Las diferentes clases de protección IP se componen de dos dígitos.
Code one (index I) stands for the protection against solid foreign objects, while code number two (index II) about the water protection.
| Index I | Foreign bodies protection | Index II | Water protection |
| 0 | No protection against accidental contact, no protection against solid foreign bodies | 0 | No protection against water |
| 1 | Protection against contact with any large area by hand and against solid foreign bodies with Ø > 50 milímetro. | 1 | Protection against vertical water drips |
| 2 | Protection against contact with any large area by hand and against solid foreign bodies with Ø > 12 milímetro. | 2 | Protection against diagonal water drips(up to a 15° angle) |
| 3 | Protection against tools, wires or similar objects with Ø > 2.5 mm and against solid foreign bodies with Ø >2.5 mm | 3 | Protection against diagonal water drips(up to a 60° angle) |
| 4 | As index 3, however with Ø > 1 milímetro | 4 | Protection against splashed water from all directions |
| 5 | Protection against contact and interior injurious dust deposits | 5 | Protection against water (out of a nozzle) from all directions |
| 6 | Total protection against contact, protection against dust penetration | 6 | Protection against ingress of water in case of temporary flooding |
| 7 | Protection against ingress of water in case of temporary immersion | ||
| 8 | Protection against ingress of water in case of continuous immersion, requirements under agreement of user and manufacturer |
International protection classes according to DIN EN60529(IEC529/VDE 047 T1)
