Siemens SIMATIC S7-1500 System Manual page 17

Safety information
2.1 General safety information
16
Symbol Meaning
Note that a device of Protection Class III may only be supplied with a protective
low voltage according to the standard SELV/PELV.
IEC 60417-1-5180 "Class III equipment"
Be aware that the device is only approved for the industrial field and only for in-
door use.
Note that an enclosure is required for installing the device. Enclosures are con-
sidered:
Standing control cabinet
•
Serial control cabinet
•
Terminal boxes
•
Wall enclosure
•
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA