Core TradesCâu 184 / 700
Ampacity derating (adjustment) for bundled conductors generally begins to apply once a raceway or cable contains MORE than how many current-carrying conductors?
a.Two
b.Three
c.Six
d.Nine
Giải thích
Adjustment factors apply when more than three current-carrying conductors share a raceway or cable, because bundled conductors cannot shed heat as easily. Two or three conductors do not trigger derating, and waiting until six or nine would allow dangerous overheating.
Trích dẫn luật: 2025 CA Electrical Code, Article 310 (Conductor Ampacity)Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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