Art. 810.05 Exposed Raceways raceways within a common duct bank shall be a minimum of 2 in. (50 mm). The interlocking spacers shall be used at a maximum interval of 5 ft (1.5 m). Concrete cover overall shall be a minimum of 3 in. (75 mm) all around the encased run. During concrete placement there shall be no voids, the spacers shall be undisturbed, and the conduit joints shall stay secure and unbroken. Concrete shall be deflected during placement to minimize the possible damage to or movement of the conduits. Conduit encased in concrete shall have steel reinforcing when installed below roadway or other paved vehicle areas (including shoulder) and the reinforcement shall extend a minimum of 5 ft (1.5 m) additional from the edge of pavement. Steel reinforcement shall be a minimum of No. 4 (No. 15) bars at corners and otherwise spaced on 12 in. (300 mm) centers, tied with No. 4 (No. 15) bars on 12 in. (300 mm) centers. All conduit joints and supports shall be inspected and approved by the Engineer before concrete is poured.
810.06 Method of Measurement. This work will be measured for payment in
feet (meters) in place. Measurements will be made in straight lines 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., and the depth of any burial will be measured. Changes in direction shall assume perfect straight line runs, ignoring actual raceway sweeps.
810.07 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for UNDERGROUND CONDUIT, of the type and size specified. Conduit encased in concrete will be paid for at the contract unit price per foot (meter) for CONDUIT ENCASED, of the type, diameter, and number of raceways wide by the number of raceways high specified. Reinforcement bars will not be paid for separately. SECTION 811. EXPOSED RACEWAYS
811.01 Description. This work shall consist of furnishing and installing
raceways, fittings, and accessories attached to supports.
811.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Rigid Metal Conduit ....................................................................... 1088.01(a)
b.Expansion Fittings for Raceways ....................................................... 1088.02
c.Stainless Steel Junction Box ......................................................... 1088.04(a)
d.Fasteners and Hardware ................................................................... 1088.03 CONSTRUCTION REQUIREMENTS Exposed Raceways Art. 811.03
811.03 Installation. Installation of exposed raceways shall be as follows.
a.Rigid Metal Conduit. Rigid metal conduit installation shall be according to
Article 810 — 05(a). Conduits terminating in junction and pull boxes shall be
terminated with hubs, integral box hubs, or integral box bosses and shall include insulated bushings. Supports. Surface-mounted conduits shall be held in place by one-hole clamps and clamp backs. Conduits mounted to steel beams or columns shall be held in place by suitable beam clamps. Clamps, clamp backs, and beam clamps shall be hot-dip galvanized steel or stainless steel. Raceways suspended from the structure shall be supported by trapeze or other hangers approved by the Engineer. Trapeze hangers shall be hot-dip galvanized steel channels or angle irons with conduits held in place by stainless steel U-bolts, nuts, and lock washers. Trapeze hangers shall be hung using threaded hot-dip galvanized or stainless steel rods not less than 1/2 in. (13 mm) diameter and appropriate anchors or by other means approved by the Engineer. Raceway supports shall be installed with a support within 3 ft (900 mm) of each cabinet, box, or fitting, except the maximum distance between supports shall be as indicated below. Conduit Supports Maximum Distance Conduit Diameter Between Rigid Metal Conduit Supports in. (mm) ft (m) 1/2-3/4 (13-20) 5 (1.5) 1 (25) 6 (1.8) 1 1/4-1 1/2 (30-40) 7 (2.1) 2-2 1/2 (50-65) 8 (2.4) 3 and larger (75) 10 (3)
b.Coated Galvanized Steel Conduit. In addition to the methods described in
Article 810 — 05(a) the following methods shall be observed when installing
coated conduit. Coated conduit pipe vise jaw adapters shall be used when the conduit is being clamped to avoid damaging the coating. Coated conduit shall be cut with a roller cutter or by other means approved by the conduit manufacturer. After any cutting or threading operations are completed, the bare steel shall be touched up with the conduit manufacturer’s touch up compound. Art. 811.03 Exposed Raceways
c.Expansion Joints. Expansion joints shall be installed as follows.
1.Liquidtight Flexible Nonmetallic Conduit (LFNC). LFNC shall not be used in lieu of bending conduit. LFNC shall only be used to isolate structure to structure movement or to isolate vibration as shown on the plans. LFNC shall not exceed 6 ft (1.8 m) in length unless approved by the Engineer. LFNC shall terminate in a stainless steel junction box installed according to Section 813. Fittings designed for use with LFNC shall be used at all connections.
2.Expansion Fittings. The fittings shall be precisely aligned with the conduit run to ensure proper expansion and deflection operation and prevent binding. Careful attention to joint movement over a range of temperatures shall be coordinated with the selection and installation of the coupling to ensure the range of movement of the coupling is not exceeded at temperature extremes. For vertical conduit runs, the fitting shall be installed close to the top of the structure to prevent water running across the fitting and entering the conduit. The fitting’s deflection sleeve coupling, and pressure bushing at the barrel of the expansion body, shall be installed flush with the structure ends so that only the connecting expansion nipple crosses the opening between structures. The fitting shall be supported by points on the conduit immediately adjacent to the fitting. The fitting shall have an external bonding jumper.
811.04 Method of Measurement. This work will be measured for payment in
feet (meters) in place. Measurements will be made in straight lines along the centerline of the conduit between ends and changes in direction. 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.
811.05 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for CONDUIT ATTACHED TO STRUCTURE, of the type and diameter specified. 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.
Referenced in this section
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 705–708 of 1,217. View official source ↗