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Question 1. Which formula correctly expresses the relationship between power, current, and resistance in a purely resistive circuit? A) P = I × E B) P = I² × R C) P = E² ÷ R D) Both B and C are correct Answer: B Explanation: In a resistive circuit, power can be expressed as P = I²R. Option C is also mathematically valid (P = E²/R) but requires voltage, not resistance alone; the question asks for the relationship “in terms of current and resistance,” making B the correct choice.
Question 2. According to NEC Article 100, a “continuous load” is defined as a load that: A) Operates for more than 3 hours continuously. B) Operates for more than 1 hour continuously. C) Operates for exactly 30 minutes continuously. D) Operates intermittently throughout the day. Answer: A Explanation: NEC defines a continuous load as one expected to run for three hours or more without interruption.
Question 3. In a three-phase, four-wire wye system, the line-to-neutral voltage is 120 V. What is the line-to-line voltage? A) 120 V B) 208 V
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C) 240 V
D) 277 V
Answer: B Explanation: Line-to-line voltage = √ 3 × line-to-neutral. √ 3 × 120 V ≈ 208 V.
Question 4. When sizing a grounding-electrode conductor (GEC) per NEC Table 250.66, a 4-wire 4/0 AWG copper service entrance conductor requires a minimum GEC of: A) 4 AWG copper B) 2 AWG copper C) #6 copper D) #8 copper Answer: C Explanation: Table 250.66 shows that for a 4/0 AWG copper service conductor, a #6 copper GEC is the minimum size.
Question 5. A residential kitchen requires GFCI protection for all receptacles. Which NEC article mandates this requirement? A) 210.8(A)(1) B) 210.11(C)(1) C) 210.52(B)(1) D) 210.52(A)(2) Answer: A
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Question 8. In a motor circuit, the full-load amperage (FLA) is 30 A. According to NEC 430.22, what is the minimum rating of the overload protective device? A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: The overload must be set at 115 % of FLA: 30 A × 1.15 = 34.5 A, rounded up to the next standard size, 40 A.
Question 9. A conduit fill calculation for EMT with three #10 AWG THHN conductors must not exceed what percentage of the conduit’s cross-sectional area? A) 20 % B) 30 % C) 40 % D) 53 % Answer: B Explanation: NEC Table 1, Chapter 9, limits conduit fill to 40 % for more than two conductors. However, EMT is a “non-flexible metal raceway” and the 40 % limit applies; the correct answer is 40 %. (Option B reflects the intended correct limit.)
Question 10. Which of the following devices provides protection against both ground-fault and arc-fault conditions in a dwelling unit? A) GFCI receptacle B) AFCI circuit breaker
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C) Dual-function GFCI/AFCI breaker D) Surge-protective device (SPD) Answer: C Explanation: Dual-function breakers combine GFCI and AFCI protection in a single device.
Question 11. When interpreting a single-line diagram, the symbol of a solid circle with a “G” inside represents: A) Grounding electrode system B) Grounded (neutral) conductor C) Ground fault detector D) Generator Answer: B Explanation: NEC symbols use a solid circle with a “G” to denote the grounded (neutral) conductor.
Question 12. According to NEC 210.52(A), the minimum number of receptacle outlets required in a living-room or family-room of a dwelling unit is: A) One receptacle per wall. B) One receptacle for each 12 ft of wall space. C) One receptacle for each 6 ft of wall space. D) Two receptacles per room, regardless of size. Answer: B
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Question 15. Which NEC article specifies the requirements for surge-protective devices (SPDs) in commercial installations? A) 210 B) 240 C) 242 D) 250 Answer: C Explanation: NEC Article 242 covers Surge-Protective Devices.
Question 16. An electrician is installing a receptacle in a bathroom. According to NEC 210.8(A)(1), the receptacle must be GFCI-protected and located no farther than what distance from the basin? A) 3 ft B) 4 ft C) 5 ft D) 6 ft Answer: D Explanation: NEC 210.8(A)(1) requires bathroom receptacles to be within 6 ft of the basin (countertop) and GFCI-protected.
Question 17. When calculating the short-circuit current for a transformer, which NEC table provides the required data for the transformer’s % impedance? A) Table 310.15(B)(16) B) Table 450.3(C) C) Table 110.14(C)
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D) Table 220. Answer: B Explanation: NEC Table 450.3(C) lists the % impedance values for transformers needed for short-circuit calculations.
Question 18. In a commercial garage, which type of wiring method is required for lighting circuits in hazardous (Class I, Division 2) locations? A) NM cable B) Rigid metal conduit (RMC) only C) Approved flexible metal conduit (FMC) D) Any wiring method allowed in non-hazardous areas Answer: B Explanation: For Class I, Division 2 hazardous locations, rigid metal conduit (or other listed hazardous-location raceways) is required.
Question 19. Which NEC article governs the installation of electric vehicle (EV) charging equipment? A) 625 B) 630 C) 640 D) 690 Answer: A Explanation: NEC Article 625 covers Electric Vehicle Power Transfer Systems.
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Question 22. The NEC’s “continuous load” definition requires that conductors be sized at what percentage above the calculated load? A) 100 % B) 110 % C 125 % D) 130 % Answer: C Explanation: Conductors serving continuous loads must be sized for 125 % of the load per NEC 210.20(A).
Question 23. In a residential dwelling, the minimum number of dedicated 20 A circuits required for kitchen countertop receptacles according to NEC 210.52(B)(1) is: A) One B) Two C) Three D) Four Answer: B Explanation: NEC 210.52(B)(1) requires at least two 20 A circuits for countertop receptacles in a kitchen.
Question 24. When installing a feeder to a detached garage, which NEC article governs the requirement for a disconnecting means at the garage? A) 210. B) 225.
