Siemens SINAUT ST7 System Manual page 182

Installing and putting a SINAUT modem into operation
5.2 Important notes on using the device
General notices
Safety extra low voltage
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS 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.
Opening the device
DO NOT OPEN WHEN ENERGIZED.
The following notices relate to the following modules:
● MD720-3
● MD740-1
● MD741-1
Please note the following notices when using these modules in a hazardous location.
General notices on use in hazardous areas
Risk of explosion when connecting or disconnecting the device
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
Replacing components
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
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WARNING
WARNING
WARNING
WARNING
System Manual, 07/2009, C79000-G8976-C178-07
Station control system