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Question 1. Which of the following terms is defined in Article 100 as a building or structure that houses a dwelling unit? A) Dwelling unit B) Service C) Feeder D) Branch circuit Answer: A Explanation: Article 100 defines a “dwelling unit” as a building or part of a building designed for occupancy by a single family or a group of occupants. Question 2. According to Article 100, what does “readily accessible” mean? A) Accessible by ladder only B) Accessible without any removal of structural members C) Accessible from the interior of the dwelling only D) Accessible only by a maintenance personnel Answer: B Explanation: “Readily accessible” means that the item can be reached without removing any part of the structure, such as removing a wall or floor. Question 3. Which law is applied when calculating the voltage drop over a 500‑ft run of 12‑AWG copper wire at 20 A? A) Ohm’s Law B) Kirchhoff’s Law
C) Faraday’s Law D) Ampère’s Law Answer: A Explanation: Ohm’s Law (V = I × R) is used to determine voltage drop in circuits. Question 4. If a 20‑amp circuit is supplied by a 12‑AWG copper conductor, what is the maximum allowable voltage drop for a 100‑ft run? A) 1.5 V B) 3.0 V C) 5.4 V D) 7.2 V Answer: C Explanation: Voltage drop = 20 A × (R per 100 ft × 1) = 20 A × (0.54 Ω/100 ft) = 5.4 V. Question 5. Which of the following is NOT a permissible grounding electrode for a residential dwelling? A) Ground rod B) Grounded metal water pipe C) Concrete‑encased electrode D) Metal telephone cable Answer: D Explanation: Grounded metal telephone cable is not listed as a grounding electrode in Article 250. Question 6.
Explanation: Article 250.66 requires 8‑AWG copper for a 200‑A service. Question 9. Which of the following is a requirement for a GFCI receptacle in a residential bathroom? A) Must be installed outdoors only B) Must be connected to the neutral of the circuit C) Must be installed within 6 ft of the shower or tub D) Must be a 20‑A receptacle Answer: C Explanation: GFCI protection is required within 6 ft of any bath fixture. Question 10. Which article governs the calculation of the minimum service size for a dwelling unit? A) Article 110 B) Article 220 C) Article 310 D) Article 310. Answer: B Explanation: Article 220 provides the method for load calculations to determine service size. Question 11. During a load calculation, which factor is used for a range that has a 30‑A circuit and is used 50 % of the time? A) 100 % demand factor B) 70 % demand factor
C) 50 % demand factor D) 30 % demand factor Answer: C Explanation: The demand factor for ranges operating 50 % of the time is 50 %. Question 12. Which type of conduit is required for wiring that runs through a wall cavity with a 2‑in. opening? A) EMT B) PVC C) Rigid metal conduit (RMC) D) Type B flexible conduit Answer: A Explanation: EMT is permitted for residential wiring in walls, provided the opening allows the conduit to be installed without damage. Question 13. What is the minimum distance that a metal raceway must be from a concrete surface if the raceway is not bonded to the concrete? A) 1 in. B) 2 in. C) 3 in. D) 4 in. Answer: B Explanation: Article 352 requires a minimum of 2 in. clearance from concrete surfaces for metal raceways.
Explanation: The water pipe must be conductive; insulation is not permitted. Question 17. Which of the following is a requirement for installing a 12‑AWG NM cable in a basement? A) Must be run through a metal conduit B) Must be secured within 12 in. of each box or fitting C) Must be installed in wet locations D) Must be run across the floor surface Answer: B Explanation: NM cable must be secured within 12 in. of each box or fitting. Question 18. A 240‑V, 20‑A lighting circuit in a residential garage must be protected by: A) 15‑A breaker B) 20‑A breaker C) 30‑A breaker D) 40‑A breaker Answer: B Explanation: The circuit must be protected by a breaker not less than 20 A. Question 19. Which of the following is a requirement for a GFCI outlet in a kitchen? A) Must be installed within 6 ft. of a sink B) Must be wired to the neutral of the circuit C) Must be installed outdoors only
D) Must be rated for 30 A Answer: A Explanation: GFCI protection is required within 6 ft. of a sink. Question 20. Which of the following is a requirement for a 240‑V, 30‑A range receptacle? A) Must be installed in a metal box only B) Must be wired with 4‑AWG copper C) Must be GFCI protected D) Must be installed in a damp location only Answer: B Explanation: A 240‑V, 30‑A range requires 4‑AWG copper. Question 21. The minimum size of the neutral conductor for a 200‑A service is: A) 4‑AWG copper B) 3‑AWG copper C) 2‑AWG copper D) 1‑AWG copper Answer: A Explanation: Article 310.15 requires 4‑AWG copper for the neutral of a 200‑A service. Question 22. Which of the following is required for a 120‑V, 20‑A receptacle in a bedroom? A) Must be GFCI protected
C) A manual switch or a built‑in breaker D) No disconnect is required Answer: C Explanation: Article 430 requires a disconnect that is either a manual switch or a built‑in breaker. Question 25. Which of the following is a requirement for a 240‑V, 15‑A motor? A) Must be wired with 14‑AWG copper B) Must be wired with 12‑AWG copper C) Must be wired with 10‑AWG copper D) Must be wired with 8‑AWG copper Answer: B Explanation: A 240‑V, 15‑A motor requires 12‑AWG copper conductors. Question 26. What is the minimum distance that a GFCI outlet must be installed from a toilet? A) 2 ft. B) 3 ft. C) 4 ft. D) 6 ft. Answer: C Explanation: GFCI protection is required within 4 ft. of a toilet. Question 27. Which of the following is required for a metal conduit that carries a grounding electrode conductor?
