In fact,Explosion proof certificationIt is a necessary test for most electrical products to pass testing and obtain certification. This is not only a guarantee and promotion of product quality, but also makes customers feel more confident when using it. The country's response toExplosion proof certificationThere are also strict standards.
The concept of explosion-proof
Explosion requires certain prerequisites.
1. Explosive substances (flammable)
2. Forming an explosive mixture in a certain space, with a concentration within the explosive limit of the gas; (Adequate oxygen)
3. It is an ignition source, and its energy must be greater than the minimum ignition energy of the explosive mixture (reaching the ignition point)
An explosion can only occur when it exists simultaneously in a certain area, which is known as the explosion triangle principle. What we need to do is control one or more of these three conditions. Oxygen and explosive substances in explosive environments objectively exist, so we need to control the objects (and detonation sources) working in explosive hazardous environments, which is called explosion-proof.
The significance of explosion prevention
Explosive substances: Many production sites produce some combustible substances. About two-thirds of the underground coal mines contain explosive substances; In the chemical industry, approximately80% of the production workshop area contains explosive substances. Oxygen: Oxygen is ubiquitous in the air. Igniting sources: Electrical instruments, various frictional sparks, mechanical wear sparks, electrostatic sparks, high temperatures, etc. are widely used in the production process, especially in the event of instrument and electrical failures.
Objectively speaking, many industrial sites have met the explosion conditions. When the mixed concentration of explosives and oxygen is within the explosion limit, if there is an explosive source, an explosion will occur. Therefore, it is necessary to take explosion-proof measures.
Explosion proof level description.
IA level: Electrical equipment cannot ignite explosive gas mixtures during normal operation.
When working normally, the safety factor is2.0;
When a malfunction occurs, the safety factor is1.5;
When there is a secondary fault, the safety factor is1.0.
Note: Spark contacts must be equipped with explosion-proof enclosures. Airtight casing or double to increase safety factor.
IB level: Electrical equipment that cannot ignite explosive gas mixtures during normal operation and malfunction.
When working normally, the safety factor is2.0;
When a malfunction occurs, the safety factor is1.5. During normal operation, spark contacts must protect the explosion-proof or airtight housing and take measures to self display faults. When there is a malfunction, the safety factor is 1.0.
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