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Question 1. What is the formula for Ohm’s Law? A) V = I × R B) P = V × I C) I = V / R² D) R = V + I Answer: A Explanation: Ohm’s Law states voltage equals current multiplied by resistance (V = I·R). Question 2. In a three‑phase wye‑connected system, the line voltage is A) Equal to the phase voltage B) √3 times the phase voltage C) Half the phase voltage D) √2 times the phase voltage Answer: B Explanation: Line voltage = √3 × phase voltage for a wye connection. Question 3. Which NEC article governs grounding of electrical systems? A) 250 B) 300 C) 210 D) 430 Answer: A Explanation: Article 250 covers grounding and bonding requirements.
Question 4. The minimum size copper grounding electrode conductor for a 100‑A service is A) #10 AWG B) #8 AWG C) #6 AWG D) #4 AWG Answer: B Explanation: Table 250.66 specifies #8 AWG copper for up to 100 A. Question 5. A 120‑V, 15‑A branch circuit using NM‑B cable requires a minimum conductor size of A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: B Explanation: NEC 210.19(A)(1) requires #12 AWG copper for 20‑A, but 15‑A circuits may use #14; however NM‑B must be sized for the breaker, so #12 is used for future expansion and voltage drop considerations. Question 6. Which device provides protection against both arc‑fault and ground‑fault currents? A) GFCI B) AFCI C) Dual‑function AFCI/GFCI D) Surge protector Answer: C Explanation: Dual‑function devices combine AFCI and GFCI protection.
Explanation: Vermont Statutes Annotated 26 V.S.A. Chapter 15 governs electrical licensing. Question 10. Which of the following is a permitted use for Type NM cable? A) In wet locations B) Inside metal conduit exposed to corrosion C) In concealed walls of residential dwellings D) As feeder in a commercial garage Answer: C Explanation: NM cable is allowed in dry, concealed residential applications. Question 11. The required clearance in front of a panelboard rated 600 V or less is A) 30 in. B) 36 in. C) 42 in. D) 48 in. Answer: B Explanation: NEC 110.26(A)(1) mandates a minimum 36‑in. front working space. Question 12. A receptacle installed in a bathroom must be A) 15‑A, 125‑V GFCI protected B) 20‑A, 125‑V non‑GFCI C) 15‑A, 250‑V GFCI protected D) 20‑A, 250‑V non‑GFCI Answer: A
Explanation: NEC 210.8(A)(1) requires GFCI protection for bathroom receptacles. Question 13. The ampacity of #4 AWG copper THHN in 75 °C insulation is A) 55 A B) 70 A C) 85 A D) 95 A Answer: D Explanation: Table 310.15(B)(16) lists 95 A for #4 AWG at 75 °C. Question 14. Which NEC article addresses the installation of photovoltaic (PV) systems? A) 690 B) 705 C) 710 D) 725 Answer: A Explanation: Article 690 covers PV system requirements. Question 15. A 240‑V, 30‑A dryer circuit must be protected by a A) 20‑A breaker B) 30‑A breaker C) 40‑A breaker D) 50‑A breaker Answer: B
Explanation: Table 250.66 lists 1/0 AWG copper for 350‑ 400 A services. Question 19. In a three‑phase, 4‑wire wye system, the neutral conductor carries A) Only unbalanced current B) Full line current C) No current D) Twice the line current Answer: A Explanation: The neutral carries only the vector sum of unbalanced phase currents. Question 20. The NEC permits a single‑pole 15‑A GFCI receptacle to protect A) Only itself B) Downstream receptacles on the same branch circuit C) All circuits in the panel D) Only the upstream device Answer: B Explanation: A GFCI receptacle can protect downstream outlets on the same circuit. Question 21. Which of the following is NOT a permitted location for a disconnecting means for a motor? A) Inside the motor’s enclosure B) At the nearest point of power entry C) In a separate panelboard D) On the same wall as the motor
Answer: A Explanation: NEC 430.102 requires the disconnect to be outside the motor enclosure. Question 22. The required minimum height for a receptacle in a garage is A) 12 in. above the floor B) 18 in. above the floor C) 24 in. above the floor D) No specific height Answer: B Explanation: NEC 210.52(G) requires receptacles in garages to be installed not less than 18 in. above the floor. Question 23. For a 125‑V, 20‑A circuit, the minimum size copper conductor is A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: B Explanation: #12 AWG copper is rated for 20 A per NEC 240.4(D). Question 24. Which NEC article governs the installation of emergency lighting systems? A) 700 B) 701 C) 702
C) 8
D) 10
Answer: C Explanation: NEC 210.19(A)(1) allows up to 8 circuits before applying demand factors. Question 28. Which of the following is a requirement for a listed EV charging station in Vermont? A) Must be installed outdoors only B) Must have a dedicated 240‑V, 40‑A circuit with GFCI protection C) Must be connected to a 120‑V circuit D) No grounding electrode needed Answer: B Explanation: EV chargers require a dedicated 240‑V circuit and GFCI per NEC 625. Question 29. The ampacity adjustment factor for three current‑carrying conductors in a conduit is A) 0. B) 0. C) 0. D) 0. Answer: A Explanation: NEC Table 310.15(B)(3)(a) gives a 0.80 factor for 3 conductors. Question 30. The minimum height for a smoke detector in a dwelling is A) 4 ft from the floor B) 6 ft from the floor
C) 8 ft from the floor D) No height requirement, just on the ceiling or high on a wall Answer: D Explanation: NEC 760.9 requires detectors on the ceiling or high on a wall; no specific height. Question 31. Which conduit material is not permitted for use in a hazardous (Class I, Division 2) location? A) Rigid metal conduit (RMC) B) PVC Schedule 40 C) Intermediate metal conduit (IMC) D) Flexible metal conduit (FMC) Answer: B Explanation: PVC is not allowed in Class I, Division 2 areas due to lack of flame‑retardant properties. Question 32. The required size of a grounding electrode conductor for a 200‑A service using copper is A) #6 AWG B) #4 AWG C) #2 AWG D) 1/0 AWG Answer: B Explanation: Table 250.66 lists #4 AWG copper for 200 A services. Question 33. Which NEC article addresses the installation of fire alarm systems? A) 700
A) A motor that runs for 30 minutes per day B) Lighting that operates for 3 hours or more each day C) A dryer that cycles on and off D) A refrigerator Answer: B Explanation: Continuous loads run for ≥3 hours continuously. Question 37. The minimum clearance between a service disconnect and a combustible wall is A) 1 ft B) 2 ft C) 3 ft D) 4 ft Answer: B Explanation: NEC 110.26 requires a 2‑ft clearance from combustible material. Question 38. In a residential dwelling, the required number of GFCI‑protected receptacles in a kitchen is A) At least two countertop locations B) All receptacles in the kitchen C) Only the refrigerator receptacle D) None, unless near a sink Answer: A Explanation: NEC 210.8(A)(6) mandates at least two GFCI receptacles for countertop areas.
