Siemens SIMATIC NET SCALANCE W774-1 RJ-45 Operating Instructions Manual page 23

Grounding
Danger to life from overvoltage, fire hazard
When using outdoor antennas, the shared or even grounded pin of the circuit must be
connected to the shield of the coaxial cable and with all touchable conductive parts and
circuits. Otherwise, in the event of a fault there may be illegally high voltages on touchable
parts.
NOTICE
Damage to the device due to potential differences
To fully eliminate the influence of electromagnetic interference, the device must be
grounded. There must be no potential difference between the following parts, otherwise the
device or other connected device could be severely damaged:
• Housing of the SCALANCE W700 and the ground potential of the antenna.
• Housing of the SCALANCE W700 and the ground potential of a device connected over
• Housing of the SCALANCE W700 and the shield contact of the connected Ethernet
Connect both grounds to the same foundation earth or use an equipotential bonding cable.
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
EXPLOSION HAZARD
DO NOT OPEN WHEN ENERGIZED.
General notes on use according to ATEX and IECEx
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
SCALANCE W774-1/W734-1
Operating Instructions, 09/2015, C79000-G8976-C325-06
WARNING
Ethernet.
cable.
WARNING
WARNING
WARNING
5.1 Lightning protection, power supply and grounding
Connection
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