危险(分类)区域中有关电气设备的气体、蒸气和粉尘的分类危险(分类)区域中有关电气设备的气体、蒸气和粉尘的分类Classification of gases, vapors and dusts for electrical equipment in hazardous (classified) locations
易燃液体、气体或蒸气的分类及化工生产区域中电气安装危险区的划分
Classification of flammable liquids, gases, or vapors and of hazardous locations for electrical installations in chemical areas