IEC 60529 - Degrees of Protection Provided by Enclosures (IP Code)
Degrees of protection provided by enclosures (IP Code)
How to read an IP code
Key facts
- Full title
- Degrees of protection provided by enclosures (IP Code)
- Published by
- IEC; adopted in Europe by CENELEC as EN 60529
- Code format
- IP + solids digit (0-6) + water digit (0-9), plus an optional access letter (A, B, C, D) and supplementary letter (H, M, S, W)
- What X means
- The characteristic was not declared or not tested - it does not mean zero protection
- The K suffix
- Comes from ISO 20653 (road vehicles), not from IEC 60529; the IEC high-pressure test itself is IPX9
- Applies to
- Enclosures for electrical equipment with a rated voltage up to 72.5 kV
- Does not cover
- Corrosion, icing, oil and coolant, hazardous atmospheres, or mechanical impact (impact is the IK code, IEC 62262)
Reading an IP code
An IP code reads left to right: the letters IP, then the first characteristic numeral, then the second characteristic numeral, with optional letters where applicable. The first and second positions describe different protection characteristics.
When a characteristic is not specified in the designation, X is used in that position. IPX4 therefore declares water numeral 4 while leaving the first characteristic unspecified; IP6X declares solids numeral 6 while leaving the water characteristic unspecified. X is not a score of zero and does not by itself prove whether other evidence or testing exists.
First digit: solids and contact
The first digit runs from 0 to 6 and covers two linked things at once: how well the enclosure keeps out solid foreign objects, and how well it protects people from touching hazardous parts inside.
It climbs from no protection (0), through progressively smaller objects, to dust-protected (5, limited dust ingress with no harmful effect) and finally dust-tight (6, no dust ingress at all). A first digit of 6 is the ceiling; there is no 7, 8 or 9 for solids.
Second digit: water
The second digit runs from 0 to 9. Levels 1 to 4 cover dripping, spraying and splashing water; 5 and 6 cover water jets and powerful water jets; 7 and 8 cover immersion; and 9 covers close-range high-pressure, high-temperature jets.
A common trap is treating the second digit as a single ladder. It is not. Jet tests (5, 6) and immersion tests (7, 8) check different things, so passing one does not imply the other. A product rated for immersion is not automatically rated against high-pressure jets unless it was tested for them as well.
IEC IP69, commercial IP69K wording and ISO K-bearing codes
IEC 60529 includes water numeral 9 for high-pressure, high-temperature water-jet protection. ISO 20653 is a separate road-vehicle standard and uses K-bearing designations for special road-vehicle requirements that are not covered by IEC 60529 in the same notation.
Commercial literature often uses “IP69K” as shorthand for high-pressure, high-temperature cleaning resistance. Do not silently convert that wording into IEC IP69 or into an ISO code such as IP6K9K. For a real product, verify the exact designation, cited standard, edition and declared test conditions.
Why an IP rating does not convert back to NEMA
NEMA enclosure Types and IEC IP codes overlap, but the two systems do not cover the same set of characteristics. NEMA Types can include conditions such as corrosion, icing, oil or coolant exposure and other construction requirements that a two-character IP code does not express.
NEMA has published one-way correlations for particular editions and applications, while explicitly warning that an IP degree cannot be treated as an equivalent NEMA Type. Standard Clarity therefore does not automatically relabel products between the systems; use an attributed, edition-specific cross-reference only as screening information.
IP code digits at a glance
| Digit | First digit - solids and contact | Second digit - water |
|---|---|---|
| 0 | No protection | No protection |
| 1 | Objects larger than 50 mm (e.g. back of hand) | Vertically dripping water |
| 2 | Objects larger than 12.5 mm (e.g. a finger) | Dripping water with the enclosure tilted up to 15 degrees |
| 3 | Objects larger than 2.5 mm (e.g. a tool) | Spraying water up to 60 degrees from vertical |
| 4 | Objects larger than 1 mm (e.g. a wire) | Splashing water from any direction |
| 5 | Dust-protected (limited ingress, no harmful effect) | Water jets from a 6.3 mm nozzle |
| 6 | Dust-tight (no dust ingress) | Powerful water jets from a 12.5 mm nozzle |
| 7 | Not defined for the first digit | Temporary immersion up to about 1 m |
| 8 | Not defined for the first digit | Continuous immersion beyond 1 m, on conditions set by the manufacturer |
| 9 | Not defined for the first digit | Close-range high-pressure, high-temperature jets (IPX9) |
Tools that use this standard
Related standards
| Standard | Relationship | What it means |
|---|---|---|
| ISO 20653 | Related road-vehicle ingress standard | Uses K-bearing designations for special road-vehicle requirements. Keep the ISO notation and test context distinct from IEC 60529 IP69 and from commercial “IP69K” shorthand. |
| NEMA 250 / UL 50E | Cross-referenced with | North American enclosure Types overlap with IP ingress characteristics but include additional requirements. Cross-reference only from an identified source/edition and do not treat it as permission to relabel a product. |
| IEC 62262 (IK code) | Complemented by | Mechanical impact resistance, which IEC 60529 dropped after its second edition, is rated separately by the IK code. |
Related guides
Frequently asked questions
What does IP stand for in an IP rating?
What does the X mean in a rating like IPX4 or IP6X?
What is the difference between IP67 and IP68?
Is IPX5 or IPX7 more waterproof?
What does IP69K mean, and is it part of IEC 60529?
Can I convert an IP rating to a NEMA type?
Does IEC 60529 cover mechanical impact resistance?
Source: IEC webstore. An overview for design reference - verify against the current edition before relying on it for compliance.