The two most typical out of doors fiber optic cable installations are pole line aerial set up and underground cable set up. Underground cable set up can be buried immediately underground or placed into a buried duct.
Immediate burial installation:
Direct burial installations are most frequent for long cross-place installations. The cables are plowed in or buried in a trench the installation process can be quite fast. The most frequent cables used for direct burial are steel armored outside fiber cables.
Underground duct set up:
Fiber optic cables can also be pulled by means of underground ducts, which defend the cables from harsh surroundings. Underground duct set up also gives possibility for long term expansion without the need to have to dig. This is the most widespread apply in city places. Another benefit is that fiber cables without armor can be utilised which can make the installation even simpler.
Preparation prior to underground cable set up:
1. Obtain appropriate right-of-way permits
two. Determine present underground utilities this sort of as buried cables, pipes
three. Examine the soil condition in order to figure out the set up depth, whether duct ought to be utilised, the type of fiber cable must be utilized and plowing tools essential
Cable Burial strategies:
1. Plowed underneath
Plowing in a fiber cable is more quickly than trenched. But this procedure has to be meticulously monitored to prevent from harmful the cable.
two. Trenched
The fiber cable can also be trenched. This process is slower than plowing in nonetheless, it allows a a lot much more controlled cable set up. Trenches can be dug by hand or by device.
three. Directional boring
Directional boring strategy is used the place the floor can’t be worked on these kinds of as substantial, railway crossings, and so on. Rather, a dull machine is utilized to bore a a number of inches diameter gap beneath the floor, a duct is pulling via the hole and then fiber cables pulled into the duct.
Crucial variables:
one. power cord set up depth: up to 40 inches
The depth that fiber cables should be buried is decided by the soil problems and area usage. In colder places, fiber cables are normally buried below the frost line to avert the cables from becoming damaged by floor frost heaves.
2. Keep the trenches as straight as feasible
Fiber cable trenches should be straight, and the trench base need to be flat and amount. Backfill can also be utilised to distribute the cable load evenly and protect the cables.
three. Fiber cable warning labels must be buried straight over the cable
Fiber optic warning cables are typically buried immediately over the cables to warn future digging functions. Or concrete slabs can be buried beneath the warning label but previously mentioned the cables to provide even far more protection.
4. Whenever conducting armored fiber cables are utilized, they need to be effectively grounded
In direct burial installations, metal armored fiber cables are frequently decided on for their toughness and defense from rodent bites. A very critical factor to keep in thoughts is to correctly floor the cables. They ought to be grounded at all termination factors, splices and creating entrances. The cable steel armor should be linked to a floor wire using a compression-kind clamp. The cable ground wire is then bolted to a close by ground terminal strip.
5. Fiber optic cable minimum bending radius need to constantly be noticed during set up.