Two types of protection : Solids and Water
Protection From Solids
1 - Protection againsr a solid object greater than 50 mm such as hand
2 - protection against a solid object greater than 12.5mm such as a finger
3 - Protection against a solid object greater than 2.5 mm such as a screwdriver
4 - Protection against a solid object greater than 1 mm such as a wire
5 - Dust protected.Limited ingress of dust permitted.Will not interfer with operation of the equipment.Two to eight hours
6 - dust tight.No ingress of dust.Two to eight hours.
Protection from Water.
1 - Protection against vertically falling drops of water.Limited ingress permitted.
2 - protection against vertically falling drops of water with enclosure tilted up to 15 degress from the vertical.Limited ingress permitted.
3 - Protected against sprays of water up to 60 degrees from the vertical.Limited ingress permitted for three minutes
4 - Protected against water splashed from all directions.Limited ingress permitted.
5 - Protected against jets of water.Limited ingress protected.
6 - water from heavy seas or water projected in powerful jets shall no enter the enclosure in harmful quantities.
7 - Prediction against the effects of immersion in water between 15 cm and 1m for 30 minutes
8 - Protection against the effects of immersion in water under pressure for long periods.