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Question 1. According to Ohm’s Law, if the voltage across a resistor is 120 V and the resistance is 30 Ω, what is the current? A) 2 A B) 3 A C) 4 A D) 5 A Answer: B Explanation: Ohm’s Law I = V / R = 120 V / 30 Ω = 4 A. (Correction: 120/30 = 4 A, thus answer C). Question 2. In a series circuit with three resistors of 10 Ω, 20 Ω, and 30 Ω, the total resistance is: A) 10 Ω B) 30 Ω C) 60 Ω D) 100 Ω Answer: C Explanation: Series resistance adds directly: 10 + 20 + 30 = 60 Ω. Question 3. Which NEC definition describes a conductor that is intentionally grounded? A) Grounded Conductor B) Equipment Grounding Conductor C) Bonding Jumper D) Ungrounded Conductor Answer: A Explanation: The grounded conductor (normally the neutral) is intentionally connected to earth ground. Question 4. An electrical drawing shows a symbol of a circle with a “T” inside. This symbol represents: A) Switch B) Transformer C) Receptacle D) Junction Box Answer: B Explanation: The NEC schematic symbol for a transformer is a circle with a “T”. Question 5. Convert a 1500 W load to amperes on a 120 V single-phase circuit. A) 6.25 A B) 12.5 A C) 15 A D) 18.75 A Answer: B Explanation: I = P / V = 1500 W / 120 V = 12.5 A.
Journeyman Electrician Ultimate
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Question 6. The minimum size for a service entrance conductor supplying a 100 A service, using copper, is: A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: C Explanation: NEC Table 310.15(B)(16) shows #2 AWG copper rated for 115 A, the next standard size up from 100 A. Question 7. Which of the following is NOT a permitted location for a service disconnect? A) Inside the building envelope B) In the basement near the main panel C) In a detached garage not serving the building D) At the point of entrance of the service conductors Answer: C Explanation: Service disconnects must be at or near the service entrance; a detached garage serving only the garage is a separate building. Question 8. The required clearance between a service drop and a window opening is: A) 3 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NEC 230.24 requires a minimum of 6 ft vertical clearance between service drops and windows, doors, or other openings. Question 9. For a 4-wire, 120/240-V service, how many grounding electrodes are required by NEC 250.53? A) One B) Two C) Three D) Four Answer: A Explanation: A single grounding electrode system is sufficient if it meets the required resistance or size. Question 10. When sizing a grounding electrode conductor (GEC) for a 200 A service with copper, the minimum size is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B
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A) Combination AFCI B) Branch/Feeder AFCI C) Outlet-type AFCI D) No AFCI required Answer: A Explanation: NEC 210.12(A) requires combination AFCI protection for bedroom circuits. Question 16. A 12-AWG copper conductor is used in a 90 °C rated raceway. What is its allowable ampacity for a continuous load? A) 20 A B) 25 A C) 30 A D) 35 A Answer: B Explanation: 12-AWG copper at 90 °C is rated 30 A; for continuous loads, apply 125 % factor, giving 24 A, so the next standard size is 25 A. Question 17. Which conduit fill percentage is allowed for more than two conductors in a raceway? A) 10 % B) 20 % C) 30 % D) 40 % Answer: C Explanation: NEC Chapter 9, Table 1 permits a maximum of 40 % fill for two conductors and 30 % for three or more. Question 18. The maximum number of 14-AWG NM cables that may be placed in a 3/4-in. EMT conduit is: A) 2 B) 3 C) 4 D) 5 Answer: C Explanation: Using Table C.2, 14-AWG NM (approx. 0.13 in²) × 3 = 0.39 in², which is less than 30 % of the 3/4-in. EMT’s 0.533 in² capacity. Question 19. For a commercial building, the required height for mounting a receptacle outlet in a restroom is: A) 12 in. above the floor B) 15 in. above the floor C) 18 in. above the floor D) No height requirement Answer: D Explanation: NEC 406.9 requires receptacles in restrooms to be GFCI protected but does not specify a mounting height.
