Question 13057 of 844 · Washington 01 Journey Level Electrician Exam
What is the allowable ampacity of 4/0 AWG XHHW aluminum conductors in the 75 °C column at 30 °C ambient with not more than three current-carrying conductors?
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 13057
- A: 180 A
Explanation
Table 310.16 lists 180 A for 4/0 aluminum in the 75 °C column. 230 A is the copper value, 205 A is the aluminum 90 °C value and 150 A is the aluminum 60 °C value.
More questions: Electrical Calculations
- 1305812 AWG copper UF cable (60 °C rated) is installed where the ambient temperature is 40 °C. What is its corrected ampacity?
- 13059A 50 A noncontinuous load is supplied by one of six current-carrying THHN copper conductors in a raceway at 30 °C. Terminations are rated 75 °C. What is the smallest conductor size permitted?
- 13060Twenty current-carrying 12 AWG THHN copper conductors are in one raceway at 30 °C ambient. What is the adjusted ampacity based on the 90 °C column?
- 13061What adjustment factor applies when 25 current-carrying conductors are installed in a single raceway longer than 24 inches?
- 13062What ambient temperature correction factor applies to a 75 °C rated conductor at an ambient of 38 °C (tables based on 30 °C)?
- 13063A device box contains four 12 AWG insulated conductors, two 12 AWG equipment grounding conductors and one receptacle on a yoke. What minimum box volume is required?