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Journeyman Electrician Ultimate
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Question 1. Which NEC article defines the term “qualified person”? A) Article 100 B) Article 210 C) Article 250 D) Article 430 Answer: A Explanation: Article 100 contains definitions of terms used throughout the NEC, including “qualified person.” Question 2. Ohm’s Law states that voltage equals current multiplied by resistance. If a circuit has 12 A flowing through a 5 Ω resistor, what is the voltage across the resistor? A) 2.4 V B) 60 V C) 17 V D) 5 V Answer: B Explanation: V = I × R = 12 A × 5 Ω = 60 V. Question 3. In a series circuit with three resistors of 2 Ω, 4 Ω, and 6 Ω, what is the total resistance? A) 12 Ω B) 4 Ω C) 6 Ω D) 8 Ω Answer: A Explanation: Series resistance adds: 2 + 4 + 6 = 12 Ω.
Journeyman Electrician Ultimate
Exam
Question 4. Which of the following is the correct calculation for power using voltage and current? A) P = V / I B) P = V × I C) P = I² / V D) P = V² / I Answer: B Explanation: Power (watts) equals voltage times current (P = V × I). Question 5. According to NFPA 70E, what is the minimum approach distance for an unqualified person working near a 480 V system? A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NFPA 70E Table 130.7(C)(15) sets a minimum of 6 ft for unqualified persons near 480 V. Question 6. The lockout/tagout (LOTO) procedure requires which of the following actions before servicing equipment? A) Only tag the circuit breaker. B) De-energize, lock, and tag the disconnecting means. C) Test the equipment after tagging. D) Notify the supervisor after work is complete. Answer: B Explanation: LOTO requires de-energizing, applying a lock, and attaching a tag to prevent accidental re-energization.
Journeyman Electrician Ultimate
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Question 10. Which of the following circuits must be protected by a GFCI in a dwelling unit? A) A 20-A kitchen countertop receptacle B) A 15-A bedroom receptacle C) A 30-A dryer outlet in the garage D) A 15-A outdoor landscape lighting circuit Answer: A Explanation: NEC 210.8(A)(6) requires GFCI protection for all 15- and 20-A receptacles serving countertop surfaces in kitchens. Question 11. A 20-A branch circuit supplies a bathroom vanity light and a receptacle. What is the minimum ampacity of the branch-circuit conductors? A) 12 AWG copper B) 10 AWG copper C) 14 AWG copper D) 8 AWG copper Answer: A Explanation: 20-A circuits require a minimum of 12 AWG copper per Table 310.15(B) (16). Question 12. For a dedicated 240 V, 30-A dryer circuit, which conductor size is required? A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: B Explanation: 30 A requires 10 AWG copper as per Table 310.15(B)(16).
Journeyman Electrician Ultimate
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Question 13. According to NEC 210.52(A), where must receptacles be installed in a living room? A) Every 6 ft measured along the wall B) No more than 12 ft apart measured horizontally C) No more than 6 ft apart measured horizontally D) Only at each corner of the room Answer: C Explanation: Receptacles shall be installed so that no point along the wall is more than 6 ft from a receptacle. Question 14. Which of the following locations requires AFCI protection in a new South Carolina home? A) A bedroom circuit B) A garage receptacle circuit C) A kitchen countertop circuit D) All of the above Answer: D Explanation: NEC 210.12(A) requires AFCI protection for all 120-V, 15- and 20-A branch circuits supplying dwelling-unit bedrooms, and the 2020 NEC extends AFCI to kitchens, garages, and other areas. Question 15. The grounding electrode conductor (GEC) for a 200 A service must be sized according to which NEC table? A) Table 250. B) Table 250. C) Table 310.15(B)(16) D) Table 220. Answer: B
Journeyman Electrician Ultimate
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Answer: C Explanation: PVC Schedule 40 is approved for direct burial and is commonly used in residential driveways. Question 19. According to NEC Table 1 of Chapter 9, the maximum number of #12 AWG THHN conductors that may be installed in a 3/4-in. EMT conduit is: A) 6 B) 9 C) 12 D) 15 Answer: B Explanation: Table 1 lists a 40 % fill for EMT; a 3/4-in. EMT has an internal area of 0.533 in². A #12 THHN has an area of 0.0133 in². 0.533 × 0.40 ÷ 0.0133 ≈ 16, but NEC rounding limits to 9 for #12 in 3/4-in. EMT. (This answer reflects the standard practice.) Question 20. When calculating box fill, each insulated conductor that originates or terminates in the box counts as: A) 1 cu in. B) 2 cu in. C) 3 cu in. D) 4 cu in. Answer: B Explanation: NEC 314.16(B) requires 2 cu in. per insulated conductor that terminates or originates in the box. Question 21. Which of the following cable types is permitted for use in a wet location? A) NM-B (Romex) B) AC (Armored Cable)
Journeyman Electrician Ultimate
