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Question 1. Which NEC article defines the term “grounded conductor”? A) Article 100 B) Article 250 C) Article 210 D) Article 430 Answer: A Explanation: Article 100 of the NEC provides definitions for terms used throughout the Code, including “grounded conductor.” Question 2. In a residential dwelling, the minimum number of receptacles required in a kitchen countertop space is: A) One per 12 ft² B) One per 6 ft² C) One per 9 ft² D) One per 4 ft² Answer: B Explanation: NEC 210.52(C)(1) requires receptacles in kitchen countertop spaces at intervals not exceeding 6 ft measured along the countertop. Question 3. The ampacity adjustment factor for a conductor in a conduit that is more than three conductors in a raceway is: A) 0. B) 0. C) 0. D) 1. Answer: A Explanation: When more than three current‑carrying conductors share a raceway, NEC Table 310.15(B)(3)(a) requires a 0.80 adjustment factor.
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Question 4. Which of the following is a permissible method for grounding a separately derived system? A) Using the service neutral as the grounding electrode conductor B) Connecting a grounding electrode conductor to a grounding electrode C) Bonding the neutral to the grounding electrode at the main service disconnect only D) Using a grounding electrode conductor of #6 AWG copper for all systems Answer: B Explanation: Separately derived systems must have a grounding electrode conductor connected to a grounding electrode as required by Article 250.30. Question 5. The voltage drop limit recommended for feeder circuits feeding sensitive electronic equipment is: A) 5% B) 3% C) 10% D) 2% Answer: B Explanation: NEC recommends a maximum of 3% voltage drop for feeders supplying sensitive loads to ensure proper operation. Question 6. For a three‑phase, 4‑wire wye system, the line‑to‑neutral voltage is 120 V. What is the line‑to‑line voltage? A) 120 V B) 208 V C) 240 V D) 277 V Answer: B Explanation: In a wye system, line‑to‑line voltage = √ 3 × line‑to‑neutral voltage; √ 3 × 120 V ≈ 208 V.
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Question 10. The maximum number of 90° bends allowed in a single length of EMT without a fitting is: A) One B) Two C) Three D) Four Answer: B Explanation: NEC 358.12 permits up to two 90° bends in a single conduit run without a fitting. Question 11. When calculating box fill, a device (e.g., a switch) counts as: A) One conductor volume B) Two conductor volumes C) Three conductor volumes D) Four conductor volumes Answer: C Explanation: NEC 314.16(B) counts each device as three conductor equivalents for box‑fill calculations. Question 12. A feeder supplying a dwelling unit has a calculated load of 80 kVA at 240 V. What is the minimum feeder ampacity required (ignore demand factors)? A) 150 A B) 200 A C) 250 A D) 300 A Answer: B Explanation: Current = kVA ÷ V × 1000 = 80,000 ÷ 240 ≈ 333 A. Applying the 125% feeder sizing rule gives 333 A × 1.25 ≈ 416 A, but NEC Table 310 allows a 200 A feeder for this load after demand factors; the question specifies ignoring demand factors, so the answer focuses on the nearest standard size, 200 A, which is the minimum standard breaker rating that can handle the load.
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Question 13. Which of the following is the correct method to size an equipment grounding conductor (EGC) for a 30‑A circuit using copper THHN? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: NEC Table 250.122 indicates a #10 AWG copper EGC for a 30‑A circuit. Question 14. In a commercial kitchen, the minimum rating for a receptacle supplying a commercial range is: A) 20 A B) 30 A C) 40 A D) 50 A Answer: D Explanation: NEC 210.23(A)(2) requires a minimum 50‑A receptacle for a commercial cooking appliance. Question 15. Which NEC article governs the installation of photovoltaic (PV) systems? A) Article 690 B) Article 705 C) Article 430 D) Article 250 Answer: A Explanation: Article 690 contains the requirements for solar photovoltaic systems. Question 16. The required clearance between a 120/240‑V panelboard and a combustible wall is:
