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Question 1. Which Maine Board definition requires a minimum of 8,000 hours of combined apprenticeship and work experience? A) Journeyman Electrician B) Master Electrician C) Limited Electrician D) Apprentice Electrician Answer: B Explanation: Maine law defines a Master Electrician as having at least 8,000 hours of experience, including apprenticeship and work time. Question 2. Under Maine statutes, a licensed electrician must report a change of address within how many days? A) 5 days B) 10 days C) 15 days D) 30 days Answer: B Explanation: The Electricians’ Examining Board requires reporting any address change within 10 days of the change. Question 3. Which entity issues electrical permits for residential work in most Maine municipalities? A) State Board of Electrical Examiners B) Local Building Department C) Federal Energy Regulatory Commission F) Utility Company Answer: B Explanation: Municipal building departments typically issue permits for residential electrical work.
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Question 4. What is considered “unprofessional conduct” that can lead to license suspension in Maine? A) Failing to wear safety glasses on a job site B) Performing work without a valid permit C) Using a digital multimeter for testing D) Ordering supplies online Answer: B Explanation: Performing electrical work without the required permit is classified as unprofessional conduct. Question 5. Ohm’s Law is expressed as V = I × R. If a circuit has 120 V and a resistance of 30 Ω, what is the current? A) 2 A B) 4 A C) 6 A D) 8 A Answer: B Explanation: I = V / R = 120 V / 30 Ω = 4 A. Question 6. A 1500 W electric heater operates on a 240-V circuit. What is its current draw? A) 5 A B) 6.25 A C) 12.5 A D) 15 A Answer: B Explanation: I = P / V = 1500 W / 240 V = 6.25 A. Question 7. According to NEC Article 220, the demand factor for a dwelling’s general lighting and receptacle loads is:
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A) 0.6 %
B) 1.0 %
C) 2.0 %
D) 3.0 %
Answer: C Explanation: Using the voltage-drop formula, 12-AWG copper has ~1.93 Ω per 1000 ft; 100 ft at 20 A yields about 0.386 V on a 120-V circuit (~0.32 %). Rounding to the nearest answer gives 2 %. Question 11. In NEC, the grounded (neutral) conductor must be identified by: A) White or gray insulation B) Green insulation C) Bare or green insulation D) Red insulation Answer: A Explanation: NEC 200.6 requires the neutral to be identified by white or gray insulation. Question 12. Which of the following is NOT permitted as a branch-circuit grounding conductor? A) Bare copper wire B) Green insulated wire C) White insulated wire D) Unspliced copper braid in a metal conduit Answer: C Explanation: White or gray insulation identifies a neutral, not a grounding conductor. Question 13. The maximum length of a flexible cord for a 20 A branch circuit supplying a portable lamp is: A) 25 ft
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B) 50 ft C) 75 ft D) No specific limit, as long as voltage drop is acceptable Answer: D Explanation: NEC does not set a fixed length limit for flexible cords; the installer must ensure voltage drop and ampacity are within limits. Question 14. Which article of the NEC governs overcurrent protection for transformers? A) 240 B) 310 C) 450 D) 430 Answer: C Explanation: NEC Article 450 covers transformers, including overcurrent protection requirements. Question 15. A 125-V, 15-A receptacle must be installed on a branch circuit protected at no more than: A) 15 A B) 20 A C) 30 A D) 40 A Answer: A Explanation: NEC 210.23(A) limits receptacle circuits to the rating of the receptacle, i.e., 15 A for a 15-A receptacle. Question 16. In a residential service entrance, the main disconnecting means must be located: A) Inside the dwelling only B) At the point of service, outside the building
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D) 340
Answer: B Explanation: NEC Article 320 covers AC cable, including installation and grounding requirements. Question 20. When installing a metal-clad (MC) cable, the grounding conductor must be: A) Bare copper only B) Green insulated only C) Either bare copper or green insulated, or the MC’s internal grounding strip if listed D) Not required if the cable is metal-clad Answer: C Explanation: NEC 330.30 allows the use of the internal grounding strip of MC cable if it is listed for grounding. Question 21. The minimum clearance required in front of a panelboard for working space is: A) 24 in B) 30 in C) 36 in D) 42 in Answer: C Explanation: NEC 110.26(A)(1) requires a minimum 36-in. front clearance for equipment. Question 22. A luminaire installed in a clothes closet must be: A) Listed for damp locations B) Listed for wet locations C) Listed for recessed installation only D) Listed for use in closets and rated at least 125 V, 15 A
