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Question 1. Which NEC article defines the requirements for grounding electrode systems in residential dwellings? A) Article 210 B) Article 250 C) Article 230 D) Article 300 Answer: B Explanation: Article 250 of the NEC covers grounding and bonding, including the design and installation of grounding electrode systems for all occupancies, residential included. Question 2. In Indianapolis, which department issues electrical permits for new residential construction? A) Indiana Department of Workforce Development B) Indianapolis Department of Business and Neighborhood Services (BNS) C) Marion County Health Department D) Indiana Utility Regulatory Commission Answer: B Explanation: The Indianapolis Department of Business and Neighborhood Services (BNS) is responsible for reviewing and issuing electrical permits within the city. Question 3. According to NEC Article 210.11(C)(1), how many 20‑ampere small‑appliance branch circuits are required for the kitchen of a single‑family dwelling? A) One B) Two C) Three D) Four Answer: B Explanation: NEC 210.11(C)(1) mandates a minimum of two 20 A small‑appliance branch circuits for kitchen countertop receptacles.
Question 4. When performing load calculations using the standard method, what demand factor is applied to the first 3 kW of general lighting load? A) 100 % B) 80 % C) 70 % D) 50 % Answer: A Explanation: The NEC requires the first 3 kW of general lighting load to be taken at 100 % before any demand factor is applied. Question 5. Which of the following wiring methods is permitted for concealed residential branch circuits in walls and ceilings? A) Armored Cable (AC) only B) Nonmetallic‑Sheathed Cable (NM‑B) only C) Both AC and NM‑B D) Only conduit‑filled conductors Answer: C Explanation: Both AC (type AC) and NM‑B (type Romex) are listed in NEC Chapter 3 for concealed residential wiring. Question 6. Under Indiana law, how often must a residential electrical contractor renew their state license? A) Every year B) Every two years C) Every three years D) Every five years Answer: B Explanation: Indiana requires electrical contractors to renew their license biennially (every two years). Question 7. Which NEC article governs the installation of AFCI protection in dwelling unit living areas?
B) Concrete‑encased electrode (Ufer) C) Metal underground storage tank D) Grounding plate Answer: B Explanation: The concrete‑encased electrode (Ufer) is a permanent, low‑impedance grounding method and is required when a water pipe electrode cannot be used (NEC 250.52(A)(3)). Question 11. According to NEC 210.52(A)(1), a dwelling unit must have at least how many general‑purpose receptacles in each wall space 2 ft or wider? A) One B) Two C) Three D) Four Answer: A Explanation: NEC 210.52(A)(1) mandates at least one receptacle outlet in any wall space 2 ft or wider, measured between floor outlets, doors, and windows. Question 12. What is the minimum height above the finished floor for a receptacle outlet installed in a garage according to NEC 210.52(G)? A) 12 inches B) 18 inches C) 24 inches D) 30 inches Answer: B Explanation: NEC 210.52(G) requires garage receptacles to be installed not less than 18 inches above the floor. Question 13. For a 30‑amp dedicated circuit feeding a residential electric dryer, which type of receptacle is required? A) NEMA 5‑15R B) NEMA 6‑15R
C) NEMA 6‑20R
D) NEMA 14‑30R
Answer: D Explanation: Residential dryers typically require a 4‑wire, 30‑A receptacle, NEMA 14‑30R, per NEC 210.23(A)(2). Question 14. When installing NM‑B cable in a residential attic, what is the minimum distance the cable must be kept from the nearest edge of the attic opening? A) 4 inches B) 6 inches C) 8 inches D) 12 inches Answer: B Explanation: NEC 334.30 requires NM‑B cable within 6 inches of the attic opening edge to be protected by guard strips or be installed in a manner that prevents damage. Question 15. Which Indiana statute governs the filing of a mechanic’s lien for residential construction? A) Indiana Code 23‑ 1 ‑ 1 ‑ 5 B) Indiana Code 32‑ 21 ‑ 5 ‑ 1 C) Indiana Code 32‑ 21 ‑ 5 ‑ 2 D) Indiana Code 23‑ 1 ‑ 8 ‑ 1 Answer: C Explanation: Indiana Code 32‑ 21 ‑ 5 ‑2 outlines the requirements for filing a mechanic’s lien on residential improvement projects. Question 16. A homeowner requests a dedicated 20‑A circuit for a countertop microwave. Which NEC article specifies this requirement? A) Article 210. B) Article 210.11(C)(2) C) Article 210.
