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Oklahoma Unlimited Electrical Journeyman — Practice Exam

What This Practice Exam Covers

The Oklahoma Unlimited Electrical Journeyman licensing exam contains 100 questions with a 240-minute time limit. You need a score of 70% or better to pass. The exam spans 13 topic areas drawn from the NEC 2023, OSHA construction standards, and supporting references such as Ugly's Electrical References.

This practice exam comes in two formats:

• Free practice exam: 10 questions per attempt, drawn from a limited pool. You can retake it as many times as you like to get a feel for question style, wording, and pacing — a useful first step before committing to serious prep.
• Full practice exam (paid): Mirrors the real exam — 100 questions, 240-minute timer, drawn from a pool of 495+ questions. Because the pool is large, every attempt produces a different exam, so repeated attempts continue to build and test your knowledge without repetition. Questions map directly to the official exam topic distribution.

Start with the free exam to establish a baseline, then use the full exam for structured preparation.

What You'll Be Tested On

General Knowledge (4 items) — These questions probe NEC fundamentals: the scope of NEC 90.2(A), the difference between mandatory language ("shall") and permissive language ("shall be permitted") per Article 90.5(A), the authority of the AHJ under Article 90.4(B), and how SI and U.S. units convert per Article 90.9(B). Expect a question distinguishing trade names from NEC article references, or identifying a schematic symbol.

General Electrical Knowledge (10 items) — The largest calculation-heavy topic outside of services. You must apply Ohm's Law and power formulas across series, parallel, and combination circuits. AC/DC current formulas, kVA and horsepower conversions, and voltage drop for both single-phase and three-phase systems appear here. Know how to apply temperature correction factors using NEC 2023, Table 310.15(C)(1) and how to apply adjustment factors for bundled conductors using NEC 2023, Table 310.15(B)(1)(1). These are multi-step problems — set up the formula first.

Electrical Installation Requirements (10 items) — Covers branch-circuit conductor sizing using NEC 210.19(A)(1) and NEC 210.19(C), GFCI requirements by location under NEC 210.8 and NEC 210.8(A), AFCI protection per NEC 210.12(B), and receptacle spacing rules for dwelling and non-dwelling occupancies. Load calculations using demand factors for cooking equipment and dryers appear in this section. Underground installation cover depths by wiring method are also tested.

Services, Feeders, and Branch Circuits (10 items) — Expect service conductor sizing using NEC 230.42(A)(1) and NEC 230.31(B), service disconnect rules under NEC 2023, Section 230.71(A), and overhead clearance requirements from NEC 230.24(B) and NEC, Section 230.24(A). Ground-fault protection of equipment is addressed in NEC, Section 230.95. Feeder conductor sizing appears in NEC 215.2(A)(1). Voltage drop for three-phase feeders is common here — know the three-phase formula cold.

Overcurrent Protection (9 items) — Standard ampere ratings from NEC 2023, Table 240.6(A) are tested directly. Tap conductor rules appear in NEC 2023, Section 240.21(B)(1), NEC 2023, Section 240.21(B)(2), and NEC 2023, Section 240.21(B)(4). Motor branch-circuit protective device sizing uses NEC 2023, Table 430.52. Arc energy reduction requirements are addressed in NEC 2023, Section 240.87. Plug fuse, cartridge fuse, and Type S fuse rules appear in NEC 2023, Section 240.50(C) and NEC 2023, Section 240.52.

Grounding and Bonding (10 items) — One of the highest-stakes sections on the exam. You must know grounding electrode types and installation under NEC 2023, Section 250.52(A)(1), NEC 2023, Section 250.52(A)(3), and NEC 2023, Section 250.52(A)(4), along with spacing rules per NEC 2023, Section 250.53(A)(2). GEC sizing comes from NEC 2023, Section 250.66(A) and NEC 2023, Section 250.66(B). Main bonding jumper requirements fall under NEC 2023, Section 250.28(A) and NEC 2023, Section 250.28(D)(1) and Table 250.102(C)(1). Equipment grounding conductor types and sizing pull from NEC Table 250.122.

Conductors and Cables (7 items) — Ampacity from NEC 2023, Table 310.17 and correction/adjustment factors from NEC 2023, Table 310.15(B)(1)(1) and NEC 2023, Table 310.15(C)(1) are central. Cable type applications — NM, MC, AC, SE, USE, UF, MI — are tested on permitted vs. not-permitted uses. Securing and bending radius rules for cable types such as MC (NEC 2023, Section 330.24(A)) and MI (NEC 2023, Section 332.24) appear frequently. Know minimum conductor sizes for copper vs. aluminum.

Raceways and Boxes (8 items) — Conduit fill percentages and conductor count limits from NEC Chapter 9 drive conduit fill questions. Box fill calculations use NEC 314.16(B), NEC Table 314.16(B)(1), and volume allowances per NEC Table 314.16(A). Pull and junction box sizing for straight pulls (NEC 314.28(A)(1)) and angle pulls (NEC 314.28(A)(2)) require multiplication — know the formulas. Metallic conduit uses (RMC, IMC, EMT, FMC) and nonmetallic conduit uses (PVC, ENT, LFNC) are tested on a permitted/prohibited basis.

Special Occupancies and Equipment (10 items) — Hazardous location classification (Class I, II, III; Divisions 1 and 2; Zone systems) appears under NEC 500.5(B)(1), NEC 500.5(B)(2), and NEC 500.5(C) and 500.5(D). Protection techniques — explosionproof (NEC 500.7(A)), intrinsically safe (NEC 500.7(B)), pressurized (NEC 500.7(D)) — are tested on definitions and application. Health care essential electrical system branches and patient care space wiring standards are also covered.

