEMA 250/251/252

NEMA refers to the National Electrical Manufacturers Association, which sets standards for evaluating the safety performance of electrical equipment in flammable gas or dust environments. NEMA 250/251/252 refers to the safety performance requirements for equipment operating in Zone 0, Zone 1, and Zone 2.

7. IEC 60079-0/1/2/3/4/5/6/7/8/9/10

IEC refers to the International Electrical Commission, which sets standards for evaluating the safety performance of electrical equipment. The IEC 60079 series of standards is a series of safety performance requirements specifically for electrical equipment in flammable gas or dust environments. Among them, IEC 60079-0, IEC 60079-1, IEC 60079-2, IEC 60079-3, IEC 60079-4, IEC 60079-5, IEC 60079-6, IEC 60079-7, IEC 60079-8, IEC 60079-9 and IEC 60079-10 are safety performance requirements for different application scenarios.

8. GB 3836/1/2/3/4/5/6/7/8/9/10/11/12

GB refers to the Chinese National Standard (GB), which is used to evaluate the safety performance requirements of electrical equipment in China. The GB 3836 series of standards are safety performance requirements specifically formulated for electrical equipment in flammable gas or dust environments. Among them, GB 3836.1, GB 3836.2, GB 3836.3, GB 3836.4, GB 3836.5, GB 3836.6, GB 3836.7, GB 3836.8, GB 3836.9, GB 3836.10, GB 3836.11 and GB 3836.12 are safety performance requirements for different application scenarios.