Lightning protection measures for optical cable lines must follow the design regulations. Underground cables are pulled in conduit that is buried underground, usually 1-1. 2 meters (3-4 feet) deep to reduce the likelihood of accidentally being dug up. In extreme cold climates, cables may need to be buried at greater depths where there temperatures are colder and frost penetrates to. In an existing infrastructure where there is new requirement for Fiber Optic Network, ODASCO offers a very unique Solution for installing Fiber Optic cable in the existing sewer& Water Surface Drains. During installation, all curvatures should be smooth. (FOA) was founded in 1995 to help develop the workforce to build the fiber optic networks to support a rapid expansion in communications and the Internet. FO-VC2 JOINT USE - VERICAL MIDSPAN CLEARANCES 48.