Download PrepIQ WA Master Electrician 02Residentialination Ultimate Exam and more Exams Technology in PDF only on Docsity!
02Residentialination Ultimate
Exam
Question 1. Under RCW 19.28-101, which individual must hold a Washington State electrician license to perform electrical work on a new residential dwelling? A) Any person with a high-school diploma B) A licensed electrician or a registered electrical contractor C) The homeowner, if they are present on site D) An apprentice with a supervisor present Answer: B Explanation: RCW 19.28-101 requires that only a licensed electrician or a registered electrical contractor may perform electrical work on new residential construction in Washington. Question 2. WAC 296-46B-210 adds a state-specific requirement for AFCI protection. In which location is AFCI protection mandatory for a new single-family home in Washington? A) All 120 V 15-A receptacles in the kitchen B) All 120 V 20-A receptacles in the garage C) All 120 V receptacles in bedrooms and living areas D) Only receptacles serving dedicated appliance circuits Answer: C Explanation: Washington’s amendment requires AFCI protection for all 120 V receptacles in bedrooms and living areas, aligning with NEC 210.12 but extending the requirement statewide.
02Residentialination Ultimate
Exam
Question 3. Which of the following is a correct definition according to WAC 296-46B-010? A) “Tamper-Resistant Receptacle” – a receptacle that cannot be opened by a standard screwdriver. B) “Qualified Person” – any individual who has completed an apprenticeship. C) “Service Entrance” – the point where the utility’s service conductors connect to the building’s wiring. D) “Ground Fault Circuit Interrupter” – a device that trips on any overload condition. Answer: C Explanation: The term “Service Entrance” is defined in the WAC as the point where the utility’s service conductors enter the building and connect to the internal wiring. Question 4. Article 210.52 of the NEC specifies the minimum number of receptacles required in a dwelling unit’s kitchen countertop space. For a countertop that is 12 ft long, how many receptacles are required? A) 2 B) 3 C) 4 D) 5 Answer: B Explanation: NEC 210.52(A)(1) requires at least one receptacle outlet for every 12 ft of countertop length, so a 12-ft countertop needs at least two receptacles; however, the minimum is one per wall space, resulting in a total
02Residentialination Ultimate
Exam
Question 7. According to NEC 310.15(B)(3)(a), what adjustment factor is applied when four current-carrying conductors are installed in a single raceway? A) 80 % B) 70 % C) 85 % D) 90 % Answer: A Explanation: The NEC requires a 80 % adjustment factor when there are more than three current-carrying conductors in a raceway. Question 8. Which of the following is the correct burial depth for a 12 - AWG NM cable installed in a residential driveway trench without additional protection? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: B Explanation: NEC 300.5(B)(1) requires a minimum burial depth of 12 inches for NM cable in a residential driveway trench when not protected by a conduit.
02Residentialination Ultimate
Exam
Question 9. For a grounding electrode system, which of the following materials is not acceptable as a grounding electrode according to NEC 250.52? A) Concrete-encased electrode (“Ufer”) B) Ground-ring made of copper-clad steel C) Aluminum pipe buried in the earth D) Steel water pipe with a bonding jumper Answer: C Explanation: Aluminum is not listed as an acceptable grounding electrode material in NEC 250.52. Question 10. In a residential service panel, the main disconnecting means must be rated for at least what percentage of the calculated load? A) 80 % B) 100 % C) 125 % D) 150 % Answer: B Explanation: NEC 230.82 requires the service disconnect to be rated for at least the calculated load; no additional safety factor is applied at the service disconnect. Question 11. Which of the following statements about tamper-resistant receptacles (TRRs) in Washington State is correct? A) TRRs are required in all receptacles throughout a dwelling.
