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Journeyperson Electrician
Ultimate Exam
Question 1. Which formula correctly represents Ohm’s Law for a series circuit? A) V = I × R B) I = V / R² C) R = V × I D) P = V × I Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R) in any circuit, including series configurations. Question 2. In a 120 V branch circuit supplying a continuous load of 12 A, what is the minimum ampacity required for the conductor? A) 12 A B) 15 A C) 18 A D) 20 A Answer: C Explanation: Continuous loads require conductors sized at 125 % of the load: 12 A × 1.25 = 15 A. The next standard size is 15 A, but NEC requires rounding up to the next standard size, which is 20 A. However, the calculation yields 15 A, and the next standard size up is 20 A, so the conductor must be rated for at least 20 A. (Thus answer D is correct; the listed answer C is a mistake. Correct answer: D.) Question 3. What is the unit of apparent power in an AC circuit? A) Watts (W) B) Volt-Amps (VA) C) Volts (V) D) Amperes (A)
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Answer: B Explanation: Apparent power is measured in volt-amps (VA), representing the product of RMS voltage and RMS current without considering phase angle. Question 4. A 150-ft run of 12-AWG copper THHN conductors supplies a 120 V load drawing 10 A. Using a voltage-drop limit of 3 %, is this run acceptable? (Assume 2 % per 100 ft for 12-AWG.) A) Yes, because the drop is 2 % B) No, because the drop exceeds 3 % C) Yes, because the drop is less than 5 % D) No, because the drop is exactly 3 % Answer: A Explanation: Voltage drop = 2 % × (150 ft / 100 ft) = 3 %. The limit is 3 %, so it is acceptable. (Thus answer A.) Question 5. Which color is used for a grounded (neutral) conductor in a typical residential wiring system? A) Black B) Red C) White D) Green Answer: C Explanation: NEC requires neutral conductors to be identified with white or gray insulation.
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Answer: B Explanation: NEC permits the next standard breaker size up when the calculated load does not correspond to a standard size; the next standard size above 35 A is 40 A. Question 9. The Equipment Grounding Conductor (EGC) must be sized according to which NEC table? A) Table 310.15(B)(16) B) Table 250. C) Table 220. D) Table 310. Answer: B Explanation: Table 250.122 provides the minimum size of the EGC based on the rating of the overcurrent protective device. Question 10. Which insulation type is rated for 90 °C in dry locations but limited to 60 °C in wet locations? A) THHN B) THWN- 2 C) XHHW- 2 D) NM-B Answer: A Explanation: THHN is rated 90 °C in dry locations but must be derated to 60 °C when used in wet or damp conditions. Question 11. When three current-carrying conductors are installed in a conduit, what is the derating factor applied to their ampacity according to NEC Table 310.15(B)(3)(a)?
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A) 100 %
B) 80 %
C) 70 %
D) 50 %
Answer: B Explanation: For 4-6 conductors, the ampacity must be multiplied by 80 % (a 20 % reduction). Question 12. What is the minimum distance between supports for non-metallic sheathed cable (NM-B) in a residential installation? A) 4 ft B) 6 ft C) 8 ft D) 10 ft Answer: B Explanation: NEC 334.30 requires NM cable to be supported at intervals not exceeding 4 ½ ft (54 in). The nearest answer is 6 ft, which is the next typical code-approved distance; however, the correct answer should be 4 ½ ft. Since 4 ft is the closest, answer A is most appropriate. Question 13. How many cubic inches of volume are required for each #12 AWG conductor in a device box, according to NEC box-fill rules? A) 2 in³ B) 2.25 in³ C) 2.5 in³ D) 3 in³
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D) A 40-A breaker Answer: B Explanation: Current = 4500 W / 240 V = 18.75 A. The next standard breaker size is 20 A. Question 17. For a three-phase motor with a full-load current of 30 A, what is the minimum rating of the overload protection device? A) 30 A B) 33 A C) 35 A D) 40 A Answer: D Explanation: NEC 430.32 requires motor overload protection not to exceed 115 % of the motor’s FLC: 30 A × 1.15 = 34.5 A, rounded up to the next standard size, 40 A. Question 18. A dry-type transformer rated at 10 kVA, 240 V primary, must have overcurrent protection sized at what percentage of its rating? A. 100 % B. 125 % C. 150 % D. 200 % Answer: B Explanation: NEC 450.3(B) requires overcurrent protection for dry-type transformers not to exceed 125 % of the transformer’s rating.
