This document specifies the general requirements for inspection and maintenance of electrical installations in hazardous locations and additional requirements for installations of different explosion-proof types. The provisions of this document are applicable to users, and the content it contains is related to the inspection and maintenance of electrical installations used in hazardous locations. The hazards of this hazardous location may be caused by caused. This document does not include: --- other basic installation and inspection requirements for electrical installations; --- verification of electrical equipment; --- repair and restoration of explosion-proof equipment (see GB/T3836.13). This document is a supplement to the requirements of GB/T16895.23.