When water or dust enters electrical and electronic equipment, the equipment is prone to damage or failure. IEC classifies the ability of the enclosure to resist the ingress of dust or liquid. This rating is widely used throughout the industry.
IEC 60529 also assesses the ease of personal access to potentially hazardous parts within the enclosure. This standard, prepared by IEC Technical Committee 70, uses IP codes to evaluate the degree of protection provided by enclosures of electrical equipment with a rated voltage not exceeding 72.5 kV. The standard also defines the tests to be performed to verify that the enclosure meets these requirements.
The IP code consists of two numbers:
The first number is the degree of protection against solid objects, ranging from 0 (no protection) to 6 (no dust entry).

Ezitown supply metal enclosure compliant IP66 and Nema4x protection level.under testing report issued by UL.

The second number rates the liquid protection of the enclosure and uses a scale from 0 (unprotected) to 9 (high pressure hot water at different angles).

NEMA（美国国家电气制造业协会）等级和IP对应等级表

6 = 全方位防强喷水 – 进入极为有限。

NEMA等级 IP对应等级 NEMA定义 固体防护  液体防护
1 IP10 为室内使用设计的外壳，可在一定程度上防止人员意外接触封闭设备，并在一定程度上防止污物落入外壳内 1 = 防止直径为50mm或以上的固体异物 0 = 无防护
2 IP11 为室内使用设计的外壳，可在一定程度上防止人员意外接触封闭设备，在一定程度上防止污物落入外壳内，并可在一定程度上防止滴落和轻微飞溅的液体 1 = 防止直径为50mm或以上的固体异物 1 = 防止垂直落下的水滴
3 IP54 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；可在一定程度上防污物、雨水、雨夹雪、雪和扬尘；外壳外部结冰不会对其造成损害 5 = 防灰尘 – 一定程度上防止灰尘进入（侵入灰尘量不会影响产品正常运作 4 = 全方位防溅水 – 进入极为有限
3R IP14 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；可在一定程度上防污物、雨水、雨夹雪和雪；外壳外部结冰不会对其造成损害 1 = 防止垂直落下的水滴 4 = 全方位防溅水 – 进入极为有限。
3S IP54 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；可在一定程度上防污物、雨水、雨夹雪、雪和扬尘；并且在积冰时外部机制运转正常。 5 = 防灰尘 – 一定程度上防止灰尘进入（侵入灰尘量不会影响产品正常运作） 4 = 全方位防溅水 – 进入极为有限。
4 IP66 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；可在一定程度上防污物、雨水、雨夹雪、雪、扬尘、溅水和软管导入的水；外壳外部结冰不会对其造成损害 6 = 完全防尘
4X IP66 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；可在一定程度上防污物、雨水、雨夹雪、雪、扬尘、溅水、软管导入的水和腐蚀；外壳外部结冰不会对其造成损害 6 = 完全防尘 6 = 全方位防强喷水 – 进入极为有限。
5 IP52 为室内使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；在一定程度上防止污物落入外壳内；防沉积的空气粉尘、棉绒、纤维和飞行物；并可在一定程度上防止滴落和轻微飞溅的液体 5 = 防灰尘 – 一定程度上防止灰尘进入（侵入灰尘量不会影响产品正常运作） 2 =倾斜15°时仍可防止直接喷水侵入。
6 IP67 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；在一定程度上防止污物落入外壳内；偶然短暂浸没在有限水深时，防止软管导入的水和进水；外壳外部结冰不会对其造成损害。 6 = 完全防尘 7 = 在15cm至1m水深中短暂浸泡无影响。
6P IP67 为室内或室外使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；在一定程度上防止污物落入外壳内；长时间浸没在有限水深时，防止软管导入的水和进水；外壳外部结冰不会对其造成损害。 6 = 完全防尘 7 = 在15cm至1m水深中短暂浸泡无影响。
12和12K
IP52 为室内使用设计的外壳（无进线口），可在一定程度上防止人员意外接触封闭设备；在一定程度上防止污物落入外壳内；防流动粉尘、棉绒、纤维和飞行物；并可防止滴落和轻微飞溅的液体 5 = 防灰尘 – 一定程度上防止灰尘进入（侵入灰尘量不会影响产品正常运作） 2 = 倾斜15°时仍可防止直接喷水侵入。
13 IP54 为室内使用设计的外壳，可在一定程度上防止人员意外接触封闭设备；在一定程度上防止污物落入外壳内；防流动粉尘、棉绒、纤维和飞行物；防水、油和非腐蚀性冷却剂的喷洒、飞溅和渗漏。 5 = 防灰尘 – 一定程度上防止灰尘进入（侵入灰尘量不会影响产品正常运作） 4 = 全方位防溅水 – 进入极为有限。

