SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
15
Important notes on using the device
Safety notices on the use of the device
The following safety notices must be adhered to when setting up and operating the device
and during all associated work such as installation, connecting up, replacing or opening the
device.
DO NOT OPEN WHEN ENERGIZED.
Safety extra low voltage (only devices with 24 VDC power supply)
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS (Limited Power Source) complying with IEC 60950-1 / EN
60950-1 / VDE 0805-1 must be connected to the power supply terminals. The power supply
unit for the equipment power supply must comply with NEC Class 2, as described by the
National Electrical Code (r) (ANSI / NFPA 70).
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
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).
For use in an environment with pollution level 2
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