Just thought I would give everyone a list of Standards for Enclosure Ratings, so here goes:
NEMA 1- For indoor use. To previent accidental contact with enclosed equipment, in areas where unusual conditions do not exist. Protects from falling dirt.
NEMA 3R- For indoor or outdoor use. To provide protection against windblown rain, Snow, Sleet and external formation of ice.
NEMA 4- For indoor or outdoor use. To provide protection against wind-blown rain and dust, splashing or hose directed water, and external formation of ice.
NEMA 4X- Same as NEMA 4 with the addition of Corrosion Resistant.
NEMA 12- For indoor use. To provide protection against dust, falling dirt, dripping non-corrosive liquids, lint, fibers, external condensation of non-corrosive liquids, and light splashing of water.
This list is for the most part the ones we deal in most cases. There is this thing called NEMA 12 Ventilated. This is a standard NEMA 12 that has Fans and Filters cut into it that are designed to trap dirt and other foreign materials from entering the cabinet. In other words, it is for the most part a NEMA 1.
People seem to get confused about these ratings quite a lot of the time, so I thought this may be helpful to you all.