Most of the National Electrical Manufacturers Association’s thirteen types of enclosures can be roughly divided into three groups: general-purpose, specialized, and for use in hazardous conditions.
The list begins with general-purpose enclosures, like the NEMA type 1, which protects against dust, light, and indirect splashing. Then it introduces us to enclosures with specialized designs that protect against specific dangers (windblown dust, ice, corrosion, etc.). Finally, we meet enclosures suited to hazard-filled environments, like NEMA type 7, 8, and 9. And finally, with NEMA types 11, 12, and 13, we dip back into general-purpose products. Today we’re exploring the protections offered by the NEMA type 11 enclosure.