NEMA 1: General purpose – intended for indoor use primarily to provide a degree of protection against contact with the enclosed parts in locations without unusual service conditions.
NEMA 2: Drip proof – intended for indoor use primarily to provide a degree of protection against limited amounts of falling water or dirt.
NEMA 3: Rain-tight, dust tight, and sleet (ice) resistant – intended for outdoor use with primarily to provide a degree of protection from windblown dust, rain, sleet, and undamaged by ice formation.
NEMA 3S: Rain-tight, dust-tight, and sleet (ice) resistant - intended for outdoor use primarily to provide a degree of protection against wind-blown dust, rain, sleet, and external mechanism remains operable when ice laden.
NEMA 3R: Rain-tight, dust-tight, and sleet (ice) resistant - intended for outdoor use primarily to provide a degree of protection against falling rain and sleet, undamaged by the formation of ice on the enclosure.
NEMA 4: Watertight and Dust tight – intended for indoor/outdoor use to provide a degree of protection against splashing water, water seepage, falling or hose directed water and sever external condensation, undamaged by the formation of ice on the enclosure.
NEMA 4X: Watertight and Dust tight, and corrosion resistant: - same as NEMA 4 with addition of corrosion resistance.
NEMA 6: Submersible – intended for indoor/outdoor use to provide a degree of protection against entry of water during submersion at a limited depth.
NEMA 6P: Submersible – same as a type 6 enclosure, but provides prolonged submersion protection at a limited depth.
NEMA 7: Explosion Proof (class I, division 1, A, B, C, D) designed to contain an internal explosion without causing an external hazard when installed in a designated atmospheres and locations. Class I, Division 1 locations are those in which hazardous atmospheres are, or may be, present under normal operating conditions.
Group A = atmospheres containing acetylene.
Group B = atmospheres containing hydrogen.
Group C = atmospheres containing ethyl-ether vapors, ethylene, or cycopropane.
Group D = atmospheres containing gasoline, hexane, naphtha, benzene, butane, propane, alcohol, acetone, benzol, lacquer, solvent vapors, and natural gas.
NEMA 9: Explosion Proof (class II, division 1, E, F, G,) – Dust-ignition-proof enclosures designed to prevent the entrance of dust and the enclosure devices do not produce sufficient heat to cause external surface temperatures capable if igniting dust on the enclosure or in the surrounding atmosphere. Class II, Division 1 locations are those in which combustible dust is, or may be, present under normal conditions.
The information contained in this article is for general information purposes only. The information is provided by
United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or
warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with
respect to the website or the information, products, services, or related graphics contained on the website for any purpose.
Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss
or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of,
or in connection with, the use of this information.