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IP code protection grade is introduced

IP is Ingress Protection, IP rating for electrical equipment enclosure Protection grade of foreign invasion, the source is the international electrotechnical commission IEC 60529 standard. In the standard,
in view of the electrical equipment enclosure protection of foreign body, IP protection grade is composed of two Numbers, format IPXX, where XX is two digits, the first digital representation contact
protection and foreign body protection level (dust, the highest level is 6), the second digit said waterproof protection level is highest level (8)

Note: with Japan industrial standard JIS waterproof level is close to Japan's industrial JIS waterproof is highest magnitude 9 (IP9K)

The first digit: dust level

The second digit: waterproof level