Mạch nhánh & Đi dâyCâu 228 / 521
For the combined feeder plus branch circuit, the NEC informational note recommends total voltage drop not exceed what percentage?
a.3%
b.2%
c.8%
d.5%
Giải thích
The informational notes recommend not more than 3% on the feeder and not more than 5% combined for feeder plus branch. 3% alone is the branch-circuit figure, and 2% or 8% are not the recommended totals.
Trích dẫn luật: 2023 NEC §215.2(A)(1), Informational NoteLuyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Per 320.30, Type AC cable must be secured and supported at intervals not exceeding what distance?
- Which cable relies on its metal armor together with an internal aluminum bonding strip to serve as the equipment grounding path?
- The NEC informational note recommends that voltage drop on a branch circuit not exceed what percentage of the circuit voltage?
- A 120 V single-phase circuit uses 12 AWG copper (6,530 cmil) carrying 20 A over a one-way length of 100 ft. Using VD = 2 × K × I × L ÷ cmil with K = 12.9, what is the approximate voltage drop?
- The circuit in the previous scenario has a voltage drop of about 6.6%, well above the recommended 3% for a branch circuit. What is the most appropriate corrective action?
- A 240 V single-phase circuit uses 10 AWG copper (10,380 cmil) carrying 24 A over a one-way length of 150 ft, with K = 12.9. What is the approximate voltage drop and percentage?
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