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Question 1. Which entity has the ultimate authority to adopt and enforce the electrical code in Wyoming? A) Wyoming Department of Transportation B) Wyoming Electrical Board C) Local city council D) Federal Energy Regulatory Commission Answer: B Explanation: The Wyoming Electrical Board is the state agency responsible for adopting and enforcing the NEC and related regulations. Question 2. In Wyoming, a journeyman electrician must supervise apprentices at a minimum ratio of: A) 1 journeyman to 1 apprentice B) 1 journeyman to 2 apprentices C) 1 journeyman to 3 apprentices D) 1 journeyman to 5 apprentices Answer: C Explanation: State law requires one licensed journeyman to directly supervise no more than three apprentices at a time. Question 3. Which of the following is NOT a ground electrode permitted by NEC Article 250 in Wyoming? A) Concrete‑encased electrode B) Grounding rod of 5 ft minimum length C) Metal underground water pipe without a protective sleeve D) Grounding plate buried at least 2 ft deep Answer: C Explanation: Underground metal water pipes must be protected from corrosion; if they are not, they cannot serve as a grounding electrode unless bonded. Question 4. The current edition of the NEC adopted by Wyoming as of 2024 is:
A) 2014 NEC
B) 2017 NEC
C) 2020 NEC
D) 2023 NEC
Answer: D Explanation: Wyoming updated its code adoption to the 2023 edition of the National Electrical Code. Question 5. According to NEC Article 100, “continuous load” is defined as a load that: A) Operates for more than 3 hours continuously B) Operates for at least 8 hours per day C) Operates at full rating for 3 hours or more D) Operates intermittently throughout the day Answer: C Explanation: A continuous load is one that is expected to run for three hours or more at its full rated current. Question 6. Ohm’s Law for a single‑phase AC circuit is expressed as: A) V = I × R B) P = V × I × cos φ C) Both A and B D) None of the above Answer: C Explanation: V = I R applies to voltage, current, and resistance; power in AC also includes the power factor term. Question 7. A 120 V, 15 A branch circuit supplies a kitchen countertop receptacle. What is the minimum size of the grounding‑equipment conductor (GEC) required? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper
Answer: D Explanation: Overcurrent protection must not be less than the feeder load; the next standard size above 40 A is 45 A, but 50 A is used to allow for the 125 % rule for continuous loads. Question 11. In Wyoming, who is authorized to pull an electrical permit for a residential remodel? A) Any homeowner B) Licensed contractor only C) Licensed journeyman electrician only D) Either a licensed contractor or a homeowner for a single‑family dwelling Answer: D Explanation: Wyoming permits allow homeowners to pull permits for single‑family dwellings, but contractors may also pull permits. Question 12. The required minimum clearance in front of a service disconnecting means in a residential setting is: A) 3 ft B) 30 in C) 36 in D) 42 in Answer: C Explanation: NEC 230.71 requires a minimum of 36 in of clear working space in front of service disconnects. Question 13. Which of the following is the correct definition of “dwelling unit” per NEC Article 100? A) Any building used for residential occupancy B) A single unit that provides complete living facilities for one or more persons C) A multifamily building with at least two separate units D) A temporary structure used for housing workers Answer: B Explanation: A dwelling unit is a single unit providing complete living facilities for one or more persons.
Question 14. For a 240‑V, 30‑A dryer circuit, which type of receptacle is required? A) NEMA 5‑15R B) NEMA 6‑20R C) NEMA 14‑30R D) NEMA 14‑50R Answer: C Explanation: Dryers require a four‑prong, 240‑V, 30‑A receptacle (NEMA 14‑30R). Question 15. When sizing a feeder conductor for a 100‑amp service in a commercial building, which factor must be considered according to NEC 310.15(B)(3)(a)? A) Ambient temperature correction B) Number of conductors in a raceway C) Both A and B D) Neither A nor B Answer: C Explanation: Both ambient temperature and conductor bundling adjustments affect ampacity. Question 16. The NEC permits the use of flexible metal conduit (FMC) for which of the following applications? A) Exposed outdoor run longer than 6 ft B) Direct burial without protection C) As a raceway for branch circuits inside walls D) As a permanent support for heavy equipment Answer: C Explanation: FMC can be used as a raceway for branch circuits inside walls, provided it is supported and secured per Article 358. Question 17. Which of the following devices must be listed as “tamper‑resistant” in a dwelling unit built after 2008?