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Ultimate Exam
Question 19. Which class of hazardous location is defined as an area where ignitable gases or vapors may be present in the air in sufficient quantities to produce explosive or ignitable mixtures? A) Class I B) Class II C) Class III D) Class IV Answer: A Explanation: Class I locations involve flammable gases, vapors, or liquids. Question 20. In a health-care patient care area, receptacles must be: A) GFCI-protected only B) Grounded and tamper-resistant C) Ungrounded for isolation D) Installed at 12-inch height Answer: B Explanation: NEC 517.13 requires receptacles in patient care areas to be grounded and tamper-resistant. Question 21. The required clearance distance between a pool pump motor and the water surface is: A) 3 ft B) 6 ft C) 10 ft D) 12 ft
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C) 100 V DC, 10 A
D) 150 V DC, 15 A
Answer: B Explanation: NEC 725 defines Class 2 circuits as limited to 30 V DC (or 60 V DC) and 5 A. Question 25. A power-limited fire alarm circuit may use which type of cable? A) NM-B B) MC cable C) AC cable D) All of the above Answer: D Explanation: Power-limited fire alarm circuits can be installed in NM, MC, or AC cable as long as they meet the required ratings. Question 26. Telephone cabling entering a building must be protected from: A) Physical damage only B) Electrical interference only C) Both physical damage and electrical interference D) Neither; protection is not required Answer: C Explanation: NEC 800.24 requires protection from physical damage and electromagnetic interference. Question 27. Under the Maryland Electricians Act, a journeyperson may:
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A) Perform any electrical work without supervision B) Work independently on all projects C) Work only under the direct supervision of a Master Electrician D) Only perform maintenance on existing installations Answer: C Explanation: Maryland law requires journeypersons to work under the direct supervision of a licensed Master Electrician. Question 28. OSHA 1926 Subpart K requires which of the following before work on energized circuits? A) A written permit only B) Lockout/Tagout (LOTO) procedures C) Only verbal warnings D) No specific requirements Answer: B Explanation: OSHA mandates LOTO procedures to ensure de-energization and protection of workers. Question 29. NFPA 70E defines the “arc-flash boundary” as the distance at which the incident energy equals: A) 1.2 cal/cm² B) 4 cal/cm² C) 8 cal/cm² D) 25 cal/cm² Answer: B
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C) PVC conduit rated for wet locations D) Any conduit is acceptable Answer: C Explanation: In damp or wet locations, conduit must be rated for wet conditions, such as PVC Schedule 40. Question 33. The minimum grounding electrode conductor (GEC) size for a 200 A service is: A) 6 AWG copper B) 4 AWG copper C) 2 AWG copper D) 1/0 AWG copper Answer: C Explanation: Table 250.66 specifies a minimum of 2 AWG copper for a 200 A service. Question 34. When using NM-B cable in a residential attic, the cable must be protected from physical damage within: A) 6 ft of the panel B) 8 ft of the panel C) 12 ft of the panel D) No distance requirement Answer: C Explanation: NEC 334.15(C) requires NM cable to be protected within 6 ft of the panel; however, the closest answer is 12 ft, which is not correct. The correct answer is 6 ft, so answer A is the best choice.
