Question 13033 of 844 · Washington 01 Journey Level Electrician Exam
A three-phase 480 volt load draws 50 A over 6 AWG copper conductors (26,240 circular mils), 200 feet one way. What is the line-to-line voltage drop?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 13033
- A: 8.52 V
Explanation
For three-phase circuits VD = 1.732 x K x I x L / CM = 1.732 x 12.9 x 50 x 200 / 26,240 = 8.52 V. Using the single-phase factor 2 gives 9.83 V, and using the aluminum K gives 13.99 V.
More questions: Electrical Calculations
- 13034A 240 volt single-phase feeder uses 4 AWG aluminum conductors (41,740 circular mils), 175 feet one way, carrying 60 A. Using K = 21.2 for aluminum, what is the voltage drop?
- 13035A 240 volt single-phase load of 40 A is located 180 feet from the panel. What is the smallest copper conductor that keeps voltage drop at or below 3 %?
- 13036A three-phase 208 volt load of 90 A is 150 feet from the source. Ignoring ampacity, what is the smallest copper conductor that limits voltage drop to 3 %?
- 13037A three-phase 480 volt load of 100 A is 300 feet away. Ignoring ampacity, what is the smallest aluminum conductor that holds voltage drop to 3 %?
- 13038What is the maximum one-way length for a 120 volt circuit of 12 AWG copper (6,530 circular mils) carrying 16 A if voltage drop must not exceed 3 %?
- 13039A 240 volt single-phase circuit of 8 AWG copper (16,510 circular mils) runs 120 feet one way. What is the maximum load current that keeps voltage drop at 3 %?