There is a clear permanent embossed mark "EX" on the obvious part of the casing of electrical equipment, which means explosion-proof. The "EX" mark is an explosion-proof public mark, indicating that the equipment is explosion-proof electrical equipment.
Based on the explosion-proof measures taken, the International Electrotechnical Commission classifies explosion-proof electrical equipment into explosion-proof type, increased safety type, intrinsically safe type, positive pressure type, oil-immersed type, sand-filled type, cast-sealed type, n type, special type, dust explosion-proof type, etc. Their logos are as follows:
1. Flameproof type: Exd
2. Sand-filled type: Exq
3. Increased safety type: Exe
p>4. Sealing type: Exm
5. Positive pressure type: Exp
6. n type: Exn
7. Intrinsically safe Type: Exi
8. Dust explosion-proof type: DIP?
9. Speciality: Exs
Extended information:
For certain The possibility of explosion risk in the situation. The classification of hazardous areas classified by the International Electrotechnical Commission is as follows:
1. Zone 0: Explosive gas exists all the time or for a long time; the risk exists continuously for more than 1000 hours/ Areas every year;
2. Area 1: Areas where flammable gas may occur or exist during the normal operation of the instrument; areas where the hazard exists intermittently for 10 to 1,000 hours/year;
Zone 3. 2: Under normal circumstances, flammable gas does not exist and even if it occurs occasionally, its existence time is very short; the danger existing in an accident state is 0.1~10 hours/year.
In industrial processes, flammable and explosive situations are usually dealt with from the following three aspects:
1. Prevent or minimize the possibility of leakage of flammable substances Safety;
2. Do not use or use as little electrical components that are prone to sparks as possible;
3. Use methods such as nitrogen filling to maintain the inert state.
Baidu Encyclopedia—Explosion-proof Mark
Baidu Encyclopedia—Explosion-proof Level