[Useful Information] What does "IP" for waterproof performance mean?

There is an indicator called "IP" that represents waterproof performance.
In Japan, a standard based on one of the international technical standards of IEC, specifically IEC60529, has been established for "Protection degrees of electrical equipment enclosures (IP code)."
The protection degree standard indicates how much protective performance the enclosure part of electrical equipment has to protect the internal components. It standardizes the verification methods for this protection performance.
This protection performance is mainly considered from the following three perspectives:
(1) Protection of the human body from approaching dangerous areas within the enclosure
(2) Protection of electrical equipment inside the enclosure from the intrusion of solid objects from the outside
(3) Protection of electrical equipment inside the enclosure from harmful effects due to water ingress
Additionally, "IP" is represented by a two-digit number, such as "IP65," where the first digit indicates dust protection performance and the second digit indicates waterproof performance.

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