6.7.2
Connecting devices with 24 VDC power supply
WARNING
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, or 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.
Note
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).
Note
Safety extra-low voltage
The supply of the devices by PELV (Protective Extra Low Voltage) according to DIN VDE
0100-410 or IEC 60364-4-41 is permitted when the generated nominal voltage does not exceed
the voltage limits 25 VAC or 60 VDC.
Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
WARNING
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or combustible
atmosphere is present.
Safety notices when using the device according to Hazardous Locations (HazLoc)
If you use the device under HazLoc conditions you must also keep to the following safety
notices in addition to the general safety notices for protection against explosion:
Connecting
6.7 Power supply
SCALANCE X-300EEC
Compact Operating Instructions, 11/2019, A5E02630809-14
49
Summary of Contents for SCALANCE X-300EEC
Page 10: ...Introduction SCALANCE X 300EEC 10 Compact Operating Instructions 11 2019 A5E02630809 14 ...
Page 12: ...Safety notes SCALANCE X 300EEC 12 Compact Operating Instructions 11 2019 A5E02630809 14 ...
Page 72: ...Dimension drawings SCALANCE X 300EEC 72 Compact Operating Instructions 11 2019 A5E02630809 14 ...
Page 84: ...Index SCALANCE X 300EEC 84 Compact Operating Instructions 11 2019 A5E02630809 14 ...