Siemens SIMATIC SFP Series Operating Instructions Manual page 10

Safety notes
If the temperature of the cable or housing socket exceeds 70 °C or the branching point of
conductors exceeds 80 °C, special precautions must be taken. If the equipment is operated
in an air ambient in excess of 50 °C to 70 °C, only use cables with a permitted operating
temperature of at least 80 °C.
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
10
WARNING
WARNING
Transceiver SFP/SFP+/SCP/STP
Operating Instructions, 12/2017, A5E02630804-11