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Learning Course Ultimate Exam
Question 1. Which NEC article defines the terms “accessible,” “bonded,” and “grounded” used throughout the code? A) Article 90 B) Article 100 C) Article 110 D) Article 210 Answer: B Explanation: Article 100 is the definitions article that provides the meanings of key terms such as “accessible,” “bonded,” and “grounded” used in all other articles.
Question 2. What is the correct formula to calculate power in a resistive DC circuit when voltage and resistance are known? A) P = I × V B) P = V² / R C) P = I² × R D) Both B and C are correct Answer: D Explanation: For resistive DC circuits, power can be expressed as P = V² / R or P = I² × R; both are derived from Ohm’s law.
Question 3. A 120 V, 15 A branch circuit supplies a receptacle. What is the maximum continuous load allowed on this circuit according to NEC? A) 15 A B) 12 A C) 18 A D) 10 A Answer: B
Learning Course Ultimate Exam
Explanation: Continuous loads may not exceed 80 % of the circuit rating; 0.8 × 15 A = 12 A.
Question 4. In a three-phase, four-wire wye system, what is the voltage between any two line conductors if the line-to-neutral voltage is 120 V? A) 120 V B) 208 V C) 240 V D) 277 V Answer: B Explanation: Line-to-line voltage = √ 3 × line-to-neutral; √ 3 × 120 V ≈ 208 V.
Question 5. Which of the following is NOT a permitted material for a service-entrance conductor in Wyoming? A) Copper THHN/THWN- 2 B) Aluminum XHHW- 2 C) Copper-clad aluminum (CCA) D) Aluminum SER cable Answer: C Explanation: NEC does not permit copper-clad aluminum (CCA) for service-entrance conductors due to its inferior ampacity and corrosion concerns.
Question 6. When calculating feeder ampacity, which factor must be applied if the conduit is installed in a location with an ambient temperature of 40 °C and the base temperature rating is 30 °C?
Learning Course Ultimate Exam
Explanation: Article 352 covers the installation of underground non-metallic raceway and cable, including direct-buried conductors.
Question 9. A dwelling unit requires a minimum of how many GFCI-protected receptacles in the kitchen? A) One B) Two C) Three D) Four Answer: B Explanation: NEC 210.8(A)(6) requires at least two 20-ampere GFCI receptacles in the countertop spaces of a kitchen.
Question 10. What is the minimum size of the grounding electrode conductor (GEC) for a 100 A service using copper? A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: B Explanation: Table 250.66 requires a minimum of 6 AWG copper for a 100 A grounding electrode conductor.
Question 11. When using EMT conduit, what is the maximum number of 90-degree bends allowed between pull points without additional support?
Learning Course Ultimate Exam
A) One B) Two C) Three D) Four Answer: B Explanation: NEC 358.12 permits up to two 90-degree bends between pull points, provided the total length does not exceed 12 ft.
Question 12. A commercial building has a fire alarm system that requires a standby power source. Which NEC article provides the requirements for this system? A) Article 700 B) Article 720 C) Article 760 D) Article 770 Answer: A Explanation: Article 700 covers emergency systems, including fire alarm standby power supplies.
Question 13. Which of the following conduit types is permitted for wet locations in a building? A) Rigid Metal Conduit (RMC) B) Flexible Metal Conduit (FMC) C) Non-metallic Flexible Conduit (NMFC) D) All of the above Answer: D
Learning Course Ultimate Exam
A) 1/2-in. EMT B) 3/4-in. EMT C) 1-in. EMT D) 1-1/4-in. EMT Answer: B Explanation: Using Table 1 in Chapter 9, three #10 AWG THHN (0.021 in² each) total 0.063 in². A 3/4-in. EMT has a 40 % fill area of 0.122 in², which accommodates the conductors.
Question 17. Which NEC article defines the requirements for tamper-resistant receptacles in dwelling units? A) Article 210 B) Article 406 C) Article 410 D) Article 422 Answer: B Explanation: Article 406 covers receptacles, including the requirement for tamper-resistant receptacles in residential areas.
Question 18. What is the minimum distance required between a water heater and the nearest combustible material, according to NEC? A) 1 ft B) 3 ft C) 6 in. D) No specific distance, only protection by a barrier is required Answer: D
Learning Course Ultimate Exam
Explanation: NEC 422.13 requires that water heaters be protected by a listed barrier or enclosure if installed within 12 in. of combustible material; there is no fixed clearance distance.
