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Connecting up
Safety notices for operation with a power supply according to NEC Class 2
Operate the device with a power supply according to NEC Class 2. 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.
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.
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.
40
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).
WARNING
Operating Instructions, 08/2021, C79000-G8976-C628-02
SCALANCE MUM856-1
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