Illinois Department of Transportation (IDOT) · Standard Specifications for Road and Bridge Construction
Section 811 — EXPOSED RACEWAYS
Illinois Standard Specifications for Road and Bridge Construction, Section 811. Full text, cross-references and related pay items on BuildSpec.
Art. 810.05 Exposed Raceways 688 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…
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