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The letter K is specified in ISO 20653 (replacing DIN 40050-9) and not in IEC 60529.
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[[Deutsches Institut für Normung|DIN]] 40050-9 extended the newer IEC 60529 rating system with an '''IP69K''' rating for high-pressure, high-temperature wash-down applications.<ref>{{citation | title = [[DIN]] 40050-9: ''Straßenfahrzeuge; IP-Schutzarten; Schutz gegen Fremdkörper, Wasser und Berühren; Elektrische Ausrüstung'' [Road vehicles; degrees of protection (IP-code); protection against foreign objects, water and impact; electrical equipment] | date = May 1993}}. An English translation of the German original is available from DIN.</ref> Enclosures conforming with ISO 20653:2013 must not only be dust-tight (IP6X), but also able to withstand high-pressure and steam cleaning.
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