NEMA Type 4 enclosure is for outdoor use and protects against dirt, rain, sleet, snow, splash and hose down with noncorrosive liquid.
NEMA Type 4 and 12 enclosures are for either indoor or outdoor use and protect against dirt, rain, sleet, snow, splash and hose down with noncorrosive liquids.
NEMA Type 12 enclosure is for indoor use and protects against dirt and dripping and light splash of noncorrosive liquid.