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Ultimate Exam
Question 1. According to NEC Article 100, which term best describes a part of an electrical system that can be reached without removing barriers or other equipment? A) Isolated B) Accessible C) Restricted D) Enclosed Answer: B Explanation: “Accessible” means capable of being reached for operation, adjustment, or inspection without removing any part of the equipment or the building structure. Question 2. NEC Article 110 requires a minimum workspace clearance in front of a panelboard. What is the required width of this clearance? A) 24 in. B) 30 in. C) 36 in. D) 42 in. Answer: C Explanation: A minimum clear working space of 36 in. wide is required in front of any panelboard or switchgear. Question 3. Which tool is specifically required for verifying the polarity of a receptacle during troubleshooting? A) Voltage tester B) Clamp meter C) Continuity tester
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D) Polarity tester Answer: D Explanation: A polarity tester checks that hot and neutral are correctly connected on a receptacle. Question 4. Overhead service conductors must be supported at intervals not exceeding what maximum distance according to NEC? A) 10 ft B) 25 ft C) 50 ft D) 75 ft Answer: C Explanation: NEC 230.21(A) limits the span of overhead service conductors to 50 ft between supports. Question 5. For underground service conductors, the minimum burial depth in residential areas is: A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: B Explanation: NEC 300.5(A)(1) requires a minimum of 18 in. burial for residential underground service conductors. Question 6. The service disconnecting means must be located: A) Within 5 ft of the service entrance.
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Question 9. In a residential kitchen, the required number of 20-A receptacle circuits for countertop outlets is: A) One B) Two C) Three D) Four Answer: B Explanation: NEC 210.52(C)(1) mandates at least two 20-A small-appliance circuits for countertop receptacles. Question 10. Which location in a dwelling requires GFCI protection for a receptacle? A) Living room B) Bedroom C) Closet D) Bathroom Answer: D Explanation: NEC 210.8(A)(1) requires GFCI protection for all bathroom receptacles. Question 11. An AFCI is required for which of the following circuits in a new home? A) Outdoor 120-V receptacle B) Bedroom lighting circuit C) Garage door opener circuit D) Refrigerator circuit
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Answer: B Explanation: NEC 210.12(A) requires AFCI protection for all 120-V branch circuits supplying bedroom outlets. Question 12. The THHN insulation rating is suitable for which maximum temperature? A) 60 °C (140 °F) B) 75 °C (167 °F) C) 90 °C (194 °F) D) 105 °C (221 °F) Answer: C Explanation: THHN is rated for 90 °C (194 °F) in dry locations. Question 13. When derating conductors for more than three current-carrying conductors in a conduit, the NEC requires which adjustment factor for four conductors? A) 80 % B) 70 % C) 85 % D) 90 % Answer: A Explanation: NEC Table 310.15(B)(3)(a) shows an 80 % adjustment for 4- 6 current-carrying conductors. Question 14. Which raceway material is permitted for use in wet locations without a moisture barrier? A) EMT
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A) A grounding electrode conductor B) An equipment grounding conductor inside a cable C) A metal water pipe bonded to the service equipment D) A neutral conductor connected to a transformer Answer: C Explanation: Bonding jumpers connect non-current-carrying metal parts (e.g., water pipe) to the grounding system. Question 18. For a luminaire installed in a damp location (e.g., a covered porch), which marking is required? A) “Wet” B) “Dry” C) “Damp” D) “Outdoor” Answer: C Explanation: NEC 410.10(A) requires “Damp” marking for fixtures installed in damp, non-wet locations. Question 19. A commercial dryer must have a dedicated circuit protected at what minimum amperage? A) 15 A B) 20 A C) 30 A D) 40 A Answer: C Explanation: NEC 210.23(A)(2) requires a dedicated 30 A branch circuit for a dryer.
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Question 20. The minimum clearance in front of a panelboard in a commercial building is: A) 30 in. B) 36 in. C) 42 in. D) 48 in. Answer: B Explanation: NEC 110.26(A)(1) requires a minimum of 36 in. of clear working space in front of equipment. Question 21. A single-phase motor rated 7.5 hp at 460 V requires which minimum size copper conductor for the feeder, assuming 75 °C terminals? A) #4 AWG B) #3 AWG C) #2 AWG D) #1 AWG Answer: C Explanation: Using NEC Table 430.250, a 7.5 hp motor at 460 V requires #2 AWG copper for 75 °C; however, rounding up for conduit fill results in #2 AWG (closest larger size). Question 22. The disconnecting means for a motor must be located: A) Within 6 ft of the motor. B) Inside the same room as the motor. C) Not more than 30 ft from the motor. D) At the nearest convenient location.
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B) Article 680 C) Article 690 D) Article 500 Answer: B Explanation: NEC Article 680 covers swimming pools, fountains, and similar installations. Question 26. When calculating voltage drop, the recommended maximum drop for branch circuits is: A) 1 % B) 2 % C) 3 % D) 5 % Answer: C Explanation: NEC recommends a maximum of 3 % voltage drop for branch circuits (combined 5 % for feeder + branch). Question 27. A feeder serving a continuous load of 30 A must be sized at least: A) 30 A B) 35 A C) 38 A D) 40 A Answer: C Explanation: Multiply 30 A by 125 % → 37.5 A; round up to the next standard size, 38 A.
