- 192 - SECTION 402 -- WIRE AND CABLE IN CONDUIT
402.01 Description
1.The Contractor shall furnish and install wire and cable of the size and type shown in the contract. This work includes the wire and cable, splices, connections, terminations, identification tags, and all labor, equipment, tools, materials, and incide ntals required to complete the work.
402.02 Material Requirements
1.Traffic signal and roadway lighting conductors in conduit shall conform to the requirements of Sectio n 1073. Conductors used as a neutral must be designated white or gray. Insulated equipment ground shall be green. Line conductors shall be designat ed red and black. Cable in duct may be used in place of wire and cable only on roadway lighting and sign lighting systems and shall conform to t he requirements of Section 1073.
402.03 Construction Methods
1.Unless indicated otherwise, all traffic signal and lighting systems shall be installed with conductors in conduit.
2.Conduits:
a.The conduit must be conti nuous, reasonably dry, completely free of debris, and without any sharp projections, edges, or short bends.
b.The Engineer may require th e Contractor to demonstrate that the conduit is reasonably dry and free of debris by pulling a swab and/or mandrel through the conduit.
3.Conductors:
a.Conductors shall be installed in conduit only after the conduit system is completed and in place.
b.The wire and cable manufacturer's recommended maximum pulling tensions shall not be exceeded. If necessary, the cables shall be adequately lubricated to reduce friction and minimize possible damage. Lubricants shall be one of several commercially available wire pulling compounds that are suitable for the cables. They shall consist of soap, talc, mica, or similar materials and shall be designed to have no deleterious effects on the cables.
c.The Contractor shall not pull wire or cable without the Engineer present. The Contractor shall give the Engineer 24 hour notice before wire or cable will be installed.
4.Pulling Cables:
a.All cables shall be neatly trained to their destinations in cabinets, pole bases, transformer bases, pu ll boxes, junction boxes, or other enclosures. The destination of all cable runs shall be clearly identified by the use of permanent, non-ferrous or plastic tags stamped or embossed with the direction of the cable run and attached to the conduit in which the cable is housed. Conductor runs shall be tagged at all intermediate points along the run such as in pull boxes, junction boxes, pole bases, and transformer bases. In instances where the conduit housing the conductor is inaccessible, such as in anchor base pole installations, the identification tag shall be attached to the conductor itself. Wire and Cable in Conduit 402.04 - 193 - b. The Contractor shall adhere to the ICEA recommended minimum values for wire and cable bending radii. These limits do not apply to conduit bends, sheaves, or other curved surfaces around which these cables may be pulled under tension while being installed. Larger radius bends are required for such conditions.
5.Where the cable enters or leaves the conduit, conduit bushings or bell ends shall be installed prior to installing cable.
402.04 Method of Measurement
1.Wire and cable shall be measured in linear feet (meters) from center to center of the pull boxes, poles, junction boxes, and controllers for each type and size shown in the contract. Cable in duct will be measured as 2 separate items, conduit and cable.
402.05 Wire and Cable in Conduit
- 194 - 402.05 -- Basis of Payment
1.Pay Item Pay Unit 2/C ____ Detector Lead-in Cable Linear Foot (LF) [Meters (m)] ____ /C ____ Traffic Signal Cable Linear Foot (LF) [Meters (m)] ____ Grounding Conductor Linear Foot (LF) [Meters (m)] ____ AWG Conductor Linear Foot (LF) [Meters (m)] ____ Pair Communication Cable Linear Foot (LF) [Meters (m)] Service Cable Linear Foot (LF) [Meters (m)] Street Lighting Cable, ______ Linear Foot (LF) [Meters (m)] Roadway Lighting Cable, _____ Linear Foot (LF) [Meters (m)] Street Lighting Cable, _____ Ba re Linear Foot (LF) [Meters (m)] Video Camera Cable Linear Foot (LF) [Meters (m)] Traffic Signal Interconnect Linear Foot (LF) Cable, Type ____ [Meters (m)] ____ Communication Cable Linear Foot (LF) [Meters (m)] Service Entrance Cable Linear Foot (LF) [Meters (m)] Optical Detector Cable Linear Foot (LF) [Meters (m)] Coaxial Cable Linear Foot (LF) [Meters (m)]
2.Payment is full compensation for all work described in this Section. - 195 - SECTION 403 -- DIRECT BURIED WIRE AND CABLE
403.01 Description
1.The Contractor shall furnish and install direct buried wire and cable of the size and type shown in the contract. This includes the wire, cable, splices, connections, termina tions, identification tags, trenching, backfilling, compacting, and all labor, equipment, tools, materials, and incidentals required to complete the work.
2.The Contractor may be requir ed to pick up and install utility supplied preducted cable. The size and type of cable, together with the pick- up location, will be shown in the contract. Installation of the cable shall be according to guidelines issued by the utility.
403.02 Material Requirements
1.Direct buried cable and conductors for traffic signal and roadway lighting shall conform to the requiremen ts of Section 1073. Cable used as a "neutral" shall be designated white or gray. Insulated equipment ground shall be green.
403.03 Construction Methods
1.The Contractor shall install the size and type of direct buried wire, cable, and preducted cable as shown in the contract.
2.The Contractor shall not trench or place cable without the Engineer present. The Contractor shall give the Engineer 24 hour notice before trenching or placing cable.
3.Trenching: a. Direct buried wire, cable, and preducted cable shall not be plow-pulled into place.
b.Cable shall be placed a minimum of 30 inches (750 mm) below ground level.
c.The bottom of the trench shall be firm and level. Sharp objects shall not protrude from the walls or the bottom of the trench.
4.Placing Cable: a. The Contractor shall place the cables alongside the trench by moving the reel rather than pulling the cable from the reel and dragging the cable along the ground. Cables shall not be kinked or damaged during this operation.
b.The cables shall be lifted se ction by section and placed in the trench in such a manner as to prevent damage to the cables.
c.Cable shall be placed in trenches without dragging or stretching.
d.All trenches shall be backfilled as soon as practicable after placing the cable. The first lift of backfill material shall be a uniform thickness of approximately 6 inches (150 mm). Ca re shall be exercised in compacting the backfill to prevent damage to the ca ble. The backfill shall be free of any material which could damage the cable. The remainder of the backfill shall be compacted to match the adjacent soil stiffness so that the trench surface will remain level with the surrounding surfaces. Six-inch wide underground
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 226–228 of 1,048.