Structural · S-ZRG8Q

Conduit Placement and Additional Reinforcing Criteria in Concrete Slabs

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Embedded electrical conduits within a concrete slab must maintain strict clearances relative to slab depth, reinforcing bars, and tendons. The slab depth is divided into thirds, restricting maximum conduit outer diameter to less than one-third of the slab thickness or 1-3/4 inches, with allowable conduit zones positioned centrally. When conduits are spaced closer than four inches or three times the diameter, additional number four reinforcing bars at 12 inches on center are required at the top and bottom, extending perpendicular to the conduit for a typical minimum of 1'-0". A minimum clearance of one inch is maintained between conduits and reinforcing, with a two-inch minimum separation required from tendons. Stacking of parallel conduits is strictly prohibited, and crossing conduits must intersect at an angle no less than 45 degrees while avoiding columns and stud rails entirely.

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