Question 1: The rated ampacity of a 1/0 THWN in a wet location is 150 amperes. If the same conductor is operated at ambient temperature of 40<sup>0</sup>C. What is its corrected ampacity?
- 132 amperes
- 150 amperes
- 142 amperes
- 138 amperes
NEC_PRACTICE
NEC 2023
NEC Code Questions Practice Test-3
Free Online Practice Test on NEC Code Objective Questions
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This NEC Code Questions Practice Test-3 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-3 — Question List
Question 2: When eight three wire type AC cables are bundled in a raceway of length more than 24 inch. what is the adjustment factor that must be applied?
- 60 %
- 70 %
- 80 %
- 90 %
Question 3: The flexible cords employed for pool associated motors shall not exceed ………….. feet in length.
- 3
- 5
- 8
- 12
NEC Reference: NEC 680.21
Question 4: Whether by receptacle or direct connection the outlets supplying pool pump motors shall be provided with …………………………………… protection
- Over Current
- GFCI
- Over voltage
NEC Reference: NEC 680.21(C)
Question 5: When a conduit run passing from a Class I , Division 2 location into a unclassified location must have seal located with …………….. feet of the boundary.
- 10
- 15
- 20
- 8
NEC Reference: NEC 501.15
Question 6: If a panel board is supplied by a transformer. The over current device must be located ............. side of the transformer
- Primary Side
- Secondary Side
Question 7: Which of the following is the maximum rating of a branch circuit that supply the primary of low voltage lighting system power supply?
- 20 amperes
- 25 amperes
- 15 amperes
- 30 amperes
NEC Reference: NEC 411.6
Question 8: A lighting unit is connected on a 20 ampere branch circuit on which a fastened-in place appliance is located. What is the maximum percentage branch circuit rating is permitted on the appliance?
- 50 %
- 75 %
- 60 %
- 40 %
NEC Reference: NEC 210.23(A)(2)
Question 9: Which of the following is the smallest size wire permitted for a feeder circuit?
- No 10 AWG
- No 12 AWG
- No 14 AWG
- No 8 AWG
Question 10: When two or more single phase electric ranges are supplied by a 3 phase , 4 wire feeder, the total load computed is on the basis of ………………………….
- Twice the maximum number connected between any two phases
- Four times the maximum number connected between any two phases
- Three times the maximum number connected to a single phase
NEC Reference: NEC 250.55
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