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Question 1. Which of the following equations correctly represents Ohm’s Law for a resistive AC circuit? A) V = I × R B) P = V × I C) I = √(V² + R²) D) V = I + R Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R) for both DC and resistive AC circuits. Question 2. In NEC Article 100, the term “grounded conductor” refers to which conductor? A) The equipment grounding conductor B) The neutral conductor that is intentionally connected to ground at the service point C) Any conductor that is bonded to the grounding electrode system D) The ungrounded (hot) conductor Answer: B Explanation: The grounded conductor is the neutral that is connected to the grounding electrode at the service disconnect, providing a return path for current. Question 3. A 240‑V single‑phase motor requires a starting current of 5 times its full‑load current. Which overcurrent device is most appropriate for protecting this motor? A) Standard inverse‑time circuit breaker rated at full‑load current B) Non‑time‑delay (instantaneous) fuse sized at full‑load current C) Time‑delay (inverse‑time) circuit breaker rated at 125 % of full‑load current D) No overcurrent device is required for motors Answer: C Explanation: Motors need a time‑delay (inverse‑time) protective device sized at 125 % of full‑load current to allow the high inrush without nuisance tripping.
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Question 4. When calculating voltage drop for a 100‑ft run of 12 AWG copper conductor feeding a 120 ‑V receptacle, which factor is NOT considered? A) Conductor resistance per foot B) Load current C) Power factor of the load D) Ambient temperature above 30 °C Answer: D Explanation: Ambient temperature affects ampacity, not voltage‑drop calculations, which use resistance, current, and power factor. Question 5. According to NEC 2023 Table 310.15(B)(16), what is the ampacity of 4 AWG aluminum XHHW‑2 conductors rated for 75 °C? A) 55 A B) 65 A C) 70 A D) 85 A Answer: C Explanation: Table 310.15(B)(16) lists 4 AWG aluminum XHHW‑2 at 70 A for 75 °C insulation. Question 6. Which of the following is a required label for a circuit breaker installed in a residential panel? A) Manufacturer’s serial number only B) Voltage rating, amperage rating, and breaker type C) Length of the branch circuit conductors D) Date of installation Answer: B Explanation: NEC 110.22 requires identification of voltage, amperage, and type (e.g., single‑pole, GFCI) on circuit breakers.
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Answer: B Explanation: NEC 250.66 requires a minimum of 8 AWG copper or 6 AWG aluminum for a typical residential grounding electrode conductor. Question 10. Which of the following is NOT a permissible grounding electrode under NEC 250.52? A) Concrete‑encased electrode (Ufer) B) Metal water pipe in direct contact with the earth for at least 10 ft C) Grounding electrode rod of 8 ft length D) Underground metal raceway that does not contain a conductor Answer: D Explanation: An underground metal raceway without a conductor is not listed as an acceptable grounding electrode. Question 11. The equipment grounding conductor (EGC) for a 20‑A branch circuit using 12 AWG THHN copper must be at minimum: A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: A Explanation: NEC 250.122 requires the EGC to be at least 14 AWG copper for a 20‑A circuit. Question 12. In a commercial building, a metal conduit that serves as an equipment grounding conductor must be bonded at which locations? A) Only at the service entrance B) At each end of the conduit run and at any junction boxes C) Only at the farthest point from the service equipment D) Bonding is not required for metal conduit Answer: B
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Explanation: NEC 250.118 requires bonding at each end of the conduit and at any boxes where the conduit is interrupted. Question 13. Which NEC article governs the installation of GFCI protection for receptacles in a laundry room? A) Article 210.8(A)(2) B) Article 210.11(C)(1) C) Article 210.52(B) D) Article 210.70(A) Answer: A Explanation: NEC 210.8(A)(2) requires GFCI protection for receptacles serving laundry areas. Question 14. A Class I, Division 2 hazardous location requires which type of wiring method? A) Type NM cable B) Rigid metal conduit (RMC) only C) Explosion‑proof (Ex) raceways or approved cable assemblies D) Flexible metal conduit (FMC) without a listed rating Answer: C Explanation: Hazardous locations must use equipment rated for the specific class and division; explosion‑proof raceways or listed cable assemblies are required for Class I, Division 2. Question 15. For a hospital operating room, which wiring method is mandated by NEC 517.12? A) NM‑B cable B) MC‑H cable only C) Rigid metal conduit or intermediate metal conduit with proper grounding D) PVC conduit without bonding Answer: C Explanation: NEC 517.12 requires rigid or intermediate metal conduit for wiring in operating rooms to provide protection and grounding.
