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Journeyman Electrician
Ultimate Exam
Question 1. Which of the following equations correctly represents Ohm’s Law? A) P = I × V B) V = I × R C) I = V / P D) R = P / I Answer: B Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R), i.e., V = I × R. Question 2. In a series circuit containing three resistors of 2 Ω, 4 Ω, and 6 Ω, the total resistance is: A) 12 Ω B) 4 Ω C) 6 Ω D) 8 Ω Answer: A Explanation: Series resistance adds directly: 2 + 4 + 6 = 12 Ω. Question 3. A 240-V, 20-A circuit will have a power consumption of: A) 4,800 W B) 12,000 W C) 3,200 W D) 5,000 W Answer: A Explanation: Power = V × I = 240 V × 20 A = 4,800 W.
Journeyman Electrician
Ultimate Exam
Question 4. Which NEC article defines the term “grounded conductor”? A) Article 100 B) Article 250 C) Article 300 D) Article 430 Answer: A Explanation: Article 100 provides definitions for NEC terminology, including “grounded conductor”. Question 5. The demand factor for a dwelling unit’s lighting load is: A) 100% B) 75% C) 30% D) 50% Answer: C Explanation: NEC Table 220.42 allows a 30% demand factor for the first 3,000 VA of lighting load in a dwelling. Question 6. For a 120-V, 15-A branch circuit, the minimum size copper conductor required by NEC Table 310.15(B)(16) is: A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG
Journeyman Electrician
Ultimate Exam
D) 6 AWG copper Answer: B Explanation: Table 250.122 specifies 10 AWG copper for a 100-A service. Question 10. Which conduit type is permitted for use in wet locations without additional corrosion protection? A) Rigid Metal Conduit (RMC) B) Electrical Metallic Tubing (EMT) C) Polyvinyl Chloride (PVC) conduit D) Flexible Metal Conduit (FMC) Answer: C Explanation: PVC conduit is non-metallic and approved for wet locations. Question 11. The maximum number of 12-AWG conductors allowed in a 3/4-in. EMT without exceeding the 40% fill rule is: A) 8 B) 9 C) 10 D) 12 Answer: B Explanation: 3/4-in. EMT has a cross-sectional area of 0.533 in². A 12-AWG THHN conductor occupies 0.0133 in². 40% of 0.533 = 0.213 in²; 0.213 / 0.0133 ≈ 16, but NEC limits to 9 conductors for 12-AWG in 3/4-in. EMT (NEC Table 1, Chapter 9). Question 12. A junction box must have a volume of at least:
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A) 30 cu in per conductor B) 40 cu in per conductor C) 20 cu in per conductor D) 25 cu in per conductor Answer: C Explanation: NEC 314.16 requires 20 cu in of box volume for each insulated conductor that terminates or passes through. Question 13. The minimum distance a receptacle must be located from a bathtub rim in a residential bathroom is: A) 3 ft B) 6 ft C) 12 in D) 24 in Answer: A Explanation: NEC 210.8(A)(3) requires at least 3 ft horizontal distance from the edge of a bathtub. Question 14. Which type of GFCI protection is required for a receptacle installed in a swimming pool equipment room? A) GFCI breaker in the panel only B) GFCI receptacle only C) Both GFCI breaker and GFCI receptacle D) No GFCI required Answer: C
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Ultimate Exam
C) 15 kA D) 25 kA Answer: B Explanation: NEC 430.102(A)(1) requires motor-controller enclosures to have an SCCR of at least 10 kA. Question 18. In Michigan, which statutory act governs the licensing of journeyman electricians? A) Michigan Electrical Licensing Act of 2018 B) Skilled Trades Regulation Act (PA 407) C) Michigan Construction Code of 2020 D) Electrical Workers’ Safety Act Answer: B Explanation: PA 407, enacted in 2016, regulates skilled trades licensing, including electricians, in Michigan. Question 19. A 120/240-V single-phase service requires how many hot conductors? A) One B) Two C) Three D) Four Answer: B Explanation: A 120/240-V single-phase service uses two hot conductors (each 120 V to neutral, 240 V between them).
