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There are many numerical NEMA designations; we’ll discuss NEMA enclosures relevant to this data sheet: NEMA 3, NEMA 3R, NEMA 4, NEMA 4X, and NEMA 12. NEMA 3 enclosures, designed for both indoor and outdoor use, provide protection against falling dirt, windblown dust, rain, sleet, and snow, as well as ice formation.