Dịch vụ & Phân phốiCâu 19 / 521
Six current-carrying conductors are installed in a single raceway. What adjustment factor applies to their ampacity?
a.70%
b.50%
c.80%
d.100%
Giải thích
Table 310.15(C)(1) applies an 80% adjustment factor for 4 to 6 current-carrying conductors. 70% is for 7-9, 50% is for 10-20, and no adjustment (100%) applies only to 3 or fewer.
Trích dẫn luật: 2023 NEC §310.15(C)(1)Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- What is the 75 C ampacity of a 4/0 AWG copper conductor per Table 310.16?
- At the 75 C column of Table 310.16, what is the ampacity of a 1/0 AWG copper conductor?
- A 4/0 AWG copper THHN conductor (90 C, base 260 A) is in an ambient of 45 C. Using the 0.87 correction factor, what is the corrected ampacity?
- How many current-carrying conductors can be in a raceway before an adjustment (fill derating) factor must be applied?
- For equipment terminals on a circuit rated 100 A or less (not marked otherwise), which temperature column must be used to size conductors?
- A feeder supplies a continuous load of 176 A. What minimum conductor ampacity (before derating) is required?
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