Safety instructions
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Safety notices on the use of the devices
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 devices or
opening the device.
Safety requirements for installation
According to the UL/CSA certification, the devices are an "open type".
To fulfill requirements for safe operation with regard to mechanical stability, flame
retardation, stability, and shock-hazard protection, the following alternative types of
installation are specified:
● Installation in a suitable cabinet.
● Installation in a suitable enclosure.
● Installation in a suitably equipped, enclosed control room.
General information
WARNING
Opening the device
DO NOT OPEN WHEN ENERGIZED.
WARNING
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).
There is an additional requirement if devices are operated with a redundant power supply:
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12
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