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Electrician Ultimate Exam
Question 1. Which NEC article defines the term “grounded conductor”? A) Article 100 B) Article 110 C) Article 250 D) Article 300 Answer: A Explanation: Article 100 contains definitions for NEC terminology, including “grounded conductor.” Question 2. Ohm’s Law states that voltage equals: A) Current divided by resistance B) Current multiplied by resistance C) Resistance divided by current D) Power multiplied by current Answer: B Explanation: V = I × R; voltage is the product of current and resistance. Question 3. A 120 V, 15 A circuit has a total resistance of: A) 8 Ω B) 0.125 Ω C) 15 Ω D) 120 Ω Answer: A Explanation: R = V / I = 120 V / 15 A = 8 Ω. Question 4. In a parallel circuit, the total current is: A) The sum of the branch currents B) The same as the branch current C) The product of branch voltages
Electrician Ultimate Exam
D) Half of the source current Answer: A Explanation: Parallel branches each receive the same voltage; total current is the sum of each branch’s current. Question 5. When reading a one-line diagram, the symbol “⎕” most commonly represents: A) A transformer B) A circuit breaker C) A disconnect switch D) A receptacle Answer: B Explanation: The rectangular box with a line through it denotes a circuit breaker. Question 6. The general lighting load for a dwelling unit is calculated as: A) 3 VA per square foot of floor area B) 1 VA per square foot of floor area C) 5 VA per square foot of floor area D) 2 VA per square foot of floor area Answer: A Explanation: NEC 220.12 requires 3 VA per ft² for general lighting in dwellings. Question 7. The minimum clearance from a service drop to a building opening is: A) 5 ft B) 10 ft C) 12 ft D) 8 ft Answer: B Explanation: NEC 230.24 requires at least 10 ft clearance to any opening.
Electrician Ultimate Exam
A) 12 ft long, ½ in. diameter B) 20 ft long, ¼ in. diameter C) 4 ft long, 1 in. diameter D) 10 ft long, ¾ in. diameter Answer: A Explanation: NEC 250.52(A)(3) requires a minimum of 20 ft of #4 rebar (½ in. dia.) or 12 ft of #4 copper. Question 12. When bonding a metal water pipe, the connection must be within ___ ft of the service disconnect: A) 5 ft B) 10 ft C) 15 ft D) 20 ft Answer: B Explanation: NEC 250.104(A)(1) requires bonding within 5 ft of the service disconnect; the pipe must be within 5 ft of the point where it enters the building, effectively limiting the distance to 5 ft. Question 13. A transformer feeding a 240 V load must have its primary overcurrent protection sized at least: A) 125 % of the primary full-load current B) 100 % of the primary full-load current C) 150 % of the primary full-load current D) 110 % of the primary full-load current Answer: A Explanation: NEC 450.3(B) requires primary OCPD to be not less than 125 % of the transformer’s primary full-load current. Question 14. The minimum size of feeder conductors supplying a 30 A branch circuit to a kitchen countertop receptacle is:
Electrician Ultimate Exam
A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: A Explanation: A 30 A branch circuit requires at least 10 AWG copper, but the feeder can be sized to the load; 12 AWG is insufficient, so 10 AWG is the minimum. Question 15. For a branch circuit supplying a 1200-W electric dryer, the required breaker size is: A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: 1200 W ÷ 120 V = 10 A. NEC requires a breaker not less than 125 % of continuous load, so 12.5 A → next standard size 20 A. Question 16. Voltage drop should not exceed ___% for feeder runs serving sensitive electronic equipment. A) 2 % B) 3 % C) 5 % D) 10 % Answer: B Explanation: NEC recommends a maximum of 3 % voltage drop for feeders serving sensitive equipment. Question 17. Which of the following locations requires GFCI protection for a 120 - V, 20-A receptacle? A) A finished basement
Electrician Ultimate Exam
D) 0.
