NEMA评级和IP有什么关系

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我们都熟知IP评级，但是你知道NEMA评级吗？
NEMA评级多用于附件。
NEMA 1 General Purpose - Indoors
Type 1 enclosures are intended for general purpose indoor use primarily to provide a degree of protection against contact with the enclosed equipment or locations where unusual service conditions do not exist.
类型1外壳通常用于室内使用，主要提供一定程度的防止与封闭设备或不存在异常使用条件的位置的接触。
NEMA 2 Drip Proof - Indoors
Type 2 enclosures are intended for general purpose indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.
类型2外壳用于室内使用的一般用途，主要用于提供一定程度的防止有限量的下落的水和污垢。
NEMA 3 Dust Tight, Rain Tight, & Ice/Sleet resistant - Indoors/Outdoors
Type 3 enclosures are intended for general purpose outdoor use primarily to provide a degree of protection against windblown dust, rain, and sleet; and to be undamaged by the formation of ice on the enclosure.
类型3外壳用于通常用于户外使用，主要提供一定程度的防止风吹灰尘，雨水和雨夹雪; 并且通过在外壳上形成冰而不受损坏。
NEMA 3R Rain Proof & Ice/Sleet Proof - Indoors/Outdoors
Type 3R enclosures are intended for general purpose outdoor use primarily to provide a degree of protection against falling rain; and to be undamaged by the formation of ice on the enclosure.
3R型外壳适用于通用户外使用，主要提供一定程度的防雨保护; 并且通过在外壳上形成冰而不受损坏。
NEMA 3S Dust Tight, Rain Tight, & Ice/Sleet Proof - Outdoors
Type 3S enclosures are intended for general purpose outdoor use primarily to provide a degree of protection against sleet; and to be undamaged by the formation of ice on the enclosure.
3S型外壳用于通用户外使用，主要用于提供一定程度的防雨雪保护; 并且通过在外壳上形成冰而不受损坏。
NEMA 4 Water Tight & Dust Tight - Indoors/Outdoors Type 4 enclosures are intended for general purpose indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, and hose directed water; and to be undamaged by the formation of ice on the enclosure.
4类外壳用于室内或室外使用的一般用途，主要用于提供一定程度的防止风吹灰尘和雨水，飞溅水和软管引导水; 并且通过在外壳上形成冰而不受损坏。
NEMA 4x Water Tight, Dust Tight, & Corrosion Resistant - Indoors/Outdoors
Type 4X enclosures are intended for general purpose indoor and outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, and hose-directed water; and to be undamaged by the formation of ice on the enclosure.
4X型箱体用于室内和室外使用，主要用于提供一定程度的防腐蚀，吹风灰尘和雨水，飞溅水和软管导向的水; 并且通过在外壳上形成冰而不受损坏。
NEMA 5 Superseded by NEMA 12 for Control Apparatus
Type 5 see NEMA 12
参见NEMA 12
NEMA 6 Submersible, Water Tight, Dust Tight, & Ice/Sleet Resistant - Indoors/Outdoors
Type 6 enclosures are intended for general purpose indoor or outdoor use primarily to provide a degree of protection against the entry of water during temporary submersion at a limited depth; and to be undamaged by the formation of ice on the enclosure.
6型外壳用于室内或室外使用的一般目的，主要是为了在有限深度的临时浸没期间提供一定程度的防止水进入的保护; 并且通过在外壳上形成冰而不受损坏。
NEMA 7 Underwriters Lab Class 1-Groups C&D -Explosion Proof - Indoors
Type 7 enclosures are for indoor use in locations classified as Class I, Groups A, B, C, or D, as defined in the National Electrical Code.
Type 7 enclosures shall be capable of withstanding the pressures resulting from an internal explosion of specified gases, and contain such an explosion sufficiently that an explosive gas-air mixture existing in the atmosphere surrounding the enclosure will not be ignited.
Enclosed heat generating devices shall not cause external surfaces to reach temperatures capable of igniting explosive gas-air mixtures in the surrounding atmosphere.
Enclosures shall meet explosion, hydro-static, and temperature design tests.
类型7外壳用于在国家电气规范中定义的分类为I类，A，B，C或D组的室内使用。
7型外壳应能承受特定气体内部爆炸所产生的压力，并且包含足够的爆炸，以使存在于外壳周围大气中的爆炸性气体-空气混合物不会被点燃。
封闭式发热装置不应使外表面达到能够点燃周围大气中的爆炸性气体-空气混合物的温度。
外壳应满足爆炸，静水压和温度设计试验。
NEMA 8 Underwriters Lab Class 1-Groups C&D -Explosion Proof - Indoors
Type 8 is same as NEMA 7, except the unit is oil-immersed.
类型8与NEMA 7相同，只是单元是浸油的。
NEMA 9 Underwriters' Lab Class II - Groups E,F,G - Indoors
Type 9 enclosures are intended for special purpose indoor use in locations classified as hazardous (Class II, Groups E, F, or G, as defined in the National Electrical Code).
Type 9 enclosures shall be capable of preventing the entrance of dust. Enclosed heat generating devices shall not cause external surfaces to reach temperatures capable of igniting or discoloring dust on the enclosure or igniting dust-air mixtures in the surrounding atmosphere.
Enclosures shall meet dust penetration and temperature design tests, and aging of gaskets (if used).
9型外壳用于在危险场所（II级，E，F或G组，国家电气规范中定义）的室内特殊用途。
9型外壳应能防止灰尘进入。 封闭式发热装置不应使外表面达到能够点燃或褪色外壳上的灰尘或点燃周围大气中的灰尘-空气混合物的温度。
外壳应满足灰尘渗透和温度设计试验，以及垫圈（如果使用）的老化。
NEMA 10 Bureau of Mines
NEMA 11 Corrosion Resistant & Drip Proof - Oil Immersed - indoors
NEMA 12 Industrial Use - Dust Tight & Drip Tight - Indoors
Type 12 enclosures are intended for industrial indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping noncorrosive liquids.
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。
NEMA 13 Oil Tight & Dust Tight - Indoors
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.
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。

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NEMA和IP外壳等级比较（比较仅为近似的）

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