- The enclosure class is designated according to DIN 40050, by IP and a two-figure code number.
1st digit Degree of protection against ingress of solid bodies:
0 no special protection
1 solid bodies with dia. > 50 mm, no protection against intentional penetration
2 solid bodies with dia. > 12 mm, warding off fingers etc.
3 solid bodies with dia. > 2.5 mm, warding off tools, wires, etc. (thickness > 2.5 mm)
4 solid bodies with dia. > 1 mm, warding off tools, wires, etc. (thickness > 1 mm)
5 dust in harmful quantities, complete shock-hazard protection
6 dust (dust-tight), complete shock-hazard protection - 2nd digit Degree of protection against water
0 no special protection
1 water dripping vertically
2 water dripping at angles up to 15° from vertical
3 water dripping at angles up to 60° from vertical (spraying water)
4 water from all directions (splashing water)
5 water from a nozzle from all directions (hose-water)
6 heavy seas or strong jet of water (flooding)
7 water, if the device is immersed in water under specified conditions of pressure and time (immersion)
8 water, if the device is submerged constantly. The manufacturer must describe the conditions (submersion)
(For numbers 1 to 8, water must not penetrate in harmful quantities.)
Example: IP 65 A device thus designated is dust-tight, and protected against hose-water.