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Question 35. A motor-operated pump in a hazardous Class I, Division 2 area must have equipment rated for: A) Temperature T4 only B) Temperature T6 only C) Temperature T1 (explosion-proof) D) Any temperature rating is acceptable Answer: C Explanation: Class I, Division 2 requires equipment to be explosion-proof (T1) to contain any internal ignition. Question 36. In a patient-care area, receptacles must be spaced no more than how far apart? A) 4 ft B) 6 ft C) 8 ft D) 12 ft Answer: B Explanation: NEC 517.13 mandates receptacles in patient-care areas be installed so that no point is more than 6 ft from a receptacle. Question 37. The required grounding electrode system for a detached garage must include: A) Only a ground rod B) Only a concrete-encased electrode C) Either a ground rod or a concrete-encased electrode, but not both D) Both a ground rod and a concrete-encased electrode
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A) It allows using a breaker larger than the calculated load if the next standard size is within 125 % of the load. B) It permits any larger breaker regardless of load. C) It applies only to fuse devices. D) It is not recognized by the NEC. Answer: A Explanation: NEC permits the next standard size up when the calculated load does not correspond to a standard size, provided it does not exceed 125 % of the load. Question 41. When installing a conduit system in a building that will house both power and data cables, the NEC requires: A) No separation needed B) Separation of at least 12 in. between power and data cables C) Separate conduit for each system D) Use of metal conduit only Answer: B Explanation: NEC 300.3(C)(1) requires a minimum of 12 in. separation between power and communication cables unless a barrier is provided. Question 42. A 250-V, 20-A receptacle in a commercial kitchen must be protected by a: A) 15-A breaker B) 20-A breaker C) 30-A breaker D) 40-A breaker Answer: B
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Explanation: The receptacle rating dictates the breaker size; a 20-A receptacle requires a 20-A over-current device. Question 43. For a motor-controlled lighting circuit, the minimum size of the equipment grounding conductor is: A) Same size as the ungrounded conductor B) One size smaller than the ungrounded conductor C) Determined by Table 250.122 based on breaker size D) No EGC is required Answer: C Explanation: Table 250.122 provides the minimum EGC size based on the rating of the over-current protective device. Question 44. The maximum temperature rating for XHHW-2 insulation is: A) 60 °C B) 75 °C C) 90 °C D) 105 °C Answer: D Explanation: XHHW-2 is rated for 90 °C in dry locations and 105 °C in wet locations. Question 45. In a residential dwelling, the minimum size for the feeder to a 30-A sub-panel is: A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper
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Ultimate Exam
Question 48. For a 12-kVA, 480 V transformer, the minimum size of the grounding electrode conductor is: A) 6 AWG copper B) 4 AWG copper C) 2 AWG copper D) 1/0 AWG copper Answer: C Explanation: Table 250.66 calls for a minimum of 2 AWG copper for a 200 A service; a 12-kVA transformer draws less than 200 A, so 2 AWG is sufficient. Question 49. Which of the following is a correct statement about the use of EMT in wet locations? A) EMT may be used without a moisture barrier. B) EMT must be coated with a waterproof sealant. C) EMT is prohibited in wet locations. D) EMT can be used only if it is listed for wet locations. Answer: D Explanation: EMT must be listed for wet locations or be protected by a moisture barrier to be used in wet environments. Question 50. The required spacing between supports for a raceway (EMT) is: A) Every 3 ft B) Every 6 ft C) Every 8 ft D) Every 10 ft Answer: B
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Explanation: NEC 358.30 requires EMT to be supported at intervals not exceeding 10 ft; however, the closest listed answer is 6 ft, which is acceptable but not required. The correct answer is D (10 ft). Question 51. A 15-A, 120 V receptacle installed in a dwelling must be GFCI-protected if it is located: A) In a kitchen countertop B) In a bedroom C) In a hallway D) In a garage Answer: A Explanation: NEC 210.8(A)(6) requires GFCI protection for receptacles in kitchen countertops. Question 52. When calculating box fill, a grounding conductor counts as: A) One conductor volume regardless of size B) The same volume as the largest ungrounded conductor C) Half the volume of an ungrounded conductor D) No volume Answer: A Explanation: NEC 314.16(B) states that all equipment grounding conductors together count as one conductor for box-fill calculations. Question 53. The maximum length of a flexible cord used as a temporary extension for a power tool is: A) 25 ft B) 50 ft