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Question 28. The neutral conductor of a 3-phase, 4-wire wye system must be sized at least: A) 100 % of the largest unbalanced load B) 125 % of the largest unbalanced load C) 150 % of the largest unbalanced load D) Same size as the phase conductors regardless of load Answer: A Explanation: NEC 220.61 requires the neutral to be sized for the maximum unbalanced load, not exceeding 100 % of it. Question 29. According to NEC Chapter 9, the minimum conduit size for three #6 AWG THHN conductors (plus a #10 AWG ground) is: A) 1/2 in. EMT B) 3/4 in. EMT C) 1 in. EMT D) 1-1/4 in. EMT Answer: B Explanation: Using Table 5, three #6 AWG plus a #10 AWG fill 40 % of the conduit’s cross-section, requiring at least 3/4 in. EMT. Question 30. A box that must accommodate a single 20-A circuit breaker, two #12 conductors, and a device must have a minimum volume of: A) 12 cu in. B) 18 cu in. C) 24 cu in. D) 30 cu in.
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B) A person who has completed an apprenticeship and holds a valid license. C) Any person who works under a licensed electrician. D) A student in an electrical trade program. Answer: B Explanation: The Texas Occupations Code defines a journeyman electrician as someone who has completed the required apprenticeship and holds the appropriate license. Question 34. Under TDLR Administrative Rule Chapter 73, how often must a Texas electrician renew their license? A) Every year B) Every two years C) Every three years D) Every five years Answer: B Explanation: TDLR Rule 73.10 requires renewal of the electrician license every two years. Question 35. NFPA 70E requires which of the following before performing work on energized equipment? A) A lockout-tagout (LOTO) procedure only. B) A risk assessment and appropriate PPE. C) Only a written permit. D) No special precautions if voltage is below 120 V. Answer: B Explanation: NFPA 70E mandates a hazard/risk assessment and the use of suitable personal protective equipment before energized work.
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Question 36. OSHA standard 1910.333(b)(1) requires the use of insulated tools when working on circuits above what voltage? A) 50 V B) 100 V C) 250 V D) 600 V Answer: B Explanation: OSHA requires insulated tools for any circuit rated over 100 V. Question 37. Which of the following is NOT considered a “continuous load” under NEC definitions? A) A commercial kitchen hood fan that runs 24 h/day. B) An office air-conditioning unit that runs for 6 h/day. C) A freezer that operates continuously. D) A water-heater that cycles on and off. Answer: D Explanation: A water-heater cycles on/off and is not a continuous load (continuous load runs for 3 h or more continuously). Question 38. When installing a receptacle in a wet location, which type of enclosure is required? A) NEMA 1 B) NEMA 3R C) NEMA 4 D) NEMA 6
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A) EMT conduit B) PVC conduit C) Rigid metal conduit (RMC) D) Flexible metal conduit (FMC) Answer: B Explanation: PVC conduit is listed for direct burial; metal raceways require a protective covering unless specifically rated. Question 42. A 30-A GFCI circuit breaker is installed to protect a 120-V receptacle in a garage. Which statement is correct? A) The breaker must be a 2-pole device. B) The breaker can be single-pole. C) GFCI protection is not required in a garage. D) The breaker must be a 15-A device. Answer: B Explanation: A single-pole 30-A GFCI breaker can protect a 120-V garage receptacle per NEC 210.8(A)(2). Question 43. Which NEC article governs the installation of fire alarm circuits? A) Article 210 B) Article 300 C) Article 760 D) Article 800 Answer: C Explanation: NEC Article 760 covers fire alarm systems.
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Question 44. The minimum size of an equipment grounding conductor for a 20-A circuit using 12-AWG copper conductors is: A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: A Explanation: Table 250.122 specifies #14 AWG copper for a 20-A circuit. Question 45. In a commercial building, the required number of receptacles per floor for general-purpose use (excluding dedicated appliances) is: A) One per 100 ft² B) One per 150 ft² C) One per 200 ft² D) One per 250 ft² Answer: B Explanation: NEC 210.52(C)(2) requires one receptacle per 150 ft² of floor area in commercial spaces. Question 46. Which of the following is a permissible method for bonding a metal conduit system to the grounding electrode? A) Using a separate grounding conductor only. B) Relying on the conduit’s continuity without a bonding jumper. C) Installing a grounding strap at each junction box. D) Using a grounding lug on the service equipment. Answer: D
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C) The breaker is a “dual-pole” type. D) It is not permitted; a 2-pole breaker is required. Answer: D Explanation: A 240-V motor requires a 2-pole breaker for proper phase protection. Question 50. The voltage rating printed on a receptacle indicates: A) The maximum voltage the device can safely handle. B) The operating voltage of the circuit. C) The voltage drop allowed across the device. D) The recommended voltage for the connected load. Answer: A Explanation: The rating on a receptacle reflects its maximum voltage rating for safe operation. Question 51. When installing a feeder in a metal raceway that also serves as the equipment grounding conductor, the grounding conductor must be: A) The same size as the largest ungrounded conductor. B) At least #10 AWG copper. C) Not required because the raceway itself is grounding. D) At least #12 AWG copper regardless of load. Answer: C Explanation: A metal raceway provides an equipment grounding path; a separate grounding conductor is not required unless required by other code provisions. Question 52. A 120-V receptacle in a laundry room must be GFCI protected. Which NEC article mandates this?
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A) 210.8(A)(1)
B) 210.8(A)(7)
C) 210.8(B)(2)
D) 210.8(C)(1)
Answer: B Explanation: NEC 210.8(A)(7) requires GFCI protection for laundry room receptacles. Question 53. The minimum conduit fill for a single #4 AWG THHN conductor is: A) 40 % B) 53 % C) 60 % D) 70 % Answer: B Explanation: NEC Table 1 in Chapter 9 permits a maximum fill of 53 % for a single conductor in a conduit. Question 54. A conduit body (C-type) must have a minimum volume of: A) 2 cu in. B) 4 cu in. C) 6 cu in. D) 8 cu in. Answer: B Explanation: NEC 314.28 requires a minimum of 4 cu in. for a conduit body.
