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Journeyman Electricians Certification Exam Prep
[MONATJE]
Question 1. Which OSHA standard specifically addresses electrical safety-related work practices? A) 1910. B) 1910. C) 1926. D) 1910. Answer: B Explanation: OSHA 1910.333 covers electrical safety‑related work practices for employees exposed to electrical hazards. Question 2. According to NFPA 70E, what is the minimum arc‑flash PPE required for a 1.2 cal/cm² incident energy level? A) Category 1 B) Category 2 C) Category 3 D) Category 4 Answer: B Explanation: Category 2 PPE is rated for incident energies from 1.2 to 4.0 cal/cm². Question 3. When performing a lockout/tagout on a three‑phase motor, how many lockout devices are required at minimum? A) 1 B) 2 C) 3 D) 4
Journeyman Electricians Certification Exam Prep
[MONATJE]
Answer: C Explanation: One lockout device must be placed on each of the three disconnecting means controlling the phases. Question 4. Which of the following ladder safety practices is required by OSHA? A) Use a ladder on a slippery surface if the angle is correct. B) Secure the top of the ladder on a stable surface. C) Stand on the top rung to reach higher. D) Use a ladder with a broken rung if no alternative exists. Answer: B Explanation: OSHA requires the top of a ladder to be secured on a firm, level surface to prevent slipping. Question 5. Ohm’s Law is expressed as V = I × R. If a circuit has 120 V and 10 A, what is the resistance? A) 8 Ω B) 10 Ω C) 12 Ω D) 120 Ω Answer: C Explanation: R = V / I = 120 V / 10 A = 12 Ω. Question 6. What is the power consumption of a 240‑V load drawing 15 A? A) 1.6 kW B) 2.4 kW
Journeyman Electricians Certification Exam Prep
[MONATJE]
B) AC reverses polarity periodically; DC flows in one direction. C) AC is used only for lighting; DC only for motors. D) AC cannot be transformed; DC can. Answer: B Explanation: Alternating current periodically reverses polarity, whereas direct current flows in a single direction. Question 10. NEC Article 100 defines “accessible.” Which description best fits the term? A) Capable of being reached without removing any part of a building. B) Capable of being reached without using tools. C) Capable of being reached without damaging the equipment. D) Capable of being reached without using a ladder. Answer: C Explanation: “Accessible” means capable of being reached for operation, maintenance, or inspection without damaging the equipment or the building. Question 11. What is the minimum working space width in front of a panelboard rated 600 A according to NEC 110.26? A) 30 in. B) 36 in. C) 42 in. D) 48 in. Answer: C Explanation: The required width equals the width of the equipment or 30 in., whichever is greater; for a 600 A panel, the width is typically 42 in.
Journeyman Electricians Certification Exam Prep
[MONATJE]
Question 12. Which conductor is identified as the “grounded conductor” in a typical residential 120/240‑V system? A) White B) Green C) Bare D) Red Answer: A Explanation: The white (or gray) insulated conductor is the neutral, which is the grounded conductor. Question 13. A 20‑A branch circuit supplies 12‑ga copper conductors. What is the maximum continuous load allowed on this circuit? A) 12 A B) 16 A C) 18 A D) 20 A Answer: B Explanation: Continuous loads must not exceed 80 % of the breaker rating: 0.8 × 20 A = 16 A. Question 14. NEC 250.122 requires equipment grounding conductors to be sized based on the rating of the overcurrent device. What size copper EGC is required for a 60‑A breaker? A) #10 AWG B) #8 AWG C) #6 AWG
Journeyman Electricians Certification Exam Prep
[MONATJE]
A) 103.5 A
B) 115 A
C) 126.5 A
D) 130 A
Answer: A Explanation: For 40 °C, apply a 0.90 factor: 115 A × 0.90 = 103.5 A. Question 18. What is the maximum number of #12 AWG THHN conductors that may be placed in a 1‑in. EMT conduit according to NEC Table 1, Chapter 9? A) 8 B) 9 C) 10 D) 12 Answer: C Explanation: Table 1 allows up to 10 conductors of #12 AWG in 1‑in. EMT. Question 19. Which of the following devices is required to be listed for use as a grounding electrode conductor? A) Copper‑clad steel rebar B) Bare copper wire #4 AWG or larger C) Aluminum conduit D) Galvanized steel pipe Answer: B Explanation: NEC permits bare copper wire #4 AWG or larger as a grounding electrode conductor.