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Question 20. Which of the following wiring methods is permitted for underground feeder conductors in a residential driveway? A) NM cable B) AC cable C) UF cable D) MC cable Answer: C Explanation: Underground conductors must be rated for direct burial; UF (Underground Feeder) cable is permitted. Question 21. A metal conduit system must be electrically continuous. Which device provides the required continuity? A) Conduit body B) Coupling C) Locknut D) Bonding jumper Answer: D Explanation: A bonding jumper is installed to ensure electrical continuity of metal raceways. Question 22. The minimum size of a grounding electrode conductor for a 400 A service using aluminum conductors is: A) #6 AWG B) #4 AWG C) #2 AWG D) #1/0 AWG Answer: C Explanation: NEC Table 250.66 lists #2 AWG aluminum for a 400 A service. Question 23. Which of the following is considered a “continuous load” per NEC definition? A) A motor that runs for 2 hours at a time B) A lighting circuit that is on for 3 hours daily C) An HVAC system that cycles on and off D) A refrigerator compressor that runs intermittently Answer: B Explanation: A continuous load is any load expected to run for three hours or more continuously. Question 24. The NEC definition of “accessible” means: A) Able to be reached without using tools B) Able to be reached without removing any part of the building structure C) Able to be reached without having to remove a panel or cover D) Able to be reached with a ladder only
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Question 29. A 20-A receptacle in a garage must be protected by which of the following? A) GFCI only B) AFCI only C) Both GFCI and AFCI D) No special protection required Answer: A Explanation: NEC 210.8(A)(2) requires GFCI protection for garage receptacles. Question 30. The required height for a light fixture in a commercial hallway is: A) 6 ft B) 8 ft C) 10 ft D) No specific height, but must provide adequate illumination Answer: D Explanation: NEC does not stipulate a fixed mounting height for hallway luminaires; design is based on illumination levels. Question 31. When using a metal raceway, the grounding conductor may be omitted if: A) The conduit is PVC B) The conduit is EMT and the conductors are all copper C) The conduit is RMC and is properly bonded D) The conduit is FMC and is less than 2 ft long Answer: C Explanation: Metal raceways such as Rigid Metal Conduit (RMC) provide a grounding path when properly bonded, eliminating the need for a separate equipment grounding conductor. Question 32. The NEC requires that a disconnecting means for a motor be located within: A) 6 ft of the motor housing B) 10 ft of the motor housing C) 25 ft of the motor housing D) No specific distance, but must be readily accessible Answer: D Explanation: NEC 430.102 requires the disconnect to be readily accessible, but does not prescribe a specific distance.
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Question 33. The minimum size of a grounding electrode conductor for a 150 kVA, 480-V three-phase service using copper is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: For a 150 kVA service, the calculated current is 180 A; Table 250. calls for #6 AWG copper. Question 34. Which of the following is NOT permitted as a bonding jumper in a raceway system? A) Bare copper wire B) Green insulated copper wire C) Aluminum wire with a green stripe D) Uninsulated aluminum wire Answer: D Explanation: Uninsulated aluminum is not permitted as a bonding jumper; it must be copper or aluminum with proper insulation. Question 35. The NEC definition of “continuous load” requires the load to be rated at: A) 80 % of the circuit rating B) 100 % of the circuit rating C) 125 % of the circuit rating D) 150 % of the circuit rating Answer: C Explanation: Continuous loads must be sized at 125 % of the actual load to prevent overheating. Question 36. A 3-wire NM cable is installed in a residential kitchen. Which conductor is required to be grounded? A) Only the black conductor B) Only the white conductor C) Only the bare copper conductor D) Both the black and white conductors Answer: C Explanation: NM cable includes a bare copper equipment grounding conductor that must be connected to the grounding system. Question 37. The maximum number of receptacles allowed on a single 15-A branch circuit in a dwelling unit is: A) 8 B) 10 C) 12 D) No specific limit, but must not exceed the circuit’s ampacity
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A) Must be reachable with a ladder B) Must be reachable without removing any part of the building structure C) Must be reachable without tools D) Must be reachable without removing a cover or panel Answer: D Explanation: “Accessible” means capable of being reached without removing any part of the building, enclosure, or equipment. Question 43. A motor rated at 7 HP, 240 V, 3-phase requires a protective device rated at: A) 20 A B) 30 A C) 40 A D) 50 A Answer: B Explanation: Using NEC Table 430.250, a 7 HP 3-phase motor requires a 30 A overload protection device. Question 44. Which wiring method is prohibited for use in a damp or wet location? A) NM cable B) UF cable C) MC cable with a metal sheath D) AC cable with a flexible metal conduit Answer: A Explanation: NM (Romex) is not permitted in damp or wet locations; UF or MC must be used. Question 45. The required conductor size for a 100-ft run of 120-V, 20-A circuit, allowing a maximum voltage drop of 3 %, is: A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: C Explanation: Using the voltage-drop formula, #10 AWG copper limits the drop to ≤ 3 % over 100 ft at 20 A. Question 46. When installing a receptacle in a bathroom, which of the following is required? A) GFCI protection only B) AFCI protection only C) Both GFCI and AFCI D) No special protection required Answer: A
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Explanation: NEC 210.8(A)(1) mandates GFCI protection for bathroom receptacles; AFCI is not required. Question 47. A conduit system that is installed outdoors and exposed to the elements must be: A) EMT only B) RMC or PVC only C) Any metal conduit D) Rigid conduit, intermediate-metal conduit, or PVC conduit Answer: D Explanation: Outdoor exposed conduit must be suitable for wet locations; RMC, IMC, or PVC are acceptable. Question 48. The NEC requires that a disconnect for a multi-motor installation be capable of: A) Simultaneously disconnecting all motors B) Disconnecting only one motor at a time C) Disconnecting the feeder only D) No specific requirement Answer: A Explanation: NEC 430.102 requires a disconnecting means that can simultaneously disconnect all motors on the circuit. Question 49. Which of the following is the correct ampacity for a 3-conductor, 75 °C rated, 4/0 AWG aluminum conductor? A) 150 A B) 180 A C) 205 A D) 230 A Answer: D Explanation: NEC Table 310.15(B)(16) lists 4/0 AWG aluminum at 230 A for 75 °C. Question 50. The minimum spacing between a conduit strap and a wall opening for a raceway that runs through the opening is: A) 1 in. B) 2 in. C) 4 in. D) No spacing required if the conduit is secured Answer: B Explanation: NEC 300.11 requires a minimum of 2 in. clearance from the edge of an opening to the nearest strap. Question 51. Which of the following devices is required on a 120-V, 15-A bathroom receptacle that is within 6 ft of a bathtub?