Low Voltage, Alarms, Signaling, and Communications (6 items) — Fire alarm circuit wiring, PLFA cable types and substitutions, and Class 2/Class 3 circuit separation rules are common questions. Emergency system wiring and alternate power sources fall under NEC 700.12 and NEC 700.12(C). Communications cable types by building location (plenum, riser, general-purpose) and bonding of communications systems round out this topic.

Lighting and Signs (4 items) — Luminaire location rules for wet, damp, and closet installations (NEC 410.10(A), NEC 410.16(C)(3)), recessed luminaire clearance from insulation (NEC 410.116(A)(1)), and lighting track restrictions (NEC 410.154) are all tested. Sign wiring requirements from NEC 600.5(C)(1) and NEC 600.23(D) also appear.

Safety (10 items) — OSHA standards dominate: lockout/tagout under 29 CFR 1926, §1926.1204(e)(3), fall protection at 29 CFR 1926, §1926.501(b)(1), PPE selection at 29 CFR 1926, §1926.95(b), and flammable liquid storage at 29 CFR 1926, §1926.152(b)(1). Arc-flash labeling and approach boundaries are tested. These are definition and threshold questions — memorize specific values.

Motors and Transformers (2 items) — Motor branch-circuit conductor sizing at 125% of FLA per NEC 430.22(A), protective device selection from NEC 2023, Table 430.52, and motor feeder sizing from NEC 2023, Section 430.62(A). Transformer primary/secondary overcurrent protection sizing also appears.

Worked Sample Questions

Question 1 — General Electrical Knowledge

In industrial establishments with qualified personnel, flexible cords and cables shall be permitted to be installed in aboveground raceways that are no longer than _____ meters to protect from physical damage.

• A. 10
• B. 15
• C. 20
• D. 25

Correct Answer: B — 15 meters

Per NEC 400.17, in industrial establishments where maintenance and supervision conditions ensure only qualified persons service the installation, flexible cords and flexible cables may be run in aboveground raceways not exceeding 15 m (50 ft). The 50-foot imperial equivalent is a useful cross-check. Wrong answers cluster around 10 m (too short) and the longer values, which have no code basis for this specific permission.

Question 2 — Electrical Installation Requirements

What is the minimum branch-circuit rating required for household ranges rated 8¾ kW or more?

• A. 30 amperes
• B. 35 amperes
• C. 40 amperes
• D. 50 amperes

Correct Answer: C — 40 amperes

Per NEC 210.19(C), the minimum branch-circuit rating for household ranges rated 8¾ kW or more is 40 amperes. A common error is selecting 50 amperes because larger ranges are often wired at that rating in practice, or selecting 30 amperes by confusing this rule with small-appliance circuit requirements. The question tests the code floor, not typical field practice.

Question 3 — Services, Feeders, and Branch Circuits

A building is served by a single service. What is the maximum number of service disconnects permitted for that service?

• A. Four
• B. Six
• C. Two
• D. Eight

Correct Answer: B — Six

Per NEC 2023, Section 230.71(A), a service may have no more than six disconnecting means grouped at one location. Disconnects used solely for power monitoring equipment, surge-protective devices, control circuits of ground-fault protection systems, or power-operable disconnecting means do not count toward this limit. Candidates frequently misremember this as "four" — the number six is the code limit and appears on the exam repeatedly.

How to Read Your Score

The passing threshold is 70% — meaning 70 correct answers out of 100. Your first practice score is best treated as a diagnostic: it tells you where your knowledge is solid and where it has gaps, not whether you are ready to sit the exam.

If you score below 60%, expect to focus heavily on the calculation-heavy sections — General Electrical Knowledge, Services/Feeders/Branch Circuits, and Grounding and Bonding together account for 30 items. A score between 60% and 69% means you are in the zone where one or two weak topic areas are pulling your total below the line. Use the topic breakdown to identify which specific sections are costing you — then go back to the code sections cited in those topics before your next attempt.

Scoring 70–79% on practice does not guarantee a pass on the real exam. The real exam pulls from a wide question pool and may emphasize subtopics you haven't seen yet. A comfortable buffer — 80% or above, consistently across multiple full attempts — indicates genuine readiness. Because the full practice exam draws from 495+ questions, repeated attempts expose you to more of the question pool without repeating the same exam.

Where Candidates Lose Points

Mixing up table references. The exam tests specific tables — NEC 2023, Table 310.15(C)(1) for temperature correction, NEC 2023, Table 310.15(B)(1)(1) for bundling adjustment, NEC Table 250.122 for equipment grounding conductors, NEC 2023, Table 430.52 for motor protective devices. Using the wrong table produces a wrong answer even when the calculation setup is correct.

Skipping ampacity adjustment steps. Candidates often pull an ampacity directly from NEC 2023, Table 310.17 or Table 310.15(B)(1)(1) without applying both a temperature correction factor and a bundling adjustment factor when both conditions exist. Each missed step cascades into the wrong conductor size.

Misreading service disconnect rules. The six-disconnect limit under NEC 2023, Section 230.71(A) trips up candidates who confuse it with feeder rules or who forget which disconnects are excluded from the count.

Confusing OSHA thresholds in the Safety section. Safety questions under 29 CFR 1926 test specific numeric values — fall protection heights, approach boundaries, flammable liquid container capacities. A close-but-wrong number is still a lost point.

Running out of time on pull box sizing. NEC 314.28(A)(1) and NEC 314.28(A)(2) require straightforward multiplication, but candidates who are unfamiliar with the formula spend too much time on these during the exam. Practice these calculations until they are automatic.

Treating permissive rules as mandatory. Confusing "shall be permitted" with "shall" — a distinction the exam tests directly under Article 90.5(A) — causes candidates to eliminate the correct answer as too lenient or too strict.

Exam Quick Facts