Download [NHJE2020] New Hampshire NH Journeyman Electrician 2020 Licensing Exam Preparation and more Exams Technology in PDF only on Docsity!
Electrician 2020 Licensing Exam Preparation
Question 1. Which NEC article defines the terms “grounded conductor” and “grounding conductor”? A) Article 100 B) Article 110 C) Article 250 D) Article 300 Answer: A Explanation: Article 100 of the NEC provides definitions for all fundamental electrical terms, including “grounded conductor” and “grounding conductor.” Question 2. According to Ohm’s Law, if the voltage across a resistor is 120 V and the resistance is 30 Ω, what is the current? A) 2 A B) 3 A C) 4 A D) 5 A Answer: B Explanation: I = V/R = 120 V / 30 Ω = 4 A. (Correction: 120 ÷ 30 = 4 A, so the correct answer is C.) Question 3. 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
Electrician 2020 Licensing Exam Preparation
Explanation: Line‑to‑line voltage = √ 3 × line‑to‑neutral = 1.732 × 120 V ≈ 208 V. Question 4. Which of the following is the correct formula for real power (P) in a single‑phase AC circuit? A) P = VI cos φ B) P = VI sin φ C) P = V² /R D) P = I² R Answer: A Explanation: Real power equals voltage times current times the power factor (cos φ). Question 5. The NEC requires a minimum working space clearance of 30 in. in front of a panelboard. This clearance is measured from the floor to what height? A) 6 ft B) 8 ft C) 10 ft D) 12 ft Answer: B Explanation: The NEC’s minimum headroom for working space is 6 ft 6 in., but the minimum clearance height is 6 ft; however, the standard is 8 ft for many applications. The correct answer is B (8 ft) as per Article 110.26(A)(1). Question 6. Which article governs the installation of service equipment and service disconnects? A) Article 210 B) Article 230 C) Article 240
Electrician 2020 Licensing Exam Preparation
B) #2 AWG
C) #0 AWG
D) 2/0 AWG
Answer: C Explanation: For 200 A copper service‑entrance conductors, the minimum size is 0 AWG (Table 310.15(B)(16)). Question 10. Which NEC article addresses the calculation of general lighting loads for dwelling units? A) Article 220. B) Article 220. C) Article 210.11(C)(1) D) Article 215. Answer: C Explanation: Article 210.11(C)(1) provides the method for calculating general lighting loads in dwelling units. Question 11. When calculating the load for a kitchen countertop receptacle circuit, how many receptacles are counted per the NEC? A) One per 2 ft of countertop B) One per 3 ft of countertop C) One per 4 ft of countertop D) One per 6 ft of countertop Answer: B Explanation: The NEC counts one receptacle per 3 ft of countertop space (Article 210.52(C)(1)).
Electrician 2020 Licensing Exam Preparation
Question 12. The demand factor for the first 3 kW of a dwelling’s general lighting load is: A) 100 % B) 80 % C) 70 % D) 50 % Answer: A Explanation: The NEC applies a 100 % demand factor to the first 3 kW of general lighting load (Article 220.42). Question 13. Which device must be installed in a bathroom that contains a bathtub or shower? A) AFCI B) GFCI C) Surge protector D) None of the above Answer: B Explanation: GFCI protection is required for receptacles in bathrooms (Article 210.8(A)(1)). Question 14. An AFCI is required in which of the following locations in a dwelling? A) All 120‑V, single‑phase, 15‑ and 20‑A branch circuits supplying bedroom outlets. B) Only in kitchens. C) Only in garages. D) Only in outdoor circuits. Answer: A Explanation: Article 210.12(A) requires AFCI protection for bedroom circuits.
Electrician 2020 Licensing Exam Preparation
Explanation: Table 250.66 shows that a 100‑A service requires a #8 AWG copper GEC. Question 18. Which of the following is NOT considered a grounding electrode? A) Metal underground water pipe B) Concrete‑encased electrode (Ufer) C) Metal building frame D) Ground rod Answer: C Explanation: The building steel frame is a grounding electrode only when it is bonded to a grounding electrode system; by itself it is not a primary grounding electrode. Question 19. The purpose of the main bonding jumper (MBJ) is to: A) Connect the neutral to the grounding electrode system. B) Provide a path for fault current back to the source. C) Bond all equipment grounds together. D) All of the above. Answer: D Explanation: The MBJ bonds the grounded conductor to the grounding electrode system, provides a low‑impedance fault path, and ties together all grounding conductors (Article 250.30). Question 20. When installing EMT conduit in a wet location, which of the following is required? A) Use of corrosion‑resistant fittings only. B) Application of a wet‑location rating to the EMT. C) No special requirements; EMT is permissible.
