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Answer
IP stands for Ingress Protection. Its a standard we use to check the sealability of a product once it is installed.
It is composed as IP## , where first digit is for dust/solid objects and the 2nd digit, is for liquids.
Here is the meaning for each numerical code:
| First Digit | Description |
|---|---|
| 0 | No protection |
| 1 | Ingress of solid object diameter 50 mm is protected |
| 2 | Ingress of solid object diameter 12.5 mm is protected |
| 3 | Ingress of solid object diameter 2.5 mm is totally protected |
| 4 | Ingress of solid object diameter 1.0 mm is totally protected |
| 5 | Protected against harmful dust |
| 6 | Totally protected against dust |
| 2nd Digit | Description |
|---|---|
| 0 | No protection no protection against liquid object No test |
| 1 | Protection against water drop vertically |
| 2 | Protection against water drop 15° Tilt from its normal position |
| 3 | Protection against water spray 60° from the vertical direction |
| 4 | Protection from water splash from all direction |
| 5 | Protection from water jets from all direction |
| 6 | Protection from strong water jets from all direction |
| 7 | Protection from water dip 1 m depth water for 30 min |
| 8 | Protection from water sink should be decided between customer and manufacturer |