Core TradesCâu 19 / 700
When 7 current-carrying conductors are bundled together in a single raceway, their allowable ampacity must be adjusted to what percent of the base value?
a.100 percent
b.90 percent
c.80 percent
d.70 percent
Giải thích
For 7 through 9 current-carrying conductors the adjustment factor is 70 percent, because heat cannot dissipate as readily when many conductors share a raceway. 100, 90, and 80 percent apply to fewer conductors (3 or fewer, 4 to 6, respectively).
Trích dẫn luật: 2025 CA Electrical Code (CEC) §310.15 (Conductor Ampacity)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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