What quota should be used for laying optical cables in trenches

The minimum trench depth for backfilled fiber optic cables is 36 inches (91 cm) according to Corning installation standards. The charter of the FOA was to promote professionalism in fiber optics through education, certification, and. specifications under which the various work for trenching & laying of optical fiber cable are to be executed by the Vendor. It describes excavating trenches to a nominal depth of 165cm and laying permanently lubricated HDPE ducts in the trenches. Preference will be given for Horizontal. Although the recommended practices and descriptions are all typical techniques used in South Africa - it is intended for use only as a guide and should under no circumstances be ...