Connecting up
6.1 Safety when connecting up
SCALANCE W788-x / W748-1
Operating Instructions, 03/2022, A5E03678333-17
49
WARNING
It must be ensured that the transient protection is set to a value which does not exceed
140% of the rated peak voltage value and 119 V at the supply terminals of the device.
Operate the devices only with SELV (safety extra low voltage).
Grounding
WARNING
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.
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 W device and the ground potential of the antenna.
• Housing of the SCALANCE W device and the ground potential of a device connected
over Ethernet.
• Housing of the SCALANCE W device and the shield contact of the connected
Ethernet cable.
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
WARNING
Do not connect or disconnect cables to or from the device when a flammable or
combustible atmosphere is present.
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