Previously, in petrochemical enterprises, explosion-proof lighting fixtures for explosive hazardous areas mainly used explosion-proof types. With the widespread application of increased safety electrical equipment in explosive hazardous areas in Zone 2, increased safety and composite explosion-proof lighting fixtures are also increasingly being used. On the basis of having certain explosion-proof performance, increased safety explosion-proof lamps have advantages such as light weight, low price, convenient installation and maintenance, and long service life compared to explosion-proof lamps. The most commonly used composite electrical equipment in petrochemical enterprises is the increased safety and explosion proof composite explosion-proof electrical equipment, which is generally composed of three parts: explosion-proof components, increased safety terminal blocks, and increased safety enclosures. It has both the safety performance of the explosion-proof type and the advantages of the increased safety type.