Question 1: A 2/0 THWN conductor is placed in a dry location where the ambient temperature is 45<sup>0</sup>C. What is corrected ampacity of the conductor?
- 170 Amperes
- 160 Amperes
- 165 Amperes
- 175 Amperes
NEC Reference: NEC 310.15(B)(16)
NEC_PRACTICE
NEC 2023
NEC Code Questions Practice Test-2
Free Online Practice on NEC code Questions - 2
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NEC Practice Tests
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This NEC Code Questions Practice Test-2 has 10 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.
Tip: Mixed-format test — questions jump between topics just like the real exam. Don't spend more than 90 seconds on any one question.
- Topics covered: All NEC chapters — branch circuits, grounding, conductors, wiring methods, motors, and more.
- Passing score: Aim for 80%+ consistently before scheduling your exam.
- Questions: 10 multiple-choice, one correct answer each
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TimeNEC Code Questions Practice Test-2 — Question List
Question 2: Which of the following locations Type AC cable cannot be used?
- Dry Location
- Wet Location
- Cable Trays
- Branch circuits for exposed work
Question 3: When a single generator is used to supply emergency load plus other loads, a single transfer switch can be sufficient to use.
- True
- False
NEC Reference: NEC 700.5(D)
Question 4: Mutli-wire branch circuits shall be permitted in class I division I locations.
- True
- False
NEC Reference: NEC 501.40
Question 5: Proper Grounding in electrical circuit limits ................. and protects the circuit.
- high voltage
- high current
- high power
Question 6: The branch circuits that are connected to luminaries of dwelling units shall have maximum voltage of ..................
- 120 volts
- 240 volts
- 208 volts
- 480 volts
NEC Reference: NEC 210.6
Question 7: The ampacity of the branch conductor that supplies a power supply to the motor which has FLC of 25 amperes is ...............
- 32 amperers
- 25 amperes
- 28 amperes
- 30 amperes
NEC Reference: NEC 31.25
Question 8: Branch circuits and feeders to motor controllers, driving machines shall not exceed of…….. volts
- 600 volts
- 480 volts
- 240 volts
- 120 volts
NEC Reference: NEC 620.3(A)
Question 9: What is the maximum ampere rating of a power supply feeder of mobile homes?
- 25 amperes
- 50 amperes
- 75 amperes
- 45 amperes
NEC Reference: NEC 550.10
Question 10: Dispensing devices for liquefied petroleum gas shall be located not less than …………….. feet from any dispensing device for Class I liquids
- 5 feet
- 10 feet
- 8 feet
- 4 feet
NEC Reference: NEC 514.3(B)(2)
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