(1) Independently Installed: Ducts carrying communication cables and conductors for public use, when independently installed, shall be separated where practicable from gas, water, oil, or other pipe systems, by a clearance of at least 12 inches when paralleling and by at least 6. (1) Independently Installed: Ducts carrying communication cables and conductors for public use, when independently installed, shall be separated where practicable from gas, water, oil, or other pipe systems, by a clearance of at least 12 inches when paralleling and by at least 6. When installing communication cables near power service cables, proper separation must be maintained. Safety and signal integrity can be maintained by following the separation guidelines for the most common telecommunication pathway designs. They are, as you would expect, different for aerial versus undergound. Don't attach them to a. The Fiber Optic Association, Inc. The charter of the FOA was to promote professionalism in fiber optics through education, certification, and. Abstract:The design, installation, and protection of wire and cable systems in substations are covered in this guide, with the objective of minimizing cable failures and their consequences.