NV-600LI/RI Managed Industrial Grade VDSL2 CO/CPE Router USER’S MANUAL Ver. A4
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Appendix D:
IP-30 protection of metal case
The term “protection class” generally indicates the type of protection of a device or the internal workings of a device against direct
contact and against the infiltration of foreign bodies, such as objects, dust or water.
The resistance to stress arising from prevailing working conditions is defined using international protection (IP) classes. These
protection classes are, in turn, indicated in IP standards (DIN EN 60529), whereby a combination of two digits specifies the level of
protection. The first digit indicates the level of resistance to foreign bodies and dust, the second digit the level of resistance to water
infiltration. A higher value of the relevant digit (first digit 0 – 6, second digit 0 - 8) indicates a higher level of protection.
The table on the following offers clarity and an overview of the IP rules:
Table D-1
First Digit:
Protection grades for contact and foreign matter protection.
Digit
Designation
Explanation
0
No protection
No special protection to prevent infiltration by solid objects.
1
Protection against large foreign matter Protection against solid objects greater than 50 millimeters in diameter.
2
Protection against mediumsized
Foreign matter
Protection against solid objects greater than 12.5 millimeters in diameter.
3
Protection against small foreign matter Protection against solid objects greater than 2.5 millimeters in diameter.
4
Protection against circular foreign
matter
Protection against solid objects greater than 1 millimeter in diameter.
5
Dust protected
Complete protection against dust is not necessary, but infiltration must be
prevented to a sufficiently high degree to ensure that the functioning and safety of
the device are not impaired.
6
Dustproof
Complete protection against dust infiltration
