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Journeyman Electrician Part I Part II
Learning Course Ultimate Exam
Question 1. Which NEC article defines the term “grounding electrode system”? A) Article 250 B) Article 250- 50 C) Article 250- 100 D) Article 250- 150 Answer: C Explanation: Article 250-100 provides the definitions for grounding electrode system, grounding electrode conductor, and related terms. Question 2. Under Massachusetts amendment 527 CMR 12.00-4.1, the service disconnecting means must be located within how many feet of the point of entrance? A) 3 ft B) 5 ft C) 6 ft D) 8 ft Answer: B Explanation: The state amendment requires the service disconnect to be installed within 5 feet of the service entrance point. Question 3. What is the minimum size copper equipment grounding conductor required for a 100-ampere, 2-wire branch circuit using 12 AWG conductors? A) 14 AWG B) 12 AWG C) 10 AWG
Journeyman Electrician Part I Part II
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D) 8 AWG
Answer: A Explanation: Table 250.122 specifies a 14 AWG copper EGC for a 100 A circuit. Question 4. Which of the following is NOT a permissible method for grounding a metal water pipe that is part of the grounding electrode system? A) Directly bonding with a #6 copper conductor B) Using a listed grounding clamp at the pipe C) Wrapping the pipe with bare copper wire and securing with a zip tie D) Installing a grounding electrode conductor to the pipe at the point of entry Answer: C Explanation: Bare copper wire with a zip tie is not an acceptable means of bonding; a listed clamp or listed bonding jumper must be used. Question 5. In NEC Chapter 3, which article governs overcurrent protection for feeders? A) Article 210 B) Article 240 C) Article 310 D) Article 430 Answer: B Explanation: Article 240 provides the requirements for overcurrent protection of feeders, branch circuits, and other conductors. Question 6. A 30-ampere, single-phase, 120/240 V service requires a main breaker. What is the minimum ampere rating of the breaker per NEC 230 - 102?
Journeyman Electrician Part I Part II
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Explanation: The amendment mandates a 12-inch minimum clearance for conduit in commercial garage environments. Question 9. What is the maximum number of 14-AWG insulated conductors permitted in a ½-in. EMT conduit according to NEC Table 1, Chapter 9? A) 6 B) 9 C) 12 D) 15 Answer: B Explanation: Table 1 provides conduit fill limits; a ½-in. EMT can hold up to nine 14-AWG conductors. Question 10. Which of the following devices must be GFCI-protected in a dwelling unit according to NEC 210-210? A) A 20-amp receptacle in a kitchen countertop B) A 15-amp receptacle in a living room C) A 30-amp dryer receptacle in a utility room D) A 15-amp receptacle in a bedroom Answer: A Explanation: All 15- and 20-amp receptacles serving countertop surfaces in kitchens must be GFCI-protected. Question 11. For a three-phase, 4-wire, 480 V motor, the NEC requires a disconnecting means to be located within how many feet of the motor? A) 10 ft
Journeyman Electrician Part I Part II
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B) 25 ft C) 50 ft D) 75 ft Answer: B Explanation: Article 430-102 requires the disconnect to be within 25 ft of the motor location. Question 12. When sizing a motor branch-circuit conductor, which factor is applied to the motor’s full-load current (FLC) according to NEC 430-22? A) 125 % for continuous duty B) 100 % for non-continuous duty C) 115 % for non-continuous duty D) 150 % for short-run circuits Answer: C Explanation: NEC 430-22 requires branch-circuit conductors to be sized at 115 % of the motor’s FLC for non-continuous duty. Question 13. A residential feeder supplying a 120/240-V service has a calculated load of 55 kVA. Using the 125 % demand factor for the first 10 kVA, what is the minimum feeder ampacity? A) 200 A B) 225 A C) 250 A D) 275 A Answer: B Explanation: First 10 kVA ×125 % =12.5 kVA; remaining 45 kVA ×100 % =45 kVA; total =57.5 kVA. At 240 V, I =57,500/240 ≈240 A. The next standard
Journeyman Electrician Part I Part II
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A) 8
B) 10
C) 12
D) No specific limit, but must not be overloaded Answer: D Explanation: NEC does not set a numeric limit; the circuit must be sized to handle the anticipated load per 210-210 and 220-210. Question 17. For a Class 2 low-voltage lighting system operating at 24 V, the maximum allowed circuit voltage per NEC is: A) 30 V B) 50 V C) 60 V D) 75 V Answer: C Explanation: Class 2 circuits are permitted up to 60 V nominal (NEC 725-2). Question 18. Which of the following is the correct method for calculating box fill for a device box containing one duplex receptacle? A) Count each conductor as one volume unit, plus one for the device B) Count each conductor and the equipment grounding conductor, plus two for the device C) Count each conductor, each internal clamp, and add one for the device D) Count each conductor, each internal clamp, each equipment grounding conductor, and add two for the device Answer: D
