The explosion-proof structure type of explosion-proof LED light fixtures should be determined according to the regional level and scope of the explosive gas environment. For example, explosion-proof lamps must be used in zone 1; fixed lamps in zone 2 can be explosion-proof and increased safety; mobile lamps must be explosion-proof.
The level or group of the selected explosion-proof lamps should not be lower than the level and group of the explosive mixture in the explosion-hazardous environment. At the same time, the influence of the environment on explosion-proof lamps should be considered, and the requirements of various environments such as ambient temperature, air humidity, corrosive or polluting substances should be met.
The protection level and anti-corrosion level of lamps and lanterns should be selected according to different environmental requirements. Especially in the presence of corrosive gases in explosive gas environments, it is crucial to choose lamps with corresponding anti-corrosion properties.
In the past, in petrochemical enterprises, explosion-proof lighting was mainly used in explosion-hazardous places. With the wide application of increased-safety electrical equipment in Zone 2 explosion hazard areas, increased-safety and composite lighting fixtures are also being used more and more. On the basis of certain explosion-proof performance, the increased safety lamps have the advantages of light weight, low price, convenient installation and maintenance, and long service life compared with explosion-proof lamps.
The most common composite electrical equipment used in petrochemical enterprises is increased safety-explosion-proof composite explosion-proof electrical equipment, which generally consists of three parts: flameproof components, increased safety terminals and increased safety enclosures. performance, but also has the advantages of increased safety.
In order to prevent dust, solid foreign objects and water from entering the lamp cavity, touching or accumulating on live parts and causing dangers such as flashover, short circuit or damage to electrical insulation, there are various enclosure protection methods to protect electrical insulation.
Use the characteristic letter "IP" followed by two numbers to characterize its enclosure protection level. The first number indicates the protection against people, solid foreign objects or dust, divided into 0-6 grades. Explosion-proof lamps are sealed lamps with a dust-proof capability of at least level 4. The second number indicates the protection capability against water, which is divided into levels 0-8.
1. Explosion-proof mark EX - indicates that the equipment is explosion-proof electrical equipment;
2. Explosion-proof structure form—indicates which measures the equipment adopts for explosion-proof, such as d is explosion-proof type, p is positive pressure type; i is intrinsically safe type, etc.;
3. Category of explosion-proof equipment - divided into two categories, I is the electrical equipment used in coal mines, and II is the electrical equipment used in factories;
4. Explosion-proof level - divided into three levels: A, B, and C, indicating the strength of its explosion-proof ability;
5. Temperature group - divided into six groups T1~T6, indicating the maximum allowable surface temperature of the equipment.