Siemens SIMATIC NET PROFIBUS User Manual
Page 322
Installing Network Components in Cubicles
E-2
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Degree of Protection
The various degrees of protection are shown and explained briefly in Table E–1.
For more detailed information on the individual ratings and the test conditions that
must be fulfilled, please refer to the standards listed above.
Table E-1
Degree of Protection Afforded (Brief Outline)
Code
Number
Contact and Solid Body
Protection
Water Protection
0
No protection
No protection
1
against solid bodies
≥
50 mm
diameter
dropping vertically
2
against solid bodies
≥
12 mm
diameter
dropping inclined at 15
°
3
against solid bodies
≥
2.5 mm
diameter
spray water, inclined up to 60
°
5
against solid bodies
≥
1 mm
diameter
spray water from any direction
6
dust deposits
spray water – water jet from
nozzle
7
ingress of dust (dustproof)
Heavy spray water
8
–
intermittent immersion at
specified pressure for specified
time
9
–
permanent immersion at
specified pressure for specified
time