Electrician 2020 Licensing Exam Preparation
D) Replacement with RMC conduit. Answer: C Explanation: EMT is permitted in wet locations as long as it is listed for wet use (Article 358). Question 21. The ampacity adjustment factor for three current‑carrying conductors in a conduit rated 75 °C is: A) 0. B) 0. C) 0. D) 0. Answer: A Explanation: Table 310.15(B)(3)(a) provides a 0.80 factor for three conductors in a conduit. Question 22. What is the maximum number of conductors allowed in a ½‑in. EMT without exceeding the 40 % fill limit? A) 2 B) 3 C) 4 D) 5 Answer: B Explanation: Using Table 1 of Chapter 9, a ½‑in. EMT has an internal area of 0.304 in². Three #14 AWG THHN (0.013 in² each) total 0.039 in², which is under 40 % (0.122 in²). Four would exceed. Question 23. A 4‑in. PVC conduit is used to protect a 600‑V feeder. What is the minimum conduit wall thickness required per NEC? A) Schedule 20
Electrician 2020 Licensing Exam Preparation
Question 26. A receptacle installed in a garage must be GFCI‑protected. Which NEC article mandates this? A) Article 210.8(A)(2) B) Article 210.11(C)(2) C) Article 210.12(A) D) Article 210.52(B) Answer: A Explanation: Article 210.8(A)(2) requires GFCI protection for receptacles in garages. Question 27. For a motor rated 30 HP, 460 V, 3‑phase, what is the minimum size of the equipment grounding conductor (EGC) for a 60‑A breaker protecting the motor? A) #10 AWG copper B) #12 AWG copper C) #8 AWG copper D) #6 AWG copper Answer: C Explanation: Table 250.122 shows that a 60‑A overcurrent device requires a minimum #10 AWG copper EGC, but for motor circuits the EGC must be at least #8 AWG per Table 250.122 (adjusted for motor applications). Question 28. The NEC permits the use of a listed “dual‑rated” conduit for both ground and equipment grounding. This is an example of: A) Multi‑wire branch circuit. B) Grounding electrode conductor. C) Equipment grounding conductor. D) Bonding jumper. Answer: C
Electrician 2020 Licensing Exam Preparation
Explanation: Dual‑rated conduit (e.g., EMT) can serve as an equipment grounding conductor (Article 250.118). Question 29. Which of the following is the correct method for identifying a grounded (neutral) conductor in a 4‑wire 120/240‑V circuit? A) White or gray insulation. B) Black insulation. C) Green insulation. D) Bare or green‑yellow insulation. Answer: A Explanation: NEC identifies grounded (neutral) conductors with white or gray insulation (Article 200.6). Question 30. In a three‑wire MWBC feeding two 120‑V circuits, how must the neutral be identified? A) White only. B) Any color except green or bare. C) White or gray, or re‑identified with white/gray tape. D) Green or bare. Answer: C Explanation: The neutral may be re‑identified with white or gray tape at its terminations (Article 200.6). Question 31. A feeder supplying a 200‑A panel must have conductors sized for which ampacity? A) 150 A B) 200 A
Electrician 2020 Licensing Exam Preparation
A) Using a listed bonding jumper. B) Using a listed clamp with a grounding screw. C) Wrapping the pipe with bare copper wire. D) Using a listed pipe‑to‑ground clamp. Answer: C Explanation: Simply wrapping a pipe with bare copper wire is not an acceptable bonding method; a listed bonding jumper or clamp must be used. Question 35. A 30‑A GFCI receptacle is installed in a kitchen countertop circuit. What is the maximum allowed length of the branch circuit downstream of the GFCI? A) 20 ft B) 30 ft C) No limit, as long as the circuit is protected by a 30‑A breaker. D) 50 ft Answer: C Explanation: The NEC does not limit the length of a circuit downstream of a GFCI; only the overcurrent protection rating matters. Question 36. Which NEC article addresses the installation of raceways in hazardous (Class I) locations? A) Article 300. B) Article 500 C) Article 590 D) Article 610 Answer: B Explanation: Article 500 covers hazardous (Class I, II, III) locations, including raceway requirements.
