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07DAppliance Repairination
Ultimate Exam
Question 1. Under RCW 19.28, which entity has the statutory authority to issue Master Electrician licenses in Washington? A) Washington State Department of Safety B) Department of Labor & Industries (L&I) C) Washington State Board of Electrical Examiners D) Local city building department Answer: B Explanation: RCW 19.28 designates the Department of Labor & Industries (L&I) as the agency responsible for licensing electricians, including the Master designation. Question 2. WAC 296-46B-010 modifies the NEC primarily to address which of the following? A) Renewable energy integration B) Fire alarm system wiring C) Appliance grounding requirements specific to Washington D) Cable tray spacing in high-rise buildings Answer: C Explanation: The Washington amendment focuses on appliance grounding and related safety provisions that differ from the national code. Question 3. A Master Electrician must be “available” to a firm for how long after the 24-hour disassociation rule is triggered? A) 48 hours B) 7 days C) 30 days
07DAppliance Repairination
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D) The Master must remain available indefinitely until a new Master is assigned. Answer: D Explanation: Once a Master disassociates, the firm must promptly appoint a new Master; the former Master is no longer required to be “available.” Question 4. When replacing a built-in commercial dishwasher, a “Class B” permit is required if the appliance is rated at what minimum VA? A) 1,200 VA B) 2,000 VA C) 3,000 VA D) 5,000 VA Answer: C Explanation: Washington’s Class B permit applies to appliances with a rating of 3 kVA or greater, ensuring a higher level of inspection. Question 5. To appeal a stop-work order issued by L&I, the first step is to: A) File a claim in the Washington State Superior Court B) Request an informal conference with the issuing inspector C) Submit a written appeal to the L&I Hearing Officer within 10 days D) Pay a fine and resume work immediately Answer: C Explanation: The statutory process requires a written appeal to the L&I Hearing Officer within the specified timeframe. Question 6. Article 90 of the NEC states the code’s purpose is to:
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Explanation: NEC Table 110.14(C) specifies a torque of 12 in-lb for 75 °C rated screw terminals. Question 9. For a commercial ice-cream freezer, the live parts must be guarded to prevent accidental contact. Which of the following satisfies the requirement? A) A removable metal cover with a latch B) An insulated plastic barrier that can be lifted by a user C) No guard is required if the appliance is in a locked room D) A glass panel that is not removable Answer: A Explanation: A removable metal cover with a latch provides a positive guard that can be secured, meeting the live-part protection rule. Question 10. An in-sight disconnect for a 2 kVA commercial water heater must be located within: A) 6 ft of the appliance B) 10 ft of the appliance C) 20 ft of the appliance D) 30 ft of the appliance Answer: B Explanation: NEC 422.31 requires the disconnect to be “in sight” and not more than 10 ft from the appliance. Question 11. The branch-circuit overcurrent protection for a single-phase 120 V, 15 A rated kitchen range must be sized at: A) 15 A
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B) 20 A
C) 25 A
D) 30 A
Answer: B Explanation: NEC 422.13 permits the branch-circuit rating to be the marked rating or the next standard size up; 20 A is the next standard size above 15 A. Question 12. Which of the following water-heater installations requires a dedicated grounding electrode? A) A 150-gallon electric storage heater installed in a commercial kitchen B) A 50-gallon electric tank in a residential basement C) An instant-on gas water heater D) A point-of-use electric kettle Answer: A Explanation: Large commercial electric storage heaters must have a dedicated grounding electrode per NEC 250.52(A)(3). Question 13. For a commercial deep-fat fryer rated at 4 kW, the required minimum branch-circuit ampacity is: A) 16 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: 4 kW ÷ 240 V = 16.7 A; applying the 125 % continuous load factor yields 20.9 A, rounded up to the next standard size, 20 A.
07DAppliance Repairination
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(2 %). The correct answer based on the 3 % rule is 3.6 V, which corresponds to option C. Answer: C Explanation: 120 V × 0.03 = 3.6 V. Question 16. In an unbalanced three-phase commercial kitchen load, the neutral conductor size may be reduced because: A) The neutral only carries harmonic currents B) The neutral is only required for 120 V loads, not three-phase loads C) NEC 220.61 permits neutral reduction when the calculated neutral current is less than 50 % of the phase current D) The neutral must always be the same size as the phase conductors Answer: C Explanation: NEC 220.61 allows neutral reduction when the calculated neutral current is ≤ 50 % of the phase conductor ampacity. Question 17. According to Article 430, the Full-Load Current (FLC) for a motor-driven commercial dryer is taken from: A) The nameplate rating only B) NEC Table 430.248, after applying the appropriate temperature correction factor C) The circuit breaker size installed on the branch circuit D) The motor’s locked-rotor current Answer: B Explanation: NEC Table 430.248 provides the FLC values for motors, with adjustments for temperature and other factors as required.