Journeyman Electricians Certification Exam Prep
[MONATJE]
Question 20. A luminaire is installed in a bathtub enclosure. Which NEC article applies to its installation? A) 410.10(D) B) 410.12(A) C) 410.10(A) D) 410.36(B) Answer: C Explanation: Article 410.10(A) restricts luminaires in wet locations such as bathtubs. Question 21. What is the minimum size of a branch‑circuit conductor required to supply a 30 ‑A dryer circuit using copper conductors? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: C Explanation: NEC 210.19(A)(1) requires #8 AWG copper for a 30‑A dryer circuit. Question 22. A motor has a full‑load current of 25 A. Which standard motor overload setting provides the best protection? A) 75 % of FLC B) 100 % of FLC C) 115 % of FLC D) 150 % of FLC
Journeyman Electricians Certification Exam Prep
[MONATJE]
B) Flammable gases or vapors present only during abnormal operation. C) Conductive dust that is ignitable only in the presence of a spark. D) Non‑combustible liquids. Answer: B Explanation: Class I, Division 2 locations contain flammable gases or vapors that are not normally present but may appear under abnormal conditions. Question 26. In a healthcare facility, which NEC article governs patient‑care area grounding requirements? A) 517. B) 517. C) 517. D) 517. Answer: A Explanation: Article 517.12 specifies grounding and bonding for patient‑care areas. Question 27. What is the minimum clearance required between a swimming‑pool pump and the water surface according to NEC 680.26? A) 6 in. B) 12 in. C) 18 in. D) 24 in. Answer: B Explanation: NEC 680.26 requires a minimum of 12 in. clearance from the water surface.
Journeyman Electricians Certification Exam Prep
[MONATJE]
Question 28. Which NEC article covers the installation of photovoltaic (PV) systems? A) 690. B) 690. C) 690. D) 690. Answer: A Explanation: Article 690 contains the general requirements for PV power systems. Question 29. A megohmmeter reads 2 MΩ on a 100‑ft length of 12‑ga copper conductor. What is the insulation resistance per foot? A) 20 kΩ/ft B) 200 kΩ/ft C) 2 kΩ/ft D) 0.2 kΩ/ft Answer: A Explanation: 2 MΩ ÷ 100 ft = 20 kΩ per foot. Question 30. When using a clamp‑on ammeter on a three‑phase, 460‑V system, what is the correct factor to obtain true line current from the reading? A) 0. B) 1. C) 1. D) 2. Answer: B
Journeyman Electricians Certification Exam Prep
[MONATJE]
D) 4
Answer: B Explanation: NEC requires at least one receptacle outlet for each 6 ft of countertop, thus two per 12 ft. Question 34. What is the minimum size of a grounding electrode conductor for a 200‑A service using copper? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: Table 250.66 lists #4 AWG copper for a 200‑A service. Question 35. Which NEC article addresses the use of flexible metal conduit (FMC)? A) 344 B) 350 C) 358 D) 362 Answer: A Explanation: Article 344 covers Flexible Metal Conduit. Question 36. A motor‑operated pump is rated 5 hp, 460 V, 3‑phase. What is the approximate full‑load current? A) 5 A
Journeyman Electricians Certification Exam Prep
[MONATJE]
B) 8 A
C) 12 A
D) 15 A
Answer: B Explanation: Using the formula I = (hp × 746) / (√3 × V × efficiency). Assuming 90 % efficiency, I ≈ (5 × 746)/(1.732 × 460 × 0.9) ≈ 8 A. Question 37. According to NEC 300.5, what is the minimum burial depth for a PVC conduit carrying 120/240‑V residential circuits under a driveway? A) 12 in. B) 18 in. C) 24 in. D) 30 in. Answer: B Explanation: PVC conduit under a driveway must be buried at least 18 in. deep. Question 38. Which of the following is a permitted method for protecting conductors from physical damage in a stud wall? A) Nail plates B) Plastic ties only C) Bare copper strips D) None of the above Answer: A Explanation: Nail plates are required when conductors are within 1‑¼ in. of the edge of framing members.
