Where it is not necessary to specify a characteristic number, the letter “X” should be used instead.
(“XX” when both digits are removed).
Additional letters and/or complementary letters can be removed without changing their positions.
If more than one complementary letter is used, alphabetical order should be applied.
First Character: This character indicates the level of protection against the entry of foreign solid objects.
| Character | Article Entry | Access |
| 0 | Unprotected | Unprotected |
| one | Diameter ≥ 50 mm | with the back of the hand |
| 2 | Diameter ≥ 12.5 mm | fingering |
| 3 | Diameter ≥ 2.5mm | with tool |
| 4 | Diameter ≥ 1.0 mm | Such |
| 5 | Protected against dust | Such |
| 6 | Dustproof | Such |
Second Character: This character effects express the level of protection against harmful water ingress.
| Character | Water inlet |
| 0 | Unprotected |
| one | dripping vertically |
| 2 | Drip (15° inclined) |
|
3 |
Eruption |
| 4 | Vault |
| 5 | Jet |
| 6 | strong gush |
| 7 | temporary immersion |
| 8 | Continuous immersion |
Additional Letter: Indicates information about preventing access to hazardous parts. Its use is optional.
| Letter | Access |
| A | with the back of the hand |
| B | fingering |
| C | with tool |
| D | Such |
Supplementary Letter: Indicates special situations. Its use is optional.
| Character | Special case |
| H | high voltage device |
| M | Moving during water test |
| S | Motionless during water test |
| IN | Weather conditions |
