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Journeyman Electrician
Ultimate Exam
Question 1. Which formula correctly represents Ohm’s Law? A) P = V × I 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). Question 2. In NEC terminology, what does “accessible” mean? A) Capable of being removed without tools B) Capable of being reached without damaging the building structure C) Capable of being seen with a flashlight D) Capable of being reached without the use of a ladder Answer: B Explanation: “Accessible” means that a component can be reached for operation, inspection, or maintenance without removing any part of the building structure or finish. Question 3. What is the power consumed by a 120 V load drawing 10 A? A) 1.2 kW B) 12 kW C) 120 W D) 1.2 W Answer: A Explanation: Power P = V × I = 120 V × 10 A = 1,200 W = 1.2 kW. Question 4. Which PPE is required when working on a live panel with voltage above 600 V?
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Ultimate Exam
A) Safety glasses only B) Insulated gloves rated for the voltage C) Ear protection D) Hard hat only Answer: B Explanation: Insulated gloves rated for the system voltage protect against electric shock on high-voltage work. Question 5. What is the minimum burial depth for a 4 AWG copper feeder in PVC conduit under a residential driveway? A) 12 inches B) 18 inches C) 24 inches D) 30 inches Answer: C Explanation: NEC 300.5 requires a minimum of 24 inches for feeders in PVC conduit under a driveway. Question 6. Which conduit type is permitted for outdoor installations in wet locations? A) EMT B) Rigid metal conduit (RMC) C) PVC (Schedule 40) D) Flexible metal conduit (FMC) Answer: C Explanation: PVC conduit is listed for wet locations, whereas EMT and FMC are not permitted outdoors where they are exposed to moisture.
Journeyman Electrician
Ultimate Exam
Question 10. Which insulation type is rated for both wet and dry locations and can be used at temperatures up to 90 °C? A) THHN B) THWN- 2 C) XHHW- 2 D) UF-B Answer: C Explanation: XHHW-2 insulation is rated for wet and dry locations and 90 °C temperature rating. Question 11. What is the minimum conduit size required for a 3-wire 60 A feeder using 4 AWG copper conductors? A) ½-in. EMT B) ¾-in. EMT C) 1-in. EMT D) 1¼-in. EMT Answer: B Explanation: Using Table 4, Chapter 9, a ¾-in. EMT can accommodate three 4 AWG conductors with required fill. Question 12. For a commercial building, how often must a receptacle be installed in a wall space that is 12 ft wide? A) Every 6 ft B) Every 8 ft C) Every 12 ft D) Every 24 ft Answer: A
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Explanation: NEC 210.52(A)(1) requires receptacles at intervals not exceeding 6 ft measured from the floor up. Question 13. Which of the following locations requires GFCI protection for a 20 A, 120 V branch circuit? A) A garage workshop B) A living-room entertainment area C) A hallway with no water sources D) A bedroom closet Answer: A Explanation: GFCI protection is mandatory in garages, as per NEC 210.8(A)(2). Question 14. What is the allowable voltage drop for a branch circuit serving a single receptacle, according to best practice? A) 1 % B) 2 % C) 3 % D) 5 % Answer: B Explanation: The NEC recommends a maximum of 2 % voltage drop for branch circuits to maintain efficient operation. Question 15. Which device provides arc-fault protection for a 120 V bedroom circuit? A) GFCI receptacle B) Standard circuit breaker C) AFCI breaker D) Surge protector Answer: C
Journeyman Electrician
Ultimate Exam
Explanation: Metal water pipe in contact with earth for minimum 10 ft qualifies as a grounding electrode per NEC 250.52(A)(1). Question 19. What size of equipment grounding conductor (EGC) is required for a 30 A circuit using copper conductors? A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: B Explanation: Table 250.122 indicates a 30 A circuit requires a 12 AWG copper EGC. Question 20. When is a bonding jumper required between a metal water pipe and the grounding electrode system? A) Only if the pipe is insulated B) Only if the pipe is non-metallic C) Whenever the pipe is used as a grounding electrode D) Never, because water pipes are not part of the grounding system Answer: C Explanation: NEC 250.104(A) requires a bonding jumper when a metal water pipe is used as a grounding electrode. Question 21. Which class of hazardous location is defined for areas with combustible dust? A) Class I B) Class II C) Class III D) Class IV Answer: B