Journeyman Electrician
Ultimate Exam
Question 20. When calculating a feeder voltage drop, which of the following must be considered? A) Conductor temperature rating only B) Length, conductor size, material, and load current C) Only the load current D) Only the conduit fill Answer: B Explanation: Voltage drop depends on length, conductor cross-section, material (copper/aluminum), and the current flowing. Question 21. The minimum clearance between a non-grounded (hot) conductor and a grounded (neutral) conductor in a raceway is: A) 1 in B) 0.5 in C) No clearance required if insulated D) 2 in Answer: C Explanation: NEC does not require a specific clearance between insulated conductors; they may be adjacent. Question 22. Which of the following devices is required to be listed and labeled for use in a Class III (dust) hazardous location? A) Standard incandescent lamp B) Explosion-proof motor-starter C) Non-sealed fluorescent fixture D) Ordinary receptacle
Journeyman Electrician
Ultimate Exam
A) 55 A
B) 60 A
C) 65 A
D) 70 A
Answer: B Explanation: NM-B is rated for 60 A at 75 °C per NEC Table 334.80. Question 26. A transformer secondary is grounded at the transformer. According to NEC, the primary must also be: A) Ungrounded B) Grounded C) Connected to a separate grounding electrode D) Isolated from ground Answer: A Explanation: NEC 250.30 requires only one point of grounding; if the secondary is grounded, the primary remains ungrounded. Question 27. In a commercial building, the required number of disconnecting means for a fire pump motor is: A) One per pump B) One per building floor C) One per fire alarm system D) None required Answer: A Explanation: NEC 695.8 requires a dedicated disconnecting means for each fire pump motor.
Journeyman Electrician
Ultimate Exam
Question 28. Which of the following is the correct minimum size for a grounding electrode conductor connected to a 200-A service using copper? A) 12 AWG B) 10 AWG C) 8 AWG D) 6 AWG Answer: C Explanation: Table 250.66 shows 8 AWG copper for a 200-A service. Question 29. The maximum number of conductors allowed in a 1-in. schedule 40 PVC conduit for 14-AWG THHN is: A) 9 B) 12 C) 15 D) 18 Answer: D Explanation: 1-in. PVC has 0.864 in² internal area; 14-AWG THHN occupies 0.0102 in². 40% fill = 0.345 in²; 0.345 / 0.0102 ≈ 33, but NEC limits to 18 conductors for 14-AWG in 1-in. PVC (per Table 1, Chapter 9). Question 30. A receptacle installed in a garage must be GFCI-protected. Which of the following is an acceptable method? A) Installing a GFCI receptacle at the garage outlet only B) Using a standard receptacle and a GFCI breaker in the panel C) Either A or B D) Neither A nor B
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B) Relying on the conduit’s continuity alone C) Installing a grounding screw at each box D) Using a listed bonding strap Answer: C Explanation: Grounding screws alone do not provide a continuous bond; a bonding jumper or strap is required. Question 34. The NEC defines “arc-fault circuit interrupter” (AFCI) protection as required for which of the following areas? A) Kitchens B) Bedrooms C) Bathrooms D) Garages Answer: B Explanation: NEC 210.12(A) requires AFCI protection for all 120-V, 15- and 20-A branch circuits supplying outlets in bedrooms. Question 35. A 3-phase, 4-wire, 480-V feeder supplies a motor. The neutral conductor must be sized based on: A) The motor’s full-load current B) The feeder’s ampacity C) The largest unbalanced load on the system D) The voltage rating of the conduit Answer: C Explanation: Neutral size is determined by the maximum expected unbalanced load, not the motor’s current.
