Rockwell Automation 1786-series ControlNet Fiber Media Planning and Installation Guide - Manual (Page 47)

Rockwell Automation Publication CNET-IN001C-EN-P - October 2011 47
Guidelines for Fiber-optic Installation Chapter 3
5. Maintain enough slack on the cable as the pull starts to prevent the cable
from contacting any equipment in the area.
Plan your pull to avoid a pull equaling or exceeding the total bends to 360°
per pull. If it is not possible to avoid a pull of 360°, install an intermediate
junction box within the 360° pull. Plan on manually handling the cable
along the pull route to help limit the bends.
6. Position the winch at the pull station to avoid a steep angle either entering
the duct or exiting the cable tray.
7. Leave enough extra cable to route to the equipment rack, put connectors
on, and allow for future repairs when your pull is complete.
8. Cut off the pulling grip and the first 1 m (3 ft) of cable behind it.
9. Terminate the cable.
10. Measure and record the optical cable attenuation and length by using
either an OTDR (optical time domain reflectometer) or an optical test.
11. Seal the ends of the cable with endcaps until they are terminated.
In some applications you may have to start your pull in the middle of a duct or
conduit and pull in both directions. In this scenario, pull in the first direction by
using the reel and payoff frame. In the other direction, lay out the cable in a
figure-8 pattern on the floor. When the second pull begins, hand feed the cable
into the duct system.
IMPORTANT Do not allow slack loops to form on the reel. Slack loops could
cause a crossover and damage the cable. Always pull at slow
speeds to limit the possibility of crossovers.
IMPORTANT Do not exceed the maximum pulling tension for your
fiber-optic cable.
IMPORTANT Be certain to clear the floor of dust, debris, and dirt before placing the
cable on the floor.