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Journeyman Electrician 2020
Ultimate Exam
Question 1. Which formula correctly represents Ohm’s Law? A) P = I × V B) V = I × R C) I = V ÷ P D) R = V × I Answer: B Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. In a purely resistive series circuit, the total resistance is: A) The sum of all individual resistances B) The product of all individual resistances C) The reciprocal of the sum of reciprocals D) Always 0 Ω Answer: A Explanation: Series resistances add directly: R_total = R1 + R2 + …. Question 3. Which NEC definition describes a “Qualified Person”? A) Anyone who can read a wiring diagram B) A person trained and experienced in the construction and operation of electrical equipment and installations C) Only a licensed electrician D) Anyone who has passed a written test Answer: B Explanation: A Qualified Person has the knowledge and skills to perform safe electrical work. Question 4. According to NEC Article 110, the working space in front of equipment must be at least:**
Journeyman Electrician 2020
Ultimate Exam
A) 24 in. wide, 30 in. deep, and 6 ft. high B) 30 in. wide, 36 in. deep, and 6 ½ ft. high C) 30 in. wide, 36 in. deep, and 6 ½ ft. high, measured from the floor to the height of the equipment D) None of the above Answer: C Explanation: NEC 110.26 requires a minimum width of 30 in., depth of 36 in., and height of 6 ½ ft. measured from the floor. Question 5. The maximum voltage drop allowed for a feeder supplying a continuous load 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 combined. Question 6. In a residential branch circuit, the ungrounded (hot) conductor must be identified by:** A) A white or gray color B) A green or bare color C) A black, red, or other non-white, non-gray color D) Any color is acceptable Answer: C Explanation: Ungrounded conductors are identified by colors other than white, gray, green, or bare.
Journeyman Electrician 2020
Ultimate Exam
Question 10. For a service entrance with a 200-A main breaker, the minimum size of the service-entrance conductors (copper) is:** A) 2/0 AWG B) 4/0 AWG C) 3/0 AWG D) 1/0 AWG Answer: C Explanation: NEC Table 310.15(B)(16) indicates 3/0 AWG copper is rated for 200 A at 75 °C. Question 11. When calculating the general lighting load for a dwelling unit, the NEC requires:** 3 VA per square foot of the floor area. Answer: A Explanation: NEC 220.12 uses 3 VA per ft² for general lighting loads in dwellings. Question 12. The demand factor for the first 10 kW of cooking appliances is:** A) 100 % B) 80 % C) 70 % D) 55 % Answer: B Explanation: NEC 220.55 specifies an 80 % demand factor for the first 10 kW of cooking loads. Question 13. Which grounding electrode is NOT permitted by the NEC? A) Ufer (concrete-encased) electrode
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Ultimate Exam
B) Grounding-ring electrode C) Metallic water pipe not in contact with the earth for at least 5 ft D) Ground-rod electrode of at least 8 ft length Answer: C Explanation: A grounding electrode must be in direct contact with earth; a pipe not buried for 5 ft does not qualify. Question 14. The minimum size of an equipment grounding conductor for a 20-A circuit protected by a 20-A breaker is:** A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 14 AWG copper Answer: D Explanation: Table 250.122 shows 14 AWG copper is adequate for a 20-A overcurrent device. Question 15. Bonding of the metal water piping system to the service equipment must be performed at:** A) Only at the service disconnecting means B) Every 10 ft of pipe C) Only at the water heater D) Only at the point where the pipe enters the building Answer: A Explanation: NEC 250.104(A) requires bonding of the water piping system at the service equipment. Question 16. The ampacity adjustment factor for three current-carrying conductors in a conduit at 30 °C ambient temperature is:**
