Connecting up
6.1 Lightning protection, power supply, and grounding
SCALANCE W786 outdoor access point
36
Operating Instructions, 06/2013, A5E02280428-08
Note
48 V lightning protector
When using the 48 V DC lightning protector, the power supply must be fused with 1 A.
Safety extra low voltage
WARNING
Danger to life from overvoltage, fire hazard
The equipment is designed for operation with Safety Extra Low Voltage, SELV by a Limited
Power Source, LPS. (This does not apply to 100 V ... 240 V devices.)
This means that only Safety Extra Low Voltage (SELV) with Limited Power Source, LPS
complying with EN60950 / EN 60950-1 / VDE0805 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).
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
Exception:
Power supply with PELV (according to VDE 0100-410 or IEC 60364-4-41) is also possible if
the generated rated voltage does not exceed the voltage limits 25 V AC or 60 V DC.
WARNING
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
Redundant power supply
NOTICE
Setup with redundant power supply (Power over Et 24 V DC or 48 V DC)
To use a redundant 24 V power supply (or 48 V with SCALANCE W786) and Power over
Ethernet (PoE), a separate floating 24 V source (or 48 V source for W786) must be
available for each SCALANCE W-700. Otherwise there is no longer isolation of the input
voltages of different devices required for the PoE function and functionality may be
disturbed.
