Article 374 covers the use and installation requirements for metal floor raceways. As noted in Sec. 374.10, "Inserts shall be leveled to the floor grade and sealed against the entrance of concrete.
Q. What is the allowable ampacity of any one of the current-carrying 12 AWG THHN insulated conductors installed in a cellular concrete floor raceway with 29 other current-carrying 12 AWG THHN ...
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