Journeyman Electrician Ultimate
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Question 56. Which of the following is NOT a permissible method for protecting a conduit run that passes through a fire-rated wall? A) Firestop sealant B) Fire-rated conduit sleeves C) Leaving the conduit exposed D) Using a listed fire-stop system Answer: C Explanation: Leaving the conduit exposed through a fire-rated assembly violates fire-resistance requirements. Question 57. The NEC requires that a receptacle installed in a kitchen countertop area be GFCI protected and have a minimum rating of: A) 15 A B) 20 A C) 30 A D) 40 A Answer: B Explanation: Kitchen countertop receptacles must be 20-A rated and GFCI protected. Question 58. In a Class I, Division 2 hazardous location, which type of wiring method is permitted? A) NM cable B) MC cable with a metal sheath C) PVC conduit with THHN conductors D) Rigid metal conduit only Answer: C Explanation: PVC conduit with THHN conductors is acceptable for Class I, Division 2 hazardous locations. Question 59. The minimum clearance required between a service disconnect and a door opening in a residential dwelling is: A) 0 ft (must be adjacent) B) 3 ft C) 6 ft D) No specific clearance required as long as it is readily accessible Answer: D Explanation: NEC requires the disconnect to be readily accessible; no fixed clearance distance from a door is mandated. Question 60. Which of the following is the correct conduit fill calculation for three 4-AWG THHN conductors in a 1-in. EMT?
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A) 20 % B) 30 % C) 40 % D) 50 %
Answer: B Explanation: The total cross-sectional area of three 4-AWG THHN conductors is about 0.35 in²; 1-in. EMT has a 0.304 in² 30 % fill limit, so the fill is just under 30 %. Question 61. A receptacle installed in a garage that is used for a vehicle charger must be protected by: A) GFCI only B) AFCI only C) Both GFCI and AFCI D) No special protection required Answer: A Explanation: NEC 210.8(A)(2) requires GFCI protection for garage receptacles, including EV charger outlets. Question 62. The required size of a grounding electrode conductor for a 200 - A service using aluminum conductors is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: Table 250.66 lists #4 AWG aluminum for a 200-A service. Question 63. Which of the following is the correct definition of “continuous load” according to NEC? A) Any load that operates for more than one hour per day B) Any load that operates for three hours or more continuously C) Any load that operates intermittently throughout the day D) Any load that exceeds 80 % of a circuit’s rating Answer: B Explanation: A continuous load is defined as a load expected to run for three hours or more without interruption. Question 64. The maximum number of conductors allowed in a 1/2-in. PVC conduit for a single-phase 120/240-V feeder is: A) 2 B) 3 C) 4 D) 5 Answer: C
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Question 69. The minimum height for mounting a receptacle outlet in a residential hallway is: A) 12 in. above the floor B) 15 in. above the floor C) 18 in. above the floor D) No specific height requirement Answer: D Explanation: NEC does not specify a mounting height for hallway receptacles; they must be installed at a convenient location. Question 70. When using MC cable in a wet location, the cable must be: A) Listed for use in wet locations B) Covered with a waterproof conduit C) Only used indoors D) Replaced with UF cable Answer: A Explanation: MC cable must be listed for wet locations if installed outdoors or in damp environments. Question 71. The NEC allows the use of a single-pole breaker as a disconnect for a single-motor circuit only if the motor is: A) Less than 5 HP B) Rated 250 V or less C) Not more than 30 A D) All of the above Answer: D Explanation: Single-pole breakers may be used as disconnects for motors meeting all listed criteria. Question 72. Which of the following is the correct method for grounding a separate-derived system (e.g., a transformer)? A) Connect the neutral to the grounding electrode system only at the source B) Bond the neutral and grounding conductors at the transformer and at the service panel C) Do not bond neutral to ground at any point D) Bond only at the load side Answer: B Explanation: NEC 250.30 requires bonding of neutral and ground at the separately derived system’s source (transformer) and at the service equipment. Question 73. The required minimum size of a grounding electrode conductor for a 500-A service using copper is:
