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The IP Code defined in international standard IEC 60529 classifies the level of protection provided against the intrusion of solid objects (including body parts like hands and fingers), dust, accidental contact, and water. more...

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It consists of the letters IP (for "international protection rating", sometimes also interpreted as "ingress protection rating") followed by two digits and an optional letter.

The digits ('characteristic numerals') indicate conformity with the conditions summarized in the tables below. Where there is no protection rating with regard to one of the criteria, the digit is replaced with the letter X.

For example, an electrical socket rated IP22 is protected against insertion of fingers and will not be damaged or become unsafe during a specified test in which it is exposed to vertically or nearly vertically dripping water. IP22 or IP2X are typical minimum requirements for the design of electrical accessories for in-door use. The standard aims to provide users more detailed information than vague marketing terms such as "waterproof".

First digit

The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g., electrical conductors, moving parts) and the ingress of solid foreign objects.

Second digit

Protection of the equipment inside the enclosure against harmful ingress of water.

Additional letters

The standard defines additional letters that can be appended to classify only the level of protection against access to hazardous parts by persons:

Further letters can be appended to provide additional information related to the protection of the device:

IP69K

German standard DIN 40050-9 extends the IEC 60529 rating system described above with an IP69K rating for high-pressure, high-temperature wash-down applications. Such enclosures must not only be dust tight (IP6X), but also able to withstand high-pressure and steam cleaning. The test specifies a spray nozzle that is fed with 80 °C water at 8–10 MPa (80–100 bar) and a flow rate of 14–16 L/min. The nozzle is held 10–15 cm from the tested device at angles of 0°, 30°, 60° and 90° for 30 s each. The test device sits on a turntable that rotates once every 12 s (5 rpm).

The IP69K test specification was initially developed for road vehicles, especially those that need regular intensive cleaning (dump trucks, cement mixers, etc), but also finds use in other areas (e.g., food industry).

Read more at Wikipedia.org