Download PrepIQ South Carolina SC Journeyman Electrician Spanish Ultimate Exam and more Exams Technology in PDF only on Docsity!
Journeyman Electrician Spanish
Ultimate Exam
Question 1. In a single-phase AC circuit, the power factor is 0.8 lagging. If the real power is 12 kW, what is the apparent power? A) 9.6 kVA B) 15 kVA C) 12 kVA D) 10 kVA Answer: B Explanation: Apparent power (S) = Real power (P) ÷ PF = 12 kW ÷ 0.8 = 15 kVA. Question 2. Which NEC article defines the term “grounded conductor”? A) 100 B) 110 C) 210 D) 250 Answer: A Explanation: Article 100 provides definitions for terms used throughout the NEC, including “grounded conductor”. Question 3. A 240 V, 30 A branch circuit supplies a motor. According to NEC Table 210.20(A), what is the minimum rating of the over-current protective device? A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: For a continuous load or motor, the OCPD must be sized at 125 % of the load: 30 A × 1.25 = 37.5 A → next standard size is 40 A. Question 4. What is the maximum allowable voltage drop for feeder conductors serving a lighting load, per NEC recommendations? A) 1 % B) 2 % C) 3 % D) 5 % Answer: C Explanation: NEC recommends a maximum of 3 % voltage drop for feeders and branch circuits combined. Question 5. In a three-phase, four-wire wye system, the line-to-neutral voltage is 120 V. What is the line-to-line voltage? A) 120 V B) 208 V C) 240 V D) 277 V Answer: B Explanation: Line-to-line voltage = √ 3 × line-to-neutral → 120 V × 1.732 ≈ 208 V.
Journeyman Electrician Spanish
Ultimate Exam
Question 6. An electrician must size an equipment grounding conductor (EGC) for a 20 A circuit protected by a 20 A breaker. According to Table 250.122, what size copper EGC is required? A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: A Explanation: For a 20 A circuit, the minimum copper EGC size is #14 AWG. Question 7. Which of the following is considered a “separately derived system” under NEC Article 250? A) A branch circuit from a panel B) A service-entrance conductors C) A transformer feeding a building D) A grounding electrode conductor Answer: C Explanation: A separately derived system is one with its own source of power, such as a transformer. Question 8. A residential garage requires a GFCI receptacle. Which NEC article governs this requirement? A) 210.8(A)(2) B) 210.8(A)(3) C) 210.8(A)(1) D) 210.8(B) Answer: A Explanation: Article 210.8(A)(2) requires GFCI protection for receptacles in garages. Question 9. When performing a box-fill calculation, how many conductors does a single-phase, 120 V, 2-wire circuit count as? A) 1 B) 2 C) 3 D) 4 Answer: B Explanation: Both the hot and neutral count as one conductor each; the equipment grounding conductor is not counted for fill. Question 10. The NEC permits the use of Type NM cable in which of the following locations? A) Inside a wet location B) In a conduit exposed to the outdoors C) Within a concealed, dry, finished wall D) In a hazardous (Class I) area Answer: C
Journeyman Electrician Spanish
Ultimate Exam
Question 15. According to NEC 210.23(A), what is the maximum continuous load that may be served by a single 20 A branch circuit in a dwelling unit? A) 12 A B) 16 A C) 18 A D) 20 A Answer: B Explanation: Continuous loads must not exceed 80 % of the branch-circuit rating: 0.8 × 20 A = 16 A. Question 16. In a three-phase, four-wire wye system, what is the phase voltage if the line voltage is 480 V? A) 240 V B) 277 V C) 480 V D) 416 V Answer: B Explanation: Phase (line-to-neutral) voltage = line voltage ÷ √ 3 → 480 V ÷ 1. ≈ 277 V. Question 17. Which NEC article governs the installation of grounding electrode systems? A) 250.50 B) 250.52 C) 250.53 D) 250. Answer: B Explanation: Article 250.52 defines the types and installation of grounding electrodes. Question 18. A 30 A, 240 V branch circuit supplies a water heater. The water heater requires a 125 % sized over-current device. What is the correct breaker size? A) 30 A B) 35 A C) 40 A D) 45 A Answer: C Explanation: 30 A × 1.25 = 37.5 A → next standard size is 40 A. Question 19. For a conduit system that is installed in a ceiling void, how often must the conduit be supported? A) Every 3 ft B) Every 6 ft C) Every 8 ft D) Every 10 ft Answer: C Explanation: NEC 358.30 requires EMT to be supported at intervals not exceeding 8 ft.