Journeyman Electrician Part I Part II
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Explanation: Per NEC 314-16, each conductor that terminates in the box, each internal clamp, each equipment grounding conductor, and two conductors for the device count toward box fill. Question 19. A 120-V, 20-A circuit supplies a fluorescent lighting fixture with a ballast rated at 0.5 kW. What is the minimum ampacity of the branch-circuit conductor? A) 12 AWG copper B) 14 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: A Explanation: 0.5 kW /120 V =4.2 A; the circuit load is well below 20 A, so 12 AWG (20 A) is sufficient per Table 310-16. Question 20. Under Massachusetts law, an apprentice may not work on which of the following without direct supervision of a journeyman? A) Installing receptacles in a residential kitchen B) Wiring a 240-V dryer circuit C) Performing a service-entrance disconnect replacement D) All of the above Answer: D Explanation: M.G.L. Chapter 141 requires apprentices to be supervised by a journeyman on all electrical work, including residential receptacle installs, dryer circuits, and service-entrance work. Question 21. Which NEC article requires that conduit in a wet location be listed for wet locations?
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Explanation: Article 250-30 covers grounding of transformers and the requirements for the grounded conductor. Question 24. Which of the following is the correct conduit fill percentage for more than two conductors in a raceway? A) 40 % B) 45 % C) 50 % D) 60 % Answer: C Explanation: NEC Chapter 9 Table 1 permits a maximum of 40 % fill for one conductor, 31 % for two, and 40 % for three or more; however, for raceways the limit is 40 % for more than two conductors. (Correction: The correct answer is 40 % – option A.) Explanation correction: The permitted fill for three or more conductors is 40 % of the conduit’s internal cross-sectional area. Question 25. An equipment grounding conductor must be installed in a raceway with a feeder. Which NEC table provides the minimum size based on the feeder overcurrent device rating? A) Table 250- 122 B) Table 310- 16 C) Table 220- 4 D) Table 240- 4 Answer: A Explanation: Table 250-122 lists the minimum size of equipment grounding conductors relative to the overcurrent protection rating.
Journeyman Electrician Part I Part II
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Question 26. A 3-phase, 4-wire, 208/120 V motor requires a disconnecting means. According to NEC 430-102, the disconnect must be rated at least at what percentage of the motor’s full-load current? A) 100 % B) 115 % C) 125 % D) 150 % Answer: C Explanation: NEC 430-102 requires the disconnect to be rated at not less than 125 % of the motor’s FLC. Question 27. In a residential installation, which type of receptacle must be installed at a height not exceeding 48 inches above the floor? A) GFCI receptacle in a bathroom B) Standard receptacle in a garage C) 20-amp receptacle in a kitchen countertop D) 15-amp receptacle in a bedroom Answer: A Explanation: NEC 210-411 requires GFCI receptacles in bathrooms to be installed at a maximum height of 48 inches above the finished floor. Question 28. Which NEC article specifically addresses the requirements for flexible metal conduit (FMC)? A) Article 352 B) Article 358 C) Article 376 D) Article 380
Journeyman Electrician Part I Part II
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A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B Explanation: 2 kW/120 V = 16.7 A; the 20-A breaker requires at least 12 AWG copper per Table 310 - 16. Question 32. Under Massachusetts amendment 527 CMR 12.00-6.1, the minimum height for a receptacle in a dwelling unit bathroom 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: The state amendment does not impose a specific height; it follows the NEC which only requires location within reach. Question 33. Which of the following is a permissible grounding electrode for a residential building? A) A metal water pipe not in direct contact with earth B) A concrete-encased electrode (Ufer) C) A 4-AWG copper conductor buried 6 in deep D) A plastic pipe used for drainage Answer: B
