Siemens SIMATIC NET SCALANCE W774-1 Operating Instructions Manual page 46

Connection
6.1 Safety when connecting up
Danger due to lightning strikes
Installing this lightning protector between an antenna and a SCALANCE W device is not
adequate protection against a lightning strike. The LP798-1N lightening protector only
works within the framework of a comprehensive lightning protection concept. If you
have questions, ask a qualified specialist company.
Note
The requirements of EN61000-4-5, surge immunity tests on power supply lines, are met
only when a Blitzductor is used with 24 VDC:
BVT AVD 24
article number: 918 422
Manufacturer: DEHN+SÖHNE GmbH+Co.KG, Hans Dehn Str. 1, Postfach 1640, D -
92306 Neumarkt, Germany
Supply voltage
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
• The power supply unit for the device must meet NEC Class 2 according to the
If the equipment is connected to a redundant power supply (two separate power
supplies), both must meet these requirements.
Grounding
Danger to life from overvoltage, fire hazard
When using outdoor antennas, the shared or grounded pin of the circuit must be
connected to the shield of the coaxial cable and to all touchable conductive parts and
circuits. Otherwise, there may be impermissibly high voltages on touchable parts in the
event of a fault.
46
WARNING
WARNING
with IEC 62368-1 / EN 62368-1 / VDE 62368-1 may be connected to the power
supply terminals.
National Electrical Code (r) (ANSI / NFPA 70).
WARNING
SCALANCE W774-1 / W734-1
Operating Instructions, 03/2022, C79000-G8976-C325-15