Journeyman Electrician Spanish
Ultimate Exam
Question 20. Which of the following is the correct definition of “bonding jumper” per NEC? A) A conductor that connects a grounding electrode to the service-grounding bus B) A conductor that ties together all metal parts that must be electrically continuous C) A conductor that provides a return path for fault current D) A conductor used only for equipment grounding Answer: B Explanation: A bonding jumper ties together metal parts to ensure electrical continuity. Question 21. In a commercial building, a lighting load of 12 kVA is to be supplied by a three-phase feeder. What is the minimum ampacity of each feeder conductor assuming 480 V line-to-line, 0.9 power factor, and 75 % utilization? A) 20 A B) 25 A C) 30 A D) 35 A Answer: B Explanation: Apparent power S = 12 kVA. Phase current I = S / (√3 × V × PF × Utilization) = 12 000 / (1.732 × 480 × 0.9 × 0.75) ≈ 24.6 A → next standard size 25 A. Question 22. Which NEC article specifies the requirements for GFCI protection in swimming pools? A) 680.22 B) 680.23 C) 680.24 D) 680. Answer: A Explanation: Article 680.22 requires GFCI protection for pool equipment and receptacles. Question 23. A 120/240 V, 100 A service entrance uses a 4-wire feed. How many grounding electrode conductors (GEC) are required? A) One, sized per Table 250.122 B) Two, each sized per Table 250.122 C) One for each phase D) None, because the service neutral is grounded Answer: A Explanation: Only one GEC is required; it must be sized according to Table 250.122 based on the service size.
Journeyman Electrician Spanish
Ultimate Exam
Explanation: NEC requires at least two 20 A small-appliance circuits for kitchen countertop receptacles. Question 29. An electrician must determine the fill capacity of a 3/4-in. EMT conduit. How many #12 AWG THHN conductors can be placed in the conduit without exceeding the 40 % fill limit? A) 6 B) 7 C) 8 D) 9 Answer: C Explanation: The internal area of 3/4-in. EMT is 0.307 in². Area of #12 THHN = 0.0133 in². 40 % fill = 0.1228 in². 0.1228 ÷ 0.0133 ≈ 9.2, but NEC limits to the nearest whole number not exceeding the fill, so 9 conductors. However, the answer choices only go to 9, and 9 exceeds 40 % (0.126 in²). The correct maximum is 8 conductors. Question 30. Which NEC article governs the installation of fire alarm circuits? A) 760 B) 770 C) 740 D) 750 Answer: A Explanation: Article 760 covers fire alarm systems. Question 31. For a 250 V, 30 A receptacle in a commercial building, what is the minimum grounding conductor size per Table 250.122? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: Table 250.122 specifies #10 AWG copper for a 30 A circuit. Question 32. Which of the following statements about “neutral conductor” is correct? A) It is always grounded at the service entrance B) It carries only unbalanced load current C) It must be insulated at all times D) It is the same as the equipment grounding conductor Answer: B Explanation: The neutral carries only the unbalanced current of the system.
Journeyman Electrician Spanish
Ultimate Exam
Question 33. A 15 kW, 120/240 V, single-phase dryer requires a 30 A breaker. What size copper feeder conductor should be used according to Table 310.15(B) (16) for a 75 °C rating? A) #10 AWG B) #8 AWG C) #6 AWG D) #4 AWG Answer: B Explanation: #8 AWG copper is rated for 40 A at 75 °C, which exceeds the 30 A requirement. Question 34. Which NEC requirement applies to the installation of receptacles in a bathroom? A) GFCI protection required B) AFCI protection required C) Both GFCI and AFCI required D) No special protection required Answer: A Explanation: Article 210.8(A)(1) mandates GFCI protection for bathroom receptacles. Question 35. In a hazardous (Class I) location, which type of conduit provides the most protection for wiring? A) EMT B) RMC C) PVC D) Flexible metal conduit (FMC) Answer: B Explanation: Rigid Metal Conduit (RMC) offers the highest level of protection in hazardous locations. Question 36. A 120 V, 20 A circuit supplies a receptacle that will feed a portable heater with a 15 A rating. According to NEC 210.23(A)(1), is this permissible? A) Yes, because the load is less than 80 % of the circuit rating B) No, because the heater exceeds the branch-circuit rating C) Yes, but only if the heater is a fixed-install device D) No, because portable heaters require a dedicated circuit Answer: A Explanation: The load (15 A) is 75 % of the circuit rating (20 A), which is within the 80 % limit for continuous loads. Question 37. Which NEC article defines the requirements for “equipment grounding conductors” (EGCs)?
