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NEC_PRACTICE NEC 2023

NEC Code Questions Practice Test-5

Free Online Practice Test on NEC Code Questions-5

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How to Use This Practice Test

This NEC Code Questions Practice Test-5 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

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NEC Code Questions Practice Test-5 — Question List

Question 1: A single family dwelling unit has a connected load of 4000 VA. which of the following is the calculated demand load?

3350 VA
3550 VA
4000 VA
3850 VA

NEC Reference: NEC 220.42

Question 2: What is the adjustment ampacity of a 3/0 THWN conductor at an ambient temperature of 108<sup>0</sup>F in wet location. The raceway contains four 3/0 THWN conductors in it.

119 amperes
144 amperes
153 amperes
133 amperes

NEC Reference: NEC 310.15(B)(16)

Question 3: In a dwelling unit has an electric heater rated at 5040 watts at 240 volts. What of the circuit breaker is used to protect the circuit?

20 amperes
21 amperes
24 amperes
25 ampere

Question 4: Which of the following locations type NM cable can be permitted to use?

As a service entrance cable
In storage battery rooms
In elevators or escalators
one and two family dwelling units

NEC Reference: NEC 334.12

Question 5: In an underground service a bare neutral conductor can be buried in the ground with out any insulation.

True
False

NEC Reference: NEC 230.30

Question 6: 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

Question 7: What is the unit load per square foot in volt ampere for a restaurant?

2 VA
1 VA
3 VA
1 1/2 VA

NEC Reference: NEC 220.12

Question 8: What is permissible voltage drop in percentage for feeders at the farthest outlet of power heating and lighting loads?

3 %
2 %
4 %
5 %

NEC Reference: NEC 215.2(A)(4)

Question 9: At least one 15 or 20 ampere receptacle should be located within 50 feet of electrical service applies to outdoor service equipment.

True
False

Question 10: The overall length of the power supply cards for mobile homes shall not be less than ………… feet

20 feet
36 ½ feet
25 feet
34 feet

NEC Reference: NEC 550.10(D)

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)