Rockwell Automation 1786-series ControlNet Fiber Media Planning and Installation Guide - Manual (Page 45)

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 45
Guidelines for Fiber-optic Installation Chapter 3
.
Types of Fiber Media
Installations You can use fiber media in many different application types. When you plan the
application of fiber media, keep in mind the following installation types.
Pulled Application Guidelines
Pull fiber-optic cable prior to connector installation since it becomes more
difficult to protect fiber from stress after connectors have been installed.
Connectors may be pre-installed on one end, leaving the other end for pulling.
Take precautions to protect ends from damage if the cable is pre-terminated.
Refer to the manufacturer’s specifications for the fiber cable for additional
information.
You must identify the strength member and the optical fiber location within the
cable. Afterwards, a decision should be made to choose a cable pull method—pull
or indirect attachment to ensure effective pulling without fiber damage. Never
pull the cable by the fiber strand.
Direct Attachment
The cable strength member is attached directly to a pulling eye. Since epoxy glass
central strength members are too rigid to tie, they may be secured to the eye by
using tight clamping plates or screws.
Proper disposal • Always dispose of fiber waste in an approved container. Disposing
of fiber waste prevents the contamination of clothes, fingers, or
eyes of glass fragments. Do not leave pieces of fiber cable on your
work surfaces.
Specifications • Review cable specifications for distances and required connectors.
• Review all cable parameters and specifications before installation.
Make sure that you have the proper amount of connectors and
installation equipment. Never attempt to use non-compatible
connectors and installation tools.
Pulling tensions • Observe the maximum pulling tensions. Do not pull directly on fiber
or force cable into a bend radius smaller than 20 times the cable
diameter when under load and 10 times the cable diameter at no
load. This will crack the glass and result in optical loss.
• Use a running line tension meter to determine the pulling tension
applied during cable placement.
• Never allow tight loops, knots, kinks, or tight bends in the cable.
• Entrance in and out of metal pull boxes must be smooth as not to
damage the cable sheath
ATTENTION: Do not leave any fiber pieces on your work surface. The
glass is very small and can penetrate your skin easily.
Table 7 - Guidelines for Handling Fiber-optic Cable
Guideline Description