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IP Protection Classes Reference

Reference overview of ingress protection rating structure.

Reference data

First digit: solids/access protection

First digit: solids/access protection
Digit	Function
0	No protection specified
1	Objects of diameter 50 mm and greater
2	Objects of diameter 12.5 mm and greater
3	Objects of diameter 2.5 mm and greater
4	Objects of diameter 1 mm and greater
5	Dust-protected: limited ingress must not impair operation
6	Dust-tight
X	Not specified for this characteristic

Second digit: water test category

Immersion does not automatically certify jet resistance. Read the complete rating and test conditions.

Second digit: water test category
Digit	Function
0	No protection specified
1	Vertically falling drops
2	Drops with enclosure tilted up to 15°
3	Spraying water
4	Splashing water
5	Water jets
6	Powerful water jets
7	Temporary immersion under specified test conditions
8	Continuous immersion under manufacturer-specified conditions
9	High-pressure, high-temperature water jets
X	Not specified for this characteristic

What this page helps with

Compare IP digits and their separate test meanings before selecting an enclosure for its environment.

IP ratings describe enclosure protection against solid objects and water under defined test conditions. They help you compare product suitability for dust, splashing, jets or immersion, but they do not describe every real installation risk.

This reference is useful when you are choosing an enclosure, checking a datasheet, or trying to understand whether a device belongs indoors, outdoors or in a washdown environment.

Formula or method

The page is structured as a practical reference: start with the visible table, diagram and labels, then compare them with the exact connector, device, enclosure or symbol set in front of you.

Use the listed sources to confirm revision, naming and application context. Similar labels can hide different electrical limits, pin functions or test conditions, so the page should be treated as a guided reference rather than a universal standard text.

How to use

Read the first digit as protection against solids or dust, and the second digit as protection against water.
Compare the rating with the actual exposure. A workshop with dust, cleaning spray or condensation is different from a dry office wall.
Check the manufacturer datasheet for orientation, cable entry, sealing accessories and temperature limits because the bare IP code is not the whole story.

Practical examples

Example 1: IP54 versus IP65

IP54 suggests dust-protected and splash-resistant equipment, while IP65 points to a dust-tight enclosure that resists water jets. That does not automatically mean both are suitable for the same cleaning regime or mounting method.

Example 2: IP67 planning caveat

IP67 usually relates to temporary immersion under stated test conditions. It does not mean a device is permanently safe underwater, chemically resistant or suitable for every cable gland and connector arrangement.

Common mistakes

Reading an IP rating as a lifetime waterproof guarantee.
Ignoring orientation, gasket condition or cable-entry sealing.
Assuming the enclosure test automatically proves the full installed assembly.

Limitations

Read the manufacturer’s complete test conditions, especially for IPX8 and water jets. A higher second digit is not a universal promise of resistance to every lower-numbered water test.
The IP code depends on the manufacturer test setup and exact product configuration.
Real environment, UV, chemicals, heat and installation quality still matter.
Use the datasheet and local project requirements before final procurement or installation.

FAQ

Is IP67 always better than IP65?

Not automatically. It depends on the actual exposure, maintenance method and accessories used with the enclosure.

Does IP rating cover corrosion or UV resistance?

No. Those are separate material and environment questions.

Can I choose an outdoor enclosure from IP alone?

No. The outdoor environment, mounting details and manufacturer instructions still need to be checked.

Related tools

Explanation updated: 2026-09-15

This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.