6 - protection against access to hazardous parts with wire, dustproof protection 8 - protection against the effects of continuous immersion in water (housing permanently immersed in water, under conditions agreed between the manufacturer and the user, but stricter than according to number 7) The first digit - means that the enclosure provides protection for people against access to dangerous parts located inside, and at the same time provides protection against the penetration of foreign solids. The second digit – means that the housing provides protection against the effects of water penetration.