Siemens SCALANCE M874-2 Operating Instructions Manual page 35

External power supply
Note
Permitted external power supplies
The power supply unit to supply the SCALANCE M-800 must comply with the requirements
for a limited power source according to IEC/EN 60950-1, section 2.5.
The external power supply for the SCALANCE M-800 must meet the requirements for NEC
class 2 circuits as specified in the National Electrical Code ® (ANSI/NFPA 70).
Refer to the section Connecting up (Page 31) and the installation instructions and
instructions for use of the manufacturer of the power supply, the battery or the accumulator.
SCALANCE M874, M876
Operating Instructions, 07/2014, C79000-G89760-C331-03
Connecting up
3.3 Power supply
35