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CTA Project No. 19-0035-001-01 16110-8 Golden Shores Street Lighting <br />October 12, 2020 SIB Bid No. 20-09-01 <br />3.10 TERMINATION AT ENCLOSURES <br />A. Cast Metal Enclosure: Provide manufacturer's premolded insulati ng sleeve inside <br />metallic conduit terminating in threaded hubs. <br />B. Sheet Metal Boxes, Cabinets, and Enclosures: <br />1. Rigid Galvanized Conduit: <br />a. Provide one lock nut each on inside and outside of enclosure. <br />b. Install grounding bushing. <br />c. Provide bonding jumper from grounding bushing to equipment ground bus or <br />ground pad; if neither ground bus nor pad exists, connect jumper to lag bolt <br />attached to metal enclosure. <br />d. Install insulated bushing on ends of conduit where grounding is not required. <br />e. Provide insulated throat when conduit terminates in sheet metal boxes having <br />threaded hubs. <br />2. PVC Schedule 40 Conduit: Provide PVC terminal adapter with lock nut. <br />C. Free-Standing Enclosures: Terminate conduit entering bottom with grounding bushing; <br />provide a grounding jumper extending to equipment ground bus or grounding pad. <br />3.11 UNDERGROUND RACEWAYS <br />A. Grade: Maintain minimum grade of 4 inches in 100 feet, either from one manhole, <br />handhole, or pull box to the next, or from a high point between them, dependin g on <br />surface contour. <br />B. Cover: Maintain minimum 2-foot cover above conduit and concrete encasement, unless <br />otherwise shown. <br />C. Make routing changes as necessary to avoid obstructions or conflicts. <br />D. Couplings: In multiple conduit runs, stagger so that couplings in adjacent runs are not in <br />same transverse line. <br />E. Union type fittings not permitted. <br />F. Spacers: <br />. Provide preformed, nonmetallic spacers, designed for such purpose, to secure and <br />separate parallel conduit runs in a trench or concrete encasement. <br />2. Install at intervals not greater than that specified in NFPA 70 for support of the type <br />conduit used, but in no case greater than 10 feet. <br />G. Support conduit so as to prevent bending or displacement during backfilling or concrete <br />placement. <br />H. Installation with Other Piping Systems: <br />1. Crossings: Maintain minimum 12-inch vertical separation. <br />2. Parallel Runs: Maintain minimum 12 -inch separation. <br />3. Installation over valves or couplings not permitted. <br />