Siemens SIMATIC NET PROFIBUS, Owner'S Manual

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Installing LAN Cables
C-21
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
C.7 Installing LAN Cables
C.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 Chapter 4.
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 LAN cables in Chapter 4.
Pull Cables Using Cable Grips and Protect Connectors
To pull cables, make sure that you use cable grips. Before fitting the cable grip,
make sure that the connectors of preassembled cables are protected from the
pressure exerted by the cable grip, for example using a piece of protective tube.