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Question 1. Under RCW 19.28, which entity issues the Master Electrician license in Washington State? A) Washington State Department of Labor B) Washington State Electrical Board C) Local city building department D) Washington State Department of Revenue Answer: B Explanation: The Washington State Electrical Board is the statutory agency authorized to issue electrical licenses, including the Master Electrician license, as mandated by RCW 19.28. Question 2. According to WAC 296-46B-120, a “Stop Work” order may be issued when: A) The contractor fails to pay the licensing fee on time. B) An inspection reveals a violation of the NEC that creates an unsafe condition. C) The contractor requests a pause for material delivery. D) The project exceeds the estimated budget. Answer: B Explanation: A “Stop Work” order is a safety enforcement tool used when an inspection uncovers a condition that does not comply with the NEC and poses a hazard. Question 3. In Washington, the definition of “maintenance” for 07B licensing excludes which of the following? A) Replacing a faulty receptacle.
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B) Adding a new branch circuit to serve a new bathroom. C) Repairing a broken light switch. D) Upgrading an existing circuit’s breaker size. Answer: B Explanation: Adding a new circuit for a new bathroom is considered new construction, not maintenance, under the 07B definition. Question 4. Article 90 of the NEC defines “accessible” as: A) Capable of being reached without removing any part of the equipment. B) Capable of being reached without using tools. C) Capable of being reached without damaging the equipment. D) Capable of being reached without removing any part of the building structure. Answer: A Explanation: “Accessible” means capable of being reached for operation, inspection, or maintenance without removing any part of the equipment or building. Question 5. “Readily accessible” as defined in Article 100 means: A) Accessible only after removing a panel cover. B) Accessible without using tools or removing any part of the equipment. C) Accessible after opening a door. D) Accessible only by qualified personnel. Answer: B
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B) Load power factor. C) Ambient temperature correction. D) Number of breakers in the panel. Answer: D Explanation: The number of breakers does not affect voltage drop; resistance, temperature, and power factor are relevant. Question 9. In residential lighting, a series circuit will: A. Increase the total current compared to a parallel circuit. B. Keep the same voltage across each fixture. C. Reduce the overall current draw. D. Provide the same illumination as a parallel circuit. Answer: C Explanation: In a series circuit, the same current flows through all devices, so the total current is limited by the highest resistance, often reducing overall draw. Question 10. Which article governs the requirements for electrical connections and terminations? A) Article 110 B) Article 210 C) Article 300 D) Article 410 Answer: A
07BResidential
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Explanation: Article 110 of the NEC sets the standards for connections, terminations, and equipment identification. Question 11. The NEC requires a minimum working space in front of a panelboard to be: A) 24 in. wide, 30 in. deep, and 6 ft. high. B) 30 in. wide, 36 in. deep, and 6 ft. high. C) 36 in. wide, 30 in. deep, and 7 ft. high. D) 30 in. wide, 30 in. deep, and 8 ft. high. Answer: B Explanation: NEC 110.26 requires a minimum working space of 30 in. wide, 36 in. deep, and 6 ft. high in front of equipment. Question 12. Which of the following is a required small-appliance branch circuit in a dwelling? A) 20-A circuit for the kitchen countertop receptacles. B) 15-A circuit for the bedroom lighting. C) 30-A circuit for the dryer. D) 10-A circuit for the hallway. Answer: A Explanation: NEC 210.11(C)(1) requires at least two 20-A small-appliance circuits for kitchen countertop receptacles. Question 13. A GFCI protected receptacle must be installed in which location in a dwelling?
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Answer: B Explanation: 30 kVA / 240 V = 125 A. The feeder must be sized at least to the calculated load, so a 125-A conductor is required. Question 16. Article 220 provides demand factors for general lighting loads. For a dwelling with 10,000 sq ft of floor area, the demand factor for the first 3,000 sq ft is: A) 100 % B) 75 % C) 50 % D) 30 % Answer: A Explanation: NEC Table 220.42 states 100 % demand for the first 3,000 sq ft of general lighting load. Question 17. When calculating the load for an electric range rated at 8 kW, which demand factor is applied according to NEC 220.55? A) 100 % B) 80 % C) 50 % D) 65 % Answer: B Explanation: NEC 220.55 allows a 80 % demand factor for the first 40 kW of range load.
