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Free electrician exam prep
Flashcards, code-article drills, load calculations and theory for the 2023 NEC, with the math and the code reference behind every answer. No sign-up. Paid CE courses open as each state approves them.
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Free electrician exam prep
Flashcards and practice questions on the 2023 NEC, grounding and bonding, Wisconsin code changes and electrical safety. Free, no account needed.
Study practice written by VoltCE. These are not official exam questions and do not earn continuing-education credit. Always check the code book and your state licensing board for what applies to you.
Load calc & sizing practice
Thousands of free practice problems: conductor sizing, branch circuits, dwelling and commercial loads, motors, transformers with secondary protection, parallel conductors, conduit fill (several conduit types and insulations), voltage drop, grounding and box fill. Every answer comes with the worked solution.
Based on the 2023 NEC. Unless a problem says otherwise, assume 75°C-rated terminations, copper conductors and standard overcurrent device sizes from 240.6(A). Study practice written by VoltCE, not official exam questions, and no CE credit. Have your code book handy.
Code article study
Study one NEC article at a time, or mix them all. Classified locations, health care, EV charging, solar, pools, special occupancies and more. . Study practice written by VoltCE for the 2023 NEC; check every answer against your code book.
Free study tools
Everything here is free. Practice written by VoltCE for the 2023 NEC, with an explanation, a reference and the math behind every answer. Not official exam questions, no CE credit.
Flashcards
Memorize the code: major articles (tier 1), all other articles (tier 2), formulas (tier 3).
Code article study
Pick one article and zip through questions, or randomize across articles. Timer optional.
Index lookup drill
Practice finding answers in the code book: pick the index keyword, then pick the section.
Load calc and sizing
Thousands of problems: services, motors, conductors, conduit fill, transformers.
Electrical theory and formulas
Ohm's law, power, AC, three-phase, transformers, motors, with full worked math.
Edition changes (2017, 2020, 2023, 2026)
Review what changed between NEC editions, article by article. Cards and quiz.
Safety, grounding and NEC 2023 changes
Flashcards and quizzes on OSHA, grounding and bonding, and the 2023 updates.
Code flashcards
Memorization cards. Tier 1: major code articles. Tier 2: every other article. Tier 3: formulas and rules of thumb. Tap a card to flip it.
Code book index lookup drill
Open the index at the back of your NEC, find the entry word, then turn to the right section. Step 1: pick the keyword you would look up. Step 2: pick the section you would turn to. You will be told if you are right and how to find it next time.
Electrical theory and formula practice
Ohm's law, power, AC theory, three-phase, transformers, motors and more. Wrong answers show the formula, the math step by step and how to solve it yourself next time.
Edition changes: what moved between NEC editions
States adopt different editions. Pick the edition you know and the edition you are studying, then review what changed, article by article, as flashcards or a quiz. Steps are chained: 2017 to 2023 shows the 2017-to-2020 and the 2020-to-2023 changes.
Fromto
Summaries written by VoltCE from public change summaries. Always confirm in the actual code book for your edition and check your state's adopted edition and amendments.
Suggestion box
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