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Electrician Ultimate Exam
Question 198. In a 3-phase, 4-wire wye system, what is the line-to-neutral voltage if the line-to-line voltage is 480 V? A) 138 V B) 277 V C) 240 V D) 415 V Answer: B Explanation: In a wye system, V L-N = V L-L ÷ √3 = 480 V ÷ 1.732 ≈ 277 V. Question 199. According to NEC Table 310.15(B)(3)(a), what is the ampacity correction factor for a conduit containing 5 current-carrying conductors at an ambient temperature of 30 °C? A) 0.80 B) 0.85 C) 0.90 D) 0. Answer: C Explanation: For 4-6 conductors the correction factor at 30 °C is 0.90. Question 200. A 125 A feeder is installed in a 75 °C rated conduit. Which conductor size (copper, THHN) is the minimum required according to Table 310.16? A) 1 AWG B) 2 AWG C) 3 AWG D) 4 AWG Answer: B Explanation: At 75 °C, 2 AWG copper is rated for 115 A; applying the 125 % multiplier for feeders (1.25 × 115 A = 144 A) allows 2 AWG, which exceeds the required 125 A. Question 201. For a motor-operated laundry dryer requiring a 30 A branch circuit, what size of copper grounding-electrode conductor (GEC) is required per NEC 250.122? A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: B Explanation: A 30 A overcurrent device requires a minimum 12 AWG copper GEC.
Electrician Ultimate Exam
Question 202. Which NEC article governs the installation of receptacles in a wet bar? A) 210.52(B)(3) B) 210.8(A)(10) C) 210.11(C) D) 210. Answer: A Explanation: Article 210.52(B)(3) specifies the required number of receptacles in a wet bar. Question 203. A 1500 W electric water heater is installed on a 240 V branch circuit. What is the minimum breaker size required? A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: Current = 1500 W ÷ 240 V = 6.25 A. NEC requires a breaker sized at least 125 % of the load: 6.25 A × 1.25 ≈ 7.8 A → 15 A breaker is acceptable, but the next standard size is 20 A, which is commonly used for water heaters. Question 204. Which of the following is the correct conduit fill for three 4 AWG THHN conductors in a 1-inch EMT raceway? A) 31 % B) 40 % C) 53 % D) 60 % Answer: B Explanation: The NEC permits a maximum fill of 40 % for three or more conductors; three 4 AWG THHN in 1-inch EMT occupy about 38 % of the cross-sectional area. Question 205. Under NEC 210.12, where must AFCI protection be installed in a new single-family dwelling? A) All 120 V, 15- and 20-A branch circuits supplying outlets in living areas B) Only kitchen countertop circuits C) Only bedroom circuits D) All circuits, including 240 V appliances
Electrician Ultimate Exam
Question 209. For a swimming pool pump motor rated 5 HP, 460 V, 3-phase, what is the minimum size of the equipment grounding conductor per NEC 250.122? A) 12 AWG B) 10 AWG C) 8 AWG D) 6 AWG Answer: C Explanation: A 5 HP motor typically requires a 30 A branch circuit; per Table 250.122, a 30 A circuit requires at least 8 AWG copper EGC. Question 210. In a multi-wire branch circuit (MWBC) supplying two 120 V circuits, what is required for the neutral conductor? A) It must be insulated and larger than the hot conductors B) It may be the same size as the hot conductors C) It must be grounded at each outlet D) It must be a separate conductor for each hot leg Answer: B Explanation: NEC permits the neutral to be the same size as the ungrounded conductors in an MWBC, provided the loads are balanced. Question 211. Which NEC article governs the installation of fire alarm circuits? A) 760 B) 645 C) 300 D) 210 Answer: A Explanation: Article 760 covers fire alarm systems, including wiring methods and circuit requirements. Question 212. A 4-wire feeder supplies a detached garage. Which conductor must be insulated? A) Grounding-electrode conductor B) Equipment grounding conductor C) Neutral (grounded) conductor D) All conductors must be insulated Answer: D
Electrician Ultimate Exam
Explanation: All conductors in a feeder, including the neutral and equipment grounding conductor, must be insulated per NEC 300.3(B). Question 213. According to Montana licensure rules, how many hours of practical experience are required before applying for a journeyman electrician license? A) 4,000 B) 6,000 C) 8,000 D) 10, Answer: C Explanation: Montana requires 8,000 hours (approximately 4 years) of documented practical experience. Question 214. When installing a conduit in a concrete slab, what is the required minimum concrete cover for PVC conduit per NEC 300.22? A) 1 in B) 1.5 in C) 2 in D) 2.5 in Answer: B Explanation: PVC conduit requires a minimum of 1.5 in concrete cover to protect against physical damage. Question 215. A 30 A, 240 V, single-phase motor has a full-load current of 22 A. What size of branch-circuit conductor (copper, THHN) is required per NEC 430.22? A) 10 AWG B) 8 AWG C) 6 AWG D) 4 AWG Answer: B Explanation: Conductors must be sized at 125 % of the motor FLC: 22 A × 1.25 = 27.5 A. 8 AWG copper THHN is rated for 40 A at 75 °C, satisfying the requirement. Question 216. Which NEC article specifies the requirements for grounding electrode conductors in a detached structure? A) 250.32 B) 250.50 C) 250.68 D) 250.
