Industrial NEMA Indoor/Outdoor

NEMA Enclosure Types

Comparison of Specific Applications of Enclosures for Indoor Nonhazardous (non-classified) Locations
Provides a Degree of Protections Against the Following Conditions 1*  2*  4X  6P  12  12K   13
 Access to hazardous parts  X X X X X X X X X X
 Ingress of solid foreign objects (falling dirt)  X X X X X X X X X X
 Ingress of water (Dripping and light splashing)     X X X X X X X X X
 Ingress of solid foreign objects (Circulating dust, lint, fibers, and flyings **)      X X   X X X X X
Ingress of solid foreign objects (Settling airborne dust, lint, fibers, and flyings **)      X X X X X X X X
Ingress of water (Hosedown and splashing water)      X X   X X      
Oil and coolant seepage                X X X
Oil or coolant spraying and splashing                    X
Corrosive agents        X     X      
Ingress of water (Occasional temporary submersion)            X X      
Ingress of water (Occasional prolonged submersion)              X      

* These enclosures may be ventilated.
** These fibers and flyings are nonhazardous materials and are not considered Class III type ignitable fibers or combustible flyings. Class III type ignitable fibers or combustible flyings see the National Electrical Code, Article 500.
Table 2-1, NEMA Standards Publication 250-2008

Comparison of Specific Applications of Enclosures for Indoor & Outdoor Nonhazardous (non-classified) Locations
Provides a Degree of Protections Against the Following Conditions  3 3X 3R* 3RX* 3S 3SX 4 4X 6 6P
 Access to hazardous parts  X X X X X X X X X X
 Ingress of solid foreign objects (falling dirt)  X X X X X X X X X X
 Ingress of water (Dripping and light splashing)  X X X X X X X X X X
 Ingress of water (Rain, snow, and sleet **) X X X X X X X X X X
 Sleet **         X X        
 Ingress of solid foreign objects (Windblown dust, lint, fibers, and flyings)  X X     X X X X X X
 Ingress of water (Hosedown and splashing water)              X X X X
 Corrosive agents    X   X   X   X   X
 Ingress of water (Occasional temporary submersion)                  X X
 Ingress of water (Occasional prolonged submersion)                    X

* These enclosures may be ventilated.
** These fibers and flyings are nonhazardous materials and are not considered Class III type ignitable fibers or combustible flyings.
For Class III type ignitable fibers or combustible flyings see the National Electrical Code, Article 500.
Table 2-1, NEMA Standards Publication 250-2008