Journeyman Electrician 2020
Ultimate Exam
A) ½ in. EMT B) ¾ in. EMT C) 1 in. EMT D) 1¼ in. EMT Answer: B Explanation: Using Table 5, three 4-AWG THHN require at least ¾ in. EMT to stay within 40 % fill. Question 20. Which type of raceway is permitted for outdoor wet locations? A) EMT only B) RMC only C) PVC conduit only D) Both B and C Answer: D Explanation: Rigid Metal Conduit (RMC) and PVC conduit are both approved for wet locations. Question 21. The required box fill for a device box containing a single-pole switch, 2 hott conductors, a neutral, and a grounding conductor is:** A) 4 conductors B) 5 conductors C) 6 conductors D) 7 conductors Answer: B Explanation: Each ungrounded conductor counts as 1, the neutral as 1, and the equipment ground as 1 × 0.5 = 0.5, rounding up to a total of 4.5 → 5 conductors. Question 22. A flexible cord rated 13 A is used to supply a 12 A portable heater. The cord is:**
Journeyman Electrician 2020
Ultimate Exam
A) Undersized B) Adequate because it meets the load C) Over-rated and must be replaced with a 15 A cord D) Not permitted for continuous loads Answer: D Explanation: NEC 400.5 requires flexible cords to be sized at 125 % of continuous loads; 13 A is insufficient for a 12 A continuous load. Question 23. A luminaire installed in a closet must have a minimum clearance from the nearest combustible surface of:** A) 3 in. B) 6 in. C) 12 in. D) 18 in. Answer: B Explanation: NEC 410.116 requires a 6-in. clearance for luminaires in closets. Question 24. For a 240-V, 30-A dryer, the required overcurrent protection is:** A) 30 A single-pole breaker B) 30 A double-pole breaker C) 40 A double-pole breaker D) 25 A double-pole breaker Answer: B Explanation: Dryers require a 2-pole breaker sized to the appliance’s rating; a 30-A double-pole is correct. Question 25. The NEC requires a disconnecting means for a permanently installed motor of 30 hp or less. This disconnect must be located:**
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A) Class I, Division 1 B) Class II, Division 2 C) Class III, Division 1 D) Class I, Division 2 Answer: C Explanation: Class III locations involve dust or fibers that are not ignitable under normal conditions; intrinsically safe equipment is required. Question 29. In a healthcare facility, the minimum rating for an emergency-power branch circuit supplying life-support equipment is:** A) 20 A B) 30 A C) 40 A D) 50 A Answer: D Explanation: NEC 517.12 mandates a minimum of 50 A for emergency circuits serving life-support equipment. Question 30. For a swimming pool with a water depth greater than 6 ft, the required GFCI protection must be provided at:** A) The nearest breaker panel only B) The pool pump motor disconnect only C) Both the pump motor and the lighting circuits D) Only at the pool’s underwater lights Answer: C Explanation: NEC 680.22 requires GFCI protection for pool pump motors and for pool lighting circuits.
Journeyman Electrician 2020
Ultimate Exam
Question 31. The required distance between an emergency-lighting fixture and the nearest exit doorway is:** A) 3 ft B) 6 ft C) 9 ft D) 12 ft Answer: B Explanation: NEC 700.12 requires emergency lighting to be installed so that the illuminated area extends at least 6 ft beyond the exit doorway. Question 32. New Hampshire RSA 319-C defines a journeyman electrician as someone who:** A) Has completed an apprenticeship only B) Has passed the state licensing exam and holds a valid journeyman license C) Can work without supervision on any job site D) Is a licensed contractor only Answer: B Explanation: RSA 319-C specifies that a journeyman must be licensed after passing the state exam. Question 33. Under NH Board Rule Elec-101, the maximum number of apprentices a journeyman may supervise on a residential job is:** A) 1 B) 2 C) 3 D) 4 Answer: B Explanation: NH Board Rule Elec-101 limits supervision to two apprentices per journeyman on residential projects.
