Fiber ducts are usually made of HDPE (high density polyethylence), PVC or other compound. They are usually in black or gray. Fiber innerduct is usually orange or yellow.
Why usually fiber ducts and innerducts are corrugated?
Fiber ducts and innerducts are corrugated to provide the following benefits:
1. During the installation to reduce the traction tension;
2. Very flexible and can be used to install location involves many times;
3. After installation, corrugated innerduct should place one day allow innerduct retreat back into the duct through its waveform spring action.
The use of pulling tape
Fiber optic cable traction tape is pre-installed in the fiber duct and innerduct in the factory. This saves a lot of time during the installation process. Duct and innerduct can also be prelubricated in the factory, thus significantly reduces pulling tensions.
Never bend over its minimum bend radius
Like a fiber optic cable, fiber duct and innerduct also have a minimum bending radius specification. Always should be bent pipe or innerduct tightening than its minimum bending radius.
What is supported and unsupported radius?
The supported radius is the minimum bend radius when the duct is bent around a supporting structure such as in another duct or on a reel. The unsupported radius is the minimum bend radius when the duct has no supporting structure in the bend.
Benefits of using fiber duct and innerduct
Fiber duct- Fiber duct protects the fiber cables and also provides an opportunity for future cable access and expansion. Fiber optic cable can be pulling into existing duct. The duct should usually be oversized to allow future cables be pulled in.
Fiber innerduct- Fiber innerduct of fiber optic cable to provide protection from the other company of cable installation. It also provides additional protection of the environment. Innerduct or fiber can be used in the old pipe installation.
Things to keep in mind
1. Install the end plug
After the fiber optical cable is installed into a duct or innerduct, end plugs should be installed to provide a water seal. No pieces should be able to enter the duct or innerduct, and watertight should always be maintained for the duct or innerduct.
2. Duct and innerduct should be properly sized for future expansion possibility
As usual, the expansion of the plan for the future project is crucial to the success of the real. The ration of up to 40% is a good practice to fill the following. Should increase the length of pipe size is the length of installed with many times. A larger pipe can help reduce the tension in the cable drawing. 3 to 8 inches standard pipe sizes in different ID and innerduct size range from 0.75 to 2 inches.
The benefit of using duct lubricant
Duct lubricant can significantly reduce the cable’s coefficient of friction, thus lessening the pulling tension during cable pulling process. This is especially important in long duct cable pulls with many turns.
Duct lubricant spillage should be cleaned up as soon as possible to prevent accident since it is very slippery. Manufactures’ recommended procedure for cleaning lubricant provides good instruction on how to do the cleaning.