Mạch nhánh & Đi dâyCâu 212 / 521
Per Table 310.16, what is the ampacity of an 8 AWG copper THHN conductor in the 90°C column?
a.40 A
b.50 A
c.45 A
d.55 A
Giải thích
Table 310.16 lists 55 A for 8 AWG copper at 90°C. 40 A is the 60°C value and 50 A is the 75°C value for 8 AWG copper; 45 A is not a listed value for this size.
Trích dẫn luật: 2023 NEC §310.16Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- For a branch circuit rated 100 A or less, which temperature column must be used for conductor ampacity at the terminations unless the equipment or terminals are listed for a higher temperature?
- A 90°C-rated conductor is terminated on equipment whose lugs are listed for 75°C. Which temperature column limits the conductor's final ampacity at that termination?
- Under what circumstance may the 90°C ampacity column of Table 310.16 be used?
- Per Table 310.16, what is the ampacity of a 12 AWG copper conductor in the 75°C column (before any small-conductor overcurrent limit)?
- Per Table 310.16, what is the ampacity of a 10 AWG copper conductor in the 60°C column?
- Per Table 310.16, what is the ampacity of a 6 AWG copper conductor in the 75°C column?
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