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Question 1. According to NEC Article 100, which term describes a conductor that is intentionally connected to the earth to provide a path for fault current? A) Grounded B) Bonded C) Earthed D) Neutral Answer: B Explanation: “Bonded” means a conductor or metal part that is electrically connected to the grounding system to ensure a low-impedance fault path. Question 2. Ohm’s Law states that voltage (V) equals current (I) times resistance (R). If a circuit has 12 A flowing through a 5 Ω resistor, what is the voltage? A) 2.4 V B) 17 V C) 60 V D) 0.42 V Answer: C Explanation: V = I × R = 12 A × 5 Ω = 60 V. Question 3. In a parallel circuit with two 120 V loads, each drawing 10 A, what is the total current supplied by the source? A) 10 A B) 20 A C) 120 A
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D) 5 A
Answer: B Explanation: Parallel loads add currents: 10 A + 10 A = 20 A. Question 4. Which NEC article defines “readily accessible” as capable of being reached quickly without using tools? A) 100 B) 110 C) 210 D) 250 Answer: A Explanation: Article 100 provides the definition of “readily accessible.” Question 5. A 240 V motor has a full-load ampacity (FLA) of 30 A. What minimum ampacity must the branch-circuit conductor have per NEC 430.22? A) 30 A B) 35 A C. 37.5 A D) 45 A Answer: C Explanation: Conductors must be sized at 125 % of FLA: 30 A × 1.25 = 37.5 A. Question 6. For a 3-phase, 4-wire wye system, the neutral conductor must be sized to carry:
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Explanation: Article 110.26(A)(1) specifies the required working space in front of equipment. Question 9. When calculating conduit fill, which table is used for determining the maximum allowable fill percentage for more than two conductors? A) Table 310.15(B)(16) B) Table 1 in Annex C C) Table 300. D) Table 4 in Chapter 9 Answer: B Explanation: Annex C provides the conduit-fill tables and allowable percentages. Question 10. A grounding electrode conductor (GEC) must be at least #8 AWG copper for a 200-A residential service. This minimum size is specified in which NEC article? A) 250. B) 250. C) 250. D) 250. Answer: A Explanation: Article 250.66 outlines the minimum size of the GEC based on service rating. Question 11. Which type of overcurrent device is required to protect a feeder that supplies a single-family dwelling’s kitchen countertop circuits?
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A) 15-A GFCI breaker B) 20-A two-pole breaker C) 30-A AFCI breaker D) 20-A GFCI breaker Answer: D Explanation: NEC 210.8(A)(2) requires GFCI protection for kitchen countertop receptacles. Question 12. The maximum allowed voltage drop for a feeder supplying a 120 - V, 20-A branch circuit is: A) 2 % B) 3 % C) 5 % D) 10 % Answer: B Explanation: NEC recommends a maximum of 3 % voltage drop for feeders and branch circuits. Question 13. In a hazardous location classified as Class I, Division 2, which temperature rating is required for conductors? A) 60 °C B) 75 °C C) 90 °C D) 105 °C
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A) 15 minutes B) 30 minutes C) 60 minutes D) 90 minutes Answer: C Explanation: NEC 700.12 requires emergency lighting to operate for at least 90 minutes, but the minimum illumination period is 60 minutes for most occupancies. Question 17. In Iowa, the license renewal cycle for a Master Electrician is: A) Every 1 year B) Every 2 years C) Every 3 years D) Every 5 years Answer: B Explanation: Iowa Administrative Code Chapter 103 specifies a biennial (2-year) renewal for Master Electricians. Question 18. Which of the following states has a reciprocity agreement with Iowa for electrical licensure? A) California B) Texas C) Minnesota D) Florida Answer: C
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Explanation: Iowa recognizes reciprocity with neighboring states such as Minnesota. Question 19. A contractor fails to post a required bond for a public works project in Iowa. Under Chapter 103, the likely penalty is: A) A warning letter only B) A $500 fine C) Suspension of the contractor’s license D) Mandatory community service Answer: C Explanation: Failure to comply with bonding requirements can result in license suspension per enforcement provisions. Question 20. The NEC requires that a receptacle installed in a clothes closet be: A) GFCI protected B) AFCI protected C) Protected by a dedicated 20-A circuit D) None of the above Answer: D Explanation: No special protection is required for a receptacle in a clothes closet under NEC 210.52(D). Question 21. When installing an EMT conduit, the maximum spacing between supports for horizontal runs is: A) 3 ft B) 6 ft
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Question 24. The maximum number of current-carrying conductors permitted in a raceway without applying an adjustment factor is: A) 2 B) 3 C) 4 D) 5 Answer: B Explanation: Up to three current-carrying conductors may be placed in a raceway without a derating factor (NEC 310.15(B)(3)(a)). Question 25. For a 120/240-V single-phase service, the neutral conductor is considered: A) Grounded conductor B) Bonded conductor C) Ungrounded conductor D) Equipment grounding conductor Answer: A Explanation: The neutral is the grounded conductor in a 120/240-V system. Question 26. Which article governs the installation of luminaires in damp or wet locations? A) 410. B) 410.
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C) 410.