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Explanation: Power‑limited circuits are limited to 30 V and 5 A (or 30 V and 10 A for certain equipment) per NEC 760.41. Question 19. In a Class 2 remote‑control circuit, the maximum voltage permitted is: A) 30 V B) 60 V C) 100 V D) 120 V Answer: B Explanation: NEC 725.41 limits Class 2 circuits to 30 V DC or 60 V AC. Question 20. Which of the following communication cabling types must be installed in a conduit when used in a wet location? A) Unshielded twisted‑pair (UTP) cable B) Plenum‑rated (CMP) fiber optic cable C) Riser‑rated (CMR) coaxial cable D) Any of the above, provided the conduit is rated for wet locations Answer: D Explanation: NEC 770.53 allows any communication cable to be installed in a conduit in wet locations as long as the conduit is appropriate for the environment. Question 21. OSHA standard 29 CFR 1926.502(b)(13) requires which PPE when working on energized parts rated over 100 V? A) Hard hat only B) Insulated gloves and dielectric footwear C) Safety glasses only D) Hearing protection Answer: B
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Explanation: OSHA mandates insulated gloves and dielectric footwear for live work on circuits over 100 V to protect against electrical shock. Question 22. NFPA 70E defines “Arc‑Flash Hazard Boundary” as the distance at which a worker could receive a second‑degree burn. Which factor does NOT affect the boundary calculation? A) System voltage B) Available fault current C) Duration of the arc D) Color of the conductor insulation Answer: D Explanation: The color of insulation has no impact on arc‑flash energy; voltage, fault current, and clearing time are the critical variables. Question 23. Under the lockout/tagout (LOTO) standards, which of the following is the correct sequence for de‑energizing a circuit? A) Isolate → Lock → Verify → Tag B) Verify → Isolate → Tag → Lock C) Isolate → Verify → Lock → Tag D) Tag → Lock → Isolate → Verify Answer: C Explanation: The LOTO procedure requires isolation, verification of de‑energization, then applying lock and tag devices. Question 24. In Alabama, the minimum workers’ compensation insurance coverage for an electrical contractor with 5 employees is: A) $100,000 per employee B) $500,000 aggregate per incident C) No minimum; state law sets coverage based on payroll D) $1,000,000 per occurrence
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D) Personal vacation expenses of the owner Answer: D Explanation: Personal vacation costs are unrelated to project expenses and should not be part of a construction bid. Question 28. Under NEC 210.12, Arc‑Fault Circuit‑Interrupter (AFCI) protection is required for which of the following areas in a dwelling? A) Garages only B) All 120‑V, 15‑ and 20‑A branch circuits supplying outlets in bedrooms, living rooms, and dining rooms C) Outdoor receptacles D) Dedicated appliance circuits Answer: B Explanation: NEC 210.12 mandates AFCI protection for all 120‑V, 15‑ and 20‑A circuits supplying outlets in most living areas of a dwelling. Question 29. Which NEC article specifies the requirements for conduit fill for flexible metal conduit (FMC)? A) 300. B) 358. C) 376. D) 410. Answer: B Explanation: NEC 358 covers Flexible Metal Conduit, and 358.12 provides the conduit‑fill tables. Question 30. The maximum number of 14‑AWG THHN conductors that may be installed in a 3/4‑in. EMT conduit (using the 40 % fill rule) is: A) 6 B) 8 C) 10
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D) 12
Answer: B Explanation: EMT 3/4‑in. has an internal area of 0.533 in². 14‑AWG THHN has an approximate area of 0.013 in². 40 % fill allows 0.213 in², which accommodates about 16 conductors, but NEC limits to 8 for sizes 14 AWG and larger. Therefore the answer is 8. Question 31. A pull box must be installed when a conduit changes direction more than: A) 30° B) 45° C) 90° D) 180° Answer: B Explanation: NEC 300.15 requires a pull box when a conduit changes direction more than 45°. Question 32. For a residential branch circuit feeding a 20‑A receptacle, the minimum size of the grounding conductor in a metal raceway is: A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: A Explanation: NEC 250.122 permits a 14 AWG copper EGC for a 20‑A circuit when the raceway is metal and serves as an equipment grounding path. Question 33. In a commercial building, a 30‑A, 125‑V circuit supplies a commercial kitchen range. Which protective device is required at the point of branch‑circuit termination? A) Standard circuit breaker B) GFCI breaker C) AFCI breaker
