| Protection Classification | Description |
| 0 | No protection |
| 1 | Protection against drops of condensed water. Drops of condensed water falling on the enclosure have no harmful effects. |
| 2 | Protection against falling liquid which when the enclosure is tilted at an angle up to 15 degrees from the vertical, shall have no harmful effect. (Drip proof) |
| 3 | Protection against rain. Driving rain at an angle of up to 60 degrees from the vertical shall have no harmful effect. (Rain proof) |
| 4 | Protection against splashing. Liquid splashed from any direction shall have no harmful effect. (Splash proof) |
| 5 | Protection against water jets. Water projected by a nozzle from any direction under stated conditions shall have no harmful effect. (Jet proof) |
| 6 | Protection against conditions on ship’s decks, usually referred to as “deck watertight” equipment. Water from heavy seas shall not enter the enclosure under prescribed conditions. |
| 7 | Protection against immersion in water. It shall not be possible for water to enter the enclosure under stated conditions of pressure and time. |
| 8 | Protection against indefinite immersion in water. Under specified pressure, it shall not be possible for water to enter the enclosure. |