Electrical conduit is proposed inside a 6 in. thick structural slab before the concrete pour. Which ACI dimensional limit is the key check for conduit outside diameter in that member?
Correct Answer
C) It may not exceed one-third of the slab thickness
ACI 318 limits embedded pipe or conduit outside dimension to not more than one-third the overall thickness of the slab, wall, or beam in which it is embedded; in a 6 in. slab that cap is 2 in. Other choices: material alone does not remove the limit, one-half thickness is too large, and a universal 1 in. cap is not the ACI dimensional rule.
Why This Is the Correct Answer
ACI 318 limits embedded pipe or conduit outside dimension to not more than one-third the overall thickness of the slab, wall, or beam in which it is embedded; in a 6 in. slab that cap is 2 in.
Why the Other Options Are Wrong
Option A: Assume no limit applies if the conduit is metallic
The trap in A is No limit applies if the conduit is metallic. That selection is wrong because it points to No limit applies if the conduit is metallic, but.
Option B: Assume embedded conduits may be up to one-half the slab thickness
Choice B gives It may be up to one-half the slab thickness. Its specific error: it answers the Embedded conduits prompt with the wrong practical move.
Option D: Assume embedded conduits must always be exactly 1 in. or smaller
In concrete work, It must always be exactly 1 in. or smaller is the wrong selection for Embedded conduits: It must always be exactly 1 in. or smaller is a different published number than the cited Embedded conduits value; ACI 318-19 Ch.
Memory Technique
Make embedded conduits a tabbed card: cite the exact condition, then choose It may not exceed one-third of the slab thickness.
Reference Hint
Open ACI 318-19, Building Code Requirements for Structural Concrete; use ACI 318-19 Ch. 20 embedded conduit and pipe limitations to confirm that ACI 318 limits embedded pipe or conduit outside dimension to not more than one-third the overall thickness of the slab, wall, or beam in which it is embedded; in a 6 in.
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