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A) #4 AWG B) #2 AWG C) #1/0 AWG D) #2/0 AWG
Answer: D Explanation: Table 250.66 lists #2/0 AWG copper for a 500-A service. Question 74. In a Class II, Division 1 hazardous location, which of the following wiring methods is permitted? A) NM cable B) MC cable with a metal sheath C) Rigid metal conduit only D) PVC conduit with THHN conductors Answer: D Explanation: PVC conduit with THHN conductors is acceptable for Class II, Division 1 areas. Question 75. The NEC requires that a receptacle installed in a wet location (e.g., outdoors) be protected by a: A) GFCI only B) AFCI only C) Both GFCI and AFCI D) No special protection required Answer: A Explanation: Outdoor receptacles must be GFCI protected per NEC 210.8(A)(3). Question 76. Which of the following is the correct ampacity for a 2-conductor, 75 °C rated, 3/0 AWG aluminum conductor? A) 150 A B) 165 A C) 200 A D) 225 A Answer: D Explanation: NEC Table 310.15(B)(16) lists 3/0 AWG aluminum at 225 A for 75 °C. Question 77. The minimum distance between a conduit strap and a ceiling joist for a horizontal run is: A) 4 in. B) 6 in. C) 8 in. D) No minimum distance required Answer: A Explanation: NEC 300.11 requires a minimum of 4 in. clearance from the nearest edge of a framing member when securing conduit.
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conduit’s inherent grounding properties without additional bonding D) Installing a grounding strap at the termination point Answer: C Explanation: Outdoor metal conduit must be bonded with a grounding electrode conductor; relying solely on inherent conductivity is not acceptable. Question 83. The NEC requires that a receptacle installed in a commercial kitchen be GFCI protected if it is located within: A) 6 ft of a sink B) 3 ft of a cooking surface C) 2 ft of a dishwasher D) Any location in the kitchen Answer: A Explanation: NEC 210.8(A)(6) requires GFCI protection for receptacles within 6 ft of a sink in a commercial kitchen. Question 84. The minimum conduit size for a single 3/0 AWG THHN conductor is: A) 1/2 in. EMT B) 3/4 in. EMT C) 1 in. EMT D) 1-1/4 in. EMT Answer: B Explanation: NEC Chapter 9 Table 1 indicates that 3/0 AWG THHN requires a minimum of 3/4-in. EMT for proper fill. Question 85. In a residential dwelling, the maximum number of receptacles allowed on a single 20-A branch circuit serving countertop areas is: A) 6 B) 8 C) 10 D) No specific limit, as long as load does not exceed 80 % of the circuit rating Answer: D Explanation: NEC does not set a fixed number; the total load must not exceed 80 % of the circuit’s rating for continuous loads. Question 86. Which of the following is the correct NEC requirement for a grounding electrode system for a detached garage? A) One ground rod only B) Two ground rods spaced 6 ft apart C) A ground rod and a metal water pipe D) No grounding electrode required if the garage is supplied by a feeder with an equipment grounding conductor Answer: D
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Explanation: If a feeder with an equipment grounding conductor supplies the detached garage, a separate grounding electrode system is not required. Question 87. The required ampacity for a feeder supplying a 10 kW, 240-V commercial load is: A) 30 A B) 40 A C) 45 A D) 50 A Answer: C Explanation: Load current = 10 kW / 240 V = 41.7 A; applying 125 % for continuous load yields 52 A, rounded up to the next standard size, 55 A. (Correction: The nearest standard size >52 A is 55 A, thus answer D). Question 88. Which type of conduit is prohibited for use in a wet location when it is installed underground? A) EMT B) PVC C) RMC D) IMC Answer: A Explanation: EMT is not permitted in wet locations such as underground installations. Question 89. The NEC requires that a circuit supplying a bathroom vanity light be protected by: A) GFCI only B) AFCI only C) Both GFCI and AFCI D) No special protection required Answer: A Explanation: NEC 210.8(A)(1) mandates GFCI protection for bathroom receptacles and lighting circuits. Question 90. The maximum allowable voltage drop for a feeder that supplies a critical load (e.g., hospital equipment) is: A) 1 % B) 2 % C) 3 % D) 5 % Answer: B Explanation: NEC recommends a maximum of 2 % voltage drop for feeders feeding critical loads.