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D) Half the size of the largest ungrounded conductor Answer: A Explanation: NEC 230.42 requires the neutral to be the same size as the ungrounded conductors for a single‑phase service. Question 37. Which NEC article governs the installation of fiber‑optic cables in commercial buildings? A) Article 770 B) Article 800 C) Article 820 D) Article 830 Answer: A Explanation: NEC 770 covers optical fiber cable installation. Question 38. A transformer secondary is grounded by connecting the secondary neutral to: A) The equipment grounding conductor only B) The grounding electrode system only C) Both the equipment grounding conductor and the grounding electrode system D) Neither; the secondary is never grounded Answer: C Explanation: NEC 250.30 requires the transformer secondary neutral to be bonded to both the equipment grounding conductor and the grounding electrode system. Question 39. Under the Alabama Mechanic’s Lien Act, a preliminary notice must be filed within how many days after furnishing labor or materials? A) 30 days B) 45 days C) 60 days D) 90 days
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Answer: B Explanation: Alabama Code § 8‑ 7 ‑19 requires a preliminary notice within 45 days of first furnishing labor or materials. Question 40. Which of the following is a correct statement about the “critical path” in project scheduling? A) It is the longest sequence of activities that determines the minimum project duration B) It is the shortest path through the network diagram C) It includes only activities that have zero float D) Both A and C are correct Answer: D Explanation: The critical path is the longest duration path and consists of activities with zero float. Question 41. In a commercial office, the minimum number of grounding conductors required for a 4 ‑wire feeder (three hots, neutral, ground) is: A) One grounding conductor B) Two grounding conductors (one per phase) C) One per ungrounded conductor D) None, if the conduit is metal Answer: A Explanation: NEC 250.122 requires a single equipment grounding conductor for a 4‑wire feeder, regardless of the number of hots. Question 42. Which of the following statements about the NEC “adjustment factors” for conduit fill is FALSE? A) The 40 % fill limit applies to more than two conductors in a raceway B) The 53 % fill limit applies to a single conductor in a raceway C) The 31 % fill limit applies to more than three conductors in a conduit D) The 31 % fill limit applies to a single cable assembly in a conduit
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D) Article 680 Answer: A Explanation: NEC 517 covers health‑care facilities, including hospitals and clinics. Question 46. The NEC requires that a conduit system serving a hazardous (Class I) location be made of: A) Any material, as long as it is electrically conductive B) Rigid metal conduit (RMC) only C) A material listed for the specific hazardous classification D) PVC conduit only Answer: C Explanation: NEC 500.10 requires that raceways in hazardous locations be listed for the specific class/division. Question 47. When using a metal‑clad cable (MC) in a residential attic, the cable must be protected from physical damage by: A) Running the cable through PVC conduit the entire length B) Installing the cable within 1‑½ in. of the nearest joist edge C) Using a metal plate or guard where the cable is less than 1 ft from the nearest edge of the framing member D) No protection is required in attics Answer: C Explanation: NEC 334.15(C) requires a protective plate or guard when MC cable is within 1 ft of the edge of framing members. Question 48. Which of the following is the correct method for calculating box fill for a device (e.g., a receptacle) with two yokes? A) Count each yoke as one conductor B) Count each yoke as two conductors
