What's on the Oklahoma Unlimited Electrical Contractor Exam? All 13 Areas and the Oklahoma Amendments
The PSI outline for the Oklahoma unlimited electrical contractor trade exam: 100 items across 13 areas on the 2023 NEC as adopted by the OUBCC, the two Oklahoma amendments that change answers, where the 2026 NEC stands, and a study plan built on the weights.
Contents
What's on the Oklahoma Unlimited Electrical Contractor Exam?
The PSI candidate bulletin for the Oklahoma Construction Industries Board (CIB) publishes the Unlimited Electrical Contractor trade exam as 13 areas with the number of scored items in each. It is 100 scored items in 240 minutes, open book, and you need 70 to pass.
This is the trade portion. Every Oklahoma contractor also has to pass the separate 50-question Electrical Business and Law exam; see Oklahoma Electrical Business and Law requirements for that one.
The outline (100 items)
| Area | Items |
|---|---|
| General Knowledge | 4 |
| General Electrical Knowledge | 10 |
| Electrical Installation Requirements | 10 |
| Services, Feeders, and Branch Circuits | 10 |
| Overcurrent Protection | 9 |
| Grounding and Bonding | 10 |
| Conductors and Cables | 8 |
| Raceways and Boxes | 7 |
| Special Occupancies and Equipment (Including Swimming Pools) | 10 |
| Low Voltage, Alarms, Signaling Systems, and Communications | 2 |
| Lighting and Signs | 10 |
| Safety (29 CFR 1926) | 4 |
| Motors and Transformers | 6 |
| Total | 100 |
These counts are PSI's own. The bulletin lists subtopics under each area but no item counts for subtopics and no NEC article numbers. Up to 10 unscored experimental questions may be added; their time does not count against you, but you will not know which they are.
Same outline as the journeyman exam
If you studied for the Oklahoma Journeyman Electrician exam, this will look familiar. PSI prints the same 13 areas, the same counts and the same references for the unlimited journeyman exam, the Unlimited Electrical Contractor exam and the Limited Electrical Contractor exam. The contractor trade exam is not a harder Code test with business questions mixed in; the business material lives entirely on Business and Law.
That is why a passing trade score can be applied to a journeyman license within a year (OAC 158:40-9-2(c)).
Where the weight is
- Six areas carry 10 items each, and overcurrent protection carries 9. No single area is more than 10% of the exam, so you cannot pass on one chapter.
- General Knowledge (4) is the area with a contractor flavor: permits and inspections, structural integrity, and needs analysis and estimating.
- General Electrical Knowledge (10) is theory: series, parallel and combination circuits, power and heat lost in a circuit, single- and three-phase AC, cost of power and troubleshooting. It also folds in NEC definitions, temporary wiring, cranes and hoists, and elevators and escalators.
- Electrical Installation Requirements (10) includes installations over 600 volts, and Services, Feeders, and Branch Circuits (10) covers services over 600 volts, voltage drop, outside feeders, space-heating and snow-melting circuits, and air-conditioning and refrigeration equipment.
- Special Occupancies and Equipment (10) runs from Class I, II and III hazardous locations, garages and fuel dispensing, bulk storage and spray areas to health care, places of assembly, mobile homes and RV parks, floating buildings, and pools.
- Grounding and Bonding (10) names grounding electrode conductor and equipment grounding conductor sizing. Know Tables 250.66 and 250.122.
- Raceways and Boxes (7) has a long subtopic list, from rigid metal conduit through cable tray, conduit fill and box fill, for only 7 questions. Learn where the tables are.
- Low Voltage, Alarms, Signaling, and Communications is just 2 items.
On the 2023 NEC, as amended in Oklahoma
The exam tests NFPA 70, 2023 edition, "as revised and adopted by the Oklahoma Uniform Building Code Commission" (OUBCC), which Oklahoma exams have used since December 14, 2024. When two legal requirements conflict, the bulletin says the state-specific code overrides the national one. Oklahoma makes two changes to the Code's rule text, and both can change an answer:
| NEC section | Oklahoma change |
|---|---|
| 210.8(F), dwelling outdoor outlets | The exception that GFCI protection is not required for listed HVAC equipment is kept with no expiration date. In the national 2023 NEC it expired September 1, 2026. |
| 422.16(B)(5), gas-fired central furnaces (added) | A gas furnace supplying a dwelling unit may be cord-and-plug connected. The cord needs an equipment grounding conductor and a grounding-type plug, and may be no longer than 9 feet. |
None of the informative annexes is adopted. Annex C and Annex D are still printed in your book and handy for lookups, but they are not Oklahoma law.
What about the 2026 NEC?
There is no adoption or effective date for the 2026 NEC in Oklahoma yet. OUBCC's 2026 NEC Technical Review Committee held its first meeting on September 9, 2026, and nothing has been set since. When Oklahoma last changed editions, CIB gave a 90-day testing grace period: the 2023 NEC took effect September 14, 2024, and the exams switched on December 14, 2024. Until PSI publishes a new bulletin, study the 2023 edition.
A study plan built on the weights
- Theory first. Ten items, and Ugly's (any edition) has the formulas. Work Ohm's law, power, three-phase and cost-of-power problems until they are quick.
- Then the 10-item Code areas: installation requirements (Articles 110 and 300), services, feeders and branch circuits (Articles 210 through 230, plus 424, 426, 427 and 440), grounding and bonding (Article 250), lighting and signs (Articles 410, 411 and 600), and special occupancies (Chapter 5 and Article 680).
- Overcurrent protection (9), mostly Article 240.
- Conductors, raceways and boxes (15 combined). Practice conduit fill and box fill with Chapter 9 and Article 314.
- Motors and transformers (6), Articles 430 and 450.
- Safety (4) from 29 CFR 1926, permits and inspections for General Knowledge, and a quick pass over Chapters 7 and 8 for the 2 low-voltage items.
- Learn the two Oklahoma amendments cold. They are short and they flip answers.
- Tab and highlight your books. Permanent tabs, highlighting and underlining are allowed; writing in the books is not.
- Practice at exam pace. 100 questions in 4 hours is 2.4 minutes each.
Our free practice test gives you a feel for the questions on the 2023 NEC. The full Unlimited Electrical Contractor exam prep has full-length practice exams weighted to this outline, with every answer explained. For eligibility and fees, see Oklahoma Unlimited Electrical Contractor requirements; for the test itself, see exam day.
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