Even though you place that 3 conduit in the ground it will fill with water at some time. A fiber optic cable also known as an optical fiber cable is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry light.
Protect fiber optic cable with this small diameter conduit.
Fiber optic cable conduit size. Made of 304 stainless steel it s flexible enough to weave through tight spaces but strong enough to resist over bending so it won t disrupt signals. When the conduit size is greater than 50mm 2 inches the inside radius shall be at least 10 times the internal diameter of the conduit. Pulling lubricants friction between the outer jacket of the cable and the conduit creates unwanted tension on the cable while pulling the cable through the conduit.
The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed. For tough installations use loose buffer tube fiber cables. Make sure the fibre cable has an underground rating.
Fiber cables with a maximum diameter of 1 25 4mm can be pulled in 1 25 innerduct. General guidelines of the optical cable corporation installation guide. The most popular fiber optic innerduct sizes are 1 25 4mm and 1 25 31 8mm.
For fiber optic cable the inside radius of a bend shall always be at least 10 times the internal diameter of the conduit. The general idea is that a fiber cable can fill no more than 60 70 percent of the area of an innerduct. Rated ip68 it s dust tight submersible in water for extended periods and withstands high pressure washdowns.
Failure to allow for thermal expansion can result in increased attenuation and breakage of fibers. 50 125 250 indicates a fiber with a core of 50 microns cladding of 125 microns and a coating of 250 microns. Also your fibre should be 12 18 or 24 strand more than double what you think you will ever need.
Proper cable lubrication is designed to reduce the tension on the fiber optic cable. The cable jacket needs to support direct ground contact. The size of the optical fiber is commonly referred to by the outer diameter of its core cladding and coating.
In outdoor installations a common practice of 2 5 foot sag for 150 foot span is good for thermal expansion and contraction.