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NEMA - Model 3 -Electrical Enclosures
NEMA 3 electrical enclosures are weather-resistant and include a degree of protection from windblown dust and ingress of water in the forms of rain, sleet and snow. A NEMA 3 rated electrical enclosure will also remain undamaged from the formation of ice on the enclosure. NEMA 3 enclosures are fabricated to house electrical controls, generator skids, or rotating equipment and protect these electrical components aboard shipdocks, on constructions sites, inside tunnels or in subway systems.
Nema 3 Enclosures Applications: Indoor vs. Outdoor
For indoor applications such as industrial structures or labs the metal structure is generally stored in a dry environment but would be equipped to protect against dripping pipes.
Outdoor applications require that the metal junction box be impervious to a range of weather conditions that include rain, wind, sleet and the formation of ice.