| 1 | Indoor use primarily to provide a degree of protection against limited amounts of falling dirt. |
| 2 |
Indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt. |
| 3 |
Outdoor use primarily to provide a degree of protection against rain, sleet, wind blown dust and damage from external ice formation. |
| 3R |
Outdoor use primarily to provide a degree of protection against rain, sleet, and damage from external ice formation. |
| 3S |
Outdoor use primarily to provide a degree of protection against rain, sleet, windblown dust and to provide for operation of external mechanisms when ice laden. |
| 4 |
Indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, hose-directed water and damage from external ice formation. |
| 4X |
Indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, hose-directed water, and damage from external ice formation. |
| 5 |
Indoor use primarily to provide a degree of protection against settling airborne dust, falling dirt, and dripping noncorrosive liquids. |
| 6 |
Indoor or outdoor use primarily to provide a degree of protection again hose-directed water, and the entry of water during occasional temporary submersion at a limited depth and damage from external ice formation. |
| 6P |
Indoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during prolonged submersion at a limited depth and damage from external ice formation. |
| 7 |
Indoor use in locations classified as Class I, Division 1, Groups A, B, C or D hazardous locations as defined in the National Electric Code (NFPA 70) (Commonly referred to as explosion-proof). |
| 8 |
Indoor or outdoor use in locations classified as Class I, Division 2, Groups A, B, C or D hazardous locations as defined in the National Electric Code (NFPA 70) (commonly referred to as oil immersed). |
| 9 |
Indoor use in locations classified as Class II, Division 1, Groups E, F and G hazardous locations as defined in the National Electric Code (NFPA 70) (commonly referred to as dust-ignition proof). |
| 10 |
Intended to meet the applicable requirements of the Mine Safety and HealthAdministration (MSHA). |
| 12 and 12K |
Indoor use primarily to provide a degree of protection against circulating dust, falling dirt, and dripping noncorrosive liquids. |
| 13 |
Indoor use primarily to provide a degree of protection against dust, spraying of water, oil, and noncorrosive coolant. |