Electrician Ultimate Exam
A) 15 A B) 20 A C) 25 A D) 30 A
Answer: B Explanation: Load current = 300 W ÷ 120 V = 2.5 A. NEC requires a breaker not less than 125 % of the continuous load: 2.5 A × 1.25 = 3.125 A → a 15 A breaker is the smallest standard size, but a 20 A breaker is typically used for lighting circuits to allow future expansion. Question 221. In a Class II, Division 1 hazardous location, which type of wiring method is permitted for power conductors? A) NM-B cable B) MC cable C) Rigid metal conduit (RMC) D) Any of the above Answer: C Explanation: Only raceways listed for the specific hazardous classification, such as RMC, are permitted; NM-B and MC are not allowed in Class II, Div 1. Question 222. What is the minimum size of the grounding-electrode conductor required for a 200 A service entrance? A) 8 AWG copper B) 6 AWG copper C) 4 AWG copper D) 2 AWG copper Answer: B Explanation: NEC Table 250.66 requires a minimum of 6 AWG copper for a 200 A service. Question 223. Which NEC article governs the installation of low-voltage fire alarm signaling circuits? A) 760 B) 725 C) 645 D) 300 Answer: B Explanation: Article 725 covers Class 2 and Class 3 power-limited circuits, which include fire alarm signaling.
Electrician Ultimate Exam
Question 224. A 120/240 V, single-phase, 30 A feeder supplies a detached garage. How many grounding conductors are required? A) One equipment grounding conductor B) Two, one for each hot leg C) One neutral that also serves as grounding D) None, grounding is provided by the water pipe Answer: A Explanation: NEC 250.118 requires a single equipment grounding conductor for the feeder. Question 225. For a 30 A, 240 V, single-phase dryer circuit, what is the required minimum conductor size (copper, THHN) for the ungrounded conductors? A) 12 AWG B) 10 AWG C) 8 AWG D) 6 AWG Answer: B Explanation: 30 A circuits require a minimum of 10 AWG copper THHN (rated 30 A at 60 °C, 35 A at 75 °C). Question 226. Which NEC article specifies the requirements for bonding of metal water piping systems? A) 250.52(F) B) 250.104 C) 250.110 D) 250. Answer: B Explanation: Article 250.104 details bonding of metal water piping and other conductive systems. Question 227. In a commercial building, a receptacle is required to be GFCI protected if it is installed within how many feet of a sink? A) 3 ft B) 4 ft C) 5 ft D) 6 ft Answer: C Explanation: NEC 210.8(A)(6) requires GFCI protection for receptacles installed within 5 ft of a sink in commercial locations.
Electrician Ultimate Exam
Question 232. Which NEC article addresses the installation of equipment in Class III hazardous locations? A) 500 B) 501 C) 502 D) 503 Answer: B Explanation: Article 501 covers Class III hazardous (flammable dust) locations. Question 233. A 15-A, 120 V circuit supplies a kitchen countertop. How many receptacles are required per NEC 210.52(C)(1) for every 12 ft of countertop? A) One B) Two C) Three D) Four Answer: B Explanation: NEC requires at least two receptacles per 12 ft of countertop in a kitchen. Question 234. Which NEC article governs the installation of raceways in wet locations? A) 300.5 B) 300.9 C) 300.11 D) 300. Answer: B Explanation: Article 300.9 details the requirements for raceways in wet locations. Question 235. For a 125 A feeder protected by a 125 A breaker, what is the minimum size of the equipment grounding conductor (copper) per NEC 250.122? A) 8 AWG B) 6 AWG C) 4 AWG D) 2 AWG Answer: B Explanation: Table 250.122 lists 6 AWG copper for a 125 A overcurrent device.
