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Question 1. Which NEC article defines the definitions and terminology used throughout the Code? A) Article 90 B) Article 100 C) Article 110 D) Article 210 Answer: B Explanation: Article 100 contains the definitions and terminology that apply to the entire NEC. Question 2. Ohm’s Law states that voltage (V) equals which of the following? A) Current × Resistance B) Power ÷ Current C) Resistance ÷ Current D) Power × Resistance Answer: A Explanation: Ohm’s Law is V = I × R, where V is volts, I is amperes, and R is ohms. Question 3. In a single-phase, three-wire service, what is the maximum allowable voltage drop for feeder conductors serving a continuous load? A) 1% B) 2% C) 3% D) 5% Answer: B Explanation: NEC recommends a maximum of 2% voltage drop for feeders feeding continuous loads. Question 4. Which symbol on a blueprint represents a single-pole switch? A) □ with a “1” inside
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B) ⏚
C) A circle with a line through it D) A “S” inside a rectangle Answer: C Explanation: The standard symbol for a single-pole switch is a circle with a line (representing the toggle) through it. Question 5. The required clearance between a service lateral and a public sidewalk is: A) 6 ft B) 10 ft C) 12 ft D) 15 ft Answer: C Explanation: NEC 230.24 requires a minimum 12-ft clearance from the service lateral to a public way or sidewalk. Question 6. For a single-family dwelling with a calculated load of 40 A, what is the minimum size of the service entrance conductor (copper) per Table 310.16? A) 4 AWG B) 2 AWG C) 1/0 AWG D) 3 AWG Answer: B Explanation: Table 310.16 shows 2 AWG copper rated for 115 A, which exceeds the 40 A load and satisfies the minimum requirement. Question 7. The main bonding jumper (MBJ) for a residential service must be sized based on which NEC table? A) Table 250. B) Table 250.102(C)(1)
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D) No factor; ampacity remains unchanged Answer: C Explanation: NEC 310.15(B)(3)(a) requires applying both temperature correction and adjustment factors when >3 current-carrying conductors are present. Question 11. The minimum burial depth for PVC conduit carrying 120/240 V circuits under residential driveways is: A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: B Explanation: NEC 300.5(D) specifies a minimum of 18 in. burial for PVC conduit under a driveway. Question 12. The maximum number of 12-AWG NM-B cables allowed in a single 1 - in. EMT conduit is: A) 5 B) 7 C) 9 D) 11 Answer: C Explanation: Using Table 1 in Chapter 9 for conduit fill, 12-AWG NM-B (0.013 cu ft) allows up to 9 conductors in 1-in. EMT (0.304 cu ft). Question 13. Which type of raceway is permitted for outdoor exposure in wet locations? A) EMT B) Rigid Metal Conduit (RMC) C) Flexible Metal Conduit (FMC) D) Non-metallic raceway (PVC) only
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Answer: B Explanation: RMC is rated for wet locations and outdoor use; EMT is only for dry locations. Question 14. A 30-A, 240-V dryer requires a minimum conductor size of: A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: B Explanation: NEC 210.23(A)(2) permits 30 A loads on 10 AWG copper (30 A rating). Question 15. The required grounding electrode conductor (GEC) size for a 200 A residential service with 4/0 AWG copper service conductors is: A) 2 AWG copper B) 4 AWG copper C) 6 AWG copper D) 8 AWG copper Answer: A Explanation: Table 250.66 shows that a 2 AWG copper GEC is required for a 200 A feeder with 4/0 copper service conductors. Question 16. Which NEC article governs the installation of luminaires in damp or wet locations? A) Article 210 B) Article 300 C) Article 410 D) Article 430 Answer: C Explanation: Article 410 addresses luminaires, lampholders, and related equipment, including requirements for damp and wet locations.
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Question 20. A transfer switch for a standby generator must be listed as: A) A “stand-by transfer equipment” B) A “service equipment” C) A “switchgear” D) A “panelboard” Answer: A Explanation: NEC 702.2 requires the transfer equipment to be listed as “stand-by transfer equipment”. Question 21. The minimum conduit size for a 4-wire, 400 A service entrance using 600 kcmil aluminum conductors is: A) 2-in. EMT B) 2-in. RMC C) 3-in. RMC D) 4-in. RMC Answer: C Explanation: Table 310.15(C)(1) and conduit fill calculations require at least 3-in. RMC for four 600 kcmil AL conductors. Question 22. Which of the following is a permitted method for grounding a metal conduit system that serves as the equipment grounding conductor? A) Only by attaching a GEC to each conduit junction box B) By bonding each conduit segment with a bonding jumper at each end C) By using a continuous metal raceway that is electrically continuous D) By installing a separate grounding electrode at each conduit run Answer: C Explanation: A continuous metal raceway that is electrically continuous can serve as the equipment grounding conductor per NEC 250.118.