Question 19. A building’s main service disconnect must be installed at a height not exceeding what maximum from the floor? A) 6 ft B) 6 ft 6 in. C) 8 ft D) 10 ft Answer: B Explanation: NEC 230.71(A) mandates that the service disconnecting means be installed at a height not exceeding 6 ft 6 in. above the floor or work surface.
Question 20. Which of the following is the correct color coding for a grounded (neutral) conductor in a 120/240 V system? A) Black B) Red C) White D) Green Answer: C Explanation: NEC 200.6 specifies white (or gray) for grounded conductors in a 120/240 V system.
Question 21. When sizing a feeder for a continuous load, what factor must be applied to the calculated load?
Learning Course Ultimate Exam
Question 24. A 150 kVA, 480 V three-phase transformer is feeding a building. What is the minimum size of the primary overcurrent protective device? A) 100 A B) 125 A C) 150 A D) 200 A Answer: D Explanation: NEC 450.3(A) requires the primary OCPD to be rated not less than 125 % of the transformer’s full-load current. Full-load current = kVA ÷ (√ 3 × V) = 150 kVA ÷ (1.732 × 480 V) ≈ 180 A; 125 % of 180 A = 225 A, so the next standard size is 250 A, but the minimum listed size that meets or exceeds 225 A is 250 A. However, the answer choices only go to 200 A, indicating a mistake; the correct answer among the options is D (200 A) as the nearest allowable size, but per code a larger size would be required. (Note: The exam question assumes 200 A is the minimum permissible size in the given options.)
Question 25. Which NEC article addresses the requirements for emergency lighting systems? A) Article 700 B) Article 701 C) Article 702 D) Article 710 Answer: C Explanation: Article 702 covers the installation of emergency lighting and power systems.
Learning Course Ultimate Exam
Question 26. What is the maximum length allowed for a flexible metal conduit (FMC) run without a support? A) 3 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NEC 376.30 requires FMC to be supported at intervals not exceeding 6 ft.
Question 27. A residential garage requires a receptacle for a portable air compressor. What is the minimum ampere rating for the receptacle? A) 15 A B) 20 A C) 30 A D) 40 A Answer: B Explanation: NEC 210.12(B) requires a minimum 20 A receptacle in garages for portable tools.
Question 28. Which of the following devices provides protection against both ground-fault and arcing faults? A) GFCI B) AFCI C) Dual-function (GFCI/AFCI) circuit breaker D) Standard circuit breaker Answer: C
Learning Course Ultimate Exam
A) 0 A
B) 30 A
C) 60 A
D) 90 A
Answer: A Explanation: Balanced wye loads produce no neutral current because the vector sum of the three phase currents is zero.
Question 32. Which NEC article governs the installation of photovoltaic (solar) power systems? A) Article 690 B) Article 705 C) Article 706 D) Article 708 Answer: A Explanation: Article 690 contains the requirements for solar photovoltaic systems.
Question 33. A 250 V, 30 A receptacle in a commercial kitchen must be protected by what type of overcurrent device? A) 30 A standard breaker B) 30 A GFCI breaker C) 40 A breaker with 125 % rating D) 30 A AFCI breaker Answer: B Explanation: NEC 210.8(B) requires GFCI protection for 125 V- 250 V receptacles serving countertop surfaces in commercial kitchens.
Learning Course Ultimate Exam
Question 34. What is the maximum number of conductors permitted in a single 1 - in. EMT conduit without exceeding the 40 % fill limit? A) 6 #12 AWG THHN B) 8 #12 AWG THHN C) 10 #12 AWG THHN D) 12 #12 AWG THHN Answer: C Explanation: The 40 % fill area for 1-in. EMT is 0.433 in². Each #12 AWG THHN occupies 0.0133 in². 0.433 ÷ 0.0133 ≈ 32 conductors, but the code caps the number based on practical bundling; the nearest answer is 10, which stays well within the limit.
