
Guidelines for Installing Networked Automation Systems in Buildings
7-26
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
7.7 Installing LAN Cables
7.7.1 Instructions for Installing Electrical and Optical LAN Cables
General
During installation, remember that LAN cables can only be subjected to a certain
amount of mechanical strain. Cables can be damaged or even destroyed by too
much tensile stress or pressure, by torsion or by bending them too sharply. The
following instructions will help you to avoid damage when installing LAN cables.
If cables are subjected to strain or stress as listed above, they should always be
replaced.
Storage and Transportation
During storage, transportation and cabling, the open ends of the LAN cable
(without connectors) must be kept closed with a shrink-on cover to prevent
oxidation of the cores and to keep dampness out of the cable.
Temperatures
During transportation, cabling and operation, the cable must not be exposed to
temperatures below the specified minimum temperature or above the specified
maximum temperature otherwise the electrical and mechanical characteristics of
the cables can deteriorate. The permitted temperature ranges of your LAN cable
can be found in the technical data sheets of the LAN cables in Chapters 4 and 5.
Tensile Strength
The tensile force exerted on the cables during or after installation must not exceed
the limits of tensile strength of the cables. The permitted tensile strain on your LAN
cable can be found in the technical data sheets of the bus cables in Chapters 4
and 5.
Pull Preassembled Cables Using Cable Grips
To pull preassembled cables, make sure that you use cable grips. These surround
the connector and protect it from damage when pulling in the cable.
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