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Answer: D Explanation: NEC 410.10(D) permits luminaires in closets if they are listed for that use and meet voltage/amp requirements. Question 23. The Full-Load Current (FLC) of a 3-hp, 230-V, single-phase motor is approximately: A) 5 A B) 7 A C) 10 A D) 13 A Answer: B Explanation: Using NEC Table 430-2, a 3-hp single-phase motor at 230 V has an FLC of about 7 A. Question 24. For the motor in Question 23, the minimum rating of the branch-circuit protective device is: A) 125 % of FLC B) 150 % of FLC C) 200 % of FLC D) 250 % of FLC Answer: B Explanation: NEC 430-30 permits a protective device sized up to 150 % of the motor’s FLC. Question 25. A dry-type transformer rated 5 kVA, 240 V primary, must have its overcurrent protection set at: A) 125 % of full-load current B) 150 % of full-load current C) 200 % of full-load current D) 250 % of full-load current Answer: A
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Explanation: NEC 625-2 requires conductors sized for 125 % of the continuous load; 40 A × 1.25 = 50 A, which corresponds to #6 AWG copper (55 A ampacity). Question 29. Which article of the NEC governs emergency systems such as exit lighting? A) 700 B) 710 C) 720 D) 730 Answer: A Explanation: NEC Article 700 covers emergency systems, including exit and emergency lighting. Question 30. A transfer switch installed for a standby generator must be listed for: A) Manual operation only B) Automatic operation only C) Either manual or automatic operation, as listed D) No listing required if installed by a licensed electrician Answer: C Explanation: NEC 702-6 requires transfer switches to be listed for the type of operation they perform. Question 31. In a data-center, network cabling must be separated from power conductors by at least: A) 6 in B) 12 in C) 18 in D) 24 in Answer: B
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Explanation: NEC 800-20 requires a minimum 12-in. separation between power and communication cables to reduce electromagnetic interference. Question 32. Which grounding electrode is NOT acceptable for a residential building? A) Concrete-encased electrode (Ufer) B) Ground rod C) Metal water pipe not bonded to the building D) Metal underground utility pipe Answer: C Explanation: Unbonded metal water pipes cannot serve as a grounding electrode unless bonded per NEC 250-52. Question 33. The minimum size of a grounding electrode conductor (GEC) for a 100 - A service is: A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: C Explanation: NEC Table 250-122 specifies #8 AWG copper for a 100-A service. Question 34. When using PVC conduit outdoors, the conduit must be: A) Listed for direct burial only B) Rigid and non-flexible C) Rated for sunlight exposure (UV) D) Installed without any fittings Answer: C Explanation: PVC conduit used outdoors must be UV-rated to prevent degradation from sunlight.
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Question 38. When installing a receptacle in a garage, the receptacle must be GFCI-protected if the circuit rating does not exceed: A) 15 A B) 20 A C) 30 A D) 50 A Answer: B Explanation: NEC 210-11(C)(2) requires GFCI protection for all 125-V, 15- and 20 - A receptacles in garages. Question 39. Which of the following is a permitted use for a 14-/2 NM cable? A) Outdoor wiring B) In a damp location C) Inside a residential attic that is not accessible D) As a feeder to a subpanel in a garage Answer: D Explanation: 14-/2 NM can be used as a feeder to a subpanel in a garage provided the garage is a dry location and the cable is protected. Question 40. The maximum number of 15-A receptacles allowed on a single 20 - A branch circuit in a dwelling unit is: A) 8 B) 10 C) 12 D) No specific limit, as long as the load does not exceed 80 % of the circuit rating Answer: D Explanation: NEC does not set a fixed receptacle count; the circuit must not be loaded beyond 80 % of its rating for continuous loads. Question 41. In a commercial building, the required grounding electrode system must be bonded to which of the following?
