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Electrician Ultimate Exam
Question 1. Which NEC article defines the term “accessible” as used in electrical installations? A) Article 100 B) Article 110 C) Article 210 D) Article 300 Answer: A Explanation: Article 100 contains definitions for terms such as “accessible,” “accessible,” and “accessible,” establishing their meaning for the Code. Question 2. In a dwelling, the minimum working space clearance in front of a panelboard must be at least: A) 24 inches wide B) 30 inches wide C) 36 inches wide D) 42 inches wide Answer: C Explanation: NEC 110.26(A)(1) requires a minimum clear working space of 30 inches wide, 36 inches deep, and 6.5 feet high; the width must be at least 30 inches, but the depth is 36 inches, so the answer is the depth requirement, 36 inches. Question 3. Ohm’s Law is expressed as: A) P = I × V B) V = I × R C) I = V / P D) R = P / I
Electrician Ultimate Exam
Answer: B Explanation: Ohm’s Law states that voltage (V) equals current (I) times resistance (R). Question 4. A 120-V, 15-A circuit supplies a receptacle. What is the maximum allowable load in watts on this circuit? A) 1500 W B) 1800 W C) 2000 W D) 2400 W Answer: B Explanation: Power = V × I = 120 V × 15 A = 1800 W. Question 5. Which of the following is considered a “continuous load” according to NEC Article 100? A) A motor that runs for 1 hour per day B) Lighting that operates for less than 3 hours continuously C) A commercial refrigeration unit that runs 24 hours a day D) A dryer that cycles for 30 minutes each use Answer: C Explanation: A continuous load is any load expected to run for three hours or more without interruption; a 24-hour refrigeration unit meets this definition. Question 6. For an overhead service entrance, the minimum clear distance between the service drop and any grounded metal water pipe is: A) 6 in.
Electrician Ultimate Exam
Question 9. When grounding a metal water pipe that is not already bonded, the grounding electrode conductor must be attached: A) Within 5 ft of the pipe entrance B) At the first accessible point downstream of the service entrance C) At the point of entry into the building D) Only at the water heater Answer: B Explanation: NEC 250.52(A)(1) requires bonding at the first point where the pipe becomes accessible downstream of the service disconnect. Question 10. The general lighting load for a dwelling unit is calculated as: A) 1 VA per square foot of floor area B) 2 VA per square foot of floor area C) 3 VA per square foot of floor area D) 4 VA per square foot of floor area Answer: B Explanation: NEC 220.12 requires 3 VA per square foot for general lighting, but the dwelling unit calculation uses 3 VA per square foot for lighting plus 1.5 VA per square foot for small-appliance circuits; the question asks only for lighting, thus 3 VA is correct. (Correction: The correct answer is C – 3 VA per sq ft.) Question 11. A small-appliance branch circuit in a kitchen must be rated for at least: A) 15 A B) 20 A
Electrician Ultimate Exam
C) 30 A
D) 40 A
Answer: B Explanation: NEC 210.11(C)(1) requires 20-amp small-appliance circuits in kitchen countertop areas. Question 12. The minimum number of dedicated 20-A small-appliance circuits required in a kitchen with a dining area is: A) One B) Two C) Three D) Four Answer: B Explanation: NEC 210.11(C)(1) mandates at least two 20-A small-appliance circuits for kitchens and dining areas. Question 13. A laundry circuit must be protected by a breaker of no greater than: A) 15 A B) 20 A C) 30 A D) 40 A Answer: B Explanation: NEC 210.11(C)(2) requires a dedicated 20-amp circuit for laundry receptacles.
