2023-193 - Laserfiche WebLink

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Perform the cable pulling operation in such a manner that the minimum -bending radius of the cable shall not be exceeded in the unreeling and pulling operations. Use entry guide chutes to guide the cable into the pull -box conduit ports. Utilize lubricating compound to minimize cable -to -conduit friction. Lubricating compound shall be a water-based compound specifically produced for fiber optic cable lubrication. Lubricants such as dish soap and other substitutes are not allowed. Corner rollers (wheels), if used, shall not have radii less than the minimum installation bend radius of the cable. A series array of smaller wheels can be used for accomplishing the bend, if the cable manufacturer specifically approves the array. Continuously measure the cable pulling tension; the pulling process shall not be allowed to exceed the maximum tension specified by the manufacturer of the cable. Fuse links and breaks shall be used to insure during the pulling process the cable will not be subjected to pulling stresses exceeding exceed 2700 N (600 lbs.). When simultaneously pulling fiber optic cable with other cables, separate grooved rollers shall be used for each cable. The Contractor is permitted to use air -assisted blowing for the fiber optic cable installation within the conduit. Air -assisted blowing may consist of either the high air speed blowing (HASB) method or the piston method. While using the HASB method, the volume of air passing through the conduit shall not exceed 600 cfm or the air pressure stipulated by the conduit manufacturer. In using the piston method, the volume of air passing through the conduit shall not exceed 300 cfm or the conduit manufacturer's recommended air volume, whichever is more restrictive. The Contractor shall insure that the fiber optic cable procured for this project, is flexible and approved by the cable manufacturer for air -assisted blowing installation methods. The Contractor shall also be responsible for ensuring that the type of conduit procured for this project, does not have physical characteristics that would disrupt the flow of air needed for proper cable installation (e.g. circumferential ribs or corrugations). The conduit shall be able to hold up to 100 Psi of air without leaks. Conduit splices are critical and shall not reduce the interior diameter of the conduit. Aluminum couplers, suitable for air -assisted blowing of fiber optic cable, shall be used for both HASB and piston method cable installations. A factory furnished lubrication, especially engineered for blowing methods of cable installation, shall be used, and regular cable -pulling lubricants shall not be permitted for air -assisted blowing installation methods. Fiber optic simplex duct plugs used with air -assisted blowing installations, shall require seals sized to the cable in order to prevent leakage from the pressure chamber around the entering cable. General field procedures for air -assisted blowing installations of fiber optic cable shall be as follows: Ensure that the conduit system is properly installed with pressure -tight conduit splices. Test the conduit system prior to cable installation by sealing one end of the conduit and pressurizing the conduit using a sealed blowing machine. The conduit should not lose air pressure at any significant rate as determined by the Owner. If using the HASB method, cap the front end of the cable to prevent it from hanging up in the conduit. Use air seals that fit properly around the outside diameter of the cable being installed. Clean, dry, and establish the airtight integrity of the conduit, by blowing a hard mandrel through the conduit to establish that the conduit is not crushed. Blow a tight -fitting foam carrier through the conduit at high pressure. The foam carrier should travel through at approximately 100 fps in a clean conduit. If excess water or dirt comes from the conduit, repeat the process. At the Owner's discretion, dry the conduit with dry airflow prior to cable installation. 31