Fiber optic innerducts are smooth wall or corrugated tubes made with HDPE (outdoors plant OSP), PVDF or PVC (indoor functions).
Innerduct is used in functions the place several fiber cables must be protected. The corrugated construction allows innerduct to simply bend at a fairly massive radius without collapsing the interior. It also gives mechanical protection against crushing.
Fibers are deployed through fiber innerducts which in turn are drawn by means of conduit laid in the bottom. Innerducts can subdivide each section of the bigger duct.
100mm diameter conduits are the most well-liked. As a rule of thumb, 2four 4 pcs of 1(25.4mm) innerduct can be pulled by means of a 100mm conduit.
The most popular fiber optic innerduct sizes are 1(25.4mm) and 1.25(31.8mm). Fiber cables with a most diameter of 1(25.4mm) will be pulled in 1.25innerduct. The final thought is that a fiber cable can fill no more than 60~70 % of the realm of an innerduct.
Multiple cables could be pulled at once, as long as the tensile load is applied equally to all cables.
If future cable pulls in the same duct or conduit are a chance, fiber optic innerduct should all the time be used. With out it, future fiber cable pulls can entangle existing working fiber cables and trigger service interruption.
Innerduct ought to be installed as straight as doable since twists can increase cable pulling tension which in turn can cause reliability problem.
Fiber cable filling ratios requires that top fiber counts in prediction of future wants. On cable jacket will be more densely filled with fibers than a number of cable jackets. The cost of additional fibers is usually small when these additional fibers are not terminated until wanted.
An innerduct may also be used in a cable tray to isolate fibers from copper cables.
As with all cabling parts, innerduct should meet all the right scores to be positioned in plenum area.