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Explanation: Class II locations are those where combustible dust may be present. Question 22. What is the required bonding conductor size for a swimming pool’s metal reinforcing steel (rebar) when the pool is 30 ft in diameter? A) 8 AWG copper B) 6 AWG copper C) 4 AWG copper D) 2 AWG copper Answer: B Explanation: NEC 680.26(A)(2) requires a #6 copper bonding jumper for pools 30 ft or larger. Question 23. In a health-care facility, which wiring method is required for patient care areas? A) NM-B cable B) MC cable with metal armor only C) Rigid metal conduit (RMC) or EMT with proper grounding D) PVC conduit only Answer: C Explanation: NEC 517.2 requires metal raceways (RMC or EMT) for patient care areas to provide additional protection. Question 24. Which of the following devices is used to provide standby power to emergency lighting? A) Transfer switch B) Uninterruptible power supply (UPS) C) Generator interlock kit D) Battery backup system Answer: D
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Explanation: Table 250.122 specifies a #12 copper grounding electrode conductor for a 10 kVA generator. Question 28. Which NEC article defines the requirements for service-entrance conductors? A) Article 210 B) Article 310 C) Article 250 D) Article 230 Answer: D Explanation: Article 230 deals with service-entrance conductors and related equipment. Question 29. What is the minimum clearance between a service drop and a building opening (door, window, etc.)? A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: C Explanation: NEC 230.41 requires a minimum of 8 ft clearance between a service drop and any building opening. Question 30. When installing a meter socket, what is the required distance from the ground to the bottom of the socket? A) 12 inches B) 24 inches C) 36 inches D) 48 inches
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Answer: B Explanation: NEC 230.24(A) mandates a minimum of 24 inches from the ground to the bottom of the meter socket. Question 31. Which grounding electrode is considered a “Ufer” ground? A) A ground rod driven 8 ft into the earth B) A concrete-encased electrode C) A metal water pipe in direct contact with earth D) A ground plate buried 2 ft below the surface Answer: B Explanation: A “Ufer” ground refers to a concrete-encased electrode, typically a rebar or copper conductor embedded in the foundation. Question 32. What is the required size of a bonding jumper between a metal conduit system and the grounding electrode system for a 100 A service? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: C Explanation: Table 250.102(C) requires #10 copper for bonding jumpers on a 100 A service. Question 33. Which of the following is NOT a permitted location for a receptacle in a kitchen countertop area? A) 12 inches from the edge of the countertop B) Directly above a stove C) Within 2 ft of a sink D) Anywhere on a wall above the countertop
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D) 6
Answer: B Explanation: Using Table C.2, a 3/4-in. PVC can accommodate up to 4 conductors of 4 AWG aluminum at 40 % fill. Question 37. Which of the following is the correct method for marking a 3-phase, 4 - wire feeder in a commercial building? A) Red, black, white, green B) L1-black, L2-red, L3-blue, N-white, G-green C) L1-black, L2-red, L3-blue, N-white, G-green D) Black, red, blue, yellow Answer: C Explanation: NEC recommends color coding: L1-black, L2-red, L3-blue, neutral-white, grounding-green for a 3-phase, 4-wire system. Question 38. For a feeder supplying a 100 A subpanel, what is the minimum size of the equipment grounding conductor? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B Explanation: Table 250.122 requires a #12 copper EGC for a 100 A over-current device. Question 39. Which NEC article governs the installation of luminaires in wet locations? A) Article 210 B) Article 410
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C) Article 410 D) Article 410 (Note: there is only one correct article) Answer: B Explanation: Article 410 covers luminaires, lampholders, and related equipment, including requirements for wet locations. Question 40. A 240 V, 50 A dryer circuit uses a 10-AWG copper conductor. Is this conductor size appropriate? A) Yes, because 10-AWG copper is rated for 30 A only B) No, because 10-AWG copper is undersized for 50 A C) Yes, because 10-AWG copper is rated for 55 A in 75 °C insulation D) No, because dryer circuits require 8-AWG copper Answer: C Explanation: 10-AWG copper with 75 °C insulation is rated for 55 A, thus acceptable for a 50 A dryer circuit. Question 41. What type of transformer is required for a commercial building that supplies a 480 V three-phase service? A) Dry-type, 3-phase transformer B) Oil-filled, single-phase transformer C) Dry-type, single-phase transformer D) Oil-filled, 3-phase transformer Answer: A Explanation: For 480 V three-phase service, a dry-type 3-phase transformer is typically used in commercial installations. Question 42. Which device must be installed on a 120 V, 20 A circuit that supplies a bathroom vanity light? A) GFCI receptacle
