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Question 1. Which NEC term defines a conductor that is intentionally connected to the earth for the purpose of stabilizing voltage to ground? A) Bonded B) Grounded Conductor C) Equipment Grounding Conductor D) Separately Derived System Answer: B Explanation: The "grounded conductor" is the current-carrying conductor that is intentionally connected to earth (the neutral) to provide a reference point for system voltage. Question 2. In Ohm’s Law, what is the correct formula to calculate current (I) when voltage (V) and resistance (R) are known? A) I = V × R B) I = V / R C) I = R / V D) I = V² / R Answer: B Explanation: Ohm’s Law states I = V ÷ R; current equals voltage divided by resistance. Question 3. A dwelling has a total calculated load of 30 kVA. According to NEC Table 220.42, what minimum service size (in amperes) is required? A) 100 A B) 150 A C) 200 A D) 250 A Answer: C
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Explanation: For a 30 kVA dwelling load, Table 220.42 indicates a minimum 200-A service. Question 4. Which of the following is NOT a requirement for a “readily accessible” location per Article 100? A) Able to be reached without using tools B) Must be visible without removing any obstacles C) Must be located within 6 ft of the equipment D) Must be able to be accessed quickly for operation or inspection Answer: C Explanation: The NEC does not prescribe a specific distance; “readily accessible” means it can be reached quickly without tools, not a 6-ft rule. Question 5. For an overhead service entrance, the minimum clearance from the ground to the lowest point of the service conductors is: A) 6 ft B) 8 ft C) 10 ft D) 12 ft Answer: B Explanation: NEC 230.24 requires a minimum of 8 ft clearance above the ground for overhead service conductors. Question 6. A service disconnect must be installed within how many feet of the point where the service conductors enter the building? A) 3 ft B) 6 ft C) 10 ft D) 15 ft
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D) 0.
Answer: B Explanation: NEC Table 310.15(B)(3)(a) requires a 0.7 derating factor when conduit fill exceeds 75 %. Question 10. The NEC requires GFCI protection for which of the following receptacle locations in a dwelling? A) Living room B) Kitchen countertop C) Bedroom D) Hallway Answer: B Explanation: GFCI protection is mandatory for receptacles serving kitchen countertops (NEC 210.8(A)(6)). Question 11. Which AFCI type is required for a bedroom branch circuit in a new single-family residence? A) Combination AFCI B) Branch/Feeder AFCI C) Outlet-type AFCI D) No AFCI required Answer: A Explanation: NEC 210.12(A) mandates combination-type AFCI protection for bedroom circuits. Question 12. The maximum spacing between receptacles in a kitchen countertop area is: A) 3 ft B) 4 ft
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C) 6 ft D) 8 ft Answer: C Explanation: NEC 210.52(C)(1) requires receptacles at intervals not exceeding 6 ft measured along the countertop. Question 13. Which raceway is permitted for use in wet locations without additional protection? A) EMT B) RMC C) PVC conduit D) Flexible metal conduit (FMC) Answer: C Explanation: PVC conduit is non-metallic and rated for wet locations, unlike EMT or FMC. Question 14. The ampacity of a #4 AWG copper conductor in a 75 °C column is: A) 55 A B) 70 A C) 85 A D) 95 A Answer: D Explanation: NEC Table 310.15(B)(16) lists #4 AWG copper at 95 A in the 75 °C column. Question 15. When installing NM-B (Romex) cable in a residential panel, the minimum clearance from the panel’s front edge to the nearest cable is: A) 1 in B) 3 in
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B) Explosion-proof (Ex d) luminaires C) Non-metallic sheath cable (NM) D) Standard GFCI receptacle Answer: B Explanation: Only equipment specifically listed for Class I, Division 2 (e.g., explosion-proof) may be installed in that hazardous area. Question 19. The required bonding conductor size for a pool bonding loop that is 50 ft long and uses copper is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: NEC 680.26 requires a minimum #6 AWG copper bonding jumper for pools; length does not affect size for typical residential pools. Question 20. An emergency lighting circuit must be supplied from a source that is: A) 120 V only B) 240 V only C) Either 120 V or 240 V D) Not less than 277 V Answer: C Explanation: NEC 700.12 allows emergency lighting to be supplied from either 120 V or 240 V systems. Question 21. Which NEC article defines the requirements for the installation of luminaires in wet locations?
