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I. What are the common explosion-proof electrical devices used in the petrochemical industry? The explosion-proof electrical equipment commonly used in the petrochemical industry is Category II industrial electrical equipment. Among them, flameproof and intrinsically safe types of explosion-proof electrical equipment are the most commonly used. Class II flameproof and intrinsically safe explosion-proof electrical equipment can be further divided into Classes IIA, IIB, and IIC depending on the properties of the explosive gases in which they are used. Based on the highest temperature of the heated surface during operation, they can be classified into six temperature grades: T1----T6. Temperature grades T1–T6 are as follows: the highest surface temperature for each grade is T1: 1450°C, T2: 3000°C, T3: 2000°C, T4: 1350°C, T5: 1000°C, and T6: 850°C. II. Requirements for the installation of explosion-proof electrical equipment in the petrochemical industry: 1. Explosion-proof electrical equipment should be installed in non-hazardous areas whenever possible; if that is not feasible, it should be installed in areas with a lower level of hazard. 2. When explosion-proof electrical equipment is installed in hazardous areas, pay attention to the hazardous gases present there to prevent external electrical sparks from causing an explosion. 3. When installing explosion-proof electrical equipment, pay attention to external conditions such as gases, humidity, and temperature; choose the appropriate model to avoid potential hazards.