Siemens SIMATIC NET SCALANCE W778-1 Operating Instructions Manual page 39

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.
Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or
combustible atmosphere is present.
EXPLOSION HAZARD
Do not connect or disconnect live cables to/from the device when a flammable or
combustible atmosphere is present.
SCALANCE W778-1 /W738-1
Operating Instructions, 07/2019, C79000-G8976-C450-04
WARNING
Ethernet.
cable.
WARNING
WARNING
Connection
5.1 Safety when connecting up
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