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APPENDIX
Appendix B: NEMA Standard Classification Code for Enclosures
NEMA 1—General purpose. for indoor protection, where condi-
tions are not unusually severe.
NEMA 2—Drip tight. Designed to exclude falling moisture or
dirt. Particularly applicable to cooling rooms, laundries, etc.,
where condensation is prevalent. For indoor use.
NEMA 3—Weather Resistant (weatherproof). For outdoor use;
designed to withstand all normal exposure to natural elements.
Controls mounted on pullout racks for easy access. With rain
hood and weather seals.
NEMA 4—Watertight. Withstands water pressure from 1 in.
hose nozzle, 65 gallons per minute, from distance of not less
than 10 ft for five minutes. Suitable for maritime applications,
breweries, etc.
NEMA 5—Dust-tight. Equipped with dust-tight gaskets. Suitable
for mills and other high-dust atmospheres.
NEMA 6—Submersible. For submerged operation under speci-
fied pressures and time.
NEMA 7—Hazardous Locations, National Electrical Code Class
1 (circuit breaks in air).
NEMA 8—Hazardous Locations, National Electrical Code Class
1 (circuit breaks immersed in oil).
NEMA 9—Hazardous Locations, National Electrical Code Class
2.
NEMA 10—Explosion-proof. Meets U.S. Bureau of Mines
requirements for explosive atmospheres.
NEMA 11—Acid or Fume Resistant. Provides for immersion of
enclosed equipment in oil.
NEMA 12—IIndustrial Use. Excludes oils, dust, moisture, to
satisfy individual requirements.
Appendix B: NEMA Standard Classification Code for Enclosures