Question 39. Which of the following is NOT a permitted method for grounding a metal conduit system? A) Bonding jumpers at each connection B) Using the conduit itself as the grounding path C) Installing a separate grounding electrode conductor D) Relying on a plastic conduit for grounding Answer: D Explanation: Plastic conduit cannot serve as a grounding path. Question 40. The NEC requires that a disconnecting means for a service be located A) Within 10 ft of the service entrance B) At the same location as the service equipment C) Outside the building only D) In a separate room from the service entrance Answer: B Explanation: Article 230.71 requires the service disconnect to be at the service equipment location. Question 41. A 120‑V, 20‑A circuit feeding a bathroom exhaust fan must be protected by a A) 15‑A breaker B) 20‑A breaker with GFCI C) 20‑A breaker only D) 30‑A breaker with AFCI Answer: B Explanation: The fan circuit in a bathroom requires GFCI protection per 210.8(A)(1).
Explanation: NEC 240.21 permits short taps with ampacity up to 120 % of the feeder. Question 45. The required clearance for a service mast above a roof surface is A) 3 ft B) 6 ft C) 10 ft D) 12 ft Answer: B Explanation: NEC 230.24 requires a minimum 6‑ft clearance above the roof. Question 46. In a commercial kitchen, the minimum rating for a receptacle supplying a microwave oven is A) 15 A B) 20 A C) 30 A D) 50 A Answer: C Explanation: NEC 210.23(A)(2) requires a minimum 30‑A receptacle for fixed cooking equipment over 1 ½ kW. Question 47. Which of the following is true about a “dedicated” circuit? A) It can serve any load in the building B) It must supply only one specific appliance or equipment C) It must be on a separate panelboard D) It must be protected by a GFCI only
Answer: B Explanation: A dedicated circuit supplies only the designated equipment. Question 48. The NEC defines a “hazardous (classified) location” as an area where A) Water is present B) Combustible dust, gases, or vapors may be present in ignitable concentrations C) High voltage equipment is installed D) Only outdoor lighting is used Answer: B Explanation: Classified locations involve flammable materials that could ignite. Question 49. The minimum size of a grounding electrode conductor for a concrete‑encased electrode (Ufer) is A) #6 AWG copper B) #8 AWG copper C) #4 AWG copper D) #2 AWG copper Answer: A Explanation: Table 250.66 lists #6 AWG copper for a Ufer electrode. Question 50. Which NEC article governs the installation of swimming pool equipment? A) 680 B) 690 C) 695
C) Adding a protective plate over the conduit D) Leaving the conduit exposed in a high‑traffic area without protection Answer: D Explanation: Exposed raceways in high‑traffic areas must be protected. Question 54. The NEC permits a 15‑A GFCI receptacle to protect a 20‑A branch circuit if A) The receptacle is the first device on the circuit B) The circuit supplies only lighting loads C) The circuit is for a garage D) This is not permitted Answer: D Explanation: A 15‑A receptacle cannot protect a 20‑A circuit; the breaker must match the receptacle rating. Question 55. The minimum height for a wall‑mounted receptacle in a dwelling unit is A) 12 in. above the floor B) 15 in. above the floor C) 18 in. above the floor D) No minimum height, only location restrictions apply Answer: D Explanation: NEC 210.52 does not set a minimum height for wall receptacles. Question 56. Which type of transformer connection provides a neutral point without a separate winding? A) Delta‑wye
B) Wye‑wye C) Delta‑delta D) Open‑delta Answer: A Explanation: A delta‑wye transformer creates a neutral on the wye side. Question 57. The NEC requires that a receptacle in a laundry room be A) 20‑A GFCI protected B) 15‑A AFCI protected C) 30‑A GFCI protected D) No special protection required Answer: A Explanation: NEC 210.8(A)(10) mandates 20‑A GFCI receptacles in laundry areas. Question 58. A conduit fill calculation for 4‑wire 4‑in. PVC conduit using #8 AWG THHN results in a fill percentage of A) 20 % B) 30 % C) 40 % D) 50 % Answer: B Explanation: Table 1, Chapter 9 shows 4 #8 THHN in 4‑in. PVC equals 30 % fill. Question 59. The maximum allowable temperature rise for a 60‑Hz motor under normal operating conditions is
