Siemens SCALANCE X-300 Series Operating Instructions Manual page 121

Safety notices for use according to ATEX and IECEx
If you use the device under ATEX or IECEx conditions you must also keep to the following
safety notices in addition to the general safety notices for protection against explosion:
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
EXPLOSION HAZARD
Do not press the SELECT/SET button when there is an explosive atmosphere.
Further notes
Safety notice for connecting with a LAN ID (Local Area Network)
A LAN or LAN segment with all the interconnected devices should be contained completely in
a single low voltage power distribution in a building. The LAN is designed either for
"Environment A" according to IEEE802.3 or "Environment 0" according to IEC TR 62102.
Do not connect any electrical connectors directly to the telephone network (telephone network
voltage) or a WAN (Wide Area Network).
NOTICE
Failure of the data traffic due to contamination of optical plug-in connections
Optical sockets and plugs are sensitive to contamination of the end face. Contamination can
lead to the failure of the optical transmission network. Take the following precautions to avoid
functional impairments:
● Clean the end face of field-assembled connectors carefully before connecting. No residues
● Only remove the dust caps of optical transceivers and pre-configured cables shortly before
● Close unused optical sockets and plugs as well as pluggable transceivers and slots with
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24
WARNING
WARNING
WARNING
of processing may remain on the connector.
connecting the cables.
the supplied protective caps.
Connecting
6.1 Safety when connecting up
121