The charts here show the various conditions that are met by the most popular NEMA standards. NEMA 1 protects only against accidental touch of the internal components. NEMA 4 restricts the ability to touch the internal components and protects against falling dirt, dripping or lightly splashed liquids, circulating dust or dirt, and water sprayed by a hose. The X suffix notes that the box is also protected against corrosion. NEMA 6 protects against all of these, plus it can be immersed under a prolonged submersion. NEMA 12 is somewhat different, as it does not protect against sprayed water but does protect against dripping water and oil. NEMA 13 is like NEMA 12, but also protects against the spraying and splashing of oils.