07DAppliance Repairination
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Question 18. A motor-driven commercial hood fan must have overload protection that trips at no more than: A) 115 % of the motor’s FLC B) 135 % of the motor’s FLC C) 150 % of the motor’s FLC D) 200 % of the motor’s FLC Answer: B Explanation: NEC 430.32 requires overload protection to trip at not more than 135 % of the motor’s full-load current. Question 19. For a 5 hp three-phase motor in a restaurant, the disconnecting means must be located within: A) 6 ft of the motor B) 10 ft of the motor C) 25 ft of the motor D) Inside the same equipment room, regardless of distance Answer: B Explanation: NEC 430.102 requires the disconnect to be within sight, generally interpreted as not more than 10 ft away for commercial installations. Question 20. An Equipment Grounding Conductor (EGC) for a 30 A branch circuit must be at least what size copper wire? A) #10 AWG B) #12 AWG C) #8 AWG
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Question 23. GFCI protection is required for which of the following commercial kitchen appliances? A) A wall-mounted electric range B) A walk-in refrigerator C) A commercial dishwasher located under a sink D) A vent hood exhaust fan located above the ceiling Answer: C Explanation: NEC 210.8(A)(2) requires GFCI protection for receptacles serving dishwashers in wet locations. Question 24. Flexible cord (Article 400) may be used for permanent wiring of a commercial coffee maker only if: A) The cord is rated for at least 600 V and the installation is less than 25 ft long B) The cord is listed for “permanent wiring” and the load does not exceed 20 A C) The appliance is installed in a mobile food trailer D) Flexible cord is never permitted for permanent wiring in commercial settings Answer: B Explanation: NEC 400.7 permits flexible cord for permanent wiring only when it is listed for that purpose and the ampacity does not exceed the listed limit (typically 20 A for 12 AWG). Question 25. When installing Liquidtight Flexible Metal Conduit (LFMC) in a greasy kitchen environment, the conduit must be: A) Labeled “Sealtite” and installed with a minimum of 1 in. clearance from combustible material
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B) Painted with a high-temperature coating C) Replaced with PVC conduit after 5 years D) Installed only in walls, never exposed Answer: A Explanation: LFMC labeled “Sealtite” is rated for grease and moisture; NEC 352.10 requires a 1-in. clearance from combustible material. Question 26. Ambient temperature derating for a 4-conductor raceway in a 40 °C room requires a correction factor of: A) 0. B) 0. C) 0. D) 1. Answer: B Explanation: NEC Table 310.15(B)(2)(a) shows a 0.94 factor for 40 °C ambient temperature for conductors rated 90 °C or less. Question 27. NFPA 70E defines the limited approach boundary for a qualified person working on an exposed live part of 480 V as: A) 5 ft B) 4 ft C) 3 ft D) 2 ft Answer: C Explanation: For 480 V systems, the limited approach boundary is 3 ft per NFPA 70E Table 130.5(C).
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C) 14 ft D) 16 ft Answer: C Explanation: OSHA requires the ladder to extend at least 1 ft above the landing point; therefore a 13-ft ladder is needed, and the next standard size is 14 ft. Question 31. A commercial ice-cream freezer rated at 2 kW, 208 V, single-phase must be protected by a circuit breaker of at least: A) 10 A B) 15 A C) 20 A D) 25 A Answer: B Explanation: 2 kW ÷ 208 V = 9.6 A; applying the 125 % continuous load factor yields 12 A, rounded up to the next standard size, 15 A. Question 32. When multiple appliances are grouped on a single branch circuit, the demand factor for the group is applied to: A) The sum of the individual appliance rated currents B) Only the largest appliance in the group C) The total connected load after applying NEC Table 220. D) The total load after applying NEC Table 220. Answer: D Explanation: NEC Table 220.55 provides demand factors for groups of appliances, such as kitchen equipment.
