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Connecting up
6.1 Lightning protection, power supply and grounding
Note
The requirements of EN61000-4-5, surge immunity tests on power supply lines, are met only
when a Blitzductor is used with 12 to 24 VDC:
BVT AVD 24
type no. 918 422
Manufacturer: DEHN+SÖHNE GmbH+Co.KG, Hans Dehn Str. 1, Postfach 1640, D -
92306 Neumarkt, Germany
Safety extra low voltage
Danger to life from overvoltage, fire hazard
SCALANCE W700 devices are designed for operation with a directly connectable safety
extra-low voltage or with the power supply adapters available as accessories (available
only for the SCALANCE W786 device). Therefore only safety extra-low voltage (SELV) with
limited power source (LPS) complying with IEC950/EN60950/VDE0805 may be connected
to the power supply terminals (exception: Power supply adapter for 100 - 240 VAC for the
SCALANCE W786).
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).
The power supply unit to supply the SCALANCE W700 must comply with NEC Class 2
(requirements of class 2 for power supply units of the "National Electrical Code, table 11
(b)") or SELV with LPS (Limited Power Source) EN 60950-1. If the power supply is
designed redundantly (two separate power supplies), both power supplies 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 VAC or 60 VDC.
34
WARNING
Operating Instructions, 11/2014, A5E03678337-07
SCALANCE W786-x
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