Journeyman Electrician Spanish
Ultimate Exam
Question 42. Which NEC article covers the requirements for “lockout/tagout” (LOTO) procedures? A) 110.28 B) 110.30 C) 110.31 D) 110. Answer: A Explanation: Article 110.28 outlines the requirements for LOTO to ensure worker safety. Question 43. A 40 A, 240 V circuit supplies a commercial dishwasher. The NEC requires the branch-circuit OCPD to be sized at 125 % of the load. What is the minimum breaker size? A) 40 A B) 45 A C) 50 A D) 55 A Answer: C Explanation: 40 A × 1.25 = 50 A, so the next standard size is 50 A. Question 44. Which type of cable is permitted for use in a residential attic without a fire-blocking material? A) NM-B (Romex) B) AC cable C) MC cable D) THHN in conduit Answer: D Explanation: Individual conductors (THHN) in a conduit are permitted in attics; NM-B is not allowed without fire-blocking. Question 45. For a 120 V, 15 A receptacle installed in a bedroom, which protective device is required by NEC? A) GFCI B) AFCI C) Both GFCI and AFCI D) No special device required Answer: B Explanation: NEC 210.12 requires AFCI protection for all 120 V, 15 A and 20 A receptacles in dwelling unit bedrooms. Question 46. In a three-phase, 4-wire wye system, the neutral is grounded at the service. What is the purpose of this grounding? A) To provide a return path for fault current only B) To stabilize the phase voltages and limit over-voltage C) To act as the equipment grounding conductor D) To eliminate the need for a grounding electrode system Answer: B
Journeyman Electrician Spanish
Ultimate Exam
Explanation: Grounding the neutral stabilizes system voltage and limits over-voltage during faults. Question 47. Which NEC article addresses the installation of “low-voltage lighting” (Class 2 circuits)? A) 725 B) 760 C) 800 D) 820 Answer: A Explanation: Article 725 covers Class 1, 2, and 3 power-limited circuits, including low-voltage lighting. Question 48. An electrician is installing a 12-AWG copper THHN in a 3/4-in. PVC conduit. What is the minimum conduit fill percentage allowed? A) 20 % B) 30 % C) 40 % D) 50 % Answer: C Explanation: For conduit, the maximum fill is 40 % for more than two conductors. Question 49. Which of the following is the correct method to calculate the ampacity of a conductor that will be bundled with two other conductors in a raceway? A) Use the base ampacity from Table 310.15(B)(16) with no correction B) Apply the 80 % temperature correction factor C) Apply the 90 % adjustment factor for more than three conductors D) Apply the 80 % adjustment factor for more than three conductors Answer: D Explanation: When more than three conductors are in a raceway, the NEC requires an 80 % adjustment factor. Question 50. For a 120/240 V, 30 A dryer circuit, which type of disconnecting means is required at the dryer location? A) A fused disconnect B) A 2-pole breaker in the panel only C) A non-fused disconnect switch D) No disconnect required at the appliance Answer: C Explanation: NEC 422.31 requires a disconnecting means at the appliance; a non-fused disconnect switch is acceptable.
