IP Protection Degree (IEC 60529) Explained

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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 FigureSecond Figure
0No protection0No protection
1Protected against a solid object 50 mm or greater1Protected against vertically dripping water
2Protected against a solid object 12 mm or greater2Protected against vertically dripping water, when tilted 15 degrees
3Protected against a solid object 2,5 mm or greater3Protected against water spraying at an angle up to 60 degree
4Protected against a solid object 1 mm or greater4Protected against water splashing from any direction
5Dust protected5Protected against jets of water from any directions
6Dust tight6Protected against powerful jets of water from any directions
7Protected against immersion between a depth of 150 mm and 1000 mm
8Protected 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

Edvard - 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 fascilities. Professional in AutoCAD programming. Present on