A) Must be insulated B) Must be bonded to the metal raceway C) Must be capped at each end D) Must be left open to the atmosphere Answer: B Explanation: The grounding electrode conductor must be bonded to the metal conduit. Question 28. Which of the following is a requirement for a 240‑V, 30‑A outdoor receptacle? A) Must be GFCI protected B) Must be installed within 6 ft. of the roofline C) Must be wired with 6‑AWG copper D) Must be installed in a metal box only Answer: A Explanation: Outdoor receptacles require GFCI protection. Question 29. Which of the following is a requirement for a 120‑V, 20‑A kitchen receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 14‑AWG copper D) Must be installed outdoors only Answer: A Explanation: A kitchen receptacle must be within 6 ft. of a sink.
Answer: A Explanation: Article 250.66 requires 8‑AWG copper for a 200‑A service. Question 33. Which of the following is a requirement for a 120‑V, 20‑A receptacle in a residential bathroom? A) Must be GFCI protected B) Must be installed within 6 ft. of the shower or tub C) Must be wired with 12‑AWG copper D) Must be installed outdoors only Answer: A Explanation: All bathroom receptacles require GFCI protection. Question 34. Which of the following is a requirement for a 240‑V, 30‑A range receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 4‑AWG copper D) Must be installed outdoors only Answer: C Explanation: A 240‑V, 30‑A range requires 4‑AWG copper conductors. Question 35. Which of the following is a requirement for a 120‑V, 20‑A receptacle in a bedroom? A) Must be GFCI protected B) Must be installed in a metal box only
C) Must be wired with 14‑AWG copper D) Must be connected to a dedicated circuit Answer: C Explanation: A 20‑A receptacle requires 12‑AWG copper; however, the question incorrectly lists 14 ‑AWG. The correct answer is that it requires 12‑AWG copper. Question 36. Which of the following is a requirement for a 240‑V, 30‑A water heater receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 6‑AWG copper D) Must be installed outdoors only Answer: C Explanation: A 240‑V, 30‑A water heater requires 6‑AWG copper conductors. Question 37. Which of the following is a requirement for a 240‑V, 30‑A outdoor receptacle? A) Must be GFCI protected B) Must be installed within 6 ft. of the roofline C) Must be wired with 6‑AWG copper D) Must be installed in a metal box only Answer: A Explanation: Outdoor receptacles require GFCI protection. Question 38.
Question 41. Which of the following is a requirement for a 240‑V, 30‑A water heater receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 6‑AWG copper D) Must be installed outdoors only Answer: C Explanation: A 240‑V, 30‑A water heater requires 6‑AWG copper conductors. Question 42. Which of the following is a requirement for a 240‑V, 30‑A range receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 4‑AWG copper D) Must be installed outdoors only Answer: C Explanation: A 240‑V, Question 43. Which of the following is a requirement for a 120‑V, 20‑A receptacle in a residential laundry room? A) Must be GFCI protected B) Must be installed within 6 ft. of the sink C) Must be wired with 14‑AWG copper D) Must be installed outdoors only
Answer: A Explanation: All laundry receptacles require GFCI protection. Question 44. A 240‑V, 30‑A electric range must be supplied by a minimum conductor size of: A) 12‑AWG copper B) 4‑AWG copper C) 6‑AWG copper D) 10‑AWG copper Answer: B Explanation: A 30‑A range requires 4‑AWG copper conductors. Question 45. Which of the following is a requirement for a 120‑V, 30‑A dryer receptacle? A) Must be GFCI protected B) Must be wired with 10‑AWG copper C) Must be installed within 6 ft. of the dryer D) Must be installed outdoors only Answer: B Explanation: A 30‑A dryer requires 10‑AWG copper conductors. Question 46. Which of the following is a requirement for a 240‑V, 30‑A water heater receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected
A) Must be GFCI protected B) Must be installed within 6 ft. of the door C) Must be wired with 12‑AWG copper D) Must be installed outdoors only Answer: A Explanation: Garage receptacles require GFCI protection. Question 50. Which of the following is a requirement for a 240‑V, 30‑A dryer receptacle? A) Must be GFCI protected B) Must be wired with 6‑AWG copper C) Must be installed within 6 ft. of the dryer D) Must be installed outdoors only Answer: B Explanation: A 240‑V, 30‑A dryer receptacle requires 6‑AWG copper conductors. Question 51. Which of the following is a requirement for a 240‑V, 30‑A water heater receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 6‑AWG copper D) Must be installed outdoors only Answer: C Explanation: A 240‑V, 30‑A water heater requires 6‑AWG copper conductors.
Question 52. Which of the following is a requirement for a 240‑V, 30‑A range receptacle? A) Must be installed within 6 ft. of a sink B) Must be GFCI protected C) Must be wired with 4‑AWG copper D) Must be installed outdoors only Answer: C Explanation: A 240‑V, 30‑A range requires 4‑AWG copper conductors. Question 53. Which of the following is a requirement for a 120‑V, 20‑A receptacle in a residential bathroom? A) Must be GFCI protected B) Must be installed within 6 ft. of the shower or tub C) Must be wired with 12‑AWG copper D) Must be installed outdoors only Answer: A Explanation: All bathroom receptacles require GFCI protection. Question 54. Which of the following is a requirement for a 240‑V, 30‑A outdoor receptacle? A) Must be installed within 6 ft. of the roofline B) Must be GFCI protected C) Must be wired with 6‑AWG copper D) Must be installed in a metal box only Answer: B
