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Environmental Protection Code Description

International Protection Codes (IP)

IP numbers are used to specify the environmental protection of enclosures around electronic equipment.

First Number

  • 0 - No protection (sometimes X)
  • 1 - Protected against solid objects up to 50mm2
  • 2 - Protected against solid objects up to 12mm2
  • 3 - Protected against solid objects up to 2.5mm2
  • 4 - Protected against solid objects up to 1mm2
  • 5 - Protected against dust, limited ingress (no harmful deposit)
  • 6 - Totally protected against dust

Second Number

  • 0 - No protection (sometimes X)
  • 1 - Protected against vertically falling drops of water (i.e. condensation)
  • 2 - Protected against direct sprays of water up to 15° from vertical
  • 3 - Protected against direct sprays of water up to 60° from vertical
  • 4 - Protected against water sprayed from all directions - limited ingress permitted
  • 5 - Protected against low-pressure jets of water from all directions - limited ingress permitted
  • 6 - Protected against low-pressure jets of water, limited ingress permitted (i.e. ship deck)
  • 7 - Protected against the effect of immersion between 15cm and 1m
  • 8 - Protected against long periods of immersion under pressure

NEMA

  • National Electrical Manufacturers Association (NEMA) Standards Publication No. 250 guidelines are as follows:
  • NEMA 1 Indoor Use Protects against accidental contact by personnel and falling dirt
  • NEMA 2 Indoor Use Protects against falling dirt, liquid and light splash
  • NEMA 3 Outdoor Use Protects against rain, sleet, snow, dirt and dust
  • NEMA 3A Outdoor Use Protects against rain, sleet, snow, dirt and ice buildup
  • NEMA 4 In- or Outdoor Protects against dirt, dust, hosedown and heavy splash
  • NEMA 4X In- or Outdoor Protects against dirt, dust, hosedown and prolonged submersion
  • NEMA 6 In- or Outdoor Protects against dirt, dust, hosedown and occasional submersion
  • NEMA 6P In- or Outdoor Protects against dirt, dust, hosedown and prolonged submersion
  • NEMA 7 Indoor Use For use in areas of explosive gases or vapors or combustible dust
  • NEMA 9 Indoor Use For use in areas of atmospheres containing combustible dust
  • NEMA 12 Indoor Use Protects against dirt, dust, light splash and oil or coolant seepage
  • NEMA 13 Indoor Use Protects against dirt, dust, light splash and oil or coolant spray