C) 4 AWG copper D) 2 AWG copper Answer: B Explanation: Table 250.66 requires a 6 AWG copper GEC for a 200‑A service. Question 21. A motor rated 5 hp, 460 V, 3‑phase, 60 Hz requires a full‑load current of approximately: A) 5 A B) 8 A C) 12 A D) 15 A Answer: C Explanation: NEC Table 430.250 lists a 5 hp, 460 V, 3‑phase motor with a full‑load current of about 12 A. Question 22. For a 30‑A branch circuit supplying a bathroom receptacle, the required AFCI protection is: A) Not required B) Required only for new construction after 2017 C) Required for all 15‑ and 20‑A circuits in dwelling units D) Required only for lighting circuits Answer: C Explanation: NEC 210.12(A) requires AFCI protection for all 15‑ and 20‑A circuits supplying outlets in dwelling unit bedrooms, living areas, and also for bathroom receptacles. Question 23. Which of the following is the correct minimum burial depth for a non‑metallic sheathed cable (NM‑B) in a residential driveway? A) 6 in B) 12 in C) 18 in D) 24 in
Answer: B Explanation: NEC 334.15(B) requires a minimum of 12 in of cover for NM cable buried under a driveway. Question 24. The NEC defines a “separately derived system” as a system that: A) Has a neutral tied to the grounding electrode system at the source only B) Is supplied by a transformer whose secondary is not directly connected to the service neutral C) Shares a neutral with the service conductors D) Uses a generator as the primary source Answer: B Explanation: A separately derived system has a source of energy (e.g., a transformer) with no direct connection to the service neutral. Question 25. When performing a box‑fill calculation, each internal metal screw or clamp counts as: A) One conductor of the largest gauge present B) One volume unit equal to one 6 AWG conductor C) One volume unit equal to one 12 AWG conductor D) No volume; they are ignored Answer: C Explanation: NEC 314.16(B) states that each internal clamp or screw counts as one conductor of the largest size present, but for volume calculations it is treated as a 12 AWG conductor. Question 26. A photovoltaic (PV) array rated at 300 V DC and 10 A must have a maximum overcurrent protective device (OCPD) rated at: A) 10 A B) 15 A C) 20 A D) 30 A Answer: B Explanation: NEC 690.9(A) requires the OCPD to be rated at not less than the array’s maximum current and not more than 125 % of that current; 10 A × 1.25 = 12.5 A, so the next standard size is 15 A.