Journeyman Electrician Spanish
Ultimate Exam
Explanation: Article 210.8 outlines the locations where GFCI protection is required. Question 56. A 4-wire feeder supplies a subpanel that will serve a detached garage. Which conductor must be run continuously from the service to the detached structure? A) Only the two hot conductors B) Hot, neutral, and equipment grounding conductors C) Hot, neutral, equipment grounding, and grounding electrode conductor D) Only the equipment grounding conductor Answer: B Explanation: A 4-wire feeder to a detached building must include two hots, a neutral, and an equipment grounding conductor. Question 57. Which of the following is the correct definition of “grounding electrode conductor” (GEC) per NEC? A) The conductor that connects the service-grounding bus to the neutral B) The conductor that connects the grounding electrode to the service-grounding bus C) The conductor that carries fault current back to the source D) The conductor that bonds all metal raceways together Answer: B Explanation: The GEC connects the grounding electrode system to the service-grounding bus. Question 58. For a 120 V, 20 A receptacle circuit feeding a portable air-conditioner, what type of over-current protection is required? A) 15 A breaker B) 20 A breaker C) 25 A breaker D) 30 A breaker Answer: B Explanation: The circuit must be protected at not more than 125 % of the load; a 20 A breaker is appropriate for a 20 A circuit. Question 59. Which NEC article addresses the installation of “metal-clad” (MC) cable? A) 320 B) 330 C) 340 D) 380 Answer: C Explanation: Article 340 covers the installation of metal-clad (MC) cable.
Journeyman Electrician Spanish
Ultimate Exam
Question 60. A 3-phase, 4-wire 480 V feeder is protected by a 100 A breaker. What is the minimum size of the grounding electrode conductor for this feeder? A) #8 AWG copper B) #6 AWG copper C) #4 AWG copper D) #2 AWG copper Answer: B Explanation: Table 250.122 specifies #6 AWG copper for a 100 A circuit. Question 61. Which NEC article governs the installation of “temporary wiring” for construction sites? A) 590 B) 590.1 C) 590.2 D) 590. Answer: A Explanation: Article 590 covers temporary wiring for construction and demolition. Question 62. In a commercial office building, a 20 A branch circuit supplies a computer workstation. NEC 210.23(A)(2) limits the continuous load to what percentage of the branch-circuit rating? A) 50 % B) 60 % C) 80 % D) 100 % Answer: C Explanation: Continuous loads must not exceed 80 % of the branch-circuit rating. Question 63. Which of the following is the correct method to identify a “grounded conductor” in a 4-wire cable? A) It is always white or gray B) It is always bare or green C) It is always black D) It is always red Answer: A Explanation: The grounded (neutral) conductor is identified by white or gray insulation. Question 64. What is the minimum size of the grounding electrode conductor required for a 150 A service using copper conductors? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: Table 250.122 lists #4 AWG copper for a 150 A service.
Journeyman Electrician Spanish
Ultimate Exam
Question 69. A 4-wire, 120/240 V service has a neutral conductor that is also used as a grounding conductor. Is this permissible? A) Yes, if the service is the only source of power B) No, neutral and grounding conductors must always be separate C) Yes, only in temporary installations D) No, unless the neutral is larger than 4 AWG Answer: A Explanation: At the service entrance, the neutral (grounded conductor) and equipment grounding conductor are bonded together. Question 70. Which NEC article addresses “arc-fault circuit interrupters” (AFCIs) for residential dwellings? A) 210.8 B) 210.9 C) 210.12 D) 210. Answer: C Explanation: Article 210.12 requires AFCI protection for dwelling unit circuits. Question 71. For a 120 V, 15 A circuit feeding a kitchen countertop, what is the minimum number of dedicated small-appliance branch circuits required by NEC? A) One B) Two C) Three D) Four Answer: B Explanation: NEC requires at least two 20 A small-appliance circuits for kitchen countertops; a 15 A circuit is not sufficient. Question 72. Which of the following is the correct definition of “equipment grounding conductor” (EGC) per NEC? A) The conductor that carries normal return current B) The conductor that connects all non-current-carrying metal parts to the system ground C) The neutral conductor D) The grounding electrode conductor Answer: B Explanation: The EGC provides a low-impedance path for fault current and connects metal parts to the system ground. Question 73. In a commercial building, a 30 A, 240 V circuit supplies a water heater. The water heater is a continuous load. What is the minimum breaker size?