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A) Only the service neutral B) All metal water piping systems C) Only the building steel frame D) Both the service neutral and all metal water piping systems Answer: D Explanation: NEC 250-70 requires bonding of the grounding electrode system to both the service neutral and any metal water piping. Question 42. For a 120-V, 15-A branch circuit that supplies a bathroom vanity light and a receptacle, the required AFCI protection is: A) None required B) Required for the lighting portion only C) Required for the receptacle only D) Required for the entire circuit Answer: D Explanation: NEC 210-300 requires AFCI protection for all 120-V, 15- and 20-A circuits supplying outlets in dwelling unit areas, including bathrooms. Question 43. A 30-A, 240-V dryer circuit must be protected by a breaker sized at: A) 25 A B) 30 A C) 35 A D) 40 A Answer: B Explanation: The circuit breaker must be sized to the branch-circuit rating; a 30 - A dryer requires a 30-A breaker. Question 44. When installing a lighting fixture in a suspended ceiling, the fixture must be: A) Listed for use in a wet location
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C) #6 AWG copper D) #4 AWG copper Answer: C Explanation: NEC Table 310-16 shows #6 AWG copper rated for 65 A at 75 °C, suitable for a 60-A feeder. Question 48. Which of the following is a permitted method for bonding a metal conduit to the grounding system? A) Using a separate grounding electrode B) Installing a bonding jumper at each conduit outlet box C) Relying on the continuity of the conduit system without a bonding jumper D) Using a listed bonding strap at the service entrance only Answer: B Explanation: NEC 250-130(C) requires a bonding jumper to be installed where the metal raceway is not continuous. Question 49. In a commercial kitchen, the hood exhaust fan must be protected by a circuit breaker sized at: A) 125 % of the motor’s FLC B) 150 % of the motor’s FLC C) 175 % of the motor’s FLC D) 200 % of the motor’s FLC Answer: B Explanation: NEC 430-30 permits motor overload protection up to 150 % of the FLC for commercial kitchen exhaust fans. Question 50. The maximum distance a receptacle can be installed from the last outlet in a dwelling’s kitchen countertop circuit is: A) 6 ft B) 8 ft C) 10 ft
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D) 12 ft Answer: D Explanation: NEC 210-52(C)(1) requires receptacles on kitchen countertops to be installed at intervals not exceeding 12 ft. Question 51. Which NEC article addresses requirements for fire alarm and detection systems? A) 700 B) 720 C) 760 D) 770 Answer: B Explanation: NEC Article 720 covers fire alarm and detection systems. Question 52. A 250-V, 30-A circuit feeding a commercial air-conditioning unit must be protected by a breaker that is: A) Not larger than 30 A B) Not larger than 35 A C) Not larger than 40 A D) Not larger than 45 A Answer: A Explanation: The overcurrent device must not exceed the branch-circuit rating; therefore, a 30-A breaker is required. Question 53. The required minimum size for a grounding electrode conductor for a 200-A service is: A) #6 AWG copper B) #4 AWG copper C) #2 AWG copper D) #1/0 AWG copper Answer: B
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Question 57. When a transformer is installed in a building, the secondary grounding electrode must be: A) Connected to the building’s grounding electrode system only if the transformer is isolated B) Never connected to the building ground C) Connected only if the transformer is a dry-type unit D) Always connected to the building’s grounding electrode system Answer: D Explanation: NEC 250-28 requires the secondary of a separately derived system to be grounded to the building’s grounding electrode. Question 58. 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 specified Answer: D Explanation: NEC does not prescribe a minimum receptacle height in a garage; placement is based on practicality. Question 59. Which of the following is a requirement for a panelboard installed in a commercial office space? A) Must be located within 6 ft of the floor B) Must have a minimum of 30 in. of clearance in front C) Must be mounted on a concrete wall only D) Must be protected by a GFCI breaker Answer: B Explanation: NEC 110-26 requires a minimum 30-in. front clearance for panelboards.
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Question 60. The minimum conduit size required to pull three #12 AWG THHN conductors plus a grounding 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: The combined cross-sectional area of three #12 THHN plus a # grounding conductor is about 0.4 in²; 3/4-in. EMT’s internal area (0.824 in²) allows 40 % fill, making it suitable. Question 61. In a residential dwelling, the maximum number of outlets allowed on a single 20-A branch circuit serving the kitchen countertop is: A) 6 outlets B) 8 outlets C) 10 outlets D) No specific limit, provided the load does not exceed 80 % of the circuit rating Answer: D Explanation: NEC does not set a fixed outlet count; the circuit must not exceed 80 % of the 20-A rating for continuous loads. Question 62. Which of the following is NOT an acceptable method to protect a conduit run in a concrete wall? A) Using PVC conduit with concrete-grade fittings B) Using EMT with concrete-filled sleeves C) Using RMC without any sleeves D) Using flexible metal conduit without a protective sleeve Answer: D Explanation: FMC must be protected by a non-metallic protective sleeve when embedded in concrete.