Answer: B Explanation: NEC 314.16(B) counts each ungrounded conductor that terminates in the device as one fill unit; the breaker’s yoke counts as two conductors (one for each pole). Question 20. The Indianapolis utility company requires a minimum service conductor size of 4/0 AWG aluminum for a 400‑A residential service. Which NEC article addresses service‑entrance conductor sizing? A) Article 230. B) Article 310. C) Article 250. D) Article 220. Answer: A Explanation: NEC 230.42 provides the minimum size of service‑entrance conductors based on the rating of the service disconnect. Question 21. Which NEC article specifies the minimum clearance between a receptacle outlet and a bathtub? A) Article 210.8(A)(10) B) Article 210.8(B) C) Article 210.8(C) D) Article 210.8(D) Answer: A Explanation: NEC 210.8(A)(10) requires GFCI protection for receptacles installed within 6 ft of a bathtub, but the clearance requirement itself is in 210.8(A)(10) and 210.8(A)(11). Question 22. For a residential HVAC unit rated at 5 kW, 240 V, what is the minimum size of the disconnecting means required by NEC 440.14? A) 20 A B) 25 A C) 30 A D) 40 A
Answer: C Explanation: 5 kW ÷ 240 V = 20.8 A. NEC 440.14 requires the disconnect to be rated at least 125 % of the load, giving 26 A; the next standard size is 30 A. Question 23. In a residential wiring diagram, the symbol of a circle with a “G” inside denotes which component? A) Grounding electrode conductor B) Ground fault circuit interrupter C) Grounding electrode D) General lighting circuit Answer: C Explanation: The standard NEC symbol for a grounding electrode is a circle with a “G” inside. Question 24. Which of the following is the correct temperature correction factor for a #8 AWG copper conductor in a location with an ambient temperature of 35 °C (95 °F) when using 75 °C rated insulation? A) 0. B) 0. C) 0. D) 0. Answer: B Explanation: NEC Table 310.15(B)(2)(a) shows a correction factor of 0.88 for 35 °C ambient temperature for 75 °C conductors. Question 25. Under Indiana Business Law, what is the maximum statutory period for filing a notice of lien after completion of residential work? A) 30 days B) 45 days C) 60 days D) 90 days Answer: C
Question 29. Which of the following is NOT a permitted method for grounding a residential metal conduit system? A) Grounding electrode conductor attached to conduit B) Bonding jumper to the service grounding bus C) Using the metal conduit as the equipment grounding conductor only D) Installing a separate grounding rod for the conduit Answer: D Explanation: A separate grounding rod solely for conduit is not required; the conduit can serve as the equipment grounding conductor when properly bonded (NEC 250.118). Question 30. For a residential dryer circuit, what is the required minimum size of the equipment grounding conductor if a 10 AWG copper ungrounded conductor is used? A) #12 AWG copper B) #10 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: B Explanation: NEC 250.122 requires the grounding conductor to be the same size as the ungrounded conductor for circuits up to 60 A; thus #10 AWG copper is required. Question 31. Which NEC article governs the installation of low‑voltage doorbell wiring in a residential dwelling? A) Article 300. B) Article 725 C) Article 800 D) Article 410 Answer: B Explanation: NEC Article 725 covers Class 2 and Class 3 circuits, including low‑voltage doorbell wiring.
Question 32. In a multi‑family building, the service load calculation must apply a demand factor of what percentage for the first 10 kW of general lighting? A) 100 % B) 80 % C) 70 % D) 50 % Answer: A Explanation: NEC 220.42 requires the first 10 kW of general lighting load to be taken at 100 % before demand factors are applied. Question 33. According to NEC 300.4(D), how far must a non‑metallic cable be kept from a metal water pipe to avoid inductive heating? A) 1 in B) 2 in C) 3 in D) 4 in Answer: B Explanation: NEC 300.4(D) requires a minimum separation of 2 inches between NM cable and metal water piping to prevent inductive heating. Question 34. Which OSHA standard specifically addresses the use of personal protective equipment (PPE) for electricians working on live parts? A) 1926. B) 1910. C) 1910. D) 1926. Answer: B Explanation: OSHA 1910.133 covers the selection and use of eye and face protection, which includes PPE for electricians handling live parts.
