The requirements for ampacity adjustment in metal wireways were revised in order to create a practical rule. Article 376 Metal Wireways Part II. Installation 376.22 Number of Conductors and Ampacity. (B) Conductor Ampacity Adjustment Factors. When more than 30 current-carrying conductors are installed in any cross-sectional area of the wireway, the conductor ampacity, as listed in Table 310.15(B)(16), must be adjusted in accordance with Table 310.15(B)(3)(a). Signaling and ...

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