Electrician Ultimate Exam
Question 236. Which NEC article specifies the requirements for grounding electrode conductors for concrete-encased (Ufer) grounds? A) 250.52(A)(3) B) 250.68(A) C) 250.70(A) D) 250. Answer: B Explanation: Article 250.68(A) outlines the installation of grounding electrode conductors for Ufer grounds. Question 237. A 30 A, 240 V dryer circuit must be protected by a breaker. What is the minimum breaker size allowed by NEC 210.20(A)? A) 25 A B) 30 A C) 35 A D) 40 A Answer: B Explanation: The breaker must be at least equal to the load current; therefore, a 30 A breaker is the minimum. Question 238. In a Multi-Wire Branch Circuit, what is the required method for simultaneous disconnection of the ungrounded conductors? A) A double-pole breaker or handle-tied single-pole breakers B) A single-pole breaker only C) A fuse on each hot leg D) No requirement for simultaneous disconnect Answer: A Explanation: NEC 210.4(B) requires simultaneous disconnect of all ungrounded conductors in an MWBC. Question 239. Which NEC article addresses the installation of low-voltage wiring for data and telecommunications? A) 800 B) 820 C) 830 D) 840 Answer: A
Electrician Ultimate Exam
Explanation: NEC requires overload protection set at not less than 115 % and not more than 125 % of the motor’s full-load current; the typical setting is 125 %. Question 244. Which NEC article governs the installation of equipment in Class I, Division 2 hazardous locations? A) 500 B) 501 C) 502 D) 503 Answer: A Explanation: Article 500 covers Class I hazardous (flammable gases or vapors) locations, including Division 2. Question 245. A detached garage has a 120/240 V, 100 A feeder. What is the minimum size of the grounding-electrode conductor required for the garage’s grounding electrode system? A) 8 AWG copper B) 6 AWG copper C) 4 AWG copper D) 2 AWG copper Answer: B Explanation: For a 100 A feeder, Table 250.66 requires a minimum of 6 AWG copper grounding-electrode conductor. Question 246. Which NEC article specifies the requirements for bonding of the metal raceway to the equipment grounding conductor? A) 250.118 B) 250.120 C) 250.122 D) 250. Answer: B Explanation: Article 250.120 covers bonding of metal raceways and enclosures to the equipment grounding conductor. Question 247. A residential dryer requires a dedicated 30 A, 240 V circuit. How many 12 AWG conductors are permitted in the same raceway for this circuit? A) One only B) Two only C) Three (including a neutral) D) Four (including a neutral and EGC)
Electrician Ultimate Exam
Answer: B Explanation: A dryer circuit is a 2-wire (hot-hot) circuit; only the two ungrounded conductors are required. The equipment grounding conductor is not counted as a current-carrying conductor. Question 248. Which NEC article governs the installation of receptacles in outdoor locations? A) 210.8(A)(3) B) 210.8(A)(4) C) 210.8(A)(5) D) 210.8(A)(6) Answer: B Explanation: Article 210.8(A)(4) requires GFCI protection for outdoor receptacles. Question 249. For a 240 V, 3-phase motor rated 10 HP with a full-load current of 23 A, what is the minimum size of the branch-circuit conductor (copper, THHN) per NEC 430.22? A) 10 AWG B) 8 AWG C) 6 AWG D) 4 AWG Answer: B Explanation: Conductors must be sized at 125 % of the motor FLC: 23 A × 1.25 = 28.75 A. 8 AWG copper THHN is rated for 40 A at 75 °C, satisfying the requirement. Question 250. Which NEC article specifies the requirements for the installation of fire alarm power supplies and control units? A) 760 B) 725 C) 645 D) 300 Answer: A Explanation: Article 760 covers fire alarm systems, including power supplies, control units, and associated wiring.
