Monday, August 2, 2010

What is a Fiber Optic Pulling Eye?

Fiber optic pulling eye is also called cable pulling eye. It is a device that is fastened to a fiber cable. The hook can then be attached to the fiber pulling eye to pull the fiber cable through a innerduct, duct or small space.

Alternatively, it is possible to simply tie the pulling rope to the strength member in a fiber cable. This is enough for very simple pulls with very low resistance. But for conduit runs, this is a dangerous practice since the knot may catch along the path and fiber may be broken.
 
The cable pulling eye approach is a common and recommended practice for most fiber pulling jobs. Here are the general steps with this method.
 
1. Strip the cable to expose about 15cm of cable strength member only
2. Cover the strength members with epoxy glue
3. Fill the pipe section of a pulling eye with epoxy glue and fit it to the strength member. Allow the epoxy to set before starting pulling
4. Cover the end of the fiber cable with tape to ease the transition between strength member and cable. This protects the fiber cable and also stops ingress of dirt or water
5. For long cable runs, use intermediate pulling points where the cable is pulled through and coiled up in a figure "8" pattern on the ground and then fed into the next conduit section
6. At intermediate pulling points, reapply cable pulling lubricant to the cable before pulling through the next conduit section
 
Another popular method of attaching a pulling rope to a fiber optic cable is the "Chinese Basket" or "Kellems Grip". This is most effective with larger diameter cables.

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