07BResidential
Maintenanceination Ultimate
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Question 18. Which grounding electrode is considered the most effective for residential grounding? A) Metal water pipe. B) Concrete-encased electrode (Ufer). C) Ground rod. D) Metal chassis of the service disconnect. Answer: B Explanation: A concrete-encased electrode (Ufer) provides a low-impedance path and is often the most effective grounding method. Question 19. When bonding a metal water pipe that is part of the grounding electrode system, the required size of the bonding jumper for a 100-A service is: A) 10 AWG copper. B) 8 AWG copper. C) 6 AWG copper. D) 4 AWG copper. Answer: B Explanation: NEC 250.104(A)(1) requires a minimum of 8 AWG copper for grounding electrode conductors for services up to 100 A. Question 20. The equipment grounding conductor (EGC) for a 12-AWG branch circuit protected by a 20-A breaker must be at least: A) 14 AWG copper. B) 12 AWG copper.
07BResidential
Maintenanceination Ultimate
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Question 23. Box fill calculations consider each conductor as: A) One volume unit regardless of size. B) Two volume units for each insulated conductor. C) One volume unit per conductor size per Table 314.16(B). D) One volume unit per device. Answer: C Explanation: NEC Table 314.16(B) assigns a specific volume per conductor based on its gauge; each conductor counts toward the box fill accordingly. Question 24. Adding an extension ring to a device box adds how many volume units to the box fill? A) One unit per ring. B) Two units per ring. C) No additional units. D) Three units per ring. Answer: B Explanation: NEC 314.16(B) states that each internal clamp or extension ring counts as two conductor equivalents toward box fill. Question 25. The NEC requires a dedicated disconnecting means for a water heater of 4500 W. This disconnect must be rated at: A) 15 A. B) 20 A. C) 30 A.
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D) 40 A.
Answer: B Explanation: A 4500-W water heater at 240 V draws 18.75 A; a 20-A disconnect is the smallest standard size that exceeds the load. Question 26. A kitchen countertop receptacle must be GFCI protected and located no farther than: A) 24 in. from the edge of the countertop. B) 36 in. from the edge of the countertop. C) 48 in. from the edge of the countertop. D) 12 in. from the edge of the countertop. Answer: A Explanation: NEC 210.8(A)(6) requires countertop receptacles to be within 24 in. of the countertop edge. Question 27. For a ceiling fan rated at 300 W, the minimum circuit breaker size required is: A) 15 A. B) 20 A. C) 10 A. D) 30 A. Answer: A Explanation: 300 W at 120 V draws 2.5 A; the smallest standard breaker that can safely protect the circuit is 15 A.
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C) 10 AWG copper. D) 8 AWG copper. Answer: C Explanation: 12 A × 1.25 = 15 A; per NEC Table 310.15(B)(16), 10 AWG copper is rated for 30 A at 60 °C, satisfying the requirement. Question 31. For a residential pool pump motor rated 1.5 hp, NEC 680. requires a dedicated GFCI-protected receptacle to be installed: A) Within 6 ft. of the pump. B) At the pool equipment pad only. C) Anywhere on the same circuit. D) At the main service panel. Answer: A Explanation: NEC 680.22 mandates a GFCI-protected receptacle within 6 ft. of the pool pump motor. Question 32. The equipotential bonding requirement for a swimming pool includes bonding which of the following? A) Only the pool water. B) The metal ladder, handrails, and any metal conduit in contact with water. C) Only the pool pump. D) Only the pool’s concrete deck. Answer: B Explanation: NEC 680.26 requires bonding of all metal parts that may become energized, including ladders, handrails, and conduit.
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Question 33. In a residential solar PV system, the rapid shutdown requirement applies to: A) All modules on the roof. B) Modules located on the same roof plane as the inverter. C) Only the modules within 10 ft. of the building. D) The portion of the array within the defined “service area.” Answer: D Explanation: NEC 690.12 requires a rapid-shutdown system for the portion of the PV array that is within the building’s service area. Question 34. Low-voltage telephone wiring must be separated from power conductors by at least: A) 6 in. of vertical separation. B) 12 in. of horizontal separation. C) 24 in. of any separation. D) No separation if in the same conduit. Answer: A Explanation: NEC 800.133 requires a minimum of 6 in. vertical separation between low-voltage and power conductors when run in the same raceway or enclosure. Question 35. Which of the following is considered “readily accessible” for a communications cable entry point? A) Inside a junction box.