A) #8 AWG copper B) #6 AWG copper C) #4 AWG copper D) #2 AWG copper Answer: B Explanation: NEC 250.122 Table 250.122 specifies that a #2 AWG copper ungrounded conductor requires a #6 AWG copper grounding electrode conductor. Question 39. For a residential 120/240‑V split‑phase service, the neutral must be bonded to the grounding electrode at which location? A) At the utility transformer only B) At the service disconnect only C) At both the service disconnect and the main panel D) At the main panel only Answer: B Explanation: NEC 250.24(A) requires the neutral‑ground bond to be made at the service disconnect (the first means of disconnect). Question 40. Which NEC article specifies the requirements for the installation of electric vehicle (EV) charging equipment in a dwelling? A) Article 210. B) Article 625 C) Article 210. D) Article 430 Answer: B Explanation: NEC Article 625 covers the installation of electric vehicle charging systems, including residential applications. Question 41. In Indiana, what is the minimum workers’ compensation insurance coverage required for a residential electrical contractor with five employees? A) $100,000 per employee
B) $500,000 per accident C) $1,000,000 per accident D) No minimum; depends on payroll Answer: D Explanation: Indiana workers’ compensation premiums are based on payroll; there is no fixed dollar minimum, but coverage must be in place for all employees. Question 42. According to NEC 210.23(A)(1), a 20‑A branch circuit may supply a total load not exceeding what percentage of the circuit’s rating? A) 50 % B) 60 % C) 80 % D) 100 % Answer: D Explanation: NEC 210.23(A)(1) permits a 20‑A circuit to supply a continuous load up to 100 % of its rating, provided the load is not a fixed appliance requiring dedicated circuits. Question 43. When installing a pool pump motor, which NEC article dictates the required bonding of the motor’s metal frame? A) 250.92(A) B) 430. C) 440. D) 210.8(B) Answer: B Explanation: NEC 430.92 requires bonding of the motor frame to the equipment grounding conductor for motor circuits. Question 44. A residential circuit feeding a bathroom exhaust fan is 15 A on a 120‑V single‑phase system. What is the maximum continuous load allowed on this circuit? A) 12 A B) 13 A
D) 250.64(C)
Answer: A Explanation: NEC 250.52(A)(3) specifically lists the concrete‑encased electrode as an acceptable grounding electrode. Question 48. When a residential electrician installs a new receptacle in a wet location, which type of receptacle must be used? A) Standard 15‑A receptacle B) Weather‑resistant (WR) receptacle C) GFCI receptacle only D) Tamper‑resistant (TR) receptacle only Answer: B Explanation: NEC 406.9(A) requires weather‑resistant (WR) receptacles in wet locations such as outdoors or in damp basements. Question 49. In a residential panel, the main breaker must be rated at not more than what percentage above the calculated service load? A) 100 % B) 125 % C) 150 % D) 200 % Answer: B Explanation: NEC 230.42 allows the service disconnect to be sized at not less than the calculated load and not more than 125 % of that load. Question 50. Which NEC article specifies the minimum spacing between receptacle outlets in a kitchen countertop area? A) 210.52(C)(1) B) 210.52(C)(2) C) 210.52(D) D) 210.52(E)
Answer: A Explanation: NEC 210.52(C)(1) requires receptacle outlets to be installed so that no point along the countertop is more than 24 inches from a receptacle. Question 51. For a residential dryer that uses a 4‑wire connection, which conductor is NOT required? A) Two ungrounded (hot) conductors B) One neutral conductor C) One equipment grounding conductor D) A separate bonding jumper to the water pipe Answer: D Explanation: The 4‑wire dryer connection includes two hots, a neutral, and a grounding conductor; a separate bonding jumper to the water pipe is not part of the dryer circuit. Question 52. Which NEC article addresses the installation of electric baseboard heaters in a dwelling? A) 210.11(C)(2) B) 422. C) 440. D) 210.23(A)(2) Answer: B Explanation: NEC Article 422.13 provides the requirements for fixed electric space‑heating equipment, including baseboard heaters. Question 53. When a residential electrician installs a new circuit for a wall‑mounted air‑conditioner, what is the minimum size of the disconnecting means required by NEC 440.14? A) 15 A B) 20 A C) 30 A D) 40 A Answer: C
Explanation: NEC 310.15(B)(3)(a) provides the derating factors for more than three current‑carrying conductors in a raceway. Question 57. Which of the following is the correct minimum burial depth for a residential underground service entrance cable protected by PVC conduit, according to NEC 300.5(D)? A) 12 inches B) 18 inches C) 24 inches D) 30 inches Answer: B Explanation: NEC 300.5(D) requires a minimum burial depth of 18 inches for PVC‑protected service entrance conductors. Question 58. When a residential electrician installs a new receptacle on a concrete slab, what must be installed beneath the outlet box to protect the wiring? A) Plastic conduit only B) Grounding electrode conductor C) A concrete‑encased grounding electrode D) A metal plate or conduit with a minimum 1‑inch clearance from the slab surface Answer: D Explanation: NEC 300.4(A) requires a metal plate or conduit to protect the box and wiring from direct contact with concrete, providing at least 1 inch of clearance. Question 59. Which NEC article dictates the requirements for the installation of a receptacle for a pool pump? A) 680. B) 680. C) 680. D) 680. Answer: B
Explanation: NEC 680.24 specifically addresses the requirements for receptacles and disconnecting means for pool pump equipment. Question 60. For a residential 120‑V, 15‑A lighting circuit, the maximum number of 120‑W recessed fixtures that can be installed without exceeding the circuit rating is: A) 10 B) 12 C) 14 D) 16 Answer: B Explanation: 120 W × 12 = 1440 W; 1440 W ÷ 120 V = 12 A, which is within the 15‑A circuit rating (allowing 80 % continuous load). Question 61. Which NEC article requires that all receptacles installed in a dwelling’s laundry area be on a dedicated 20‑A circuit? A) 210.11(C)(2) B) 210.11(C)(3) C) 210.52(F) D) 210.8(A)(3) Answer: A Explanation: NEC 210.11(C)(2) mandates a dedicated 20‑A branch circuit for laundry equipment. Question 62. In Indiana, the minimum liability insurance coverage for a residential electrical contractor is: A) $100,000 per occurrence B) $250,000 per occurrence C) $500,000 per occurrence D) No statutory minimum; determined by contract Answer: D Explanation: Indiana does not set a statutory minimum for general liability; coverage is typically defined by client contracts and industry standards.
