Cabling Outside Buildings; Laying Bus Cables; Installation Instructions For Electrical And Optical Bus Cables - Siemens 6GK1 901-1GB01 System Manual

3.3.7.5

Cabling outside buildings

Using fiberoptic cables
Industrial Twisted Pair is intended for use within buildings (tertiary area). The installation of
Industrial Twisted Pair cables between buildings in not permitted. LAN connections between
buildings and between buildings and external facilities are only possible with fiberoptic
cables (FO). Due to the optical transmission principle, fiberoptic cables are not affected by
electromagnetic interference. Measures for equipotential bonding and overvoltage protection
are unnecessary with fiberoptic cables.
3.3.8

Laying bus cables

3.3.8.1

Installation instructions for electrical and optical bus cables

Installation instructions for electrical and optical bus 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 shrinkon 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 bus cable can be found in the technical data sheets of
the bus cables
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 bus cable can be found
in the technical data sheets of the bus cables.
Passive network components
System Manual, 02/2013, C79000-G8976-C282-01
3.3 Guidelines for setting up networked automation systems in buildings
Installing network components in cabinets
101