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Distance between communication optical cables and gas pipelines
(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. 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. to n utral comm. cable R The clearance between duct systems of communication lines for public use and other underground structures independently installed shall be as great as practicable. FO-VC2 JOINT USE - VERICAL MIDSPAN CLEARANCES 48.
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Fiber Optic Gas Sensor PCF
A novel design of circular photonic crystal fiber (C-PCF) gas sensor is presented and analyzed by full vectorial finite element method. The suggested structure has a spiral porous Core region to achieve high light i.