Electrician Ultimate Exam
Answer: B Explanation: Table 310.15(B)(3)(a) provides a factor of 0.94 for four conductors at 40 °C. Question 17. Which raceway type is permitted for exposed installation in a damp location? A) Rigid metal conduit (RMC) only B) Electrical metallic tubing (EMT) only C) PVC conduit (Schedule 40) only D) Both RMC and PVC conduit Answer: D Explanation: Both RMC (metallic) and PVC (non-metallic) are listed for use in damp locations per NEC 352 and 358. Question 18. The maximum fill for a single-gang device box containing two insulated conductors, a grounding conductor, and a device (switch) is: A) 2 in³ B) 4 in³ C) 6 in³ D) 8 in³ Answer: B Explanation: Table 314.16(B) shows a 4 in³ fill for a single-gang box with two conductors plus a device. Question 19. When using NM-B (Romex) cable, the cable must be supported at intervals not exceeding:
Electrician Ultimate Exam
A) 3 ft B) 4.5 ft C) 6 ft D) 8 ft Answer: B Explanation: NEC 334.30 requires NM cable to be secured within 4.5 ft of each box and at intervals not exceeding 4.5 ft. Question 20. The minimum size of an equipment grounding conductor (EGC) for a 20-A branch 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 indicates a 14 AWG copper EGC is required for a 20-A circuit. Question 21. In a wet location, a receptacle must be: A) GFCI protected only if within 6 ft of a sink B) Listed for wet locations and GFCI protected if within 6 ft of a bathtub C) GFCI protected regardless of distance D) Not permitted at all Answer: C
Electrician Ultimate Exam
C) 12 A
D) 14 A
Answer: B Explanation: Using NEC Table 430.250, a 5-HP, 208-V, 3-phase motor has an FLC of about 10 A per phase. Question 25. Which NEC article governs the installation of fire alarm systems? A) Article 300 B) Article 410 C) Article 760 D) Article 800 Answer: C Explanation: Article 760 covers fire alarm systems, including wiring methods and power sources. Question 26. The minimum distance between a receptacle and the edge of a bathtub is: A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: C Explanation: NEC 210.8(A)(3) requires a minimum 24-in. clearance from the bathtub rim.
Electrician Ultimate Exam
Question 27. A 30-A, 120/240-V dryer circuit must be protected by a breaker that is: A) 25 A B) 30 A C) 35 A D) 40 A Answer: B Explanation: NEC 210.23(A)(2) allows the branch-circuit rating to equal the appliance rating, so a 30-A breaker is appropriate. Question 28. The maximum number of disconnecting means permitted on a single service entrance for a residential dwelling is: A) 1 B) 2 C) 4 D) No limit Answer: A Explanation: NEC 230.71 limits residential services to a single disconnecting means. Question 29. When installing a transformer for a 120/240-V, 5 kVA load, the overcurrent protection for the secondary must not exceed: A) 15 A B) 20 A C) 25 A D) 30 A
Electrician Ultimate Exam
Question 32. For a swimming pool pump motor rated at 1 HP, 240 V, the required conductors in a raceway must be sized for: A) 125 % of full-load current B) 150 % of full-load current C) 200 % of full-load current D) Exactly the full-load current Answer: A Explanation: NEC 430.22 requires motor branch-circuit conductors to be sized at least 125 % of the motor’s full-load current. Question 33. The minimum distance between a pool light fixture and the water surface is: A) 12 in. B) 24 in. C) 36 in. D) 48 in. Answer: C Explanation: NEC 680.23(A) requires pool lighting to be installed at least 36 in. above the water surface. Question 34. A photovoltaic (PV) array must be marked with its: A) Manufacturer only B) Maximum voltage only C) Maximum current only D) System voltage, maximum current, and disconnecting means location
Electrician Ultimate Exam
Answer: D Explanation: NEC 690.41 requires PV modules and arrays to be labeled with system voltage, maximum current, and the location of the disconnect. Question 35. The required ampacity of an emergency lighting circuit that supplies 20 W of lamps on a 120-V system is: A) 0.2 A B) 0.5 A C) 1 A D) 2 A Answer: C Explanation: Load = 20 W / 120 V = 0.167 A; rounding up to the next standard breaker size gives a 1-A rating (though 15-A is typical, the minimum required is 1 A). Question 36. In Wyoming, the minimum number of continuing-education hours required for a journeyman electrician renewal is: A) 8 hours every 2 years B) 12 hours every 3 years C) 16 hours every 3 years D) 24 hours every 5 years Answer: C Explanation: Wyoming state regulation mandates 16 CEU hours per three-year renewal cycle for journeyman electricians. Question 37. Which of the following is NOT a permissible location for a temporary electrical permit in Wyoming?
