Connecting up
5
5.1
Safety when connecting up
Safety notices
When connecting up the device, keep to the safety notices listed below.
WARNING
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
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.
• The power supply unit for the device must meet NEC Class 2 according to 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
Limitation of the output voltage according to NEC Class 2 by redundancy module
To meet the requirements according to NEC Class 2, you can use a power supply with SELV along
with a power limiter, see e.g. the section "Accessories (Page 26)".
Exceptions
For the devices listed below, there are no requirements according to NEC Class 2 or LPS. For these
devices, note the conditions described in the section Supply for IRT-PRO devices (Page 64).
• X201-3P IRT PRO
• X202-2P IRT PRO
• X204IRT PRO
SCALANCE X-200
Operating Instructions, 11/2021, C79000-G8976-C284-15
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