NEC Code Practice Tests

Article-by-article NEC code tests updated for the 2023 National Electrical Code edition.

24 tests · 256 questions · Free · No signup · NEC 2023

The National Electrical Code (NFPA 70) is the foundation of every electrician licensing exam in the United States. These article-by-article tests let you drill into specific parts of the code — from Article 100 Definitions to Article 695 Fire Pumps.

Updated for the NEC 2023 edition. Questions are tagged by article so you can focus on the sections your state exam emphasises most. Use the explanations to learn why each answer is correct, not just what the answer is.

Art. 100 Definitions Art. 200–250 Wiring & Grounding Art. 300–358 Wiring Methods Art. 400–411 Conductors Art. 430 Motors Art. 700–701 Emergency Systems
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Wiring Methods Branch Circuits Motors
NEC 2023

Grounding and Bonding (NEC 250)

Advanced

Free online test on Grounding and bonding ( National Electrical Code - 250)

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Branch Circuits (NEC 210)

Beginner

Free online practice test on NEC code Questions (Branch Circuits)

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

NEC 240 — Overcurrent Protection Practice Test 1

Beginner

Free online NEC Article 240 overcurrent protection practice test. Covers conductor ampacity limits (14/12/10 AWG), standard OCPD ratings, the 10-foot and 25-foot tap rules, plug and cartridge fuse requirements, circuit breaker installation rules, and supplementary overcurrent protection. NEC 2023 edition — ideal for journeyman and master electrician exam preparation.

30 Q · 45 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Service Entrance , Branch circuits and feeder conductors-2

Intermediate

Service Entrance , Branch circuit conductors and Feeder conductor theory and practice test -2

11 Q · 17 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Dwelling Unit Calculations Practice Quiz - 1

Advanced

Free Online Practice Test on Single Family Dwelling Unit calculations - 1

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Motor circuit calculations (NEC 400)

Beginner

Free online nec code practice test ( Motor Circuit Calculations )

9 Q · 14 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

NEC 220 — Power System Load Calculations Practice Test 1

Beginner

Free online NEC Article 220 power system load calculations practice test. Covers single-phase and three-phase power calculations, apparent and reactive power, load factor, demand factor, power factor correction, voltage drop, transformer kVA sizing, NEC lighting unit loads (Table 220.42), small appliance circuits, range demand (Table 220.55), continuous load rules, and generator sizing. NEC 2023 edition.

30 Q · 45 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

NEC 500 hazardous locations

Advanced

Free online theory quiz test on hazardous locations (NEC 500)

8 Q · 12 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Flexible Cords and Fixture Wires (NEC 400)

Beginner

Free online practice test on Flexible Cords and Fixture Wires (NEC 400) objective questions.

8 Q · 12 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Wiring Methods (NEC 300) Practice Test

Intermediate

Free Online Practice Test on NEC(300) Wiring Methods

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Cabinets, Enclosures & Cutout Boxes (NEC 312/314)

Intermediate

Free practice NEC Code question and answers on Cabinets, enclosures, cutlet boxes.

11 Q · 17 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

NEC (310) Conductors General Wiring

Intermediate

Free online practice NEC Code Questions on NEC (310) Conductors General Wiring

1 Q · 10 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Protective Relay Objective Questions Quiz

Intermediate

Free online quiz on Protective Relay objective questions.

9 Q · 14 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Resistor Practice Quiz Questions

Intermediate

Free Online Resistor Quiz Questions

12 Q · 18 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Motor Circuit Calculations-2 (NEC 430)

Advanced

Free Online NEC Code Questions : Motor Circuit Calculations (NEC 430)

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Equipment for General Use Questions-1

Intermediate

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

11 Q · 17 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Commercial load Calculations (NEC Code Questions)

Intermediate

Free NEC Code Questions and Answers ( Commercial Load Calculations)

9 Q · 14 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Voltage Drop Calculations (NEC Code Questions)

Intermediate

Free online practice test on Conductor Voltage Drop calculations.

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Motor Circuit Calculations -3 (NEC Code Questions)

Intermediate

Online Practice Test on Motor Circuit Calculations

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Transformer Calculations NEC code Questions

Advanced

Free Online Practice Test on Transformer Calculations

6 Q · 10 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Panel and Switch Board- NEC Code Questions

Beginner

Practice Questions on Panel and Switch Boards - NEC Code Questions

5 Q · 10 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Single family dwelling unit Practice Questions

Intermediate

NEC Code Questions : Single family dwelling unit calculations

9 Q · 14 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Over current Protection Practice Test Questions-2

Beginner

Take a Practice test on Over current Protection quiz questions - 2

10 Q · 15 min · 70% pass
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Wiring Methods Branch Circuits Motors
NEC 2023

Hazardous Locations practice test questions-1

Intermediate

Take a Practice test on Hazardous locations Practice quiz questions - 1

7 Q · 11 min · 70% pass
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