Journeyman Electricians Certification Exam Prep
[MONATJE]
Answer: B Explanation: Article 511 addresses lighting fixtures for hazardous locations. Question 42. A conduit run contains three #6 AWG THHN conductors and one #10 AWG grounding conductor. What is the minimum conduit size required? A) 1/2‑in. EMT B) 3/4‑in. EMT C) 1‑in. EMT D) 1‑1/4‑in. EMT Answer: B Explanation: Using conduit fill tables, a 3/4‑in. EMT can accommodate up to 4 conductors of #6 AWG (or equivalent) with the required fill percentage. Question 43. Which of the following devices is required to be GFCI‑protected in a garage according to NEC 210.8(A)(2)? A) A 240‑V dryer outlet B) A 120‑V receptacle for a power tool C) A 120‑V receptacle for a refrigerator D) A 240‑V EV charging station Answer: B Explanation: All 125‑V, 15‑ and 20‑A receptacles in garages must be GFCI protected. Question 44. When interpreting a wiring diagram, the symbol “⟂” inside a circle indicates which component? A) Switch
Journeyman Electricians Certification Exam Prep
[MONATJE]
B) Receptacle C) Lamp (fixture) D) Motor Answer: C Explanation: The “⟂” inside a circle is the standard symbol for a light fixture. Question 45. A 250‑kVA transformer is installed with a 600‑V primary. What is the full‑load current on the primary side? A) 250 A B) 416 A C) 500 A D) 600 A Answer: B Explanation: I = kVA ÷ (√3 × V) = 250 ÷ (1.732 × 0.6) ≈ 416 A. Question 46. Which NEC article specifies the requirements for equipment grounding conductors in flexible cords? A) 400. B) 400. C) 400. D) 400. Answer: C Explanation: Article 400.9 addresses grounding conductors in flexible cords and cables. Question 47. In a three‑wire 120/240‑V circuit, which conductor is typically colored black?
Journeyman Electricians Certification Exam Prep
[MONATJE]
Question 50. A conduit system is installed in a building that experiences a temperature of 50 °C. What correction factor should be applied to conductor ampacity? A) 0. B) 0. C) 1. D) 1. Answer: B Explanation: NEC Table 310.15(B)(2)(a) gives a factor of 0.94 for 50 °C ambient temperature. Question 51. Which of the following is the correct method to verify a zero‑energy state before LOTO? A) Visual inspection only. B) Use of a multimeter to confirm absence of voltage. C) Listening for humming sounds. D) Checking the breaker position. Answer: B Explanation: Measuring with a calibrated instrument ensures no voltage is present. Question 52. What is the minimum distance required between a receptacle and a bathtub rim according to NEC 210.8(A)(10)? A) 3 ft B) 6 ft C) 9 ft D) 12 ft
Journeyman Electricians Certification Exam Prep
[MONATJE]
Answer: B Explanation: Receptacles must be installed at least 6 ft away from the tub edge. Question 53. In a residential panel, a 20‑A breaker supplies a 120‑V circuit. What is the maximum allowable continuous load on that circuit? A) 12 A B) 15 A C) 16 A D) 20 A Answer: A Explanation: Continuous load cannot exceed 80 % of the breaker rating: 0.8 × 20 A = 16 A, but NEC 210.23(A)(1) limits to 12 A for 20‑A branch circuits serving lighting and receptacles. Question 54. Which NEC article addresses requirements for wiring methods in agricultural buildings? A) 225. B) 225. C) 225. D) 225. Answer: B Explanation: Article 225.3 covers wiring installations in agricultural structures. Question 55. A 120‑V, 15‑A receptacle is installed in a wet location. Which type of enclosure is required? A) NEMA 1