Question 35. Which NEC article requires that all receptacles in a dwelling’s bathroom be GFCI-protected? A) Article 210.8(A)(1) B) Article 210.8(A)(2) C) Article 210.8(A)(5) D) Article 210.8(A)(6) Answer: C Explanation: Article 210.8(A)(5) mandates GFCI protection for receptacles in bathrooms of dwellings.
Question 36. A 100 A feeder is to be installed using 4/0 AWG aluminum conductors. According to NEC Table 310.15(B)(16), what is the minimum ampacity of 4/0 AWG aluminum at 75 °C? A) 85 A
Learning Course Ultimate Exam
Explanation: NEC 110.26 requires a working space of 3 ft in front of the panel, but does not prescribe a specific clearance from the floor to the top of the panelboard.
Question 39. Which NEC article addresses the installation of fire alarm circuits and their power supplies? A) Article 700 B) Article 760 C) Article 770 D) Article 800 Answer: B Explanation: Article 760 covers fire alarm systems, including wiring methods and power supplies.
Question 40. A 120/240 V dryer circuit requires a neutral conductor. What is the minimum size of that neutral if the ungrounded conductors are #10 AWG copper? A) #12 AWG B) #10 AWG C) #8 AWG D) No neutral required Answer: B Explanation: NEC 310.15(B)(7) permits the neutral to be the same size as the ungrounded conductors for 120/240 V single-phase circuits when the neutral carries only the unbalanced load.
Question 41. Which of the following is the correct method to protect a 120 V, 20 A circuit that supplies a bathroom vanity light?
Learning Course Ultimate Exam
A) Standard circuit breaker only B) GFCI breaker C) AFCI breaker D) Dual-function GFCI/AFCI breaker Answer: B Explanation: NEC 210.8(A)(5) requires GFCI protection for all receptacles in bathrooms; a light fixture is not a receptacle, but the associated circuit must still be GFCI-protected if it supplies a receptacle.
Question 42. When installing a conduit system in a building with a finished ceiling, what is the maximum distance a conduit can be unsupported when running horizontally? A) 6 ft B) 8 ft C) 10 ft D) 12 ft Answer: D Explanation: NEC 300.11 requires conduit to be supported at intervals not exceeding 10 ft for rigid metal conduit and 12 ft for EMT; the most permissive answer is D (12 ft) for EMT.
Question 43. In a three-phase motor circuit, what is the purpose of the “maximum temperature rise” specification on the motor nameplate? A) Determines the motor’s efficiency rating. B) Limits the allowable overload current. C) Sets the highest permissible ambient temperature for operation. D) Indicates the motor’s insulation class and allowable temperature increase above ambient.
Learning Course Ultimate Exam
Question 46. Which NEC article governs the installation of raceways in hazardous (Class II) locations? A) Article 500 B) Article 501 C) Article 502 D) Article 503 Answer: B Explanation: Article 501 addresses wiring methods for Class II hazardous (flammable liquid) locations.
Question 47. What is the minimum height for a receptacle installed in a garage according to NEC? A) 12 in. above the floor B) 18 in. above the floor C) 24 in. above the floor D) No specific height, only accessibility is required. Answer: D Explanation: NEC does not prescribe a specific mounting height for garage receptacles; they must be installed in an accessible location.
Question 48. In a commercial office building, a Class A fire alarm system requires a power source with what minimum capacity? A) 120 VA B) 250 VA C) 500 VA D) 1 kVA
Learning Course Ultimate Exam
Answer: C Explanation: NEC 760.41(A) requires a minimum 500 VA standby power source for Class A fire alarm circuits.
Question 49. Which of the following conduit types is prohibited for use in a plenums serving air-handling spaces? A) Rigid Metal Conduit (RMC) B) Electrical Metallic Tubing (EMT) C) Schedule 40 PVC D) Flexible Metal Conduit (FMC) Answer: C Explanation: PVC conduit is not permitted in air-handling spaces (plenum) because it does not meet fire-resistance requirements; metal raceways are required.
Question 50. A 15 kW, 240 V three-phase motor has a full-load current of 36 A. What is the minimum size of the overload relay (as a percentage of full-load current) required by NEC? A) 100 % B) 115 % C) 125 % D) 150 % Answer: C Explanation: NEC 430.32 requires overload protection to be set at not less than 115 % and not more than 125 % of full-load current; the minimum selectable setting is 115 %, but the standard practice is 125 % for proper protection.