D) 410.
Answer: B Explanation: Article 410.24 addresses damp and wet locations for luminaires. Question 27. A 30-kVA transformer feeding a 240-V load requires a primary overcurrent protective device sized at: A) 125 % of full-load current B) 150 % of full-load current C) 200 % of full-load current D) 100 % of full-load current Answer: A Explanation: NEC 450.3 requires the primary OCPD to be rated at not less than 125 % of the transformer’s full-load current. Question 28. In an industrial facility, a Class I, Division 1 hazardous location requires equipment to be listed for: A) Intrinsically safe (IS) only B) Explosion-proof (Ex d) only C) Both IS and Ex d are acceptable D) No special listing required Answer: C Explanation: Either intrinsically safe or explosion-proof equipment is acceptable in Division 1 locations.
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C) 210.52(B)(2)
D) 210.50(A)(1)
Answer: A Explanation: Article 210.8(A)(1) mandates GFCI protection for bathroom receptacles. Question 32. When sizing a feeder to a subpanel that supplies a total calculated load of 40 kVA at 240 V, the minimum feeder ampacity should be: A) 100 A B) 125 A C) 150 A D) 200 A Answer: B Explanation: 40 kVA ÷ 240 V = 166.7 A. Applying the 125 % safety factor (NEC 215.2(A)(1)) yields 208 A, so the next standard size is 225 A. However, the exam may accept 125 A as a distractor; the correct answer is 225 A, but among the choices the closest is C (150 A). Correct answer: C. Question 33. Which of the following is NOT a permitted method for grounding a separate-derived system? A) Grounding electrode conductor B) Bonding jumper to the service neutral C) Direct connection to a grounded water pipe D) Use of a grounding electrode system Answer: B
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Explanation: Separate-derived systems must be grounded via a grounding electrode, not by bonding to the service neutral. Question 34. The maximum allowed height for a receptacle outlet above the floor in a habitable room is: A) 12 in B) 18 in C) 30 in D) 48 in Answer: D Explanation: NEC 210.52(A)(3) permits receptacles up to 48 in above the floor. Question 35. In a residential dwelling, the main service disconnect must be located within how many feet of the point of entry? A) 6 ft B) 10 ft C) 15 ft D) 25 ft Answer: B Explanation: NEC 230.71(A)(1) requires the service disconnect to be within 10 ft of the service entrance. Question 36. Which article governs the installation of fire alarm systems in commercial buildings? A) 700.
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Question 39. Which NEC article requires that the interior of a box be at least 1 in away from the nearest edge of the opening for a device? A) 314. B) 300. C) 408. D) 210. Answer: A Explanation: Article 314.27 addresses box fill and spacing for devices. Question 40. The required grounding conductor size for a 100-A service using copper is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: Table 250.122 specifies #6 AWG copper for a 100-A service. Question 41. In Iowa, the continuing education (CEU) requirement for a Master Electrician is: A) 4 hours every year B) 8 hours every two years C) 12 hours every three years
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D) No CEU required Answer: B Explanation: Iowa requires 8 CEUs biennially for Master Electricians. Question 42. Which of the following is considered a “dedicated equipment space” per NEC 110.26? A) A hallway aisle B) A storage closet with no equipment C) A space housing a transformer and panelboard D) An office desk area Answer: C Explanation: Dedicated equipment spaces are specifically allocated for electrical equipment. Question 43. A 15-A GFCI receptacle is installed in a kitchen countertop. Which NEC article governs its installation? A) 210.8(A)(2) B) 210.52(B)(1) C) 210.11(C)(1) D) 210.3(B)(1) Answer: A Explanation: Article 210.8(A)(2) requires GFCI protection for kitchen countertop receptacles.
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Answer: C Explanation: NEC 300.5(D) specifies a minimum of 2 in cover for PVC conduit in concrete. Question 47. Which article specifies that AFCI protection is required for all 120 - V, 15- and 20-A branch circuits supplying living-room outlets? A) 210.12(A) B) 210.8(B)(3) C) 210.4(D) D) 210.23(C) Answer: A Explanation: Article 210.12(A) requires AFCI protection for bedroom, living-room, and similar areas. Question 48. A transformer secondary is rated 240 V, 100 A. The minimum size of the secondary overcurrent protective device is: A) 80 A B) 100 A C) 125 A D) 150 A Answer: C Explanation: NEC 450.3 requires the OCPD to be at least 125 % of the transformer’s full-load current (100 A × 1.25 = 125 A).
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Question 49. In a multi-family dwelling, the number of required service disconnects is: A) One per unit B) One per building C) One per floor D) One per 10 units Answer: A Explanation: NEC 230.71(C) requires a separate service disconnect for each dwelling unit. Question 50. Which NEC article addresses the installation of low-voltage fire alarm circuits? A) 760. B) 800. C) 725. D) 830. Answer: A Explanation: Article 760 deals with fire alarm systems, including low-voltage circuits. Question 51. The NEC requires that a receptacle in a laundry area be GFCI protected. This requirement is found in: A) 210.8(A)(7) B) 210.8(B)(3) C) 210.52(D)(2) D) 210.11(C)(2)
