Rockwell Automation 1786-series ControlNet Fiber Media Planning and Installation Guide - Manual (Page 46)

46 Rockwell Automation Publication CNET-IN001C-EN-P - October 2011
Chapter 3 Guidelines for Fiber-optic Installation
Indirect Attachment
Indirect attachment uses a pulling grip attached to the cable’s outer jacket to
distribute the pulling force over the outer portion of the cable. The pulling grip
produces the least amount of stress in cables where the strength member lies
directly beneath the jacket.
Conduit and Duct Installation
Installation procedures for conduit and duct installation of fiber-optic cables are
very similar to those of electrical wires. Avoid yanking, flipping, or wrapping
cables causing unnecessary tightening. Fiber cable, electrical wires, or small
fiber-optic cables should never be subjected to foot traffic or potentially
crushing forces.
Cables should be lubricated prior to pulling to minimize the pulling forces on the
cables. Lubricants such as waxes, greases, clay slurries, and water-based gels are
compatible with most fiber-optic jacket materials. Check with the fiber
manufacture of your cable for the approved lubricants to be used on your cable.
Use this procedure for conduit or duct installation.
1. Attach the towline to the cable by using direct or indirect attachment as
described in the previous section.
2. Establish two-way communication between the cable payoff station,
intermediate hand assist stations, and the pulling station.
3. Use the following items for duct or cable tray replacements:
• Adjustable lip clutch winch or equivalent
• Tension monitoring system with continuous readout
• Tow line that assures minimum friction
• Dedicated inner duct, mainly for pulls in underground conduit
• Cable end caps for use in flooded or unknown conduits and sealing
cable ends after placement
4. Position the cable reel and payoff frame for pulling.
a. Mount the cable reel into the payoff apparatus so that the cable pays out
from the top of the reel.
b. Attach the pulling grip to the cable and position the reel with its flanges
perpendicular to the floor or support foundation.
c. Secure the payoff frame so it cannot move during pulling.