Mạch nhánh & Đi dâyCâu 233 / 521
To reduce voltage drop on a long branch-circuit run without changing the load, what is the most effective method?
a.Increase the conductor cross-sectional area (more circular mils)
b.Increase the overcurrent device rating
c.Lower the conductor insulation temperature rating
d.Add additional terminations along the run
Giải thích
Voltage drop is inversely proportional to conductor circular mils, so using a larger conductor is the direct remedy. Increasing the breaker or changing insulation rating does not lower voltage drop, and extra terminations only add resistance and points of failure.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- In the voltage-drop formula for a balanced 3-phase circuit, which multiplier replaces the factor of 2 used in single-phase calculations?
- If the one-way length of a circuit run is doubled while current and conductor size stay the same, what happens to the voltage drop?
- Per 200.6(A), a grounded (neutral) conductor 6 AWG or smaller must be identified by which of the following?
- Per 250.119, an equipment grounding conductor may be identified by which of the following?
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