 

 

 

NEMA Rating IP Equivalent NEMA Definition IP Against Objects IP Against Liquids
1 IP10 Enclosures constructed for indoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling dirt 1 = Protected against solid foreign objects of 5 cm (2 in) diameter and greater 0 = Not protected
2 IP11 Enclosures constructed for indoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, and to provide a degree of protection against dripping and light splashing of liquids 1 = Protected against solid foreign objects of 5 cm (2 in) diameter and greater 1 = Protected against vertically falling water drops
3 IP54 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow and windblown dust; and that will be undamaged by external formation of ice on the enclosure 5 = Protected against dust; limited to ingress (no harmful deposit) 4 = Protected against water sprayed from all directions; limited to ingress permitted
3R IP14 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet and snow; and that will be undamaged by external formation of ice on the enclosure 1 = Protected against solid foreign objects of 5 cm (2 in) diameter and greater 4 = Protected against water sprayed from all directions; limited to ingress permitted
3S IP54 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow and windblown dust; and in which the external mechanism(s) remain operable when ice laden 5 = Protected against dust; limited to ingress (no harmful deposit) 4 = Protected against water sprayed from all directions; limited to ingress permitted
4 IP56 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water and hose-directed water; and that will be undamaged by external formation of ice on the enclosure 5 = Protected against dust; limited to ingress (no harmful deposit) 6 = Protected against strong jets of water from all directions; limited to ingress permitted
4X IP56 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water and hose-directed water, and corrosion; and that will be undamaged by external formation of ice on the enclosure 5 = Protected against dust; limited to ingress (no harmful deposit) 6 = Protected against strong jets of water from all directions; limited to ingress permitted
5 IP52 Enclosures constructed for indoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against settling airborne dust, lint, fibers and flyings: and to provide a degree of protection against dripping and light splashing of liquids 5 = Protected against dust; limited to ingress (no harmful deposit) 2 = Protected against direct sprays of water up to 15° from the vertical
6 IP67 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against hose-directed water and the entry of water during occasional temporary submersion at a limited depth; and that will be undamaged by external formation of ice on the enclosure 6 = Totally protected against entry of dust 7 = Protected against effects of submersion from 15 cm (6 in) to 1 m (3 ft)
6P IP68 Enclosures constructed for indoor or outdoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against hose-directed water and the entry of water during occasional prolonged submersion at a limited depth; and that will be undamaged by external formation of ice on the enclosure 6 = Totally protected against entry of dust 8 = Protected against the effects of occasional submersion in water, up to 10 m (33 ft)
12 IP52 Enclosures constructed (without knockouts) for indoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers and flyings: and to provide a degree of protection to against dripping and light splashing of liquids 5 = Protected against dust; limited to ingress (no harmful deposit) 2 = Protected against direct sprays of water up to 15° from the vertical
12K IP52 Enclosures constructed with knockout(s) for indoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers and flyings: and to provide a degree of protection to against dripping and light splashing of liquids 5 = Protected against dust; limited to ingress (no harmful deposit) 2 = Protected against direct sprays of water up to 15° from the vertical
13 IP54 Enclosures constructed for indoor use; to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers and flyings: and against the spraying, splashing and seepage of water, oil and non-corrosive coolants. 5 = Protected against dust; limited to ingress (no harmful deposit) 4 = Protected against water sprayed from all directions; limited to ingress permitted