Connecting; Safety When Connecting Up - Siemens SIMATIC NET SCALANCE X-300M Compact Operating Instructions

Connecting

6.1

Safety when connecting up

Safety notices
When connecting up the device, keep to the safety notices listed below.
Power supply
The device is designed for operation with a directly connectable safety extra low voltage (SELV)
from a limited power source (LPS).
The power supply therefore needs to meet at least one of the following conditions:
• Only safety extra low voltage (SELV) with limited power source (LPS) complying with IEC
• The power supply unit for the device must meet NEC Class 2 according to the National
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
Note
A power source that supplies safety extra low voltage combined with a following NEC Class 2
power limiter also meets the requirements according to IEC 60950‑1 / EN 60950‑1 / VDE 0805‑1
or NEC Class 2. A suitable power limiter is for example the redundancy module SITOP PSE202U
NEC Class 2 (article number 6EP1962-2BA00).
Note
Safety extra-low voltage
The supply of the devices by PELV (Protective Extra Low Voltage) according to DIN VDE 0100-410
or IEC 60364-4-41 is permitted when the generated nominal voltage does not exceed the
voltage limits 25 VAC or 60 VDC.
SCALANCE X-300M
Compact Operating Instructions, 05/2023, A5E02630801-14
WARNING
60950‑1 / EN 60950‑1 / VDE 0805‑1 or IEC 62368-1 / EN 62368-1 / VDE 62368-1 may be
connected to the power supply terminals.
Electrical Code (r) (ANSI / NFPA 70).
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