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Explanation: A concrete-encased electrode is a recognized grounding electrode per NEC 250-52(A)(3). Question 34. A motor requires a short-circuit and ground-fault protective device (SCGFD). Which NEC article provides the criteria for selecting the SCGFD? A) Article 430- 101 B) Article 430- 102 C) Article 430- 203 D) Article 430- 210 Answer: C Explanation: Article 430-203 addresses the selection of short-circuit and ground-fault protective devices for motors. Question 35. When calculating voltage drop, which factor must be considered for conductors operating at temperatures above 30 °C? A) Temperature correction factor from Table 310-15(B) B) Conductor resistance from Table 310- 16 C) Load factor from Article 220- 42 D) Derating factor from Table 310-15(A) Answer: A Explanation: Table 310-15(B) provides temperature correction factors for conductor resistance when operating above 30 °C. Question 36. Which NEC article governs the installation of receptacles in a swimming pool deck area? A) Article 680- 11
Journeyman Electrician Part I Part II
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Question 39. The NEC permits the use of a listed “metallic raceway” as a grounding electrode conductor. Which article allows this? A) Article 250- 118 B) Article 250- 122 C) Article 250- 130 D) Article 250- 150 Answer: A Explanation: Article 250-118 allows the use of a metal raceway as a grounding electrode conductor if it is listed for that purpose. Question 40. In a residential dwelling, the total calculated load for general lighting is 3 kVA. Using the standard method, what is the demand factor applied to this portion of the load? A) 100 % B) 90 % C) 80 % D) 70 % Answer: B Explanation: NEC 220-42 requires a 90 % demand factor for general lighting loads up to 3 kVA. Question 41. Which of the following is the correct minimum burial depth for non-metallic sheathed cable (NM-B) installed in a residential driveway trench? A) 6 in B) 12 in
Journeyman Electrician Part I Part II
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C) 18 in D) 24 in Answer: B Explanation: NEC 334-31 requires NM-B cable to be buried at least 12 inches deep when installed in a driveway. Question 42. Under Massachusetts amendment 527 CMR 12.00-8.3, the required fire-resistance rating for a service equipment enclosure in a high-rise building is: A) 1-hour B) 2-hour C) 3-hour D) No specific rating required Answer: B Explanation: The amendment specifies a minimum 2-hour fire-resistance rating for service equipment in high-rise structures. Question 43. When installing a conduit system that passes through a fire-rated wall, which NEC article governs the required fire-stop rating? A) Article 300- 6 B) Article 300- 11 C) Article 300- 20 D) Article 300- 22 Answer: B Explanation: Article 300-11 addresses fire protection of penetrations through fire-rated assemblies.
Journeyman Electrician Part I Part II
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D) 0.849 in² Answer: B Explanation: Cross-sectional area = π × (0.824/2)² ≈0.533 in². Applying the 40 % fill limit for three or more conductors yields ≈0.213 in², but the question asks for total area, so 0.533 in² (option A). Explanation correction: The correct total internal area is approximately 0.533 in² (option A). Question 47. Which NEC article dictates the minimum ampacity of a feeder supplying a single-family dwelling’s electric range? A) Article 210- 23 B) Article 220- 42 C) Article 210- 30 D) Article 220- 55 Answer: D Explanation: Article 220-55 provides the calculation method for electric ranges, ovens, and cooking appliances. Question 48. A 240-V, 30-amp dryer circuit must have a neutral conductor. According to NEC, what is the minimum size of the neutral? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B
Journeyman Electrician Part I Part II
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Explanation: NEC 210-4 requires the neutral to be sized at least as large as the ungrounded conductors; for a 30-A circuit, 12 AWG copper is the minimum. Question 49. Which NEC article addresses the installation of conduit bodies (C-boxes)? A) Article 314- 30 B) Article 314- 40 C) Article 314-30A D) Article 314-30B Answer: A Explanation: Article 314-30 covers the requirements for conduit bodies, including cover types and installation. Question 50. In a commercial garage, the NEC requires that all receptacles serving electric vehicle charging stations be protected by a listed arc-fault circuit interrupter (AFCI). Which amendment to the NEC provides this requirement? A) 2020 NEC 210- 50 B) 2023 NEC 210- 50 C) 2020 NEC 210- 84 D) 2023 NEC 210- 84 Answer: B Explanation: The 2023 NEC added AFCI protection for EV charging station receptacles in commercial garages under 210-84.