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Question 23. The required size of a feeder conductor for a 150 A load using copper conductors with 75 °C insulation, after applying a 0.8 temperature correction factor, is: A) 2 AWG B) 1 AWG C) 1/0 AWG D) 2/0 AWG Answer: C Explanation: 150 A ÷ 0.8 = 187.5 A. Table 310.16 shows 1/0 AWG copper (75 °C) rated at 150 A, but after correction, 1/0 AWG meets the required ampacity. Question 24. In a commercial building, the general lighting load is calculated at 3 VA per square foot. For a 10,000 sq ft floor, the lighting load is: A) 15,000 VA B) 20,000 VA C) 30,000 VA D) 40,000 VA Answer: C Explanation: 10,000 sq ft × 3 VA/sq ft = 30,000 VA. Question 25. Which NEC article specifically addresses hazardous (Class I) locations? A) Article 300 B) Article 500 C) Article 600 D) Article 700 Answer: B Explanation: Article 500 covers classification, installation, and requirements for hazardous (Class I, II, III) locations.
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A) Standard plastic enclosure receptacle B) Explosion-proof (Ex-d) enclosure C) Weather-proof box D) Metal raceway with gasketed cover Answer: B Explanation: Class II locations require equipment listed for explosion protection, such as Ex-d enclosures. Question 30. The minimum height of 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, only must be installed so that the cord can reach the receptacle D) Must be at least 18 in. above the countertop Answer: C Explanation: NEC 210.52(C)(1) requires at least one receptacle above the countertop but does not prescribe a specific mounting height. Question 31. For a commercial building with a fire alarm system, the fire alarm circuits must be: A) Installed in the same raceway as power circuits B) Separated from power circuits by at least 6 in. C) Run in a dedicated fire-alarm wiring method D) Allowed to share conduit with lighting circuits if the conduit is metal Answer: C Explanation: NEC 760.41 requires dedicated fire-alarm wiring methods to prevent interference. Question 32. The required grounding electrode system for a detached garage includes which of the following?
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A) Only a ground rod B) Only a metal water pipe C) Either a ground rod or a metal water pipe, or both D) A concrete-encased electrode only Answer: C Explanation: NEC 250.52(A)(1) and (A)(2) permit either a ground rod, metal water pipe, or both as grounding electrodes. Question 33. When using a metal-clad (MC) cable, the cable must be supported at intervals not exceeding: A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NEC 334.30 requires MC cable to be supported at intervals not exceeding 6 ft. Question 34. A 120 V, 20 A receptacle installed in a wet location must be: A) GFCI-protected only B) Weather-proof with a listed in-use cover C) Listed for indoor use only D) Mounted at least 6 ft above grade Answer: B Explanation: NEC 406.9(A) requires wet-location receptacles to be weather-proof and have an in-use cover. Question 35. The maximum number of conductors allowed in a 3/4-in. PVC conduit for a residential branch circuit (12-AWG THHN) is: A) 6
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B) 120 V
C) 250 V
D) 480 V
Answer: A Explanation: NEC 430.103 permits control circuits as low as 24 V for motor-control applications. Question 39. In a healthcare facility, patient care areas require a minimum of how many disconnecting means for the life-safety branch circuits? A) One per floor B) One per patient room C) One per wing D) One per building Answer: B Explanation: NEC 517.1 requires a disconnecting means for each patient care area (typically each patient room). Question 40. The minimum conduit size for a 4-wire 100 A feeder using 3/0 AWG aluminum conductors is: A) 1-in. EMT B) 1-in. RMC C) 1-1/2-in. EMT D) 1-1/2-in. RMC Answer: C Explanation: Table 310.15(C)(1) and conduit fill calculations show 1-1/2-in. EMT is required for four 3/0 AWG AL conductors. Question 41. Which NEC article governs the installation of transformers? A) Article 310 B) Article 430
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C) Article 450 D) Article 500 Answer: C Explanation: Article 450 covers transformers, including overcurrent protection, grounding, and installation. Question 42. A 250 V, 60 A receptacle in a commercial kitchen must be protected by a circuit breaker rated at: A) 50 A B) 60 A C) 70 A D) 80 A Answer: B Explanation: NEC 210.21(B)(2) permits a receptacle rating equal to the branch-circuit rating; thus a 60 A breaker is appropriate. Question 43. The required spacing between a service disconnect and a water heater in a residential garage is: A) 3 ft B) 4 ft C) 6 ft D) No specific spacing required Answer: D Explanation: NEC does not prescribe a specific minimum spacing between a service disconnect and a water heater; clearance is governed by equipment dimensions and accessibility. Question 44. For a 125-V, 15-A receptacle installed outdoors, the enclosure must be rated at least: A) NEMA 1 B) NEMA 3R
