The IP rating is a two-digit code defined by IEC 60529 that indicates the degree of protection an electrical switchboard enclosure provides against solid objects and water. The first digit indicates protection against dust and contact (0–6), and the second digit protection against water (0–9K). For example, IP54 describes a dust-protected enclosure that is protected against water splashing from any direction.
How to Read an IP Code
An IP code is read from left to right, and each digit represents an independent test result. The digits are not interchangeable: high water protection does not automatically mean high dust protection.IP 5 4
Code prefix
Stands for Ingress Protection and refers to the tests defined in IEC 60529.First digit – solid objects
Dust-protected: dust cannot enter in a quantity that would interfere with operation, and contact with hazardous parts is prevented.Second digit – water
Protected against water splashing from any direction; does not include protection against water jets or immersion.First Digit: Protection Against Solid Objects and Contact
The first digit defines the size of solid objects that can enter the enclosure and the protection against contact with hazardous parts.| Digit | Protection | Description |
|---|---|---|
| 0 | Not protected | No special protection against solid objects. |
| 1 | ≥ 50 mm | Prevents access to hazardous parts by large objects such as the back of a hand. |
| 2 | ≥ 12.5 mm | Prevents entry of fingers or objects of similar size. |
| 3 | ≥ 2.5 mm | Prevents entry of tools such as screwdrivers and thick wires. |
| 4 | ≥ 1.0 mm | Prevents entry of thin wires and small screws. |
| 5 | Dust-protected | Dust ingress is not completely prevented, but dust cannot enter in a quantity that would interfere with operation. |
| 6 | Dust-tight | Dust ingress is completely prevented. |
Second Digit: Protection Against Water
The second digit defines the enclosure’s resistance to water ingress. The values are not cumulative: an IPX7 enclosure may not meet IPX5 unless it has also been tested for it.| Digit | Protection | Description |
|---|---|---|
| 0 | Not protected | No special protection against water. |
| 1 | Vertically dripping water | Protected against vertically dripping water. |
| 2 | Dripping water, tilted 15° | Protected against dripping water when the enclosure is tilted up to 15°. |
| 3 | Spraying water (rain) | Protected against water sprayed at an angle of up to 60° from the vertical. |
| 4 | Splashing water | Protected against water splashing from any direction. |
| 5 | Water jets | Protected against low-pressure water jets from any direction through a 6.3 mm nozzle. |
| 6 | Powerful water jets | Protected against powerful water jets through a 12.5 mm nozzle. |
| 7 | Temporary immersion | Protected against immersion at a depth of 1 m for 30 minutes. |
| 8 | Continuous immersion | Protected against continuous immersion under conditions specified by the manufacturer. |
| 9K | High-pressure jets | Protected against high-pressure, high-temperature water jets. |
The IP rating belongs to the whole switchboard, not just the enclosure.
Even if the enclosure is IP65, the switchboard as a whole will not achieve the declared rating if the cable glands, door gasket or lock area are not suitably selected; water always enters through the weakest point.For switchboards operating outdoors, condensation must be considered as well as rain and washdown water. In spaces with temperature differences, moisture can condense inside the switchboard and cause corrosion and insulation problems.Cable entries are planned from the bottom face and sized to match the gland diameter; unused holes are closed with blanking plugs.Mounting orientation and door sealing determine whether the switchboard keeps the same rating after maintenance or cleaning; gasket surfaces are checked after each opening, and deformed gaskets are replaced.The declared IP rating is kept in the project file together with the enclosure manufacturer’s test report.Common IP Ratings for Switchboards
The list below summarizes the degrees of protection most often encountered in low voltage switchboard applications and their typical uses.| IP | Suitability | Typical use |
|---|---|---|
| IP20 | Inside switchboards, clean and dry environments | Indoor electrical rooms, offices and administrative areas |
| IP31 | Indoor areas with a slight risk of dripping | Technical rooms, storage areas and corridors |
| IP41 | Protection against small objects and dripping | Edges of production areas, service corridors |
| IP54 | Dusty indoor industrial areas with a splash risk | Factory production lines, workshops, industrial zone facilities |
| IP55 | Environments with washdown and heavy dust | Food, cement and mining facilities |
| IP65 | Outdoors, dust-tight and resistant to water jets | Field switchboards, building exteriors, open-air installations |
| IP66 | Harsh outdoor conditions, powerful water jets | Ports, water treatment plants, washdown areas |
IK Code: Mechanical Impact Resistance
While the IP code indicates protection against dust and water, the IK code defined in EN 62262 expresses the enclosure’s resistance to external mechanical impacts in joules. In production areas with an impact risk and in public areas, the IK value should be specified alongside the IP code.| IK code | Impact energy |
|---|---|
| IK00 | Not protected |
| IK01 | 0.14 J |
| IK02 | 0.20 J |
| IK03 | 0.35 J |
| IK04 | 0.50 J |
| IK05 | 0.70 J |
| IK06 | 1 J |
| IK07 | 2 J |
| IK08 | 5 J |
| IK09 | 10 J |
| IK10 | 20 J |
How to Choose the Right IP Rating
- Define the installation environment. Will the switchboard be indoors, outdoors or on a line that is washed down?