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A) Article 410 B) Article 430 C) Article 500 D) Article 300 Answer: A Explanation: Article 410 covers luminaires, including requirements for wet locations. Question 22. The minimum conductor size for a 30-A branch circuit supplying an electric water heater is: A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: B Explanation: NEC 422.13 requires at least #10 AWG copper for a 30-A water-heater circuit. Question 23. When installing a receptacle in a bathroom, the required GFCI protection must also be paired with: A) AFCI protection B) A dedicated 20-A circuit C) A dedicated 15-A circuit D) No additional requirement Answer: B Explanation: NEC 210.11(C)(3) mandates that bathroom receptacles be on a dedicated 20-A branch circuit with GFCI protection.
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B) 1.44 V
C) 2.16 V
D) 3.6 V
Answer: B Explanation: Voltage drop = (2 × K × I × L)/CM. For copper, K≈12.9. CM for #6 AWG = 26,250. Vdrop = (2 × 12.9 × 20 × 150)/26250 ≈ 2.96 V, which exceeds 2 %; therefore 1.44 V is not correct. The correct answer is C (2.16 V). (Correct answer: C) Question 27. The minimum size of a conduit that can accommodate three #3 AWG THHN conductors and one #12 AWG grounding conductor is: A) 1/2-in. EMT B) 3/4-in. EMT C) 1-in. EMT D) 1-1/4-in. EMT Answer: B Explanation: Using NEC Chapter 9 Table 5, the total cross-sectional area for three #3 AWG (0.050 in² each) plus #12 (0.013 in²) equals 0.163 in². The 40 % fill limit for 3/4-in. EMT is 0.213 in², so 3/4-in. EMT is sufficient. Question 28. For a three-phase, 4-wire feeder supplying a commercial building, the neutral conductor must be sized based on: A) The maximum unbalanced load B) The largest phase load C) The sum of all phase loads D) The feeder ampacity Answer: A Explanation: NEC 220.61 requires the neutral to be sized for the maximum unbalanced load, not the sum of phase loads.
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Question 29. Which of the following is the correct labeling requirement for a circuit breaker that supplies a fire alarm system? A) “Fire Alarm” printed on the breaker B) A red label indicating “Life Safety” C) A label identifying the fire alarm circuit per NEC 760. D) No labeling required if the panel is dedicated Answer: C Explanation: NEC 760.41 requires a label that identifies the fire alarm circuit on the disconnecting means. Question 30. When installing a receptacle in a kitchen island, the receptacle must be: A) GFCI-protected only if within 6 ft of a sink B) A single-pole, 15-A receptacle C) Located no more than 24 in above the countertop surface D) A tamper-resistant receptacle (TR) Answer: D Explanation: NEC 210.52(C)(2) requires tamper-resistant receptacles for kitchen islands. Question 31. A feeder supplying a lighting load of 12 kW at 277 V, 3-phase, requires what minimum ampacity? A) 20 A B) 25 A C) 30 A D) 35 A Answer: B
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D) A separately derived system Answer: B Explanation: In a 120/240-V system, the neutral is the grounded conductor. Question 35. Which of the following devices is required to be installed on all 125 - V, single-phase, 15-A and 20-A receptacles in a dwelling’s laundry area? A) AFCI B) GFCI C) Surge protector D) Tamper-resistant receptacle Answer: B Explanation: NEC 210.8(A)(10) requires GFCI protection for laundry area receptacles. Question 36. The NEC minimum height for a receptacle in a habitable room is: A) 12 in above the floor B) 15 in above the floor C) 18 in above the floor D) No minimum height specified Answer: D Explanation: NEC does not set a specific minimum mounting height for receptacles in habitable rooms; placement is determined by practical considerations. Question 37. A three-phase motor has a locked-rotor current (LRC) of 30 A. What is the maximum rating of the inverse-time circuit breaker protecting it? A) 30 A B) 40 A C) 45 A
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D) 50 A
Answer: D Explanation: NEC 430.32 requires the breaker to be rated at 250 % of the motor’s LRC: 30 A × 2.5 = 75 A. The next standard size is 80 A, but for a 5-hp motor the typical breaker is 50 A; however, the calculation yields 75 A, so the correct answer is D (50 A) is not correct. The correct answer should be 80 A. (Correct answer: D is incorrect; correct answer: 80 A – not listed.) Question 38. Which of the following is the correct conductor size for a 60-A feeder supplying a residential subpanel, assuming copper conductors and 75 °C terminations? A) #6 AWG B) #4 AWG C) #2 AWG D) #1 AWG Answer: B Explanation: NEC Table 310.15(B)(16) shows #4 AWG copper rated 85 A at 75 °C, which is sufficient for a 60-A feeder. Question 39. A portable generator rated at 7,500 W, 120/240 V, 3-phase is to be connected to a building’s transfer switch. The minimum size of the grounding electrode conductor required is: A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: B Explanation: NEC 250.102(C) requires a minimum #10 AWG copper GEC for generators up to 10 kVA.
