Checked 27 October 2026. The worked examples are written on NFPA 70, 2023 edition. Section numbers move between editions, so check which edition your state tests: Texas moved to the 2026 NEC on 1 September 2026. Format facts from the Oklahoma PSI bulletin effective 11 September 2026, read 27 October 2026.
People look for journeyman electrician practice test questions to find out what the exam asks and how fast they can answer. The official sources read for this guide contain no actual exam questions, so the useful practice is questions written from the same code book, worked by finding and applying the relevant code rule or table. This page works through two of ours on the 2023 NEC, one calculation and one code table lookup, then sets out the formulas and tables the calculation questions lean on, and what each area of a published outline asks.
ProSyllabus is an independent study site. It is not PSI, a state licensing board or the National Fire Protection Association, and nothing here is an exam paper. Exam facts on this page come from the official bulletin and board pages listed at the foot of the page.
Exam facts: Oklahoma Construction Industries Board, PSI Candidate Information Bulletin, effective 11 Sep 2026 (read 27 Oct 2026).
FreeTests: Area 6: Grounding and bonding · Area 8: Raceways and boxes · Area 2: General electrical knowledge
Journeyman Electrician Practice Test: free sample
Answer 3 questions against the clock, like the real exam. You then see the right answer, the reason and your time on each. About 8 minutes · free · no sign-in.
3 questions to answer
Start nowabout 8 minThis one is free · no sign-in needed
Your result shows how long each question took you.
How to use the worked examples
Have the 2023 NEC open for these examples, and check your own exam’s edition and book rules. Pick an answer before you open "Show the answer", and time yourself: 240 minutes for 100 scored questions on Oklahoma’s Unlimited Electrical Journeyman exam averages 2.4 minutes a question (our arithmetic). Then read the reason and the section it rests on, and find that section in your own book. Knowing where a rule sits is what lets you answer a differently worded question on it.
Worked example 1: a box fill calculation
Worked example 1 · Area 8: Raceways and boxes
A 4 in x 1-1/2 in square metal box (21.0 cu in) holds only conductors, with no devices, clamps or grounding conductors. How many 12 AWG conductors may it hold?
- (A) 10
- (B) 8
- (C) 7
- (D) 9
Show the answer
Answer: (D) 9. 1) Table 314.16(A): a 4 in x 1-1/2 in square box is 21.0 cu in. 2) Table 314.16(B): each 12 AWG conductor needs 2.25 cu in. 3) 21.0 / 2.25 = 9.33, so 9 conductors (always round down). 10 would be the count for 14 AWG at 2.0 cu in each.
Section to reread: NEC 314.16
An original ProSyllabus question written from the 2023 NEC. Not a question from any exam.
Why it matters: box fill questions come up because every device and junction box on a job has to be sized. The method: work out each volume allowance under 314.16(B), using the cubic inches per conductor size from Table 314.16(B), add them, and compare the total with the box volume from Table 314.16(A) or marked on the box. A conductor count always rounds down.
FreeTests: Area 6: Grounding and bonding · Area 8: Raceways and boxes · Area 2: General electrical knowledge
Journeyman Electrician Practice Test: free sample
Answer 3 questions against the clock, like the real exam. You then see the right answer, the reason and your time on each. About 8 minutes · free · no sign-in.
3 questions to answer
Start nowabout 8 minThis one is free · no sign-in needed
Your result shows how long each question took you.
Worked example 2: a code table lookup
Worked example 2 · Area 6: Grounding and bonding
A service has 3/0 AWG copper ungrounded conductors. What size copper grounding electrode conductor does Table 250.66 require to a metal water pipe electrode?
- (A) 6 AWG
- (B) 4 AWG
- (C) 8 AWG
- (D) 2 AWG
Show the answer
Answer: (B) 4 AWG. NEC Table 250.66: for copper service-entrance conductors of 2/0 or 3/0 AWG, the copper grounding electrode conductor is 4 AWG. A water pipe electrode is not one of the electrodes that 250.66(A), (B) or (C) lets you size smaller.
Section to reread: NEC Table 250.66
An original ProSyllabus question written from the 2023 NEC. Not a question from any exam.
Why it matters: many grounding and bonding sizing questions involve a table lookup, after you identify the rule and any exceptions that apply, and the trap is opening the wrong table. Table 250.66 sizes the grounding electrode conductor from the size of the service conductors; Table 250.122 sizes an equipment grounding conductor from the rating of the overcurrent device. Read which conductor the question asks about before you open the book.
