Classification or IP protection rate
Second digit: Protection against external influence/penetration of water.
0 : No protection
1 : Minimal protection against dripping water
2 : Protection against dripping water
3 : Protection against rainwater
4 : Protection against spraying water
5 : Protection against water from a hose
6 : Protection against rippling/foamed water or steam
7 : Protection against water during short immersion
8 : Protection against water during long-lasting immersion