Siemens SIMATIC NET SCALANCE W786 Series Operating Instructions Manual page 59

Danger from line voltage
Only electrical specialists may open the device and connect the power supply adapter.
Connect or disconnect power supply cables only when the power is turned off.
Start the SCALANCE W786 only when you have screwed down the housing cover again so that
there is once again protection against touching live parts.
NOTICE
Exceeding the EMC limit values
SCALANCE W786 with RJ-45 interface with DC power supply adapter or without power
supply adapter
When using a SCALANCE W786 with RJ-45 connector without a power supply adapter or with
a DC power adapter, no additional measures are necessary for use in a residential environment.
SCALANCE W786 with RJ-45 interface with AC power supply adapter PS791‑2AC
When using a SCALANCE W786 with a power supply adapter PS791‑2AC (100 to 240 VAC), the
requirements for use in an industrial environment are met without any additional measures
being necessary.
When used in a residential environment, noise produced by this configuration can be reduced
by fitting an EMC ferrite (a snap ferrite) to the power supply cable as close as possible to the
power supply adapter.
If you use the power supply adapter PS791-2AC (100 to 240 V AC voltage) in a domestic area
(EMC class B), fit an EMC ferrite (a snap ferrite) to the supply cable as close as possible to the
power supply adapter. This measure is unnecessary in an industrial environment.
You can order suitable ferrites from the following company:
Würth Elektronik eiSos GmbH & Co. KG
Max-Eyth-Strasse 1-3; 74638 Waldenburg, Germany
Model designation: STAR-TEC with safety lock
cable diameter 6 – 7.5 mm, article number: 74271131
cable diameter 7 – 8.5 mm, article number: 74271132
Applies only to the power supply adapter PS791-2AC (100 to 240 VAC)
Danger from line voltage
The strain relief clamp may damage the insulation under unfavorable circumstances. You run
the risk of encountering danger from line voltage through the strain relief clamp.
For a line with 100 to 240 VAC use an insulated strain relief clamp only; this ships with the
power supply adapter.
SCALANCE W786-x
Operating Instructions, 12/2021, A5E03678337-14
WARNING
WARNING
6.5 Connecting the power supply adapter
Connecting up
59