Answer: C Explanation: NEC Table 310.15(B)(3)(a) gives a 0.80 factor for 4-6 conductors; however, for 4 conductors the factor is 0.80. (Correct answer: A). Answer: A Explanation: The derating factor for 4-6 conductors is 0.80. Question 21. The maximum fill for a ¾-in. EMT conduit containing #12 THHN conductors is: A) 40 % B) 35 % C) 30 % D) 25 % Answer: A Explanation: NEC Chapter 9 Table 1 permits 40 % fill for more than two conductors in EMT. Question 22. How many #12 THHN conductors may be installed in a ¾-in. EMT while staying within the 40 % fill limit? A) 5 B) 6 C) 7 D) 8 Answer: C Explanation: Each #12 THHN occupies 0.013 in²; 40 % of 0.824 in² (EMT area) ≈ 0.33 in², allowing 25 conductors, but the NEC limits to 7 for practical reasons. (Correct answer: C). Question 23. The volume allowance for a device in a junction box (per conductor) is: A) 1 in³ for each insulated conductor
Electrician Ultimate Exam
B) 2 in³ for each insulated conductor C) 1.5 in³ for each insulated conductor D) 2.5 in³ for each insulated conductor Answer: A Explanation: NEC 314.16(B) assigns 1 in³ per insulated conductor. Question 24. A 12-in. long NM-B cable must be secured within how many inches of a box? A) 4 in. B) 6 in. C) 8 in. D) 12 in. Answer: B Explanation: NEC 334.30 requires NM cable to be secured within 6 in. of a box. Question 25. The maximum distance between supports for MC cable is: A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: C Explanation: NEC 330.30 permits MC cable to be supported at intervals not exceeding 8 ft. Question 26. Which conduit type may be installed in a wet location without a moisture barrier? A) Rigid metal conduit (RMC) B) PVC conduit C) EMT D) Flexible metal conduit (FMC)
Electrician Ultimate Exam
Explanation: 4500 W ÷ 240 V = 18.75 A; applying 125 % → 23.4 A → next standard size 30 A. Question 30. When sizing a branch circuit for a 1500-W kitchen range (120 V), the required breaker size is: A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: 1500 W ÷ 120 V = 12.5 A; 125 % → 15.6 A → next standard size 20 A. Question 31. The full-load amps (FLA) of a 1-hp single-phase motor (115 V) is approximately: A) 8 A B) 10 A C) 12 A D) 15 A Answer: B Explanation: NEC Table 430.247 shows about 10 A FLA for a 1-hp motor at 115 V. Question 32. For a motor-protected circuit, the overload protection must be set at: A) 100 % of FLA B) 115 % of FLA C) 125 % of FLA D) 150 % of FLA Answer: C Explanation: NEC 430.32 requires overload protection not to exceed 125 % of the motor’s FLA.
Electrician Ultimate Exam
Question 33. The minimum disconnect rating for a 5-ton, 240-V air-conditioner with a name-plate current of 22 A is: A) 30 A B) 40 A C) 50 A D) 60 A Answer: B Explanation: The disconnect must be at least 125 % of the name-plate current: 22 A × 1.25 = 27.5 A → next standard size 40 A. Question 34. In a hazardous (Class I) location, electrical equipment must be installed in: A) Explosion-proof enclosures B) Wet-location boxes only C) Standard metal boxes D) Plastic conduit only Answer: A Explanation: Class I areas require equipment rated for explosion protection. Question 35. For patient care areas in health-care facilities, the required grounding conductor size is: A) Same as residential (minimum #8 Cu) B) Minimum #6 Cu regardless of load C) Determined by the equipment grounding conductor size D) No grounding required Answer: C Explanation: NEC 517.13 requires grounding based on the equipment grounding conductor of the circuits serving patient care areas.
Electrician Ultimate Exam
C) 20 VA per device D) 30 VA per device Answer: C Explanation: NEC 760.41 requires at least 20 VA per device on the fire-alarm power source. Question 40. OSHA 1926 requires fall protection when working at heights greater than: A 4 ft B 6 ft C 8 ft D 10 ft Answer: B Explanation: OSHA construction standards mandate fall protection at heights of 6 ft or more. Question 41. The LOTO procedure requires that the energy-isolating device be: A) Tagged only B) Locked only C) Both locked and tagged D) Neither, just turned off Answer: C Explanation: Lockout/tagout requires both a lock and a tag to prevent re-energization. Question 42. A permit is required for which of the following electrical work in Kansas? A) New residential wiring B) Replacing a single receptacle C) Installing a ceiling fan
Electrician Ultimate Exam
D) All of the above Answer: A Explanation: Kansas State requires a permit for new installations; minor repairs may be exempt. Question 43. The NEC definition of “accessible” means: A) Capable of being reached without tools B) Capable of being reached with tools C) Capable of being reached without removing any part of a building D) Capable of being reached only by qualified personnel Answer: C Explanation: “Accessible” means reachable without removing building parts or finishing. Question 44. The maximum number of conductors allowed in a ½-in. PVC conduit for #14 AWG THHN is: A) 9 B) 12 C) 15 D) 18 Answer: B Explanation: Using Table 1, ½-in. PVC has 0.304 in² area; #14 AWG THHN occupies 0.013 in² each; 40 % fill allows 9 conductors, but the NEC permits up to 12 for small conductors; correct answer is 12. Question 45. When a feeder supplies more than three current-carrying conductors, the temperature correction factor for 30 °C ambient temperature is: A) 1. B) 0. C) 0. D) 0.
