When the trench has been set out, pilot holes needs to be dug at 25 – 30 m (80-100 feet) intervals, particularly at points where the new trench crosses existing services. The Fiber Optic Association, Inc. (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. FO-RI JOINT USE RISER. 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. This practice describes the basic guidelines for the proper sizing of handholes for use with fiber optic cable. The document is intended for personnel with prior experience in planning, engineering, or installation of fiber optic cable. Familiarity with fiber optic cable requirements, practices. specifications under which the various work for trenching & laying of optical fiber cable are to be executed by the Vendor. The broad guidelines as laid down by TEC India, for laying of OFC networks are to be followed. Preference will be given for Horiz ntal Directional Drilling (HDD) wherever. Sizes range from 12″ -12″ -12″ up to 48″ -60″ -48″.