Electrician Ultimate Exam
Explanation: Table 1 in Chapter 9 of the NEC permits a maximum of 40 % fill for three conductors, but for EMT the actual allowable fill for three 12-AWG THHN is about 30 % of the conduit cross-section. Question 40. When using a metal raceway as the equipment grounding conductor, the raceway must be: A) Grounded at each end B) Grounded at one end only C) Not grounded at all D) Grounded only at the source equipment Answer: B Explanation: NEC 250.118 permits a metal raceway to serve as an EGC if it is bonded at the source (one end) only. Question 41. The minimum size of a copper grounding electrode conductor for a 200 - A service is: A) 6 AWG B) 4 AWG C) 2 AWG D) 1/0 AWG Answer: B Explanation: Table 250.66 lists 4 AWG copper for a 200-A service. Question 42. A dryer vent must be installed: A) Inside a wall cavity B) Through a fire-rated door without a damper
Electrician Ultimate Exam
C) Through a fire-rated wall with a fire-rated damper D) Directly into an attic space Answer: C Explanation: NEC 300.22 requires dryer exhaust to pass through a fire-rated wall with a fire-rated damper. Question 43. The maximum number of conductors permitted in a standard 3-in. PVC conduit without derating is: A) 6 B) 9 C) 12 D) 15 Answer: C Explanation: Table 310.15(B)(3)(a) allows up to 9 conductors for 3-in. PVC before derating; however, the maximum fill calculation typically permits 12 # conductors in 3-in. PVC, so answer C. Question 44. Which of the following devices must be GFCI protected in a commercial kitchen? A) Refrigeration units B) Walk-in cooler lighting C) Countertop receptacles D) Exhaust fans Answer: C Explanation: NEC 210.8(B) mandates GFCI protection for all receptacles serving countertop surfaces in commercial kitchens.
Electrician Ultimate Exam
D) 12 in. Answer: C Explanation: NEC 422.13 requires a minimum 6-in. clearance from the sides and top of a water heater to combustible material. Question 48. A conduit run that passes through a fire-rated wall must be: A) Sealed with fire-stop mortar B) Left open for ventilation C) Protected with a metal plate only D) Not required to be sealed if the conduit is PVC Answer: A Explanation: NEC 300.22 requires fire-stopping of any penetration through fire-rated assemblies. Question 49. The required ampacity for a feeder supplying a 30-A branch circuit with four current-carrying conductors in a 30 °C ambient is: A) 30 A B) 35 A C) 40 A D) 45 A Answer: B Explanation: With four conductors, apply a 0.94 adjustment factor (Table 310.15(B) (3)(a)). 30 A ÷ 0.94 ≈ 31.9 A; the next standard size is 35 A. Question 50. When installing a receptacle in a wet location outdoors, the enclosure must be:
Electrician Ultimate Exam
A) Weather-proof (NEMA 3R) B) Dry-type only C) Any standard box D) Metal only Answer: A Explanation: NEC 406.9(A) requires outdoor wet-location receptacles to be installed in weather-proof enclosures. Question 51. The permissible voltage for a Class II, Division 1 hazardous location is limited to: A) 30 V B) 50 V C) 120 V D) 240 V Answer: B Explanation: NEC 500.6 limits Class II hazardous locations to systems not exceeding 50 V. Question 52. The minimum size of a copper conductor for a 100-ft run feeding a 15 - A lighting circuit, using 75 °C insulation, is: A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: B
