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�I E. Installation 1. Unless otherwise noted on the Drawings, top of cabinets shall not exceed 60 inches above grade, properly aligned and adequately supported independently of the connecting raceways. ' 2. All wiring in panelboards shall be neatly formed, grouped, laced, and identified to provide a neat and orderly appearance. A typewritten directory card identifying all circuits shall be placed in the card holder inside the front cover. 1 2.05 UNDERGROUND SYSTEM A. Materials 1 . Ducts shall be polyvinyl chloride (PVC Schedule 40) installed on clean fine sand. No rocks or debris shall be allowed as trench fill. 2. Cable racks, supports, pulling -in irons, and hardware shall be galvanized steel manufactured by Cope or approved equal, or provided as required. 3. Precast P ullboxes shall be heavy duty type, designed for a Class H2O wheel load. Precast pullboxes shall be as manufactured by Brooks iProducts Co., or approved equal. ' 4. Handhole covers and frames shall be traffic rated, H2O class, provided as required and grounded to the system ground. B. Ducts shall be installed to drain away from panels; ducts between pullboxes shall drain toward the pullbox. Duct slopes shall not be less than 3 inches per 100 feet. C. Duct lines shall be laid in trenches on a clean backfill bedding. ' D. The minimum cover for duct lines shall be as specified. ' E. PVC duct terminations at pullboxes shall be with PVC and bells. F. Where bends in ducts are required, long radius elbows, sweeps and offsets shall be used. G. All ducts shall be rodded and a mandrel drawn through followed by a swab to lean out any obstructions which may cause cable abrasions. The mandrel shall be 12 inches in length and the diameter '' /2- inchless than the inside diameter of the duct. i 07/03 16050 -8 03- 4138.A