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Question 36. In a commercial building, the required fire-alarm wiring must be installed in: A) Any conduit type B) Rigid metal conduit only C) EMT only D) Listed fire-alarm raceway Answer: D Explanation: NEC 760.41 requires fire-alarm circuits to be installed in raceways listed for fire-alarm use. Question 37. The minimum size of a grounding electrode conductor for a 400-A service using aluminum is: A) 6 AWG B) 4 AWG C) 2 AWG D) 1/0 AWG Answer: D Explanation: Table 250.66 indicates 1/0 AWG aluminum for a 400-A service. Question 38. Which NEC article specifically addresses requirements for swimming pool equipment? A) Article 680 B) Article 690 C) Article 500 D) Article 300
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B) It adds a new requirement for GFCI protection in unfinished basements. C) It reduces the allowable voltage drop to 1% for all feeders. D) It allows the use of non-metallic conduit in hazardous locations. Answer: B Explanation: NEC 2023 expands GFCI protection to include unfinished basements. Question 42. The minimum height for a receptacle installed in a garage is: A) 12 in above the floor B) 18 in above the floor C) 24 in above the floor D) No minimum height Answer: B Explanation: NEC 210.52(G) requires garage receptacles to be installed not less than 18 in above the floor. Question 43. Which of the following is the correct NEC reference for the calculation of conductor ampacity adjustment factors for more than three current-carrying conductors? A) Table 310.15(B)(3)(a) B) Table 310. C) Table 310. D) Table 310.15(B)(2) Answer: A Explanation: Table 310.15(B)(3)(a) provides adjustment factors for more than three current-carrying conductors in a raceway or cable.
Journeyman Electrician
Ultimate Exam
Question 44. A 30-A, 240-V, single-phase dryer circuit requires a minimum conduit fill of: A) 40% for EMT B) 30% for PVC C) 35% for RMC D) 45% for flexible metal conduit Answer: A Explanation: NEC requires a maximum of 40% conduit fill for raceways containing more than two conductors (including the equipment grounding conductor). Question 45. In a residential service panel, the main breaker is rated at 200 A. The minimum size of the service grounding electrode conductor (copper) is: A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: B Explanation: Table 250.66 specifies 6 AWG copper for a 200-A service. Question 46. Which of the following devices must be listed for use in a Class II (dust) environment? A) Standard motor starter B) Explosion-proof lighting fixture C) Non-sealed circuit breaker D) Standard receptacle
Journeyman Electrician
Ultimate Exam
A) Article 410 B) Article 300 C) Article 430 D) Article 500 Answer: A Explanation: Article 410 covers luminaires, including requirements for wet locations. Question 50. For a 150-A feeder using 75 °C rated copper conductors, the minimum conductor size is: A) 1/0 AWG B) 2/0 AWG C) 3/0 AWG D) 4/0 AWG Answer: B Explanation: Table 310.15(B)(16) shows 2/0 AWG copper with a 75 °C rating is rated for 175 A, satisfying a 150-A feeder. Question 51. A 240-V, 30-A dryer circuit must be protected by a breaker that is rated at: A) 25 A B) 30 A C) 35 A D) 40 A Answer: B
Journeyman Electrician
Ultimate Exam
Explanation: The breaker must be sized to the circuit’s ampacity; a 30-A dryer requires a 30-A breaker. Question 52. The NEC permits the use of aluminum conductors in branch circuits provided they are: A) 90 °C rated only B) Used with aluminum terminations listed for aluminum C) Larger than copper equivalents by any amount D) Protected by a GFCI device Answer: B Explanation: Aluminum conductors must be terminated in devices listed for aluminum to prevent corrosion and overheating. Question 53. Which of the following is the correct method to calculate the demand load for a dwelling’s kitchen appliances according to NEC Table 220.55? A) Sum of nameplate ratings B) 100% of the two largest appliances plus 50% of the remainder C) 150% of the largest appliance only D) 40% of the total connected load Answer: B Explanation: NEC Table 220.55 uses the “two largest appliances at 100% and the remainder at 50%” calculation method. Question 54. The minimum height for a light fixture installed over a bathtub is: A) 6 ft B) 7 ft C) 8 ft