Journeyman Electrician 2020
Ultimate Exam
Question 37. When installing a feeder in a raceway that contains five current-carrying conductors, the ampacity must be multiplied by the appropriate derating factor from Table 310.15(B)(3)(a). At 30 °C ambient temperature, the factor is:** A) 100 % B) 80 % C) 70 % D) 65 % Answer: B Explanation: For 4-6 conductors, the derating factor at 30 °C is 80 %. Question 38. The NEC permits the use of a 6-mm² copper grounding-electrode conductor for a residential service. This size is equivalent to which AWG size? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: 6 mm² copper is approximately #6 AWG. Question 39. For a 125-V, 15-A receptacle circuit supplying a home office, the required minimum number of receptacles per 180 sq ft of floor area is:** A) 1 B) 2 C) 3 D) 4 Answer: B
Journeyman Electrician 2020
Ultimate Exam
Explanation: NEC 210.52(A)(1) requires one receptacle per 180 sq ft; a 360-sq ft office needs at least two. Question 40. A conduit run is installed in a location where the ambient temperature is 40 °C. The base ampacity of the conductors is 55 A. After applying the temperature correction factor (0.91), the adjusted ampacity is:** A) 50 A B) 49.5 A C) 55 A D) 60 A Answer: B Explanation: 55 A × 0.91 = 49.95 A, rounded down to 49.5 A. Question 41. Which of the following cable types is allowed to be installed in a residential attic without a fire-blocking barrier? A) NM-B (Romex) B) MC cable with interlocked metal armor C) AC cable D) All of the above Answer: D Explanation: All listed cable types are permitted in attics per NEC 334.23, 332.23, and 320.23 when installed per code. Question 42. The required spacing between a receptacle and a bathtub is:** A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: C
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Ultimate Exam
Answer: D Explanation: Many dryers use the neutral for controls, timer, or interior light; therefore it must be present. Question 46. For a 4-wire feeder supplying a 120/240-V panel, the grounding conductor must be sized based on:** A) The feeder’s ampacity only B) The largest ungrounded conductor size only C) The rating of the overcurrent device protecting the feeder D) Both A and C Answer: D Explanation: Table 250.122 bases the equipment grounding conductor size on the overcurrent device rating, which correlates with feeder ampacity. Question 47. The NEC requires a disconnecting means for a permanently installed water heater of 4.5 kW at 240 V. The required breaker size is:** A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: Current = 4,500 W ÷ 240 V = 18.75 A. The next standard breaker size is 20 A. Question 48. In a hazardous-location Class I, Division 2 area, the wiring method permitted is:** A) Standard NM cable B) Metallic conduit with conductors rated for the area C) Non-metallic raceway only
Journeyman Electrician 2020
Ultimate Exam
D) Any wiring method is allowed Answer: B Explanation: Division 2 locations allow the use of conduit with conductors rated for the hazardous classification. Question 49. An emergency generator supplying a building must be synchronized with the utility source. This requirement is found in:** A) NEC 700. B) NEC 700. C) NEC 702. D) NEC 710. Answer: C Explanation: NEC 702.4 deals with automatic transfer switches and synchronization of generators. Question 50. The minimum height for a receptacle installed in a kitchen countertop area is:** A) 12 in. above the countertop B) 15 in. above the countertop C) No minimum, but must be at least 15 in. above the floor D) No height requirement, only location matters Answer: D Explanation: NEC does not prescribe a minimum height for countertop receptacles; they must be installed so that the cord can reach the countertop. Question 51. The NEC requires that all outdoor receptacles serving a dwelling be protected by:** A) A 20-A breaker only B) A GFCI device
Journeyman Electrician 2020
Ultimate Exam
C) Prohibited, AFCI can only be used on 15-A circuits D) Only required if the circuit supplies a TV Answer: A Explanation: NEC 210.12(B) requires AFCI protection for bedroom circuits. Question 55. The maximum number of conductors allowed in a standard 4-in. EMT conduit, assuming 40 % fill, is:** A) 12 B) 14 C) 16 D) 18 Answer: B Explanation: Using Table 5 and 40 % fill, a 4-in. EMT can accommodate up to 14 # THHN conductors. Question 56. For a 120-V, 20-A receptacle circuit that supplies a continuously operating freezer, the minimum conductor size is:** A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B Explanation: Continuous loads require conductors sized at 125 % of the load; 20 A × 125 % = 25 A, which requires at least 12 AWG copper. Question 57. The NEC defines “accessible” as:** A) Capable of being reached without moving any obstacles B) Capable of being reached after removing a cover plate
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C) Capable of being reached without tools D) Capable of being reached only by qualified personnel Answer: A Explanation: “Accessible” means able to be reached without the use of tools or removing obstacles. Question 58. In a commercial parking garage, the required lighting level according to NEC is:** A) 5 foot-candles B) 10 foot-candles C) 20 foot-candles D) 30 foot-candles Answer: B Explanation: NEC 410.30(A) requires a minimum of 10 foot-candles for parking garages. Question 59. A metal-clad (MC) cable is installed in a wet location. The NEC permits this installation because:** A) MC cable is always rated for wet locations B) Only the armor must be stainless steel C) The cable must be listed for wet locations D) It is prohibited; only UF cable may be used Answer: C Explanation: MC cable can be used in wet locations only if it is listed for such use. Question 60. The required rating for a disconnecting means for a 3-phase, 30 - kW motor is:** A) 30 A B) 40 A
