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Connecting up
5.1 Safety when connecting up
Power supply
The device 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
• The power supply unit for the device must meet NEC Class 2 according to the National
If the device is connected to a redundant power supply (two separate power supplies), both
must meet these requirements.
Note
Protective ground
A PELV circuit contains a connection to protective ground. Without a connection to protective
ground, or in case there is a fault in the connection to the protective ground, the voltage for the
circuit is not stabilized.
Note
Minimum temperature rating of the cable to be connected to the field wiring terminals, 90 °C.
Safety notices for operation with a power supply not complying with NEC Class 2
If you operate the device in a control cabinet, you can use a power supply that does not comply
with NEC Class 2. When connecting up the device, keep to the safety notices listed below.
Safety extra low voltage
The device is designed for operation with a directly connectable safety extra-low voltage (SELV)
according to UL/IEC 61010-1 and UL/IEC 61010-2-201 whose output power corresponds to
"Limited Energy" according to UL/IEC 61010-1.
40
WARNING
62368-1 / EN 62368-1 / VDE 62368-1 can be connected to the power supply terminals.
Electrical Code (r) (ANSI / NFPA 70).
WARNING
Operating Instructions, 02/2023, C79000-G8976-C628-05
SCALANCE MUM856-1
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