According to the explosion -proof measures taken, explosion -proof electrical equipment can be divided into explosion -barrier, increased safety, essential safety type, positive pressure type, oil immersion, sand charging, sealing type, N -type, special type, dust -proof explosion -proof type type wait. The identity of their signs is as shown in the following table:

     Explosion electrical equipment (D): It refers to closing the parts that can ignite the explosive mixture in a shell. The shell can withstand the explosive pressure of the internal explosive mixture and prevent the electrical equipment from the surrounding explosive mixture.

Zeng'an Electric Equipment (E): Under normal operating conditions, the spark or dangerous temperature of an explosive mixture will not be generated, and measures are taken in structure to improve its safety to avoid ignition phenomenon under normal and prescribed overload conditions. Electric equipment.

Essential safety electrical equipment (i): The sparks or thermal effects generated under normal operation or under standard test conditions cannot ignite the electrical equipment of explosive mixtures.

Sparkless electrical equipment (N): Under normal operating conditions, arcs or sparks are not generated under normal operating conditions, and high -temperature surfaces or burning spots that can ignite the surrounding explosive mixture are not produced, and faults that are not ignited will not occur.

Explosion -proof special type (S): When electrical equipment or components use GB3836 that the explosion -proof type is not included, the competent authority formulates a temporary provision. Send the Ministry of Labor and Personnel for the record, and after the inspection of the specified appraisal unit, it is disposed of in special electrical equipment.