Emerging Technologies for Construction Delivery (2007) / Chapter Skim
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Pages 80-81
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80 Ingress Protection (IP) These protection standards are defined by the International Electrotechnical Commission and consist of rating scales designated by two to three digits (the third digit is commonly omitted)
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From page 81... ...
81 NEMA Rating Intended Use and Description 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, wind-blown 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 wind-blown 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 against hose-directed water, 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)
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