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Protection against high-pressure, high-temperature jet sprays (wash-downs). Additional/Supplementary Letters Sometimes a letter is added to provide more specific info: A, B, C, D:

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Ingress of dust is not entirely prevented but must not interfere with equipment operation. Dust-tight Complete protection; no ingress of dust permitted. Second Numeral: Liquids Protection Level Typical Test Condition 0 No protection No resistance to water ingress. 1 Vertically dripping water 10-minute exposure to vertically falling drops. 2 Dripping water (15° tilt) Protection against high-pressure

: Beyond keeping water out, it specifies how enclosures protect people from accessing hazardous internal parts. iec 60529 pdf best