Guangzhou describes the meaning of distribution box IP rating:

IP level (dustproof and waterproof) Definition of a: IP65
Reference standard: GB 4208 2008 "Enclosure protection class (IP code)"
IP5X and IPX4 is IP54, the standard of these two terms are defined as:
Dustproof IP5X: Prevents the accumulation of harmful dust
Waterproof grade IPX4: liquid from any direction poured into the shell without injury
Note:
IP5X detection can choose whether with negative pressure, and IP6X the same negative pressure on the product internal pumping, resulting in negative pressure!
IPX4 simulated rain environment, 360 full rain!
IP is the abbreviation of Ingress Protection, which is the protection grade for the intrusion of foreign objects in the enclosure of electrical equipment. The source is the International Electrotechnical Commission's standard IEC 60529, which was adopted in 2004 as American National Standard.
In this standard, for the protection of foreign bodies of electrical equipment, IP-level format for the IPXX, where XX is two Arabic numerals, the first mark the number of contacts that protection and protection of foreign objects level, the second mark, said water protection level , The specific level of protection can refer to the following table.
IP is the international code used to determine the level of protection Ip level consists of two numbers, the first number that dust; the second number from the said waterproof, the greater the number of its protection, said the better head of the team.
Dust rating
Number Define the degree of protection
0 No protection No special protection
1 to prevent the intrusion of objects greater than 50mm to prevent the body due to accidentally touch the internal parts of the lamp to prevent the diameter greater than 50mm of the object intrusion
2 to prevent the intrusion of objects greater than 12mm to prevent the fingers touch the internal parts of the lamp
3 to prevent the full intrusion of more than 2.5mm objects to prevent the tool diameter greater than 2.5mm, wire or object intrusion
4 to prevent the entry of objects greater than 1.0mm to prevent mosquitoes, insects or objects greater than 1.0 diameter invasive
5 dust can not completely prevent dust intrusion, but the amount of intrusion does not affect the normal operation of the lamp
6 Dust prevention Completely prevents dust intrusion
waterproof level
Number Define the degree of protection
0 No protection No special protection
1 Prevent ingress of water by dropping water droplets that prevent vertical dropping
2 Preventing water intrusion when tilting 15 degrees When the lamp is tilted 15 degrees, dripping can be prevented
3 to prevent the water intrusion into the water to prevent rain, or into the angle of less than 50 degrees perpendicular to the direction of the water jet
4 to prevent splashing water intrusion to prevent water splashing from all directions
5 to prevent the intrusion of large waves of water to prevent large waves or water spray holes into the water rapidly
6 to prevent water intrusion into the water waves in a certain period of time or under water pressure conditions, can still ensure the normal operation of lamps
7 to prevent water intrusion into the water sinking indefinitely the water under a certain water pressure conditions, and to ensure the normal operation of lamps
8 to prevent the impact of sinking