Definition: NEMA 4 Enclosures provide protection against solid objects such as falling dirt, circulating dust, airborne dust, and windblown dust. Similarly, they give the same level of protection against ingress of water, dripping, light splashing, splashing and hose down (directed) water. Generally, they are constructed for either indoor or outdoor uses.
General Note: NEMA 4 Enclosures are very similar to NEMA 4X Enclosures in terms of protection. They both provide the almost same standard level of ingress protection except the NEMA 4X rating requires more material corrosion resistance.