Article 1 — Description
Furnish and install conduit; prepare existing conduit.
Article 2 — Materials
Provide new materials that comply with the details shown on the plans, the requirements of this Item, and the pertinent requirements of the following Items . Item 400, “Excavation and Backfill for Structures” Item 476, “Jacking, Boring, or Tunneling Pipe or Box” When specified on the plans, provide: rigid metal conduit (RMC), polyvinyl chloride (PVC) conduit , high density polyethylene (HDPE) conduit , liquid -tight flexible metal conduit (LFMC) , or liquid -tight flexible nonmetallic conduit (LFNC). Furnish conduit from new materials in accordance with DMS -11030 , “Conduit.” Provide prequalified conduit from the Department’s MPL. When required by the Engineer, notify the Department in writing of selected materials from the MPL intended for use on each project. Provide other types of conduit not on the MPL that comply with the details shown on the plans and the NEC. Fabricate fittings such as junction boxes and expansion joints from a material like the connecting conduit, unless otherwise shown on the plans. Use watertight f ittings. Do not use set screw fittings. Steel compression fittings are permissible. When using HDPE conduit, provide fittings that are UL- listed as electrical con duit connectors , or connect conduit by thermal fus ing with an electrically heated welding method. Use red 3- in. 4-mil polyethylene underground warning tape that continuously states , “Caution Buried Electrical Line Below.”
Article 3 — Construction
Perform work as shown on the plans and in accordance with this Item . Use established industry and utility safety practices when installing conduit located near underground utilities. Consult with the appropriate utility company before beginning work.
3.1 Installation of Conduit . Install conduit at least 18 in. deep below finished grade to top of conduit unless
otherwise shown on the plans. Meet the requirements of the NEC when installing conduit. Secure and support conduit placed for concrete encasement such that the alignment will not be disturbed during placement of the concrete. Cap ends of conduit and close box openings before concrete is placed. Ream conduit to remove burrs and sharp edges. Use a standard conduit cutting die with a 3/4- in. taper per foot when conduit is threaded in the field. Galvanize or paint threads in accord ance with Item 445, “Galvanizing. ” Fasten conduit placed on structures with conduit straps or hangers as shown on the plans or 860 as directed. Fasten conduit within 3 ft. of each box or fitting and at other locations shown on the plans or as directed. Use two -hole type clamps for 2- in. diameter or larger conduit. Fit PVC and HDPE conduit terminations with bushings or bell ends. Fit metal conduit terminations with a grounding type bushing, except conduit used for duct cable casing that does not terminate in a ground box and is not exposed at any point. Conduit terminating in threaded bossed fittings does not need a bushing. Before installation of conductors or final acceptance, pull a properly sized mandrel or piston through the conduit to ensure that it is free of obstruction. Cap or plug empty conduit placed for future use. Perform trench excavation and backfilling as shown on the plans or as directed, and in accordance with Item 400. Excavation and backfilling will be subsidiary to the installation of the conduit. Jack and bore as shown on the plans or as directed, and in accordance with Item 476. Place warning tape approximately 10 in. above trenched conduit. Where existing surfacing is removed for placing conduit, repair by backfilling with material equal in composition and density to the surrounding areas and by replacing any removed surfacing, such as asphalt pavement or concrete riprap, with like material to equivalent condition. Mark conduit locations as directed.
3.2 Preparation of Conduit . Pull a mandrel through empty conduits. Use a mandrel with a diameter greater than
70% of the inside diameter of the conduit and 2-in. length. Repair or replace conduit runs that will not allow passage of the mandrel. Replace conduit deemed impractical to repair or that remains unsuitable in accordance with Item 618, “Conduit.” Clean the conduit by pulling a rubber swab slightly larger in diameter than the conduit. Blow compressed air through conduits that contain wires. Remove debris from the conduit by pushing a fish tape through the conduit. Do not use water to clear debris. Retest the conduit by blowing compressed air. Install one pull cord in each conduit for use in installing the conductors, cables, or innerduct.
Article 4 — Measurement
This Item will be measured by the foot of condui t installed, or by the foot of conduit cleared, tested, replaced, and repaired. This is a plans quantity measurement Item. The quantity to be paid is the quantity shown in the proposal, unless modified by Article 9.2., “Plans Quantity Measurement.” Additional measurements or calculations will be made if adjustments of quantities are required.
Article 5 — Payment
5.1 Installation of Conduit . The work performed and materials furnished in accordance with this Item and
measured as provided under “Measurement” will be paid for at the unit price bid for “Conduit” of the type and size specified and the installation method specified as applicable, or for “Conduit (Prepare) .” This price is full compensation for furnishing and installing conduit; cleaning and testing conduit; hanging, strapping, jacking, boring, tunneling, trenching, and furnishing and placing backfill; encasing in steel or concrete; replacing pavement structure, sod, riprap, curbs, or other surface; marking location of conduit (when required); furnishing and installing fittings, junction boxes, and expansion joints; and materials, equipment, labor, tools, and incidentals. Flexible conduit will not be paid for directly , but will be subsidiary to pertinent Items. Unless otherwise shown on the plans, no payment will be allowed under this Item for conduit used on electrical services or in foundations. Repair of existing conduit will be paid for by the Department in accordance with Article 9.7., “Payment for Extra Work and Force Account Method.”