hi Mohamed,

have a look in the ET200SP system manual, chapter 14.6:

System manual

14.6 Information on insulation, protection class, degree of protection and
rated voltage

Insulation
The insulation is designed in accordance with the requirements of EN 61131-2:2007.
Pollution degree/overvoltage category according to IEC 61131
● Pollution degree 2
● Overvoltage category: II

Protection class according to IEC 61131-2:2007
The ET 200SP distributed I/O system meets protection class I and includes parts of
protection classes II and III.
The grounding of the mounting rail must meet the requirements for a functional earth FE.
Recommendation: For a configuration immune to interference, the line for the ground should
have a cross-section > 6 mm2.
The installation location (e.g. enclosure, control cabinet) must have a protective conductor
connection that meets the standard to maintain protection class I.

Degree of protection IP20
Degree of protection IP20 in accordance with IEC 60529 for all modules of the ET 200SP
distributed I/O system, which means:
● Protection against contact with standard probes
● Protection against foreign objects with diameters in excess of 12.5 mm
● No protection against water

You will find the manual here:

SIMATIC ET 200SP Manual Collection

hope this helps,

regards,