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Home / Technical Articles / IP Protection Degree (IEC 60529) Explained

IP Protection Degree (IEC 60529) ExplainedThe protection of enclosures against ingress of dirt or against the ingress of water is defined in IEC529 (BSEN60529:1991). Conversely, an enclosure which protects equipment against ingress of particles will also protect a person from potential hazards within that enclosure, and this degree of protection is also defined as a standard.

The degrees of protection are most commonly expressed as ‘IP’ followed by two numbers, e.g. IP65, where the numbers define the degree of protection. The first digit shows the extent to which the equipment is protected against particles, or to which persons are protected from enclosed hazards. The second digit indicates the extent of protection against water.

The wording in the table is not exactly as used in the standards document, but the dimensions are accurate.

IP Degree of Protection according to EN/IEC 60529

First Figure Second Figure
0 No protection 0 No protection
1 Protected against a solid object 50 mm or greater 1 Protected against vertically dripping water
2 Protected against a solid object 12 mm or greater 2 Protected against vertically dripping water, when tilted 15 degrees
3 Protected against a solid object 2,5 mm or greater 3 Protected against water spraying at an angle up to 60 degree
4 Protected against a solid object 1 mm or greater 4 Protected against water splashing from any direction
5 Dust protected 5 Protected against jets of water from any directions
6 Dust tight 6 Protected against powerful jets of water from any directions
7 Protected against immersion between a depth of 150 mm and 1000 mm
8 Protected against submersion

Correlations between IP (IEC) and NEMA 250 standards

  • IP10 -> NEMA 1
  • IP11 -> NEMA 2
  • IP54 -> NEMA 3 R
  • IP52 -> NEMA 5-12-12 K
  • IP54 -> NEMA 3-3 S
  • IP56 -> NEMA 4-4 X
  • IP67 -> NEMA 6-6 P

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Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.


  1. sethuraman
    Nov 15, 2018

    What is IP55W and what is the difference between IP55 and IP55W….kindly help me out.


  2. Gracie
    May 28, 2018

    Thanks for the information, i’m wondering how do companies get the right to declare that their products are rated ‘IP67’? Is there a governing body that runs the tests, or do the companies do the test on their own and submit the results somewhere?

  3. gustavo cordoba
    Oct 21, 2015

    I want to know if a product (multimeter) rated with Ip 65 can work properly under condictions of 90% of (HR) relative Humitdity in the amazon?
    Thanks and best regards,

  4. shailesh
    Aug 31, 2015

    i have one query..
    do I need to carry out on each starter cum control panel IP test ?
    can you confirm in relation with IS/IEC standard.

  5. shelesh Tiwari
    Dec 31, 2014

    corelation between IP and NEMA is just a comparison i guess. i am interested to know whether this corelation is provided by standard.
    to put in other words “can a assembly certified to IP 56 be declared to be certified for NEMA 4-4X, based on IP 56 Testing only?

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