Siemens Simatic S7-300 - Notes on Use in Hazardous Areas According to UL Hazloc; FM

Installation, connection, commissioning, removal
5.1 Important notes on using the device
CP 343-1 Lean
34 Equipment Manual, 01/2023, C79000−G8976−C198−09
WARNING
Suitable cables at high ambient temperatures in hazardous area
Use heat-resistant cables with an ambient temperature ≥ 60 °C; these cables must be rated
for an ambient temperature that is at least 20 °C higher. The cable entries used on the
housing must comply with the IP degree of protection required by EN IEC 60079-0 /
GB 3836.1.
WARNING
Transient overvoltages
Take measures to prevent transient overvoltages of more than 40% of the rated voltage (or
more than 119 V). This is the case if you only operate devices with SELV (safety extra-low
voltage).
5.1.3 Notes on use in hazardous areas according to UL HazLoc / FM
This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or non-
hazardous locations only.
This equipment is suitable for use in Class I, Zone 2, Group IIC or non-hazardous locations
only.
WARNING
EXPLOSION HAZARD
Replacing components may impair suitability for Class 1, Division 2 or Zone 2.
WARNING
When used in hazardous environments corresponding to Class I, Division 2 or Class I, Zone
2, the device must be installed in a cabinet or a suitable enclosure.
WARNING
If the device is installed in a cabinet, the inner temperature of the cabinet corresponds to
the ambient temperature of the device.