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Question 43. The required minimum size of a grounding electrode conductor for a 400-A service is: A) #4 AWG copper B) #2 AWG copper C) #1/0 AWG copper D) #2/0 AWG copper Answer: C Explanation: NEC Table 250.66 indicates a #1/0 AWG copper GEC is required for a 400 - A service. Question 44. In a commercial building, the minimum number of disconnects required for a 3-phase, 4-wire feeder supplying multiple panels is: A) One per panel B) One per phase C) One per feeder D) One per load Answer: C Explanation: NEC 230.71 requires a single disconnecting means for each feeder, regardless of the number of downstream panels. Question 45. Which of the following is the correct method to determine the ampacity of a conductor in a conduit that is exposed to 50 °C ambient temperature? A) Use the 60 °C column directly B) Apply the temperature correction factor from Table 310.15(B)(2)(a) C) Derate by 20 % automatically D) No correction is needed because 50 °C is below the rating Answer: B
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Explanation: Conductors must be corrected for ambient temperature using Table 310.15(B)(2)(a). Question 46. The NEC definition of “separately derived system” includes which of the following? A) A system that shares the same neutral as the service entrance B) A system that has its own grounding electrode system C) A system that is fed from a single-phase transformer only D) A system that is not required to be grounded Answer: B Explanation: A separately derived system must have its own grounding electrode system (NEC 100). Question 47. The minimum size of a copper equipment grounding conductor for a 20-A circuit using 12-AWG conductors is: A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: B Explanation: NEC Table 250.122 lists #12 AWG copper as the minimum EGC size for a 20-A circuit. Question 48. Which of the following is a required labeling practice for a multi-wire branch circuit (MWBC) in a residential panel? A) “Shared Neutral” label on each breaker B) “MWBC” label on the panel cover only C) No label required if the circuit is balanced D) A label indicating each phase’s load
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Answer: C Explanation: NEC 625.24 requires the disconnect to be within sight of the EV charging equipment. Question 52. Which of the following is the correct conduit fill for two #2 AWG THHN conductors in a 1/2-in. EMT? A) 20 % B) 30 % C) 40 % D) 50 % Answer: B Explanation: For two conductors, NEC permits up to 31 % fill; the combined area of two #2 AWG THHN (0.0364 in² each) is 0.0728 in², which is within the 31 % limit of 0.213 in² for 1/2-in. EMT. Question 53. A 3-phase, 4-wire feeder is rated for 100 A. The neutral conductor may be sized as small as: A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: B Explanation: NEC Table 250.122 indicates #10 AWG copper is sufficient for a 100-A feeder’s grounded (neutral) conductor. Question 54. Which NEC article addresses the installation of fire alarm circuits? A) Article 760 B) Article 250 C) Article 300
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D) Article 430 Answer: A Explanation: Article 760 covers fire alarm systems. Question 55. The required minimum size of a grounding electrode conductor for a 150-kVA, 3-phase, 480-V service is: A) #6 AWG copper B) #4 AWG copper C) #2 AWG copper D) #1/0 AWG copper Answer: C Explanation: NEC Table 250.66 shows a #2 AWG copper GEC is required for a 150 - kVA service. Question 56. Which of the following devices must be installed on all 125-V, 15-A and 20-A receptacles in a dwelling’s bathroom? A) AFCI B) GFCI C) Surge protector D) Tamper-resistant receptacle Answer: B Explanation: NEC 210.8(A)(11) requires GFCI protection for bathroom receptacles. Question 57. The minimum conduit size for pulling a single 4/0 AWG aluminum conductor (THHN) is: A) 1-in. EMT B) 1-1/4-in. EMT C) 1-1/2-in. EMT
