13型外壳适用于工业室内使用，主要提供一定程度的防尘，防水，防油和非腐蚀性冷却液的防护。
Type 13 enclosures are intended for industrial indoor use primarily to provide a degree of protection against dust, spraying of water, oil, and noncorrosive coolant.
12型外壳适用于工业室内使用，主要提供一定程度的防尘，防灰尘和非腐蚀性液体的防护。
Type 12 enclosures are intended for industrial indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping noncorrosive liquids.
自动手动转换开关板应为独立式，室内型、金属外壳装置，保护等级为IP42。
Auto transfer switch panels shall be free standing, indoor type, metal enclosed units with degree of protection IP42.
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