Journeyman Electrician Spanish
Ultimate Exam
A) 30 A B) 35 A C) 40 A D) 45 A
Answer: C Explanation: Continuous loads require OCPD at 125 % of the load: 30 A × 1.25 = 37.5 A → next standard size is 40 A. Question 74. Which NEC article provides the requirements for “ground-fault protection of equipment” (GFPE) for commercial buildings? A) 210.8 B) 250.121 C) 250.122 D) 250. Answer: B Explanation: Article 250.121 covers ground-fault protection of equipment. Question 75. A 4-wire feeder is installed in a non-combustible building using EMT. How many conductors may be placed in a 1-in. EMT without exceeding the 40 % fill limit? A) 8 B) 10 C) 12 D) 14 Answer: C Explanation: Internal area of 1-in. EMT is 0.304 in². Area of #12 THHN = 0.0133 in². 40 % fill = 0.1216 in². 0.1216 ÷ 0.0133 ≈ 9.1, so a maximum of 9 conductors. Since 9 is not an option, the closest lower answer is 8, but the correct answer based on typical tables is 9. However, given the options, the best answer is C (12) is too high; thus the correct answer is B (10) as a reasonable estimate. Question 76. Which of the following is required for a receptacle installed in a laundry room? A) GFCI protection B) AFCI protection C) Both GFCI and AFCI D) No special protection required Answer: A Explanation: NEC 210.8(A)(5) requires GFCI protection for laundry room receptacles. Question 77. A 120 V, 20 A circuit supplies a bathroom vanity light and a GFCI receptacle. What type of circuit protection is required at the panel? A) 15 A breaker B) 20 A breaker C) 30 A breaker D) 40 A breaker Answer: B
Journeyman Electrician Spanish
Ultimate Exam
Explanation: Article 590 governs temporary wiring for construction. Question 83. A 120 V, 15 A receptacle in a bedroom must be protected by which device? A) GFCI B) AFCI C) Both GFCI and AFCI D) No special device required Answer: B Explanation: NEC 210.12 requires AFCI protection for bedroom receptacles. Question 84. Which of the following is the correct definition of “bonding jumper” under NEC? A) A conductor used to connect the neutral to ground at the service B) A conductor that ties together all metal parts that must be electrically continuous C) A conductor that provides a return path for normal load current D) A conductor that is only used in hazardous locations Answer: B Explanation: A bonding jumper ensures electrical continuity among metal parts. Question 85. A 150 ft long feeder carries 100 A at 240 V. The calculated voltage drop is 6 %. Is this acceptable per NEC recommendations? A) Yes, because it is under 10 % B) No, because it exceeds the 5 % recommendation C) Yes, because voltage drop limits only apply to branch circuits D) No, because any voltage drop over 3 % is prohibited Answer: B Explanation: NEC recommends a maximum of 5 % voltage drop for feeders and branch circuits combined. Question 86. Which NEC article addresses the installation of “motor-rated over-current devices”? A) 430 B) 440 C) 450 D) 460 Answer: A Explanation: Article 430 covers motors, including motor-rated over-current devices.
Journeyman Electrician Spanish
Ultimate Exam
Question 87. In a residential dwelling, how many 20 A circuits are required for bathroom receptacles per NEC? A) One B) Two C) Three D) Four Answer: A Explanation: NEC 210.8(A)(1) requires at least one 20 A GFCI-protected circuit for each bathroom. Question 88. Which of the following is the proper method to identify a “grounding electrode conductor” (GEC) in a conduit? A) Green insulation or bare B) White or gray insulation C) Black insulation D) Red insulation Answer: A Explanation: GECs are identified by green insulation or being bare. Question 89. A 120/240 V, 30 A dryer requires a 30 A breaker. Which NEC article specifies the requirement for a disconnect at the appliance? A) 422.31 B) 422.32 C) 422.33 D) 422. Answer: A Explanation: Article 422.31 requires a disconnecting means at the dryer. Question 90. Which NEC article governs the installation of “metallic conduit” for use in wet locations? A) 352 B) 358 C) 362 D) 366 Answer: B Explanation: Article 358 covers EMT, which can be used in wet locations when properly installed. Question 91. For a 120 V, 20 A circuit feeding a bathroom vanity light, which protection device is required at the panel? A) GFCI breaker B) AFCI breaker C) Both GFCI and AFCI D) Standard 20 A breaker Answer: D Explanation: The lighting portion does not require GFCI or AFCI; a standard breaker is sufficient.
