specific to: The letter K is specified in ISO 20653 (replacing DIN 40050-9), and not in IEC 60529. IP69K and IPx9 DIN 40050-9 extended the newer IEC 60529 rating system with an IP69K rating for high-pressure, high-temperature wash-down applications. Enclosures conforming with ISO 20653:2013 must not only be dust-tight (IP6X), but also able to withstand high-pressure and steam cleaning. The IP69K standard was originally developed for road vehicles—especially those that need regular intensive cleaning (dump trucks, concrete mixers, etc.)—but it also finds use in other areas, such as food processing machinery and car wash systems. It was superseded by ISO 20653:2013 Road Vehicles-Degrees of protection (IP code), and complemented by the addition of a level 9 water ingress testing to IEC 60529, which includes essentially the same spray test as IP69K, but also includes, in Figure 10 of the standard, a drawing for a test fixture designed to verify the correct water pressure. Test setup The test specifies a spray nozzle that is fed with water at and a flow rate of . The nozzle is held 10–15 cm from the tested device at angles of 0°, 30°, 60° and 90° for 30 seconds each. The test device sits on a turntable that completes a rotation once every 12 seconds (5 rpm). The IPx9 specification details a freehand method for testing larger specimens that will not fit on a turntable (see table above). The free hand method also requires (at least) one additional minute of spray time (1 min/m2, 3 min. minimum). The test distance also increases to .175 m (0.15–0.2 m per section 14.2.9). United States (NEMA rating) In the U.S., the National Electrical Manufacturers Association defines NEMA enclosure types in NEMA standard number 250. The following table outlines which IEC 60529 IP code each respective NEMA guideline meets. Ratings between the two standards are not directly equivalent: NEMA ratings also require additional product features and tests (such as functionality under icing conditions, enclosures for hazardous areas, knock-outs for cable connections and others) not addressed by IP ratings. See also Appliance classes EN 62262 – IK code on resistance to mechanical impacts MIL-STD-810 U.S. Military connector specifications for military equivalents Water Resistant mark on wrist watches References External links 2004 version of the standard Certification marks Electrical enclosures IEC 60529