372.23 Cellular Concrete Floor Raceways.

NEC Article 372 covers cellular concrete floor raceways, the hollow spaces in floors constructed of precast cellular concrete slabs, together with suitable metal fittings designed to provide access to the floor cells.
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NEC Article 372 covers cellular concrete floor raceways, the hollow spaces in floors constructed of precast cellular concrete slabs, together with suitable metal fittings designed to provide access to the floor cells.

MA amendments.

372.23. Revise this section to read as follows:

372.23 Ampacity of Conductors. The ampacity adjustment factors in 310.15(C)(1) shall not apply where 30 or fewer current-carrying conductors occupy no more than 20 percent of the interior cross-sectional area of cellular concrete floor raceways.

Click here to see the Massachusetts amendments to the 2023 NEC®.

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372.23 Cellular Concrete Floor Raceways.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true regarding Cellular Concrete Floor Raceways installed in Massachusetts?

A: The ampacity adjustment factors in 310.15(C)(1) apply when more than 30 current-carrying conductors occupy more than 20 percent of the interior cross-sectional area of cellular concrete floor raceways.
B: The ampacity adjustment factors in 310.15(C)(1) never apply.
C: The ampacity adjustment factors in 310.15(C)(1) shall apply to all conductors installed in cellular concrete floor raceways.
D: The ampacity adjustment factors in 310.15(A) shall apply to all conductors installed in cellular concrete floor raceways.
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