Raceways Embedded in Structure Art. 812.03 SECTION 812. RACEWAYS EMBEDDED IN STRUCTURE
812.01 Description. This work shall consist of furnishing and installing rigid
conduit, fittings, and accessories embedded in concrete structures.
812.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Rigid Metal Conduit ....................................................................... 1088.01(a)
b.Rigid Nonmetallic Conduit ............................................................. 1088.01(b)
c.Expansion Fittings for Raceways ....................................................... 1088.02
d.Stainless Steel Junction Box .......................................................... 1088.04(a)
e.Fasteners and Hardware ................................................................... 1088.03 CONSTRUCTION REQUIREMENTS
812.03 Installation. Conduit embedded in a structure shall be supported on
interlocking plastic spacers specifically designed for that purpose and spaced along the length of the run as recommended by the manufacturer. Spacing between raceways within a common structure shall be not less than 2 in. (50 mm). The interlocking spacers shall be used at a maximum interval of 5 ft (1.5 m). When approved by the Engineer, the conduit may be tied to the reinforcement where the reinforcement precludes the use of the supports. Concrete cover shall not be less than 3 in. (75 mm) all around the embedded conduit run. During concrete placement, spacers and conduit joints shall stay secure and unbroken. Concrete shall be deflected during placement to minimize the possible damage to, or movement of, the conduits. All conduit joints and supports shall be inspected and approved by the Engineer before concrete is poured. Raceways shall be protected from mechanical and physical damage during construction. Open raceway ends shall be capped in accordance with manufacturer's recommendations. Raceways shall be cleared of all dirt, water, excess concrete, and other foreign materials with a dry swab and pull rope carrier. Internal obstructions shall be repaired to the satisfaction of the Engineer. The embedded conduit shall be continuous as shown on the plans, with no break or obstruction between junction boxes and through the entire raceway system. A 3/8 in. (9 mm) nylon rope shall be blown through following a pull rope carrier being pulled or blown through the conduit to demonstrate continuity between junction boxes and through the entire raceway system. The size(s) of the pull rope carrier shall be in accordance with the size(s) of the conduit as shown on the plans. The rope shall be left in the conduit, and shall be continuous between junction boxes and between all conduit terminal points. Each rope end shall be securely fitted with a washer or other approved device, of a diameter larger than the conduit diameter, to prevent the rope from coiling back inside the conduit and to ensure accessibility for the installation of cables. Art. 812.03 Junction Boxes
a.Rigid Metal Conduit. Conduit assemblies shall be prepared according to
Article 810 — 05(a).
b.Rigid Nonmetallic Conduit. Conduit assemblies shall be prepared according to Article 810.05(b).
c.Expansion Joints. Expansion joints shall be installed as follows.
1.Expansion Fittings. Expansion fittings shall be installed according to
Article 811 — 03(c)(2).
2.Liquidtight Flexible Nonmetallic Conduit (LFNC). With the approval of the Engineer, LFNC with stainless steel junction boxes may be used in lieu of an expansion fitting. The LFNC shall be installed according to
Article 811 — 03(c)(1). Stainless steel junction boxes shall be installed
according to Section 813.
812.04 Method of Measurement. This work will be measured for payment in
feet (meters) in place. Measurements will be made in a straight line along the centerline of the conduit between ends and changes in direction. Vertical conduit will be measured for payment. The vertical distance required for breakaway devices, barrier wall, concrete pedestals, etc., will be measured. Changes in direction shall assume perfect straight line runs, ignoring actual raceway sweeps. Expansion fittings or LFNC and stainless steel junction boxes will not be measured for payment.
812.05 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for CONDUIT EMBEDDED IN STRUCTURE, of the type and diameter specified. SECTION 813. JUNCTION BOXES
813.01 Description. This work shall consist of furnishing and installing a
junction box.
813.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Junction Box ...................................................................................... 1088.04
b.Electrical Raceway Materials ............................................................. 1088.01 CONSTRUCTION REQUIREMENTS
813.03 Installation. Exposed junction boxes on structures shall be installed
on 1/2 in. (13 mm) long stainless steel or brass spacers with the hinge on the side of the box and the cover lying in the vertical plane when closed. The exact orientation
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 708–709 of 1,217. View official source ↗