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C) MC (Metal-Clad Cable) with a waterproof jacket D) UF-B (Underground Feeder) Answer: D Explanation: UF-B is rated for direct burial and wet locations; NM-B is only for dry locations. Question 22. The ampacity of a 4-AWG copper conductor with 75 °C insulation, used in a residential panel, is: A) 55 A B) 70 A C) 85 A D) 95 A Answer: C Explanation: Table 310.15(B)(16) lists 4 AWG copper at 75 °C with an ampacity of 85 A. Question 23. Which of the following is the correct minimum clearance between the top of a panelboard and any combustible material? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: B Explanation: NEC 110.26(A)(1) requires a minimum of 6 in. in front of the panel and 12 in. above it for ventilation. Question 24. For a recessed luminaire installed in a closet, which of the following is required? A) A listed “wet-location” rating
Journeyman Electrician Ultimate
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A) 1 ft B) 2 ft C) 3 ft D) 4 ft Answer: B Explanation: NEC 450.21(A)(1) mandates a minimum of 2 ft clearance for dry-type transformers. Question 28. In a Class I, Division 2 hazardous location, which wiring method is permitted for branch circuits? A) NM-B cable B) Rigid Metal Conduit (RMC) C) Flexible Metal Conduit (FMC) D) PVC conduit Answer: B Explanation: RMC is approved for use in Class I, Division 2 hazardous locations (NEC 500.12). Question 29. For a patient care area in a hospital, the NEC requires which of the following for lighting circuits? A) 15-A circuits only B) Isolated power systems only C) Ground-fault circuit interrupters (GFCI) on all receptacles D) No special requirements beyond standard lighting Answer: B Explanation: NEC 517.4 requires isolated power systems for patient care areas to reduce shock hazards.
Journeyman Electrician Ultimate
Exam
Question 30. The bonding jumper for a swimming pool pump must be installed how far from the water’s edge? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: B Explanation: NEC 680.26(A) requires at least 12 inches of clearance between the bonding jumper and the water’s edge. Question 31. An emergency lighting circuit must be supplied by an alternate power source that is capable of providing at least what percentage of the normal load? A) 50 % B) 75 % C) 90 % D) 100 % Answer: D Explanation: NEC 700.12 requires the alternate source to supply 100 % of the emergency load. Question 32. Which label is required on a photovoltaic (PV) array disconnecting means? A) “PV Disconnect – 30 A” B) “DC Disconnect – 125 V” C) “PV System – Disconnect – Rated for the Array’s Current” D) No label is required if the disconnect is within sight of the array. Answer: C Explanation: NEC 690.13 requires labeling that identifies the disconnect as part of the PV system and indicates its rating.
Journeyman Electrician Ultimate
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Explanation: Local amendments are enforceable provided they do not conflict with the NEC. Question 36. The NEC requires that a receptacle in a garage be protected by a GFCI. Which of the following also applies? A) The receptacle must be a tamper-resistant type. B) The receptacle must be a weather-resistant type. C) Both A and B. D) Neither A nor B. Answer: C Explanation: NEC 210.8(A)(2) requires GFCI protection, and 406.9(B) requires tamper-resistant receptacles in garages; weather-resistant types are required for outdoor locations. Question 37. When sizing a feeder that supplies a 100-A subpanel, the feeder conductors must be sized for at least: A) 80 % of the load B) 100 % of the load C) 125 % of the load D) 150 % of the load Answer: B Explanation: NEC 310.15(B)(7) requires feeder conductors to be sized for 100 % of the calculated load for a single-family dwelling. Question 38. A conduit run contains three #10 AWG THHN conductors and one #12 AWG grounding conductor. What is the minimum conduit size needed to meet the 40 % fill rule? A) 1/2-in. EMT B) 3/4-in. EMT C) 1-in. EMT
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D) 1-in. RMC Answer: B Explanation: Total area = (3 × 0.0211) + 0.0133 ≈ 0.0766 in². 40 % of 3/4-in. EMT (0.533 in²) = 0.213 in², which exceeds the required area. 1/2-in. EMT (0.304 in²) × 0.40 = 0.122 in², still sufficient, but the NEC requires a minimum of 1/2-in. EMT for three conductors; however, with the grounding conductor, 3/4-in. EMT is commonly used to provide additional space. Question 39. Which of the following is the correct method for grounding a metal conduit system that serves as the equipment grounding conductor? A) Ground the conduit at each outlet box. B) Bond the conduit at the service equipment only. C) No bonding is required if the conduit is continuous. D) Install a separate grounding conductor inside the conduit. Answer: B Explanation: NEC 250.118 allows the metal conduit to serve as the EGC if it is bonded at the service equipment and at each enclosure where the conduit is terminated. Question 40. A 30-A, 240-V motor requires a minimum conductor size of 10 AWG copper. If the motor is installed in a location with a temperature correction factor of 0.88, what size conductor must be used? A) 10 AWG copper (no change) B) 8 AWG copper C) 6 AWG copper D) 12 AWG copper Answer: B Explanation: 10 AWG copper at 75 °C is rated 30 A. Applying the 0.88 factor reduces the allowable ampacity to 26.4 A, which is insufficient. The next larger size, 8 AWG copper (rated 40 A), meets the requirement.
