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How to improve the knowledge of explosion-proof electrical equipment such as explosion-proof air conditioner-explosion-proof refrigerator-explosion-proof dehumidifier?
Edit:Ye Qi (Shanghai) Electric Co., Ltd.   UpDate:2019-11-11

Explosion-proof air conditioning - explosion-proof refrigerator - explosion-proof dehumidifier and other explosion-proof electrical equipment related knowledge learning?

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Explosion-proof electrical equipment related knowledge:

(1) Hazardous places:

According to the provisions of GB3836.14-2000 "Electrical Equipment for Explosive Gas Atmospheres Part 14: Classification of Hazardous Locations", dangerous places can be divided into Zone 0, Zone 1, Zone 2.

(a) Zone 0: A place where an explosive gas atmosphere continuously appears or exists for a long time.

(b) Zone 1: A location where an explosive atmosphere may occur during normal operation.

(c) Zone 2: In normal operation, an explosive atmosphere is unlikely to occur, and if it occurs, it is an occasional occurrence and is only a short-lived place.

2. Category: Explosion-proof air conditioning - Explosion-proof refrigerator - Explosion-proof dehumidifier

The types of electrical equipment are related to the use environment. There are two main categories: - Class I: Electrical equipment for coal mines. - Class II: Other explosive atmospheres other than coal mines. Class II explosion-proof "d" electrical equipment according to the large test safety clearance, intrinsically safe "i" electrical equipment is divided into IIA, IIB, IIC according to the small ignition current (IIB type has a wide range of use, only hydrogen, The IIC class is required for acetylene sites, see Table 3).

3. High surface temperature:

When the electrical equipment is operated under adverse conditions within the allowable range, it can cause high temperatures in any part or surface ignited by the surrounding explosive atmosphere.

4. Ignition temperature: explosion-proof air conditioning - explosion-proof refrigerator - explosion-proof dehumidifier

A mixture of a flammable gas or vapor and air at a low temperature that is ignited by a hot surface under specified conditions (see Table 1).

5. Temperature group:

A group of electrical equipment divided by its high surface temperature. Relationship between temperature group, surface temperature and ignition temperature Temperature group of electrical equipment High surface temperature of electrical equipment Ignition temperature of gas or vapor T1 450 °C>450°CT2 300°C>300°CT3 200°C>200 °CT4135°C>135°CT5 100°C>100°CT6 85°C>85°C

6. Dust explosion-proof dangerous places:

According to the frequency and duration of the explosive or flammable dust environment, the dust explosion hazard is divided into: Zone 10: During the normal processing, treatment or cleaning process, the presence or possible occurrence of dust cloud or dust layer mixed with air The area where the explosive concentration is reached. Zone 11: A site not classified as Zone 10, but under abnormal conditions, a dust cloud or a zone where the dust layer and air are mixed to reach the explosive concentration can be found in the site.

7. The relationship between the temperature group of dust, the ignition temperature, and the high surface temperature. Explosion-proof air conditioning - explosion-proof refrigerator - explosion-proof dehumidifier

Temperature group ignition temperature T high surface temperature without overload There is an approved overload T11 T>270°C215°C190°CT12<><>