| Class of Insulation |
| Class |
Symbol |
Description |
| Class 0 |
|
Functional insulation without earthing devices. |
| Class I |
|
Functional insulation with terminal or cable complete with conductor for earthing. |
| Class II |
 |
Double insulation or reinforced insulation without earthing devices. |
| Class III |
 |
For connection at very low voltage. With no other internal or external circuits operating at voltages different from the very low safety voltage. |
| Degree of IP Protection |
| Class |
Symbol |
Description |
|
| IP20 |
|
Solid bodies larger than 12mm diam |
 |
| IP23 |
 |
Solid bodies larger than 12mm diam. Rainfall |
 |
| IP40 |
|
Solid bodies diam 1mm |
 |
| IP43 |
|
Solid bodies diam 1mm. Rainfall |
|
| IP44 |
 |
Solid bodies diam 1mm. Sprays from all directions |
 |
| IP54 |
 |
Partial protection against dust. Sprays from all directions |
 |
| IP55 |
 |
Partial protection against dust. Jets from all directions |
 |
| IP65 |
 |
Sealed against dust and jets from all directions |
 |
| IP68 |
 |
Sealed against dust operation while submerged for long periods at depth. |
 |