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Maintenanceination Ultimate
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Explanation: NEC Table 250.122 indicates a 150 A service requires a minimum 6 AWG copper GEC. Question 38. For a 120-V, 15-A lighting circuit, the maximum number of 14 - AWG conductors that may be placed in a standard single-gang device box (volume 18 cu in.) is: A) 8 conductors. B) 10 conductors. C) 12 conductors. D) 14 conductors. Answer: B Explanation: Each 14-AWG conductor counts as 2.25 cu in. per Table 314.16(B). 10 × 2.25 = 22.5 cu in., exceeding 18 cu in.; thus only 8 conductors (8 × 2.25 = 18 cu in.) may be used. Therefore the correct answer is A. Question 39. The NEC permits the use of aluminum conductors for branch circuits in residential applications provided that: A) They are the same size as copper. B) They are marked “AL” and used with proper connectors. C) They are only used for grounding. D) They are installed in conduit only. Answer: B Explanation: Aluminum conductors must be identified as “AL” and used with connectors listed for aluminum to prevent corrosion and loosening.
07BResidential
Maintenanceination Ultimate
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Question 40. When installing a new receptacle in a bathroom, the required grounding conductor must be: A) The same size as the circuit’s ungrounded conductor. B) At least 12 AWG regardless of circuit size. C) No larger than 14 AWG. D) A separate dedicated grounding wire. Answer: A Explanation: NEC 250.130(C) requires the grounding conductor to be the same size as the circuit’s ungrounded (hot) conductor for branch-circuit extensions. Question 41. The NEC defines “dedicated space” around a panelboard as: A) The area directly in front of the panel. B) The area within 30 in. of the panel’s sides. C) The area behind the panel. D) The area within 6 ft. of the panel. Answer: A Explanation: “Dedicated space” refers to the working space directly in front of the equipment, as defined in Article 110.26. Question 42. For a 240-V dryer circuit protected by a 30-A breaker, the minimum conductor size (copper) required is: A) 12 AWG. B) 10 AWG. C) 8 AWG.
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Question 45. A 3-wire NM cable (black, white, bare) is used to feed a 120/240-V split-phase circuit. The neutral must be identified by: A) Stripping the insulation. B) Using a white or gray outer sheath. C) Marking with black tape. D) No identification required. Answer: B Explanation: NEC 200.6 requires the grounded (neutral) conductor to be identified by a continuous white or gray outer finish. Question 46. The NEC permits the use of a single-pole breaker to protect a multi-wire branch circuit (MWBC) only if: A) The breaker is listed as a “common trip.” B) The circuits are on separate phases. C) The breaker is a GFCI type. D) The MWBC supplies only lighting loads. Answer: A Explanation: MWBCs must have a common-trip or handle-tied breaker to ensure simultaneous disconnection of both ungrounded conductors. Question 47. A residential dwelling with a total calculated load of 70 kVA requires a service entrance conductor sized for: A) 100 A. B) 125 A.
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C) 150 A.
D) 200 A.
Answer: C Explanation: 70 kVA at 240 V equals 291 A; however, NEC demand factors reduce the required service size. Typically a 150 A service is sufficient for a 70 kVA load after applying demand factors. Question 48. The NEC requires that a receptacle in a kitchen countertop be GFCI protected and be of which type? A) Tamper-resistant (TR). B) Weather-proof (WR). C) Ground-fault circuit interrupter (GFCI) only. D) No special type required. Answer: A Explanation: NEC 210.8(A)(6) requires countertop receptacles to be both GFCI protected and tamper-resistant. Question 49. For a 12-AWG copper feeder supplying a sub-panel, the maximum allowable voltage drop for a 150-ft run at full load is: A) 2 % B) 3 % C) 5 % D) 10 % Answer: B