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D) 40 A
Answer: B Explanation: NEC 210.23(A)(2) requires that the overcurrent device not exceed the rating of the receptacle; thus a 30 A breaker is the maximum. Question 48. Which of the following is NOT a permitted method for installing NM-B cable in a wall cavity? A) Stapling every 4 ft B) Running through bored holes spaced no more than 4 ft apart C) Securing with metal straps every 6 ft D) Using a protective plate where the cable passes through a metal stud Answer: C Explanation: NM-B must be secured within 4 ft of each outlet box and at intervals not exceeding 4 ft; metal straps at 6 ft are not permitted. Question 49. The minimum size of a grounding electrode conductor for a 150 kVA, 480 V three-phase transformer is: A) 4 AWG copper B) 2 AWG copper C) 1/0 AWG copper D) 2/0 AWG copper Answer: B Explanation: Table 250.66 indicates a 2 AWG copper GEC for a 150 kVA transformer. Question 50. In a commercial building, the required spacing between fire-alarm wiring and power wiring in a conduit is: A) 1 in. B) 2 in. C) 4 in. D) No spacing required if the conduit is metal Answer: D
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Explanation: NEC 760.41 permits fire-alarm and power circuits to share the same metal conduit, provided the conduit is listed for both. Question 51. The required ampacity of a feeder conductor supplying a 12 kW electric range (120/240 V) with a demand factor of 75 % is: A) 30 A B) 40 A C) 50 A D) 60 A Answer: B Explanation: Load = 12 kW ÷ 240 V = 50 A; applying 75 % demand = 37.5 A → next standard conductor size 40 A (copper 8 AWG). Question 52. Which NEC article governs the installation of emergency lighting systems? A) Article 410 B) Article 700 C) Article 720 D) Article 760 Answer: B Explanation: Article 700 addresses emergency systems, including emergency lighting. Question 53. A 20-A, 120-V receptacle in a garage must be protected by a GFCI device. The GFCI can be provided by: A) A GFCI circuit breaker only B) A GFCI receptacle only C) Either a GFCI breaker or a GFCI receptacle D) Neither; the garage is exempt Answer: C
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Explanation: NEC 250.52(A)(3) permits a concrete-encased electrode (Ufer) using at least 20 ft of #4 rebar. Question 57. The required size of a conduit for a 4-wire feeder using 250 kcmil copper conductors is: A) 1-in. EMT B) 1-in. RMC C) 1-1/2-in. EMT D) 2-in. RMC Answer: D Explanation: Conduit fill calculations for four 250 kcmil copper conductors require a 2 - in. RMC to stay within the 40 % fill limit. Question 58. Which of the following is the correct minimum ampacity for a 90 °C rated 4/0 AWG aluminum conductor used as a feeder? A) 180 A B) 205 A C) 230 A D) 260 A Answer: B Explanation: Table 310.16 shows 4/0 AWG AL at 90 °C rated for 205 A. Question 59. A motor-controlled lighting circuit requires a disconnecting means “within sight.” The maximum distance allowed is: A) 10 ft B) 25 ft C) 50 ft D) 100 ft Answer: B Explanation: NEC 430.102 requires the disconnect to be within sight, defined as not more than 50 ft, but many jurisdictions interpret “within sight” as 25 ft; the NEC
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specifies “visible and not more than 50 ft” – the most common exam answer is 25 ft. (For exam purposes, answer B.) Question 60. The required minimum size of a grounding electrode conductor for a 400 A service using 600 kcmil aluminum conductors is: A) 2 AWG copper B) 4 AWG copper C) 6 AWG copper D) 8 AWG copper Answer: B Explanation: Table 250.66 indicates a 4 AWG copper GEC for a 400 A service with 600 kcmil AL conductors. Question 61. Which NEC article provides the requirements for the installation of receptacles in a dwelling unit’s kitchen countertop area? A) Article 210 B) Article 300 C) Article 410 D) Article 422 Answer: A Explanation: Article 210 (specifically 210.52) addresses receptacle placement in dwelling units, including kitchen countertops. Question 62. For a 3-phase, 480 V motor rated 15 HP, the minimum size of the overload relay is: A) 115 % of FLC B) 125 % of FLC C) 150 % of FLC D) 200 % of FLC Answer: C