Electrician 2020 Licensing Exam Preparation
Question 37. In a Class I, Division 2 (non‑explosive gas) area, which type of conduit is acceptable for power conductors? A) Rigid metal conduit (RMC) only. B) PVC conduit only. C) Both RMC and PVC are acceptable if listed for the environment. D) EMT is prohibited. Answer: C Explanation: Both RMC and PVC can be used in Class I, Division 2 areas if they are listed for that use (Article 500.12). Question 38. A motor starter must be located where the operator can see it and operate it without: A) Using a ladder. B) Exceeding a 6‑ft reach. C) Entering a confined space. D) All of the above. Answer: D Explanation: NEC 430.102 requires motor controllers to be readily accessible, visible, and operable without climbing, reaching beyond 6 ft, or entering a confined space. Question 39. For a 3‑phase, 460 V motor with a full‑load current of 25 A, what is the minimum size of the overcurrent protective device (OCPD) per NEC 430.52? A) 30 A B) 35 A C) 40 A D) 45 A
Electrician 2020 Licensing Exam Preparation
C) Two for redundancy D) No disconnect required if the motor is hard‑wired. Answer: B Explanation: NEC 430.102 requires a disconnecting means that simultaneously opens all ungrounded conductors (common trip). Question 43. Which of the following is the correct minimum height for a receptacle installed in a kitchen countertop? A) 12 in. above the countertop B) 15 in. above the countertop C) No minimum height; must be installed on the wall. D) 18 in. above the countertop Answer: C Explanation: Receptacles must be mounted on the wall; the NEC does not specify a height above the countertop (Article 210.52(C)(1)). Question 44. A 4‑wire feeder to a subpanel includes a neutral conductor. How must the neutral be handled at the subpanel? A) Bonded to the grounding bar. B) Isolated from the grounding bar. C) Connected to the equipment grounding conductor. D) Tied together with the hot conductors. Answer: B Explanation: In a subpanel, the neutral must be isolated from the grounding bar to prevent parallel paths (Article 250.24).
Electrician 2020 Licensing Exam Preparation
Question 45. Which article defines the requirements for “dedicated equipment space” for electrical equipment? A) Article 110 B) Article 210 C) Article 300 D) Article 400 Answer: A Explanation: Article 110.26 outlines the required dedicated equipment space around electrical equipment. Question 46. The minimum size of a copper grounding electrode conductor (GEC) for a 150 ‑A service is: A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: Table 250.66 shows #10 AWG copper for a 150‑A service. Question 47. In a residential dwelling, the maximum number of receptacles allowed on a single 15‑A branch circuit is: A) 8 B) 10 C) 12 D) No specific limit; must be based on load calculation. Answer: D
Electrician 2020 Licensing Exam Preparation
C) 50 %
D) 60 %
Answer: B Explanation: For more than two conductors, the NEC limits conduit fill to 40 % of the internal area (Article 310.15). Question 51. Which NEC article governs the installation of luminaires in damp locations such as laundry rooms? A) Article 410.10(A) B) Article 410.10(B) C) Article 410.10(C) D) Article 410.10(D) Answer: B Explanation: Article 410.10(B) covers damp locations, which include laundry rooms. Question 52. What is the minimum size of a copper equipment grounding conductor for a 100 ‑A circuit protected by a 100‑A breaker? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: B Explanation: Table 250.122 indicates #10 AWG copper for a 100‑A overcurrent device. Question 53. A feeder supplying a 60‑A subpanel is installed with 4‑AWG copper conductors. Is this conductor size acceptable?
Electrician 2020 Licensing Exam Preparation
A) Yes, because 4 AWG exceeds the required ampacity. B) No, because 4 AWG is too large and not permitted. C) Yes, but only if the conduit is larger than 1‑in. D) No, because 4 AWG is rated for only 55 A. Answer: A Explanation: 4 AWG copper is rated for 85 A at 75 °C, which exceeds the 60‑A requirement. Question 54. Which of the following is a required marking on a service disconnecting means? A) The ampere rating of the service. B) The voltage rating of the equipment. C) The name of the installer. D) The date of installation. Answer: A Explanation: Service disconnects must be marked with the rating of the service (Article 230.71). Question 55. In a dwelling, the required number of GFCI‑protected receptacles for a bathroom with a vanity sink is: A) One B) Two C) Three D) Four Answer: A Explanation: At least one receptacle in the bathroom must be GFCI‑protected (Article 210.8(A)(1)).
