Question 1: What is the maximum voltage drop recommended by NEC for both branch conductor and feeder conductor?
- 3 %
- 4 %
- 5 %
- 6 %
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NEC 2023
NEC Code Questions Practice Test-15
Take a Practice test on NEC Code Practice quiz questions - 15
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How to Use This Practice Test
This NEC Code Questions Practice Test-15 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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15 min
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TimeNEC Code Questions Practice Test-15 — Question List
Question 2: The connected load of all-electric restaurant is 140 KVA which is supplied by a 120/208 V three phase supply. What is the required service conductor ampacity?
- 311 amperes
- 538 amperes
- 423 amperes
- 621 amperes
NEC Reference: NEC 220.88
Question 3: What size branch circuit protection is required for 20 A motor compressor connected to 240 volts single phase supply?
- 35 amperes
- 20 amperes
- 25 amperes
- 30 amperes
NEC Reference: NEC 440.22(A)
Question 4: A 30 ampere branch circuit with heavy duty lamp holders is permitted to supply fixed lightening units in .......................
- single family dwelling unit
- multi family dwelling unit
- any occupancy
- any occupancy other than dwelling unit
NEC Reference: NEC 210.23(B)
Question 5: What is the minimum general lightening load required for 1500 square foot single family dwelling unit as permitted by NEC?
- 4500 VA
- 4800 VA
- 3000 VA
- 1500 VA
NEC Reference: NEC 220.12
Question 6: What size service conductor is required for a 120/240 volts single phase with a demand load of 48 KVA?
- 200 amperes
- 150 amperes
- 100 amperes
- 250 amperes
Question 7: In calculating the load for a commercial kitchen with one electric appliance, which of the following demand factor is allowed?
- 100%
- 80%
- 90%
- 75%
NEC Reference: NEC 220.56
Question 8: The ampacity of 2/0 THHN conductor is 195 amperes ( 90<sup>0</sup> C). What is the maximum allowable ampacity of 2/0 THHN conductor in a conduit with 5 other current carrying conductors?
- 156 amperes
- 136 amperes
- 195 amperes
- 185 amperes
NEC Reference: NEC 310.15(B)(3)
Question 9: An isolated ground receptacle shall be identified by :................
- An orange triangle
- A permanent seal
- A green dot
- A cross sign
NEC Reference: NEC 406.3(D)
Question 10: If a panel board contains a snap switch with rating of 30 amperes must be protected not in excess of :
- 200 amperes
- 30 amperes
- 150 amperes
- 300 amperes
NEC Reference: NEC 408.36(A)
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