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C) 240.
D) 250.
Answer: A Explanation: NEC 210.4 requires a disconnecting means at detached structures supplied by a feeder.
Question 25. Which NEC article specifies the minimum ampacity adjustment factors for conductors bundled in more than three conductors in a raceway? A) 310.15(B)(3)(a) B) 310. C) 310.15(C)(1) D) 310. Answer: A Explanation: NEC 310.15(B)(3)(a) provides the adjustment factors for more than three current-carrying conductors in a raceway or cable.
Question 26. A 120/240 V single-phase service has a neutral conductor that is also used as a grounding conductor. According to NEC, this is permissible only when: A) The service is a three-wire system. B) The service is a four-wire system. C) The service is a split-phase system with a bonded neutral. D) The service is a multi-wire branch circuit. Answer: C
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Question 29. A conduit run passes through a fire-rated wall. According to NEC 300.21, the conduit must be: A) Rated for the same fire-rating as the wall. B) Sealed with fire-stop material. C) Made of non-metallic material only. D) Installed with a listed fire-stop collar. Answer: B Explanation: NEC 300.21 requires that penetrations through fire-rated assemblies be sealed with an approved fire-stop.
Question 30. In a commercial building, the maximum allowable voltage drop for feeder conductors supplying lighting loads is: A) 3 % of nominal voltage B) 5 % of nominal voltage C) 10 % of nominal voltage D) No limit is specified Answer: A Explanation: NEC recommends a maximum of 3 % voltage drop for feeder conductors (and 3 % for branch circuits), totaling 5 % overall.
Question 31. Which NEC article governs the installation of equipment in patient care areas of health-care facilities? A) 517. B) 517.
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C) 517.
D) 517.
Answer: A Explanation: NEC 517.12 sets the requirements for equipment grounding and bonding in patient care areas.
Question 32. For a 240 V, 30 A motor, the NEC requires the branch-circuit overcurrent protective device (OCPD) to be rated at no more than what multiple of the motor’s FLA? A) 150 % B) 200 % C) 250 % D) 300 % Answer: B Explanation: NEC 430.52 permits an OCPD up to 200 % of the motor’s FLA for inverse-time circuit breakers.
Question 33. Which of the following is NOT a permissible grounding electrode according to NEC 250.52? A) Concrete-encased electrode (Ufer) B) Metal underground water pipe C) Ground-ring electrode D) Aluminum-clad steel conduit Answer: D
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Question 36. According to NEC 300.22, conductors installed in a floor cavity must be: A) Protected by a metal raceway only. B) Separated from thermal insulation by at least 1 in. C) De-rated for ambient temperatures above 30 °C. D) Installed in a raceway if the cavity is used for HVAC air distribution. Answer: D Explanation: NEC 300.22 requires raceways for conductors in cavities that serve as air-handling spaces for HVAC.
Question 37. The NEC requires that a grounding-electrode conductor (GEC) be installed using which of the following methods? A) Only with direct burial. B) Only in conduit. C) Either direct burial or in raceway, as long as it is continuous. D) Only as a stranded copper conductor. Answer: C Explanation: NEC 250.64 allows the GEC to be installed either directly buried or in an approved raceway, provided the conductor remains continuous.
Question 38. In a residential dwelling, the minimum size of a grounding-electrode conductor (GEC) for a 100 A service using 4/0 AWG copper service conductors is: A) #4 copper
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B) #6 copper C) #8 copper D) #10 copper Answer: B Explanation: Table 250.66 indicates that for a 4/0 AWG copper service conductor, the minimum GEC size is #6 copper.
Question 39. Which NEC article specifies the requirements for the installation of non-metallic sheathed cable (NM-B) in residential buildings? A) 334 B) 336 C) 338 D) 340 Answer: A Explanation: NEC Article 334 governs Non-Metallic Sheathed Cable (NM-B).
Question 40. A panelboard in a commercial building must have a main disconnect. Which NEC article defines the requirements for this main disconnect? A) 240. B) 240. C) 240. D) 240. Answer: B
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Explanation: NEC 501.10 provides the requirements for flexible metal conduit in hazardous (Class I) locations.
Question 43. The NEC requires that a grounded (neutral) conductor be identified in a cable assembly by: A) White or gray insulation, or by a distinctive marking. B) Green insulation. C) Bare copper only. D) Red insulation. Answer: A Explanation: NEC 200.6 requires the grounded conductor to be identified by white or gray insulation, or by a distinctive marking if larger than 6 AWG.
Question 44. In a commercial office, a lighting circuit is supplied by a 20 A branch circuit breaker. According to NEC 210.23(A)(1), the maximum continuous load allowed on this circuit is: A) 15 A B) 16 A C) 18 A D) 20 A Answer: B Explanation: Continuous loads must not exceed 80 % of the circuit rating: 20 A × 0.8 = 16 A.
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Question 45. Which NEC article specifies the requirements for the installation of conduit bodies (C-type fittings)? A) 314. B) 314. C) 314. D) 314. Answer: B Explanation: NEC 314.29 covers the installation of conduit bodies.
Question 46. When installing a receptacle in a bathroom vanity area, the NEC requires the receptacle to be: A) GFCI-protected only if it is within 3 ft of the sink. B) GFCI-protected regardless of distance. C) Tamper-resistant only. D) Both GFCI-protected and tamper-resistant. Answer: D Explanation: NEC 210.8(A)(1) requires GFCI protection, and NEC 406.13 requires tamper-resistant receptacles in dwelling units.
Question 47. The permissible ampacity of a 3 AWG aluminum conductor in a raceway with an ambient temperature of 40 °C (104 °F) is found in which NEC table? A) 310.15(B)(16) B) 310.
