Connection
6
6.1 Safety when connecting up
Saf
ety notices
When connecting up the device, keep to the safety notices listed below.
Note
S
train relief for the Ethernet cables
In order to avoid mechanical stress on the Ethernet cables and resulting interruption of the
contact, fasten the cables at a short distance from the connector using a cable guide or busbar.
Safety notices for operation with a power supply according to NEC Class 2
Oper
ate the device with a power supply according to NEC Class 2. When connecting up the
device, keep to the safety notices listed below.
WARNING
Power supply
The de
vice is designed for operation with Safety Extra-Low Voltage (SELV) that can be
connected directly by 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
62368-1 / EN 62368-1 / VDE 62368-1 can be connected to the power supply terminals.
• The power supply unit for the device must meet NEC Class2 according to the National
Electrical Code (r) (ANSI / NFPA70).
If the device is connected to a redundant power supply (two separate power supplies), both
must meet these requirements.
WARNING
Insulation of external power supplies
Ext.
circuits intended to be connected to this device shall be galv. separated from hazardous live
voltage by reinforced or double insulation.
SCALANCE MUM853-1
Operating Instructions, 03/2023, C79000-G8976-C650-05 45
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