Electrician Ultimate Exam
Question 49. In a commercial building, the demand factor for a lighting load is: A) 100 % B) 80 % C) 70 % D) 60 % Answer: B Explanation: NEC 220.42 permits a 80 % demand factor for commercial lighting loads. Question 50. The minimum conduit fill for a single conductor (i.e., one wire) is: A) 53 % B) 40 % C) 31 % D) 25 % Answer: A Explanation: NEC Chapter 9 Table 1 allows 53 % fill for a single conductor. Question 51. A 120-V, 20-A receptacle in a garage must be protected by a GFCI device located: A) At the receptacle only B) At the panel only C) Either at the receptacle or at any point upstream D) No GFCI required Answer: C Explanation: NEC 210.8(A)(2) allows GFCI protection at any point in the circuit. Question 52. The required ampacity of a feeder supplying a 50-A dryer, a 30-A range, and a 20-A dishwasher (all 240 V) is:
Electrician Ultimate Exam
A) 100 A
B) 120 A
C) 150 A
D) 200 A
Answer: B Explanation: Sum of loads = 100 A; applying 125 % for continuous loads (none are continuous) → 100 A, next standard size 120 A. Question 53. The grounding-electrode system must be bonded to which of the following? A) The service equipment only B) The neutral only C) Both service equipment and neutral D) Neither, they remain separate Answer: C Explanation: NEC 250.24(A)(1) requires bonding of the grounding-electrode system to the service equipment and the neutral. Question 54. For a 240-V, 20-A circuit feeding an electric range, the required conduit fill for three #10 AWG THHN conductors is: A) 40 % fill of ¾-in. EMT B) 40 % fill of ½-in. EMT C) 53 % fill of ¾-in. EMT D) 31 % fill of ½-in. EMT Answer: A Explanation: Three #10 AWG THHN in ¾-in. EMT meet the 40 % fill requirement. Question 55. Which of the following is a permissible method for grounding a metal conduit system? A) Using a grounding clamp at each junction
Electrician Ultimate Exam
B) 4/0 AWG Al C) 250 kcmil Al D) 350 kcmil Al Answer: C Explanation: Table 250.66 lists 250 kcmil aluminum for a 600-A service. Question 59. A 120-V, 15-A receptacle installed in a damp location must be: A) GFCI protected only B) Weather-proof (in-use) type only C) Both GFCI protected and weather-proof (in-use) D) Neither required Answer: C Explanation: NEC 406.9(B) requires damp-location receptacles to be weather-proof and GFCI protected. Question 60. The maximum length of a flexible metal conduit (FMC) run without a support is: A) 3 ft B) 4 ft C) 5 ft D) 6 ft Answer: B Explanation: NEC 376.30 permits FMC to be unsupported for up to 4 ft. Question 61. The minimum conduit size for a 4-wire 120/240-V feeder consisting of three #2 AWG copper conductors and one #8 AWG grounding conductor is: A) 1-in. EMT B) ¾-in. EMT C) 1-½-in. EMT
Electrician Ultimate Exam
D) 2-in. EMT Answer: A Explanation: The area of three #2 AWG plus a #8 AWG exceeds the 40 % fill capacity of ¾-in. EMT; 1-in. EMT is required. Question 62. According to NEC, a “dedicated” circuit for a single appliance must be sized at: A) Exactly the appliance’s name-plate current B) 125 % of the appliance’s name-plate current C) 150 % of the appliance’s name-plate current D) 200 % of the appliance’s name-plate current Answer: B Explanation: NEC 210.23(A) requires dedicated circuits to be sized at least 125 % of the appliance’s name-plate rating. Question 63. A 30-amp receptacle in a commercial kitchen must be supplied by a circuit protected at: A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: NEC 210.23(B) requires the OCPD to be at least 125 % of the receptacle rating; 30 A × 1.25 = 37.5 A → 40 A breaker. Question 64. The required ampacity for a 3-phase, 4-wire feeder supplying a 20 - kW motor (460 V) is: A) 30 A B) 35 A C) 40 A
