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NEC CODE NEC 2023

Equipment for General Use Questions-1

Free NEC 400: Equipment For General Use Practice Questions-1

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Frequently Asked Questions

Yes — free, no signup required. Each question links to the relevant NEC article so you can study the code directly.

The National Electrical Code (NFPA 70) is the benchmark standard for safe electrical installation in the US. It is updated every 3 years by the NFPA.

Study the edition adopted by your state. As of 2025, most states use the 2020 or 2023 NEC. These tests are written to the 2023 edition.

The most tested articles are 100 (Definitions), 200–250 (Wiring & Grounding), 300–314 (Wiring Methods), 400–411 (Conductors), 430 (Motors), and 700–701 (Emergency Systems).

How to Use This Practice Test

This Equipment for General Use Questions-1 has 11 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: Use the NEC index (back of the book) — find answers by keyword, not by article number.

Topics covered: NEC articles 100, 210, 220, 240, 250, 300, 310, 430, and special occupancies.
Passing score: Aim for 80%+ on NEC code tests before exam day.
Questions: 11 multiple-choice, one correct answer each

10

Questions

17 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Equipment for General Use Questions-1 — Question List

Question 1: Which of the following is the minimum approved wire size that is permitted for a device which is permanently attached to the building?

12 AWG
16 AWG
18 AWG
10 AWG

NEC Reference: NEC 402.6

Question 2: The dust breaker shall not be installed on .........................

Panel Boards
Junction boxes
Enclosures
Boxes

NEC Reference: NEC 408.36(C)

Question 3: If a 20 amp branch circuit supplies only 120 volt cord and plug type window air conditioner cannot have full load rating of which of the following?

10 amp
16 amp
18 amp
20 amp

NEC Reference: NEC 440.62(B)

Question 4: A Transformer vault doorway that is protected with automatic sprinkler, water spray shall have a minimum fire rating of ......................

1 hour
3 hours
1/2 hour
2 hours

Question 5: Even if the Ground Fault interrupter protection is provided for impedance heating elements, What is the maximum transformer secondary voltage permitted?

30 volts
80 volts
65 volts
50 volts

Question 6: Fixed outdoor electric deicing and snow melting equipment shall be considered as ..................

continuous load
Non continuous load
Heavy load
Not important load for service conductor calculations

Question 7: Which of the following is an allowable ampacity of an 10 AWG fixture wire?

23 amp
17 amp
28 amp
30 amp

NEC Reference: NEC 402.5

Question 8: Which of the following is the nominal voltage of lead-acid cell?

2 volts
1.2 volts
1.7 volts
2.2 volts

NEC Reference: NEC 480.2

Question 9: Which of the following is a 300 volts motor disconnecting means?

At Least 125% of motor full load current
Not less than 115% of motor full load current
Not Greater Than 120% motor full load current
150 amperes

Question 10: Which of the following is not a rating of a branch circuit used for electric space heaters installed in dwelling family unit?

30 amp
40 amp
20 amp
25 amp

NEC Reference: NEC 424.3

Key NEC References for This Test

Article	What It Covers
Ch. 1–4	General rules — apply to all installations
Ch. 5–7	Special rules — override Ch. 1–4 where they conflict
Ch. 8	Communications — completely independent of Ch. 1–7
Ch. 9	Tables — referenced by articles, not standalone enforceable rules
Art. 210.12	AFCI — major expansion in NEC 2026
Art. 230.67	Surge protection at service equipment — new NEC 2026

Study Tip: Learn the NEC index — use keywords, not article numbers. Practice finding 5 different topics in under 2 minutes each.

EXAM CARD NEC CODE

Questions10

Time limit17 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)