What Are IP Protection Classes?
IP stands for Ingress Protection. The first digit describes protection against contact, solid objects and dust; the second digit describes protection against water.
For example, in IP65, the digit 6 means dust-tight protection and the digit 5 indicates resistance to water jets.
First Digit: Solid Object and Dust Protection
The first digit defines protection against contact and solid particle ingress.
| Digit | Level | Meaning |
|---|---|---|
| 0 | No protection | No specific protection |
| 1 | 50 mm and larger | Protection against large surfaces |
| 2 | 12.5 mm and larger | Finger protection |
| 3 | 2.5 mm and larger | Tools and thick wires |
| 4 | 1 mm and larger | Small wires and small parts |
| 5 | Dust protected | Dust may enter but not enough to impair operation |
| 6 | Dust-tight | Complete protection against dust ingress |
Second Digit: Water Protection
The second digit defines the level of protection against dripping, spraying, jets or immersion.
| Digit | Level | Meaning |
|---|---|---|
| 0 | No protection | No special water protection |
| 1 | Vertical dripping | Protection against vertical water drops |
| 2 | Dripping up to 15° | Protection when tilted |
| 3 | Spraying water | Water sprayed at defined angles |
| 4 | Splashing water | Splashing from any direction |
| 5 | Water jets | Low-pressure water jets |
| 6 | Powerful water jets | More demanding jet exposure |
| 7 | Temporary immersion | Defined time and depth |
| 8 | Continuous immersion | As specified by the manufacturer |
Common IP Ratings
IP20
Dry indoor areas with basic touch protection.
IP44
Protection against splashing water and small solid objects.
IP54
Common for industrial indoor panels exposed to dust and splashing.
IP55
Improved protection against dust and low-pressure water jets.
IP65
Dust-tight and protected against water jets; common outdoors.
IP66
Dust-tight with stronger water jet protection.
IP67
For equipment with risk of temporary immersion.
IP68
For longer immersion under manufacturer-defined conditions.
Difference Between IP65 and IP66
Both are dust-tight. IP65 covers water jets; IP66 is intended for more powerful water jets and harsher exposure.
If the panel may be washed down or exposed to severe weather, IP66 should be considered.
Difference Between IP67 and IP68
IP67 covers temporary immersion. IP68 covers longer or continuous immersion under conditions declared by the manufacturer.
For panels, cable entries, ventilation and condensation must be assessed in addition to the IP code.
Which IP Class Should Be Used for Electrical Panels?
The selection depends on location, dust, humidity, water exposure and maintenance conditions.
| Application | Suggested IP | Note |
|---|---|---|
| Clean dry indoor area | IP20 - IP40 | Closed technical rooms |
| Industrial indoor area | IP54 - IP55 | Dust and light water exposure |
| Outdoor panel | IP65 | Rain, dust and water jet risk |
| Harsh outdoor area | IP66 | Powerful jets and severe site conditions |
| Temporary immersion risk | IP67 | Cable entries must be checked carefully |
Conclusion
The IP class must match the real environment. A well-selected rating improves equipment life, reduces maintenance risk and supports electrical safety.
FAQ
What does an IP rating indicate?
It indicates the enclosure’s protection against solid objects, dust and water.
Is IP65 suitable outdoors?
Often yes, but IP66 should be considered where powerful jets or washdown are expected.
What is the difference between IP67 and IP68?
IP67 is temporary immersion; IP68 is longer immersion under manufacturer-defined conditions.