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Degree of Protection IP 56 "Dust-protected" Ingress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment; complete protection against contact (dust proof) and by spraying the enclosure from all practicable directions with a stream of water from a test nozzle of 12,5mm ∅ .
The chart below shows the various degrees of protection IP that can be performed.