07DAppliance Repairination
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Question 33. For a 240 V commercial water heater with a 30 A marked rating, the required branch-circuit overcurrent device may be: A) 30 A B) 35 A C) 40 A D) 45 A Answer: A Explanation: NEC 422.13 allows the branch-circuit rating to be the marked rating or the next standard size up; 30 A is acceptable. Question 34. The neutral conductor for a 120/240 V commercial dryer supplying a 15 A load must be sized at least: A) #14 AWG B) #12 AWG C) #10 AWG D) #8 AWG Answer: B Explanation: NEC Table 310.15(B)(16) requires #12 AWG copper for a 20 A circuit, which covers the 15 A load and the neutral. Question 35. An appliance motor with a nameplate FLC of 12 A, operating in a 30 °C ambient, must have its branch-circuit OCPD sized to: A) 12 A B) 15 A C) 20 A
07DAppliance Repairination
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Explanation: NEC 210.8(A)(2) mandates GFCI protection for receptacles in the cooking area of a commercial kitchen. Question 38. The maximum length of a flexible cord used to connect a 120 V, 10 A commercial blender to a receptacle is: A) 25 ft B) 30 ft C) 50 ft D) No limit if the cord is rated for the load Answer: A Explanation: NEC 400.5(A)(1) limits flexible cord runs to 25 ft for cord-and-plug connected appliances. Question 39. When bundling more than three current-carrying conductors in a raceway for a commercial oven, the ampacity must be derated by: A) 10 % B) 15 % C) 20 % D) 30 % Answer: B Explanation: NEC Table 310.15(B)(3)(a) requires a 15 % derating for 4- 6 conductors. Question 40. The arc-flash incident energy for a 480 V, 30 A motor starter operating for 0.2 seconds is calculated to be 1.2 cal/cm². According to NFPA 70E, the required PPE category is: A) No PPE required
07DAppliance Repairination
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B) PPE Category 1 C) PPE Category 2 D) PPE Category 3 Answer: B Explanation: NFPA 70E requires PPE Category 2 for incident energy between 1.2 and 4.0 cal/cm²; however the threshold for Category 1 is up to 1.2 cal/cm². Since the value is exactly 1.2 cal/cm², Category 1 is sufficient. Answer: B Explanation: Category 1 PPE is required for incident energies up to and including 1.2 cal/cm². Question 41. A commercial dryer’s disconnect must be locked out during maintenance. Which of the following is the correct method? A) Place a lock on the dryer’s internal fuse only B) Install a lock on the branch-circuit breaker and attach a tag identifying the employee C) Use a padlock on the dryer’s power cord D) Turn off the building’s main service disconnect only Answer: B Explanation: LOTO requires locking the circuit breaker that supplies the equipment and tagging it with the employee’s identification. Question 42. Under Washington State law, a Master Electrician who fails to supervise a trainee’s work on a commercial refrigeration system may be subject to: A) A fine of up to $500 only B) License suspension for up to 90 days
07DAppliance Repairination
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Answer: B Explanation: In a balanced three-phase system, a neutral is not required unless the equipment has a 120 V component. Question 45. The NEC permits the use of a 3-wire (2-hot + ground) cord for a commercial dryer if the dryer is: A) Equipped with a 3-wire plug and no neutral is required for operation B) Connected to a 120/240 V circuit with a neutral present C) Used in a residential setting only D) Rated at less than 10 A Answer: A Explanation: NEC 210.23 allows a 3-wire cord for appliances that do not require a neutral for operation. Question 46. When installing a grounding electrode system for a new commercial kitchen, the minimum number of ground rods required is: A) One, if driven to at least 8 ft depth B) Two, spaced at least 6 ft apart C) Three, regardless of soil conditions D) None, if a metal water pipe is present Answer: B Explanation: NEC 250.53(A)(2) requires at least two ground rods spaced a minimum of 6 ft apart unless a single rod meets the resistance requirement, which is rarely assumed. Question 47. A commercial deep-fat fryer with a 2500 W heating element must be protected by a branch-circuit breaker sized at:
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A) 10 A
B) 15 A
C) 20 A
D) 25 A
Answer: B Explanation: 2500 W ÷ 240 V = 10.4 A; applying the 125 % continuous load factor yields 13 A, rounded up to the next standard size, 15 A. Question 48. The NEC requires that the disconnecting means for a fixed commercial appliance be “in sight” from the appliance. The distance “in sight” is defined as: A) No more than 6 ft B) No more than 10 ft C) Within the same enclosure or a clear line of sight, not exceeding 50 ft D) Within the same room, regardless of distance Answer: C Explanation: “In sight” means the disconnect is visible without opening doors or panels; the NEC does not prescribe a specific distance, but practical interpretation limits it to a clear line of sight, often less than 50 ft. Question 49. Which of the following is a permitted method for grounding a metal-cased commercial freezer that is cord-and-plug connected? A) Connecting the freezer’s frame to the building’s grounding electrode conductor with a #10 AWG wire B) Relying on the equipment grounding conductor in the cord C) Installing a separate grounding rod at the freezer’s location D) No grounding is required if the freezer is double-insulated
