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NEC_PRACTICE NEC 2023

NEC Code Questions Practice Test-9

Free Online Practice Quiz NEC Code Questions-9

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How to Use This Practice Test

This NEC Code Questions Practice Test-9 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

10

Questions

15 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

NEC Code Questions Practice Test-9 — Question List

Question 1: what size of conductor must be used to protect against over current for a continuous load of 22 amperes at 75<sup>0</sup>C?

10 THWN
12 THWN
16 THWN
8 THWN

NEC Reference: NEC 27.5

Question 2: What size of feeder conductors are required for a dwelling unit which has a calculated load of 240 A. The service disconnect is rated for 250 A and feeder conductors carry entire load of the dwelling unit?

1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG

NEC Reference: NEC 207.5

Question 3: What size branch circuit conductor is required for a 4000 W, 240 electric water heater?

12 AWG
14 AWG
8 AWG
10 AWG

NEC Reference: NEC 422.10(A)

Question 4: How many number of 500 kcmil THWN conductors that can be installed in a 4 in. * 4 in. wireway?

4 conductors
5 conductors
6 conductors
7 conductors

NEC Reference: NEC 376.22(A)

Question 5: If a service is fed by three parallel sets of 400 kcmil conductors, what is the required conductor size for GEC?

3/0 AWG
2/0 AWG
2 AWG
4 AWG

NEC Reference: NEC 250.166

Question 6: Which of the following is the size of single supply-side bonding jumper is required for three metal raceways, each containing 300 kcmil service conductors?

2 AWG
3 AWG
1/0 AWG
1 AWG

NEC Reference: NEC 250.102(C)(1)

Question 7: If the length doesn’t exceed ………. Feet the cord and plug connections are allowed for swimming pool pump motors?

3 feet
5 feet
10 feet
8 feet

Question 8: After the demand factor is applied , what is the general lighting load of a hospital which is having 80,000 sq ft area?

42,000 VA
1,60,000 VA
58,000 VA
82, 000 VA

NEC Reference: NEC 220.12

Question 9: A 115/230 delta configured three phase transformer is rated at 45 KVA. What is its high-leg voltage of the transformer secondary?

230 volts
399 volts
199 volts
208 volts

Question 10: What is the maximum size over current device is required for a 4200 W, 240 V electric water heater connected in a building.

25 A
30 A
35 A
40 A

NEC Reference: NEC 26.25

EXAM CARD NEC_PRACTICE

Questions10

Time limit15 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)