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r rr When backfilling trenches in existing pavement, use a commercially available sand-cement (approximately 10 : 1 mix ratio). Provide a standard clearance between underground control cable and electrical r service cable or another parallel underground electrical service cable that meets National Electrical Safety Code requirements. 630-3 . 1 . 1 Fiber Optic Cable Conduit: Prevent the ingress of water, dirt, sand, and other foreign materials into the conduit prior to, during and after construction. Exclude water and debris from buried conduit and from the top riser assembly of aboveground conduit using a foam-sealing material, rubber plug, or other device designed for this application and approved by ` the Engineer. Use a UV-rated flexible conduit to protect the cable from the top of the conduit riser to the span messenger where the cable is to be lashed. Ensure that the conduit fill ratio (outer cable diameter to inner conduit/duct diameter) does not exceed 50% . Install the conduit system so the fiber optic cable maintains a minimum bend radius of 20 times the cable diameter. Install the conduit as shown in the plans. Provide all fittings and incidental materials necessary to construct a complete installation. Use approved methods for connecting r inner duct or conduit within or between plowed portions, trenched portions, and bored portions. Submit the conduit manufacturer' s coupling method and material to the Department' s Project Manager for approval. aw 630-3.1.2 Fiber Optic Cable Locate Wire: Bury locate wire along the centerline of the top outer surface of installed conduit, as shown in the plans, or as directed by the Engineer. Install locate wire in the trench or bore with all underground conduits to provide r end-to-end electrical continuity for electronically locating the underground conduit system. Do not install locate wire in a conduit with fiber optic cable. Do not run locate wires into field cabinets. Terminate locate wires at the r first and last pull boxes in the conduit run or as shown in the plans. Ensure that wire termination occurs only at the top of a pull box. In a trenching operation, install the locate wire no more than 3 inches above the conduit. Ensure that the locate wire enters all pull boxes and splice boxes, and that a minimum of 10 feet of slack locate wire is coiled and neatly stored in each box. In a boring operation, install the locate wire in an encasement. Drill a hole in the pull box or splice box for wire entry as shown in the plans. Fill any gaps between the locate wire and the hole it passes through with nonshrink grout or a similar sealant suitable for the application and approved by the Engineer. Perform continuity tests and insulation resistance tests on all locate wires . Provide the Engineer with all test results. Replace or repair defective locate wire at no additional cost. Make locate wire splices in a flush grade-level box. Ensure that locate wire splices are waterproof and suitable for direct burial. Ensure that locate wire splices at the pull box meet NEC requirements. Ensure that locate wire splices include a mechanical crimp connection with a butt sleeve, an oxide-preventing aerosol lacquer, mastic electrical splicing tape, and standard electrical tape using methods and materials approved by the Engineer. At the �. completion of the installation, provide the Engineer with as-built drawings that document all splice locations. r r