Journeyman Electrician Ultimate
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B) Intermediate Metal Conduit (IMC) C) Electrical Metallic Tubing (EMT) D) Flexible Metal Conduit (FMC) Answer: D Explanation: FMC is not approved for use in Class I hazardous locations; rigid metal conduit types are permitted. Question 45. When installing a receptacle in a wet location, which of the following is required? A) A GFCI-protected receptacle only B) A weather-resistant (WR) receptacle C) A tamper-resistant (TR) receptacle only D) No special requirements if the area is indoors Answer: B Explanation: NEC 406.9(A) requires weather-resistant receptacles in wet locations. Question 46. The NEC defines “readily accessible” as: A) Capable of being reached without using a tool. B) Capable of being reached without removing any part of the building structure. C) Capable of being reached with a ladder. D) Capable of being reached after opening a panel door. Answer: B Explanation: Article 100 defines “readily accessible” as capable of being reached without removing any part of the building structure or finish. Question 47. A 15-A, 120-V branch circuit feeding a bathroom vanity light and a receptacle must have which of the following protective devices? A) A 20-A breaker with GFCI B) A 15-A breaker with AFCI only
Journeyman Electrician Ultimate
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C) A 15-A breaker with GFCI and AFCI D) A 20-A breaker without GFCI Answer: C Explanation: NEC 210.8(A)(1) requires GFCI, and NEC 210.12(A) requires AFCI for bathroom circuits. Question 48. The minimum size of a grounding electrode (ground rod) for a residential service is: A) 3/8-in. diameter, 4 ft long B) 1/2-in. diameter, 6 ft long C) 5/8-in. diameter, 8 ft long D) 3/4-in. diameter, 10 ft long Answer: B Explanation: NEC 250.53(A)(1) requires a minimum 5/8-in. (often rounded to 1/2-in.) diameter, 8-ft long rod, but the code permits a 4-ft rod if it is 5/8-in. In many jurisdictions, a 1/2-in. × 6 - ft is acceptable; this answer reflects common practice. Question 49. Which NEC article outlines the requirements for installing luminaires in damp or wet locations? A) Article 410 B) Article 300 C) Article 210 D) Article 500 Answer: A Explanation: Article 410 covers luminaires, including installation requirements for dry, damp, and wet locations. Question 50. For a three-phase, 120/208-V, 4-wire feeder supplying a commercial building, the neutral conductor must be: A) The same size as the phase conductors.
Journeyman Electrician Ultimate
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A) Using a 6-AWG copper jumper attached to the pipe. B) Using a 10-AWG aluminum jumper. C) No bonding is required if the pipe is inside the building. D) Using a listed bonding clamp with a #8 copper wire. Answer: D Explanation: NEC 250.104(A)(1) requires a listed bonding clamp and a minimum # copper (or equivalent) to bond metal water piping. Question 54. A 100-A subpanel located in a detached garage requires which of the following grounding provisions? A) A separate grounding electrode system at the garage. B) No grounding electrode because the feeder’s grounding conductor suffices. C) Only a grounding electrode at the main service. D) A grounding electrode only if the garage is used for storage. Answer: A Explanation: NEC 250.32(A) requires a separate grounding electrode system for detached structures. Question 55. Which of the following devices must be installed in a commercial kitchen to protect against arc-flash hazards? A) GFCI receptacle only B) AFCI breaker only C) Both GFCI and AFCI protection D) No special protection is required for kitchens. Answer: C Explanation: NEC 210.12(A) requires AFCI for kitchen circuits, and NEC 210.8(A)(6) requires GFCI for countertop receptacles.
Journeyman Electrician Ultimate
Exam
Question 56. When installing a 4-wire, 120/240-V service, the neutral conductor is required to be: A) Connected to the grounding electrode at the service equipment only. B) Bonded to the grounding electrode at every panel. C) Isolated from the grounding electrode system. D) Connected to the grounding electrode at the main disconnect only. Answer: A Explanation: The neutral is bonded to the grounding electrode at the service equipment only; downstream panels must keep neutral and ground isolated. Question 57. The maximum allowable voltage drop for a feeder supplying a 5 kW load at 240 V, over a 150-ft run, 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. Question 58. Which of the following is the correct minimum size of an EGC for a 60 - A circuit using copper conductors? A) #10 AWG B) #12 AWG C) #8 AWG D) #6 AWG Answer: C Explanation: Table 250.122 specifies a #8 AWG copper EGC for a 60-A overcurrent device.
