In the past, the explosion -proof lamps of explosive dangerous places mainly used explosion -proof types in petrochemical companies. With the widespread application of Zeng'an electrical equipment in the dangerous places in the 2nd area, more and more use of Zengan and composite lighting explosion -proof lamps are increasingly used. On the basis of a certain explosion -proof performance, the Zeng'an type explosion -proof lamps have the advantages of light weight, low price, convenient installation and maintenance, and long service life. The most common composite electrical equipment in petrochemical enterprises is the Zeng'an explosion -barrier composite explosion -proof electrical equipment. Generally consisting of explosion -barrier components, Zeng'an wiring terminals and Zeng'an shells. It has existing explosion -type safety performance , And also have the advantages of enhancement type.