Trenching is used when precise placement, multiple cables, or complex terrain requires hand or machine-dug trenches. It is slower but gives control for bedding and warning systems. Plowing is faster for long, linear rural routes; the plow opens a narrow slot and lays cable in a. 1. The methods described are intended for guideline use only, as it is impossible to cover all the various conditions that may arise during an installation. Individual. Defining Cable Routes and Access Points for Efficient Installation Define a clear cable route and access points while avoiding unnecessary detours and tight bends. Route planning should account for site conditions, building layouts, and potential future expansion to reduce rework and simplify. Underground cables are pulled in conduit that is buried underground, usually 1-1. In extreme cold climates, cables may need to be buried at greater depths where there temperatures are colder and frost penetrates to. Direct-burial fiber cable eliminates the need for continuous conduit runs and can be faster and more cost-effective on long, open runs. If an Environmental Protection Agency (EPA) Study is required, copies of the completed study with its letter of acceptance/permissi n mu h of state, co eyed by engineering and construction personnel. Representatives from each organization having. Underground construction is one of the most important processes in fiber optic cable plant construction. In particular, the "best practices" are.