NEMA 3R - Exact same as NEMA three excluding protection in opposition to windblown dust.

NEMA 3S - Enclosures give a degree of safety towards falling dust, rain, sleet, snow, and windblown dust and in which the external mechanism(s) continue to be operable when ice laden.

NEMA four - Safety against falling filth, rain, sleet, snow, windblown dust, splashing h2o, and hose-directed drinking water and that will be undamaged by the external formation of ice on the enclosure.

NEMA 4X - Same as NEMA 4 such as safety from corrosion.

NEMA 5 - Enclosures protection in opposition to falling dust versus settling airborne dust, lint, fibers, and flyings and to provide a degree of safety in opposition to dripping and light splashing of liquids.

NEMA six - Enclosures protection from falling dirt against hose-directed water and the entry of water for the duration of occasional momentary submersion at a confined depth and that will be undamaged by the external formation of ice on the enclosure.

NEMA 6P - Very same as NEMA six including protection against the entry of drinking water in the course of extended submersion at a constrained depth.

NEMA 7 - Enclosures are for indoor use in destinations labeled as Class I, Groups A, B, C, or D and shall be able of withstanding the pressures resulting from an internal explosion of specified gases,

NEMA 9 - Enclosed heat establishing devices shall not lead to exterior surfaces to reach temperatures capable of igniting or discoloring dust on the enclosure or igniting dust-air mixtures in the bordering atmosphere.

NEMA twelve - Enclosures protection versus falling dirt towards circulating dust, lint, fibers, and flyings and against dripping and light splashing of liquids.

NEMA 12K - Same as NEMA twelve such as enclosures produced with knockouts.

NEMA 13 - Enclosures safety versus falling dust versus circulating dust, lint, fibers, and flyings and against the spraying, splashing, and seepage of h2o, oil, and non-corrosive coolants.

Details courtesy of IEC, NEMA and CENELEC

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