Formulas the calculation questions use
| Calculation | Formula |
|---|---|
| Ohm’s law | E = I x R, I = E / R, R = E / I |
| Power, DC or resistive loads | P = E x I; P = I squared x R (heat lost in conductors); P = E squared / R. For single-phase AC real power (RMS values), P = E x I x power factor |
| Three-phase power and current, balanced loads | P = E x I x 1.732 x power factor; I = VA / (E x 1.732), with E the line-to-line voltage and I the line current |
| Voltage drop, single-phase (approximation) | VD = 2 x K x I x L / CM, with I in amperes, L the one-way length in feet, CM in circular mils from Chapter 9, Table 8, and K about 12.9 for copper |
| Voltage drop, three-phase (approximation) | VD = 1.732 x K x I x L / CM, same units |
| Continuous loads | General rule: conductors and overcurrent devices at 125% of the continuous load plus 100% of the rest (210.19, 210.20, 215.2, 215.3), with the exceptions those sections give, such as assemblies listed for 100% operation |
| Ampacity correction and adjustment | Table 310.16 value x ambient factor (310.15(B)) x adjustment factor for more than three current-carrying conductors (310.15(C)(1)), then check the terminal limit (110.14(C)) |
| Conduit fill | Sum of conductor areas (Chapter 9, Table 5) against the allowed share of the raceway area (Chapter 9, Tables 1 and 4): 53% for one conductor, 31% for two, 40% for more than two, with the notes to the tables |
| Motors | In general, use the table full-load current (430.6(A)(1)); a continuous-duty motor’s conductors at 125% (430.22(A)); several motors at 125% of the highest full-load current plus the rest (430.24); short-circuit protection by Table 430.52(C)(1). Each rule has its own exceptions |
| Dwelling general lighting | 3 VA per square foot (220.41), plus 1,500 VA for each small-appliance and laundry circuit (220.52), then the Table 220.45 demand factors |
These are summaries in our own words with the section to look up. The exact rules, exceptions and table values are in the 2023 NEC, which NFPA lets anyone read free online.
The tables you will open most
An open-book exam rewards knowing which table answers which kind of question. These are 2023 NEC tables our own practice questions send candidates to, with what each one is for. Tab them before the exam, with permanent tabs if your bulletin allows them.
| Table | What it answers |
|---|---|
| Table 110.26(A)(1) | Depth of working space in front of equipment, by voltage to ground and by condition 1, 2 or 3 |
| Table 220.42(A) and Table 220.45 | General lighting unit loads for non-dwelling occupancies, and the demand factors for general lighting |
| Table 220.55 | Demand loads for household ranges and cooking appliances, with its notes for ranges over 12 kW |
| Table 250.66 and Table 250.102(C)(1) | Grounding electrode conductor size, and the size of supply-side bonding jumpers and water-pipe bonding, from the size of the service conductors |
| Table 250.122 | Minimum equipment grounding conductor size from the rating of the overcurrent device |
| Table 300.5(A) | Minimum cover for underground cables and raceways, by wiring method and location |
| Table 310.16 with 310.15(B) and (C) | Conductor ampacity, with the ambient temperature correction and the adjustment for more than three current-carrying conductors |
| Tables 314.16(A) and (B) | Volume of standard boxes, and the cubic inches needed per conductor size |
| Chapter 9, Tables 1, 4, 5 and 8 | Conduit fill percentages, raceway areas, conductor areas and conductor properties (circular mils and resistance) for voltage drop |
| Tables 430.248, 430.250 and 430.52(C)(1) | Motor full-load currents (single-phase and three-phase), and the maximum short-circuit and ground-fault protection by device type |
| Table 450.3(B) | Maximum overcurrent protection for transformers of 1000 V and less |
FreeTests: Area 6: Grounding and bonding · Area 8: Raceways and boxes · Area 2: General electrical knowledge
Journeyman Electrician Practice Test: free sample
Answer 3 questions against the clock, like the real exam. You then see the right answer, the reason and your time on each. About 8 minutes · free · no sign-in.
3 questions to answer
Start nowabout 8 minThis one is free · no sign-in needed
Your result shows how long each question took you.