Journeyman Electrician
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Question 45. Which of the following is a permitted method for bonding a metal conduit to the grounding electrode system? A) Using a copper bonding jumper of any size B) Using a listed bonding strap sized per Table 250.102(C) C) Using the conduit itself as the grounding electrode D) No bonding is required if the conduit is continuous Answer: B Explanation: NEC requires a listed bonding strap sized according to Table 250.102(C) to bond metal raceways to the grounding electrode system. Question 46. A 30 A, 240 V water heater requires which of the following conduit fill for three 10 AWG copper conductors? A) 40 % fill, 1/2-in. EMT B) 40 % fill, 3/4-in. EMT C) 31 % fill, 1/2-in. EMT D) 31 % fill, 3/4-in. EMT Answer: D Explanation: Using Table C.2, three 10 AWG copper conductors require a 3/4-in. EMT to stay within the 31 % fill limit for three conductors. Question 47. Which NEC article addresses the requirements for emergency systems? A) Article 700 B) Article 710 C) Article 720 D) Article 730 Answer: A
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Explanation: Article 700 covers emergency systems, including power sources, wiring methods, and equipment. Question 48. What is the required spacing between supports for a horizontal run of 1-in. PVC conduit supporting a 250 A feeder? A) 3 ft B) 4 ft C) 6 ft D) 8 ft Answer: C Explanation: NEC 352.30 requires PVC conduit to be supported at intervals not exceeding 6 ft for conductors larger than 1/0 AWG. Question 49. In a Class I, Division 2 hazardous location, which type of conduit is permissible? A) Rigid metal conduit (RMC) with a corrosion-resistant coating B) PVC conduit C) Flexible metal conduit (FMC) D) EMT with a special coating Answer: A Explanation: RMC is approved for use in Class I, Division 2 hazardous locations per NEC 500.10. Question 50. Which of the following is the correct method for grounding a metal-clad switchgear panel? A) Connect the neutral bar directly to the grounding electrode B) Bond the panel’s grounding bus to the equipment grounding conductor and grounding electrode C) Use only the equipment grounding conductor without bonding to the panel D) No grounding is required for switchgear
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D) The building owner Answer: B Explanation: A qualified person is defined as one who has the skills and knowledge to perform the work safely, not necessarily a licensed electrician. Question 54. A 20 A, 120 V receptacle is installed in a garage. What is the required distance from the nearest edge of the receptacle to the floor? A) 12 inches B) 15 inches C) 18 inches D) 24 inches Answer: A Explanation: NEC 210.52(A)(3) requires receptacles in garages to be installed not less than 12 inches above the floor. Question 55. Which of the following devices must be installed on a 120/240 V, 30 A branch circuit feeding a residential electric range? A) GFCI breaker B) AFCI breaker C) Standard 30 A double-pole breaker D) Two 15 A single-pole breakers Answer: C Explanation: Residential ranges require a standard 30 A double-pole breaker; GFCI/AFCI is not required for this application. Question 56. What is the maximum distance between supports for a 1-in. EMT conduit that carries a 100 A feeder? A) 3 ft B) 4 ft
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C) 6 ft D) 8 ft Answer: C Explanation: NEC 358.30 requires EMT to be supported at intervals not exceeding 6 ft. Question 57. Which of the following is the correct method for calculating conduit fill for a raceway containing both insulated and uninsulated conductors? A) Count each conductor once, regardless of insulation B) Count insulated conductors at 1.5 times their actual area C) Use the larger of the two fill tables (Table C.1 or C.2) D) Apply the 40 % fill rule for all conductors Answer: C Explanation: NEC requires using the appropriate table (C.1 for insulated, C.2 for uninsulated) and then applying the 40 % fill limit for more than two conductors. Question 58. A 120 V, 20 A circuit supplies a bathroom exhaust fan. Which protection is required? A) GFCI protection only B) AFCI protection only C) Both GFCI and AFCI protection D) No special protection required Answer: A Explanation: NEC 210.8(A)(6) mandates GFCI protection for bathroom receptacles and fan circuits. Question 59. Which of the following grounding electrode systems is prohibited for a new residential construction? A) Ground rod
