| 0 | - No protection (Sometimes X) |
| 1 | - Protected against solid objects up to 50mm³ |
| 2 | - Protected against solid objects up to 12mm³ |
| 3 | - Protected against solid objects up to 2.5mm³ |
| 4 | - Protected against solid objects up to 1mm³ |
| 5 | - Protected against dust, limited ingress (no harmful deposit) |
| 6 | - Totally protected against dust |
| Second Number | |
| 0 | - No protection (Sometimes X) |
| 1 | - Protection against vertically falling drops of water (e.g. condensation) |
| 2 | - Protection against direct sprays of water up to 15 degrees from vertical |
| 3 | - Protection against direct sprays of water up to 60 degrees from vertical |
| 4 | - Protection against water sprayed from all directions - limited ingress permitted |
| 5 | - Protected against low pressure jets of water from all directions - limited ingress permitted |
| 6 | - Protected against low pressure jets of water, limited ingress permitted (e.g. ship deck) |
| 7 | - Protected against the effect of immersion between 15cm and 1m |
| 8 | - Protected against long periods of immersion under pressure |