Traps that cost marks
- Nameplate versus table current for motors. For general motors, conductors and short-circuit protection generally use the table full-load current; separate overloads use the nameplate current.
- Rounding. Box fill counts round down; conduit fill counts round down too, except where Note 7 to the Chapter 9 tables allows the next whole number for a fraction of 0.8 or more; overcurrent ratings go up to the next standard size only where a rule allows it.
- The terminal temperature limit. A 90 degree C conductor can start the ampacity adjustment, but the result cannot exceed what the terminals allow under 110.14(C).
- One-way length. The single-phase voltage drop formula already doubles the length for the return conductor; do not double it again.
- Continuous loads. For a load expected to run at its peak for at least three hours, the continuous-load rules generally apply: 125% for the conductors and for the overcurrent device.
- Similar lists. GFCI locations and AFCI rooms, or the three conditions in a working space table, are easy to mix up under time pressure: open the right section rather than relying on memory.
What each area of the outline asks
The published Oklahoma outline gives the number of questions in each area. The bar chart below shows how the ProSyllabus practice test spreads its own questions over the same areas: our counts, not an exam’s.
ProSyllabus practice test: 246 questions, including a full mock of 100 and a set of electrical calculations. Our counts, not the weighting of any exam.
| Fact | Published exam (Oklahoma) | ProSyllabus mock |
|---|---|---|
| Questions | 100 scored, plus up to ten unscored | 100 in the full mock, split by area as the bulletin lists, plus area sets and 34 calculations |
| Time | 240 minutes | 240 minutes for the full mock |
| Pass mark | 70% correct | Your score by area on our questions; it does not predict an exam result |
| Code edition | NFPA 70, 2023, as revised and adopted by the Oklahoma Uniform Building Code Commission | NFPA 70, 2023 |
| Answers explained | A diagnostic report of strengths and weaknesses by examination type if you do not pass | Every answer, with the NEC 2023 article and section behind it and every calculation worked line by line |
Want the full practice test?
The ProSyllabus journeyman electrician practice test has a full mock of 100 questions with a 240-minute clock, a set of electrical calculations and a set for each of the 13 outline areas, your score by area and the NEC sections to reread. Three questions are free, including the two above; the rest is paid. It is written on the 2023 NEC for candidates whose state exam uses that edition. Our own questions, not made or endorsed by PSI, any state board or NFPA. For the exam format and code-book rules, see the journeyman electrician exam guide.
FreeTests: Area 6: Grounding and bonding · Area 8: Raceways and boxes · Area 2: General electrical knowledge
Journeyman Electrician Practice Test: free sample
Answer 3 questions against the clock, like the real exam. You then see the right answer, the reason and your time on each. About 8 minutes · free · no sign-in.
3 questions to answer
Start nowabout 8 minThis one is free · no sign-in needed
Your result shows how long each question took you.
Frequently asked questions
Can I get real journeyman electrician exam questions?
The official sources read for this guide contain none. Practise on questions written from the code edition your state uses, with your own code book open.
Are these real exam questions?
No. They are ProSyllabus’s own questions, written from the 2023 NEC. Nothing here comes from a PSI or state exam.
How many calculation questions are on the exam?
Outlines differ by state. The Oklahoma outline names calculation topics inside several areas, such as general electrical knowledge (circuits, power, cost of power), voltage drop under services and feeders, and conduit and box fill under raceways and boxes; it also has a motors and transformers area.
Should I memorize the NEC?
Not word for word. The Oklahoma exam described here is open book; check your licensing authority’s rules. Learn where the rules and tables are, and practise the common calculations until the method is automatic.
Will passing the ProSyllabus mock mean I pass the exam?
No. A practice score is not an exam result and does not predict one. The questions are ours, not an exam’s.
More in this series
Sources
- official — Oklahoma Construction Industries Board: PSI Candidate Information Bulletin (effective 11 Sep 2026)
- official — NFPA 70, National Electrical Code, 2023 edition: free read-only access (NFPA)
- official — PSI: Texas Department of Licensing and Regulation Electrician Candidate Information Bulletin (updated 15 Sep 2026)
- official — Texas Department of Licensing and Regulation: Electrician exam information
- official — 29 CFR Part 1926, Safety and Health Regulations for Construction (eCFR)
official = a document published by the conducting body. reported = a news or coaching site we could not check against an original. Where sources disagree this page says so rather than picking one.
