
Guidelines for Installing Networked Automation Systems in Buildings
7-28
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
7.8 Additional Instructions on Installing Fiber-Optic Cables
Protecting Connectors from Contamination
Fiber-optic cable connectors are sensitive to contamination. Unconnected male
and female connectors must be protected with the supplied dust caps.
Attenuation Variations under Load
During installation, fiber-optic cables must not be twisted, stretched or squashed.
The specified limit values for tensile strain, bending radii and temperature ranges
must be adhered to. During installation, the attenuation values can vary slightly,
these variations are, however, reversible providing the strain limits are not
exceeded.
Pull Cables Using Cable Grips and Protect Connectors
If the cable does not have a Kevlar pulling attachment, 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.
Fitting Strain Relief
Although the BFOC connectors have their own strain relief and kink protection, it is
advisable to arrange for additional strain relief as close as possible to the
connected device to protect against mechanical strain.
Plan Adequate Attenuation Reserves
When installing cables over greater distances, it is advisable to take into account
one or more repair splices in the power loss budget.
Electromagnetic Immunity
Fiber-optic cables are immune to electromagnetic interference. Installing cables in
cable channels along with other cables (for example 230 V/380 V power supply
cables) causes no problems. When installing in cable channels, however, make
sure that the permitted strain on the fiber-optic cables is not exceeded when pulling
in other cables later.
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