A) Not permitted; only receptacles may provide GFCI protection in bathrooms B) Permitted, provided the breaker is listed for GFCI use C) Permitted only for lighting circuits, not receptacles D) Permitted only if the circuit also supplies a kitchen countertop Answer: B Explanation: NEC 210.8(A)(1) allows GFCI protection by a GFCI breaker listed for the purpose. Question 31. In a commercial garage, the required minimum rating for lighting circuits is: A) 15 A B) 20 A C) 30 A D) 40 A Answer: B Explanation: NEC 210.11(C)(4) requires a minimum of 20 A for lighting circuits in commercial garages. Question 32. Which of the following is a permitted use of a flexible cord (Article 400) in a dwelling unit? A) As a permanent branch circuit wiring B) For a portable lamp C) To feed a fixed appliance without a listed cord set D) For outdoor burial Answer: B Explanation: Flexible cords may be used for portable equipment, such as lamps, but not as permanent wiring. Question 33. The maximum allowable voltage drop for feeder conductors serving a single‑family dwelling is: A) 2 % B) 3 % C) 5 %
D) 10 %
Answer: B Explanation: NEC 210.19(A)(1) limits feeder voltage drop to 3 % for a single‑family dwelling. Question 34. When installing a grounding electrode system for a new residential service, which of the following is the most economical and commonly used electrode? A) Grounding plate buried 8 ft deep B) 8‑ft copper‑clad grounding rod C) Grounding ring around the foundation D) Concrete‑encased electrode (Ufer) Answer: B Explanation: An 8‑ft copper‑clad grounding rod is inexpensive, easy to install, and widely used. Question 35. A 240‑V, 30 A, single‑phase air‑conditioning unit requires which of the following disconnecting means? A) A 30 A, 2‑pole breaker located within 6 ft of the unit B) A fused disconnect of any rating C) A 50 A, 2‑pole breaker located anywhere in the building D) No disconnect is required if the unit is hard‑wired Answer: A Explanation: NEC 440.14 requires a disconnecting means not exceeding the rating of the unit and located within sight distance (typically within 6 ft). Question 36. The minimum conduit fill for a single 4 AWG THHN conductor in EMT is: A) 40 % B) 53 % C) 31 % D) 100 % Answer: B
Question 40. Which article of the NEC governs the installation of raceways such as EMT, RMC, and PVC? A) Article 300 B) Article 358 C) Article 376 D) Article 410 Answer: B Explanation: NEC Article 358 covers Electrical Metallic Tubing (EMT); RMC is covered by Article 376, but the question asks for raceways generally, which is covered under Article 358 for EMT and related sections. Question 41. The NEC permits the use of a 30‑A GFCI breaker to protect a 20‑A bathroom circuit. This is: A) Allowed, as long as the breaker is listed for GFCI protection B) Not allowed; the breaker rating must match the circuit rating C) Allowed only if the breaker is a two‑pole type D) Not allowed; GFCI protection must be provided at the receptacle Answer: A Explanation: A larger‑rated GFCI breaker can protect a smaller circuit, provided the downstream conductors are protected by the circuit’s overcurrent device. Question 42. Which of the following is a required feature of a receptacle installed in a kitchen countertop area? A) GFCI protection only B) AFCI protection only C) Both GFCI and AFCI protection D) Neither GFCI nor AFCI protection is required Answer: C Explanation: NEC 210.8(A)(6) requires GFCI, and NEC 210.12(A) requires AFCI protection for kitchen countertop receptacles.
Question 43. The minimum clearance between a service entrance conductor and a grounded metal water pipe is: A) 1 in B) 2 in C) 3 in D) No clearance required if the pipe is bonded Answer: B Explanation: NEC 250.68(A) requires a minimum of 2 in clearance between the service entrance conductors and grounded metal water piping unless the pipe is part of the grounding electrode system. Question 44. When installing a grounding electrode conductor (GEC) made of aluminum, the minimum size for a 100‑A service is: A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: C Explanation: Table 250.66 shows that a 4 AWG aluminum GEC is required for a 100‑A service. Question 45. In a hazardous (Class I) location, the wiring method required for a lighting circuit is: A) NM‑B cable B) Rigid metal conduit (RMC) only C) Listed explosion‑proof raceway and fittings D) Flexible metal conduit (FMC) without any special rating Answer: C Explanation: Class I hazardous locations require explosion‑proof (ex‑d) raceways and fittings per Articles 500 ‑504. Question 46. The required minimum size of a grounding‑electrode conductor for a 400‑A service using a concrete‑encased electrode (Ufer) is:
B) GFCI receptacle or GFCI breaker C) AFCI receptacle only D) No special device required Answer: B Explanation: NEC 210.8(A)(1) mandates GFCI protection for bathroom receptacles. Question 50. The NEC permits the use of a 12‑AWG copper conductor for a 20‑A branch circuit if the conductor is: A) THHN in a conduit B) NM‑B cable C) UF cable D) All of the above Answer: D Explanation: 12‑AWG copper is rated for 20 A in most applications, whether in conduit (THHN), NM‑B, or UF cable, per Table 310.15(B)(16). Question 51. Which NEC article governs the installation of equipment grounding conductors? A) Article 250 B) Article 210 C) Article 300 D) Article 430 Answer: A Explanation: Article 250 covers grounding and bonding, including equipment grounding conductors. Question 52. For a residential dwelling, the minimum number of required 20‑A small‑appliance circuits in the kitchen is: A) One B) Two C) Three D) Four
Answer: B Explanation: NEC 210.11(C)(1) requires at least two 20‑A small‑appliance branch circuits for the kitchen. Question 53. A 250‑V, 15‑A receptacle installed outdoors must be: A) GFCI protected only B) Weather‑proof (in-use) rated C) AFCI protected only D) Both GFCI and AFCI protected Answer: B Explanation: Outdoor receptacles must be weather‑proof and rated for in‑use protection per NEC 406.9(A). Question 54. Which of the following is NOT a permissible method for grounding a metal conduit that is used as an equipment grounding conductor? A) Using a bonding jumper inside the conduit B) Relying on the metal conduit itself when installed per code C) Adding a separate grounding wire in the conduit D) Using a plastic conduit as the grounding path Answer: D Explanation: Plastic conduit cannot serve as an equipment grounding conductor. Question 55. The required minimum size of a feeder conductor to supply a 30 A, 240‑V air‑conditioning unit, assuming a 125 % load factor, is: A) 10 AWG copper B) 8 AWG copper C) 6 AWG copper D) 4 AWG copper Answer: B Explanation: 30 A × 1.25 = 37.5 A; Table 310.15(B)(16) shows 8 AWG copper is rated for 40 A at 75 °C.
C) Article 352 D) Article 334 Answer: D Explanation: UF cable is covered under Article 340 (though NM‑B is Article 334, UF is specifically Article 340). Question 60. A 3‑phase, 480 V motor with a full‑load current of 30 A requires a branch‑circuit overcurrent protective device (OCPD) of at least: A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: NEC 430.52 requires the OCPD to be sized at 125 % of the motor’s full‑load current for inverse‑time circuit breakers: 30 A × 1.25 = 37.5 A, rounded up to 40 A. Question 61. In a dwelling unit, the minimum number of receptacles required in a hallway that is 12 ft long is: A) One B) Two C) Three D) Four Answer: B Explanation: NEC 210.52(D) requires receptacles in hallways at intervals not exceeding 6 ft, so a 12‑ft hallway needs at least two receptacles. Question 62. The maximum number of conductors allowed in a ½‑in. EMT conduit for 12 AWG THHN conductors is: A) 9 B) 12 C) 15
D) 18
Answer: B Explanation: Using Table 1 of Chapter 9, ½‑in. EMT has an internal area of 0.304 in²; 12 AWG THHN occupies 0.0133 in². 53 % fill allows 12 conductors. Question 63. Which of the following devices is required to be installed on all 120‑V, 15‑A receptacles in a garage? A) AFCI breaker only B) GFCI receptacle or GFCI breaker only C) Both AFCI and GFCI protection D) No special protection required Answer: B Explanation: NEC 210.8(A)(2) requires GFCI protection for garage receptacles; AFCI is not required. Question 64. The NEC defines “readily accessible” as: A) Able to be reached without the use of tools B) Able to be reached without removing any part of the building structure C) Able to be reached by a person with normal physical ability D) Able to be reached without the use of a ladder Answer: A Explanation: “Readily accessible” means capable of being reached quickly and without the use of tools or a ladder (NEC 100). Question 65. For a 120‑V, 20‑A kitchen countertop receptacle, the required grounding conductor size is: A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B