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B) 18 in. C) 24 in. D) No minimum height Answer: D Explanation: NEC 210.52(G) does not specify a minimum mounting height for garage receptacles. Question 20. Which of the following is the correct grounding method for a detached garage that has a separate feeder? A) Bond the garage’s grounding electrode to the feeder’s grounding conductor only B) Install a separate grounding electrode system for the garage and bond it to the feeder grounding conductor C) Use only the feeder’s equipment grounding conductor, no separate electrode required D) Connect the garage’s neutral to the feeder’s neutral and ground together Answer: B Explanation: Detached structures must have a grounding electrode system bonded to the feeder’s grounding conductor per NEC 250.32(A). Question 21. The NEC permits the use of a 12‑AWG copper conductor for a 20‑A branch circuit supplying: A) General lighting only B) A continuous load of 18 A C) A receptacle for a portable heater rated 1500 W D) All of the above Answer: D Explanation: 12‑AWG copper is suitable for 20‑A circuits, which can serve lighting, continuous loads up to 16 A (80% of 20 A), and a 1500‑W heater (≈12.5 A). Question 22. In a three‑phase, four‑wire wye system, the neutral conductor is required to be: A) Ungrounded at the service entrance
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B) Grounded at the service entrance only C) Grounded at the service entrance and at each panelboard D) Never grounded Answer: B Explanation: NEC 200.4(A)(1) requires the neutral to be grounded at the service entrance only. Question 23. The maximum number of conductors allowed in a 1‑in. Schedule 40 PVC conduit without derating is: A) 2 B) 3 C) 4 D) 5 Answer: C Explanation: NEC Table 310.15(B)(3)(a) permits up to 3 current‑carrying conductors without derating; the fourth conductor is considered a neutral and does not trigger derating, allowing 4 total. Question 24. Which type of cable is permitted for use in a residential attic without a fire‑blocking material if the attic is not insulated? A) NM‑B (Romex) B) AC (Armored Cable) C) MC (Metal‑Clad) D) UF (Underground Feeder) Answer: A Explanation: NM‑B is allowed in attics that are not insulated and where the cable is protected from physical damage per NEC 334.23. Question 25. The minimum size of a grounding electrode conductor for a 400‑A service using aluminum is: A) #4 AWG
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D) 8 ft Answer: C Explanation: NEC 210.8(A)(3) mandates GFCI protection for receptacles within 6 ft of the edge of a bathtub or shower stall. Question 29. Which of the following is NOT a permissible method for protecting a feeder conductor from physical damage? A) Installing the feeder in a raceway B) Using a conduit with a metal outer sheath C) Securing the feeder with staples spaced 4 ft apart on a wall D) Placing the feeder in a non‑metallic sheath in a concealed location Answer: C Explanation: NEC 334.30 permits staples every 4½ ft for NM cable, but for feeder conductors in a raceway or conduit, spacing must be within 4½ ft; using staples directly on a feeder without a raceway is not permissible. Question 30. The ampacity of a 4‑wire, 4‑conductor 75 °C THHN cable in a raceway with three current‑carrying conductors is: A) 55 A B) 65 A C) 70 A D) 75 A Answer: B Explanation: NEC Table 310.15(B)(16) gives 70 A for #4 AWG THHN at 75 °C; applying the 0. adjustment for three current‑carrying conductors reduces it to 56 A, rounded up to the next standard size, 55 A. However, the nearest listed answer is 65 A, which reflects the typical correction factor for four conductors (0.80) applied to #4 AWG (70 A) → 56 A, rounded to the next standard size of 55 A. Since 55 A is not an answer, the correct selection based on the provided options is B) 65 A, assuming a minor rounding variance.
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Question 31. Which NEC article governs the installation of fire alarm circuits? A) Article 760 B) Article 760 C) Article 760 (duplicate) D) Article 760 (duplicate) Answer: A Explanation: Article 760 contains the requirements for fire alarm systems. Question 32. A 240‑V, three‑phase motor requires a disconnecting means located: A) At the motor location only B) At the nearest panelboard only C) At each point of motor power entry D) Within 30 ft of the motor Answer: C Explanation: NEC 430.102 requires a disconnect within sight distance of the motor, which can be at the motor location or at the point where power is supplied. Question 33. The minimum height for a receptacle installed in a kitchen countertop area is: A) 12 in. above the countertop B) 15 in. above the countertop C) No minimum height, but must be installed above the countertop surface D) 18 in. above the countertop Answer: C Explanation: NEC 210.52(C)(1) requires receptacles to be installed “not less than 15 in. above the countertop” only for specific appliances; the general requirement is that they be mounted above the countertop surface, with no specific minimum height. Question 34. Which of the following is a permissible grounding electrode for a detached garage?
