Connecting
5.1 Commissioning
SCALANCE XR-500
56 Operating Instructions, 05/2017, A5E03275845-11
Operation only with safety extra-low voltage
The device is designed for operation with a directly connectable safety extra-low voltage
(SELV). (This does not apply to 100 to 240 V devices).
This means that only safety extra-low voltages (SELV) complying with IEC 60950-1 / EN
60950-1 / VDE 0805-1 may be connected.
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
Suitable fusing for the power supply cables
The current on the terminal must not exceed 25 A.
Use a fuse, that protects against currents > 25 A. The fuse must meet the following
requirements:
In areas according to NEC or CEC:
• Suitable for DC (min. 60 V / 25 A)
• Breaking current at least 10 kA
• Approval according to ANSI/UL 248-1
• Suitable for the protection of DC power supply circuits
In other areas:
• Suitable for DC (min. 60 V / 25 A)
• Breaking current at least 10 kA
• Approval in compliance with IEC 60127-1 / EN 601127-1
• Breaking characteristics: B or C for circuit breakers and fuses
• Suitable for the protection of DC power supply circuits
Safety notice for connecting with a LAN ID (Local Area Network)
A LAN or LAN segment with all the interconnected devices should be contained completely
in a single low voltage power distribution in a building. The LAN is designed either for
“Environment A” according to IEEE802.3 or "Environment 0" according to IEC TR 62102.
Do not connect any electrical connectors directly to the telephone network (telephone
network voltage) or a WAN (Wide Area Network).
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