- Assess the dust and particle load. If fine particles such as cement, flour or sawdust are present, the first digit should be 5 or 6.
- Determine how water will reach it. Clarify which scenario applies: dripping, splashing, pressure washing or immersion.
- Check the heat balance. A high IP rating makes heat dissipation harder; plan air conditioning, a heat exchanger or filtered fans if necessary.
- Add the mechanical impact risk. If there is forklift traffic or public access, specify a suitable IK value.
- Preserve integrity. Cable glands, blanking plugs and gaskets must have the same degree of protection.
Common Mistakes
- Choosing a high IP rating without taking heating inside the switchboard into account.
- Assuming that an IPX7 enclosure automatically meets IPX5 as well.
- Using low-rated glands or push buttons on a switchboard enclosure with a high IP rating.
- Drilling holes on site without using suitable plugs, which invalidates the rating.
- Neglecting gasket maintenance; aging gaskets reduce the degree of protection.
- Not specifying an IK value in areas with a mechanical impact risk.
The right degree of protection for your switchboard
IP and IK selection should take the environmental conditions, heat balance and maintenance scenario into account together. Devpan determines the appropriate enclosure rating for the environment where your project will be installed and delivers the switchboard verified under IEC 61439.Contact us for enclosure selection- Standard: IEC 60529 (EN 62262 / IK code for mechanical impact)
- Structure: IP + first digit (solid objects) + second digit (water)
- First digit: 0 not protected → 6 dust-tight
- Second digit: 0 not protected → 8 continuous immersion, 9K high-pressure jets
- Letter X: indicates that the relevant degree of protection is not specified (e.g. IPX5)
- Common for switchboards: indoor IP20–IP54, industrial IP54–IP55, outdoor IP65–IP66
Frequently Asked Questions About IP Ratings
What is an IP rating?
An IP rating is a two-digit code under IEC 60529 that indicates the degree of protection an enclosure provides against solid objects and water. The first digit indicates protection against solid objects and contact; the second digit protection against water.
What does IP54 mean?
IP54 means the enclosure is dust-protected (dust cannot enter in a quantity that would interfere with operation) and protected against water splashing from any direction. It is the most common rating for indoor industrial switchboards.
What is the difference between IP65 and IP66?
Both are dust-tight. IP65 provides protection against low-pressure water jets through a 6.3 mm nozzle, while IP66 protects against powerful water jets through a 12.5 mm nozzle. IP66 is preferred in areas that are washed down.
Which IP rating should be chosen for an outdoor switchboard?
At least IP54 is recommended for switchboards used outdoors, and IP65 or IP66 for field switchboards directly exposed to rain and dust. Additional measures against sun, heat and UV should also be considered.
Is a switchboard with a higher IP rating always better?
No. A higher IP rating means a more tightly sealed enclosure, which makes it harder to dissipate heat from inside. In high-current switchboards, choosing a higher IP rating than necessary can cause overheating and require air conditioning.
What does the letter X in an IP code mean?
An X is used in a position when the relevant degree of protection has not been tested or specified. For example, IPX5 means protection against water jets, with no solid-object protection specified.
Are the IK code and the IP code the same thing?
No. The IP code indicates protection against dust and water, while the IK code under EN 62262 indicates the enclosure’s resistance to mechanical impact. For example, IK10 means resistance to an impact energy of 20 joules.
Does the IP rating still apply when the switchboard door is open?
No. The declared IP rating applies when the door is closed and all gaskets, blanking covers and cable glands are in place. A missing gland or damaged gasket invalidates the rating.
Related Technical Information
- Forms of Separation – IEC 61439 form types and internal separation levels
- Cable Current-Carrying Capacities – YVV (NYY) TS 212 current tables
- Copper Busbar Current-Carrying Capacities – copper busbar tables and correction factors
- Current Transformer C/k Setting – sensitivity setting of the compensation relay
- DevBox Sub-Distribution Board – enclosure options suited to site conditions
- DevPanel Main Distribution Board – main distribution switchboards