NEMA and IP
There are two major electrical manufacturing organisations monitoring product enclosures and/or their degree of
protection; each organization also publishes technical manufacturing standards. The National Electrical Manufacturers
Association (NEMA) Standard No. 250 – 2003 addresses non-hazardous locations, enclosure design and
its environmental performance requirements. These are referred to as NEMA Types. (www.nema.org)
The International Electro technical Commission (IEC) 60529 Standard addresses Ingress Protection (IP); this
describes the degree of enclosure protection provided, not the enclosure itself. The first digit of the IP Code designation
describes the degree of protection against the ingress of solids; the second digit designates the degree
of protection against the ingress of liquids. IP Codes support NEMA Type designations. (www.iec.ch)
Digital Systems Engineering designs mobile computers and sealed monitors to exceed Standard Sections NEMA
6P and IP68; these units incorporate a range of environmentally-sealed connectors and enclosures engineered to
provide a safe and secure dust and waterproof environment in harsh rugged conditions, meeting NEMA 6P and
IP68 summarized as: protection against objects (dust-tight) and ingress penetration against liquids at occasional
submersion, at up to depths of 10 m (33 ft).
The following information is taken from both electrical industry Standards; it matches NEMA Ratings with its IP
counterpart, with a brief description of each rating.
| 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 | 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, fibres 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, fibres 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, fibres 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, fibres 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 |
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