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C) Count each yoke as three conductors D) Device yokes are not counted in box‑fill calculations Answer: B Explanation: NEC 314.16(B) counts each yoke (or strap) as two conductors for box‑fill purposes. Question 49. Under NFPA 70E, the minimum arc‑flash PPE for a task with an incident energy of 8 cal/cm² is: A) Category 1 (basic) B) Category 2 (secondary) C) Category 3 (intermediate) D) Category 4 (advanced) Answer: B Explanation: NFPA 70E Table 130.7(C) assigns Category 2 PPE for incident energies between 8 and 25 cal/cm². Question 50. A contractor wishes to use a “lump‑sum” contract for a commercial renovation. Which of the following is a primary advantage of this contract type? A) The owner pays only for actual costs incurred B) The contractor assumes the risk of cost overruns, simplifying budgeting for the owner C) It allows unlimited changes without renegotiation D) It eliminates the need for a detailed scope of work Answer: B Explanation: Lump‑sum contracts place cost‑overrun risk on the contractor, providing a fixed price for the owner. Question 51. Which of the following items must be included on a contractor’s invoice to satisfy Alabama state tax reporting? A) Contractor’s Social Security number only B) Detailed description of labor, materials, and applicable state sales tax amount
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B) A trench deeper than 5 ft with limited means of entry C) An open outdoor work area D) A stairwell with two exits Answer: B Explanation: OSHA defines a confined space as a partially enclosed area with limited entry/exit; a deep trench qualifies. Question 55. Which NEC article governs the installation of lighting fixtures in hazardous (Class II) locations? A) Article 500 B) Article 517 C) Article 600 D) Article 410 Answer: A Explanation: Article 500 covers hazardous (Class I, II, III) locations, including lighting requirements. Question 56. When installing a standby generator with a 200 A transfer switch, the feeder conductors must be sized for at least what percentage of the transfer switch rating? A) 100 % B) 125 % C) 150 % D) 175 % Answer: A Explanation: NEC 702.10 requires feeder conductors to be sized for the full rating of the transfer switch (100 % of the rating). Question 57. Which of the following is the correct method for grounding a metal‑clad cable (MC) that is installed in a raceway? A) No grounding is required because the MC cable has an internal grounding sheath
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B) Bond the metal armor to the equipment grounding conductor at each box C) Install a separate grounding conductor in the raceway D) Use a grounding screw at the panel only Answer: B Explanation: NEC 250.118 requires bonding the metal armor of MC cable to the equipment grounding conductor at each enclosure. Question 58. In a residential garage, the minimum ampacity for a dedicated 20‑A receptacle circuit that supplies a portable air‑compressor is: A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: The circuit must be rated at least equal to the receptacle’s rating; a 20‑A receptacle requires a 20‑A circuit. Question 59. Which of the following statements about “adjustment factors” for conduit fill is correct? A) Adjustment factors increase the allowable number of conductors in a conduit B) Adjustment factors are applied only when the conduit is installed in a wet location C) Adjustment factors are used to compensate for temperature derating of conductors D) Adjustment factors are not used for conductors larger than 4 AWG Answer: C Explanation: Adjustment factors (NEC 310.15(B)(2)(a)) are applied to reduce ampacity based on ambient temperature and conductor count. Question 60. A contractor’s “cash flow” statement primarily shows: A) Revenue earned versus expenses incurred during a fiscal year
