NEMA 防护等级 分类
NEMA是由美国制造商们组织起来的，是制定电气设备标准化产品技术规格的一个组织机构。
NEMA所制定的标准和测试方法被应用到了UL（担保人试验室）测定、认定电气密封箱的基本方针。
括号里面是指相应的IP等级

NEMA 1: Indoor use primarily to provide a degree of protection against contact with the enclosed equipment and against a limited amount of falling dirt. (IP30)
2: Indoor use to provide a degree of protection against limited amounts of falling water and dirt. (IP31)
3: Outdoor use to provide a degree of protection against windblown dust, rain, and sleet; undamaged by the formation of ice on the enclosure. (IP64)
3R: Outdoor use to provide a degree of protection against falling rain and sleet: undamaged by the formation of ice o the enclosure. (IP32)
3S: Outdoor use to provide a degree of protection against windblown dust, rain and sleet; external mechanisms remain operable while ice laden.
4: Indoor or outdoor use to provide a degree of protection against splashing water, windblown dust and rain, hose directed water; undamaged by the formation of ice on the enclosure. (IP66)
4X: Indoor or outdoor use to provide a degree of protection against splashing water, windblown dust and rain, hose directed water; undamaged by the formation of ice on the enclosure, resists corrosion. (IP66)
6: Indoor or outdoor use to provide a degree of protection against the entry of water during temporary submersion at a limited depth; undamaged by the formation of ice on the enclosure.
6P: Indoor and outdoor use to provide a degree of protection against the entry of water during prolonged submersi at a limited depth.
11: Indoor use to provide by oil immersion a degree of protection of the enclosed equipment against the corrosive effects of corrosive liquids and gases.
12,12K: Indoor use to provide a degree of protection against dust, falling dirt and dripping noncorrosive liquids. (IP65)
13: Indoor use to provide a degree of protection against dust and spraying of water, oil and noncorrosive coolants. (IP65)

顶起来！支持楼主！