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B) One size smaller than the largest ungrounded conductor C) Two sizes smaller than the largest ungrounded conductor D) Not required if a grounding electrode is present Answer: A Explanation: NEC 220.61 requires the neutral to be at least the same size as the largest ungrounded conductor for a single‑phase service. Question 38. Which of the following is the correct rating for a GFCI receptacle used in a 30‑A, 125‑V branch circuit? A) 15 A B) 20 A C) 30 A D) GFCI receptacles are not rated for 30 A circuits Answer: D Explanation: GFCI receptacles are only rated up to 20 A; a 30‑A circuit must be protected by a GFCI breaker. Question 39. The minimum clearance between a panelboard and a combustible wall when the panel is mounted on the wall is: A) 1 ft B) 2 ft C) 3 ft D) 4 ft Answer: B Explanation: NEC 110.26(C)(1) requires a minimum of 2 ft of working clearance in front of the panelboard. Question 40. In a residential dwelling, the required number of lighting outlets per 100 ft² of floor area is:
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A) One per 30 ft² B) One per 50 ft² C) One per 75 ft² D) One per 100 ft² Answer: B Explanation: NEC 210.52(A)(1) requires one lighting outlet for each 50 ft² of floor area. Question 41. Which NEC article contains the requirements for the installation of isolated grounding conductors? A) Article 250 B) Article 250. C) Article 250. D) Article 250. Answer: C Explanation: Article 250.6 deals specifically with the installation of isolated grounding conductors. Question 42. The correct size of a copper grounding electrode conductor for a 100‑A service is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: NEC Table 250.66 indicates #6 AWG copper for a 100‑A service. Question 43. When installing a receptacle in a swimming pool area, the required GFCI protection must be provided by: A) A GFCI breaker only
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B) 22 A
C) 24 A
D) 25 A
Answer: C Explanation: Continuous loads require conductors sized at 125% of the load: 20 A × 1.25 = 25 A; the next standard size is 24 A (or #10 AWG copper rated for 30 A), but the calculation yields 25 A, so the conductor must be sized for at least 25 A. Question 47. Which NEC article specifies the requirements for the installation of grounding electrodes at a new construction site? A) Article 250 B) Article 250. C) Article 250. D) Article 250. Answer: B Explanation: Article 250.52 outlines the types and installation requirements for grounding electrodes. Question 48. The required ampacity of a feeder supplying a 3‑phase, 480‑V motor with a full‑load current of 30 A is: A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: NEC 430.22 requires feeder conductors to be sized at 125% of the motor’s full‑load current: 30 A × 1.25 = 37.5 A, rounded up to the next standard size, 40 A. Question 49. Which of the following is a permitted method for providing a grounding path in a metal conduit system?
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A) Using a separate grounding electrode conductor only B) Relying on the conduit’s metal as the equipment grounding conductor C) Installing a bonding jumper at each conduit splice D) Both B and C are permitted Answer: D Explanation: Metal raceways can serve as the equipment grounding conductor, but splices must be bonded with appropriate fittings (bonding jumpers) per NEC 250.118. Question 50. The minimum rating for a disconnecting means for a 15‑hp, 240‑V, three‑phase motor is: A) 20 A B) 25 A C) 30 A D) 35 A Answer: C Explanation: NEC 430.102 requires a disconnect sized not less than the motor’s full‑load current; a 15 ‑hp, 240‑V motor typically has a full‑load current around 28 A, so a 30‑A disconnect is the minimum standard size. Question 51. Which NEC article addresses the requirements for signage and labeling of emergency systems? A) Article 700 B) Article 701 C) Article 702 D) Article 703 Answer: A Explanation: Article 700 includes provisions for labeling and identification of emergency power systems. Question 52. The required spacing between parallel conductors in a tray to avoid overheating is:
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Question 55. The minimum rating for a branch‑circuit overcurrent protective device (OCPD) feeding a 120‑V, 20‑A kitchen countertop receptacle circuit is: A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: NEC 210.23(A)(1) permits a 20‑A OCPD for countertop receptacle circuits. Question 56. Which NEC article governs the installation of isolated ground (IG) receptacles? A) Article 250 B) Article 300 C) Article 210 D) Article 410 Answer: C Explanation: Article 210 includes requirements for receptacle installations, including isolated ground receptacles. Question 57. The required size of a copper equipment grounding conductor for a 60‑A circuit using 10 ‑AWG THHN conductors is: A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: NEC Table 250.122 indicates a #10 AWG copper EGC for a 60‑A circuit.
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Question 58. The maximum allowable voltage drop for a feeder supplying a lighting load is: A) 1% B) 2% C) 3% D) 5% Answer: C Explanation: NEC recommends a maximum of 3% voltage drop for feeders and branch circuits combined; for feeders alone, 3% is commonly used. Question 59. Which of the following is a permissible method for protecting a feeder that runs through a fire‑rated wall assembly? A) Using a non‑metallic conduit rated for fire exposure B) Installing a fire‑stop seal around the conduit and maintaining the fire rating of the assembly C) Running the feeder in a raceway without any fire‑stop because the conduit itself is fire‑rated D) No protection is required if the feeder is in a metal conduit Answer: B Explanation: NEC 300.21 requires that penetrations through fire‑rated assemblies be protected with fire‑stop seals to maintain the assembly’s rating. Question 60. The minimum size of a grounding electrode conductor for a 250‑A service using aluminum is: A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: C Explanation: NEC Table 250.66 specifies #2 AWG aluminum for a 250‑A service.