02Residentialination Ultimate
Exam
C) 3
D) 4
Answer: B Explanation: NEC requires at least two 20-A small-appliance circuits for the kitchen countertop. Question 14. Under RCW 19.28-124, what is the maximum penalty for performing electrical work without a license in Washington? A) $500 fine B) $1,000 fine C) $5,000 fine D) $10,000 fine Answer: D Explanation: The statute sets a maximum civil penalty of $10,000 for unlicensed electrical work. Question 15. Which of the following is the correct ampacity for a 4-AWG copper conductor with 75 °C insulation used in a residential feeder, per NEC 310.15(B)(16)? A) 55 A B) 70 A C) 85 A D) 95 A
02Residentialination Ultimate
Exam
Answer: C Explanation: Table 310.15(B)(16) lists 4-AWG copper with 75 °C insulation at 85 A. Question 16. An electrician needs to install a grounding electrode conductor (GEC) to a concrete-encased electrode. What minimum size copper conductor is required if the service is protected by a 200 A breaker? A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: B Explanation: NEC 250.122 requires a #6 AWG copper GEC for a 200 A overcurrent device. Question 17. Which of the following is not a permissible method for protecting a service-entrance cable (SE) as it enters a dwelling? A) Direct burial in earth at 12 inches depth B) Running through a metal raceway C) Securing with a listed cable clamp within 12 inches of the entry point D) Exposing the cable on the exterior wall without conduit Answer: D Explanation: SE cable must be protected from physical damage; exposing it on an exterior wall without a conduit is not permitted.
02Residentialination Ultimate
Exam
Question 20. When calculating voltage drop for a 120 V circuit supplying a 1,500 W load located 80 ft from the panel, which of the following is the closest acceptable voltage drop percentage? A) 0.5 % B) 1 % C) 2 % D) 3 % Answer: C Explanation: NEC recommends a maximum of 3 % voltage drop for branch circuits; for a 1,500 W load at 80 ft, a typical calculation yields about 2 % drop, which is acceptable. Question 21. Washington State requires a “Right of Entry” permit for inspectors. Which of the following statements best describes this right? A) Inspectors may enter any private residence at any time without notice. B) Inspectors must be given at least 24 hours written notice before entry. C) Inspectors may enter the premises during reasonable hours after being notified of the work. D) Inspectors can only enter if the homeowner is present. Answer: C Explanation: RCW 19.28-108 provides inspectors the right to enter during reasonable hours after being notified of the work being performed. Question 22. Which of the following is a correct description of a “dedicated equipment space” as defined in NEC 110.26?
02Residentialination Ultimate
Exam
A) A space where any equipment can be installed without clearance. B) A space reserved for a single piece of equipment that must have clear working space around it. C) A location where multiple appliances share a common grounding conductor. D) A hallway area where lighting fixtures are installed. Answer: B Explanation: NEC 110.26 defines a dedicated equipment space as an area reserved for a single piece of equipment, requiring specific clearances for safe operation and maintenance. Question 23. In a residential panel, the neutral bus bar is required to be bonded to the grounding bus bar at which point? A) At the service disconnect only B) At every subpanel C) Only when the system is grounded with a concrete-encased electrode D) Never, they must remain isolated Answer: A Explanation: NEC 250.24(A) requires bonding of neutral and grounding at the service disconnect only; subpanels must keep them isolated. Question 24. Which of the following is the correct minimum size for a grounding electrode conductor (GEC) when connecting to a 4-AWG copper service-entrance conductor protected by a 100 A breaker? A) #10 AWG copper
02Residentialination Ultimate
Exam
Answer: A Explanation: NEC requires GFCI protection for all bathroom receptacles; AFCI is not required unless the area also falls under living-area requirements. Question 27. A residential dryer circuit is supplied by a 30 A double-pole breaker. What is the minimum size copper conductor that can be used for this feeder according to NEC 310.15(B)(16)? A) #12 AWG B) #10 AWG C) #8 AWG D) #6 AWG Answer: C Explanation: The ampacity table shows #8 AWG copper with 75 °C rating is rated for 50 A, which comfortably exceeds the 30 A requirement. Question 28. Which of the following is not a permitted method for installing a grounding electrode in a new residential foundation? A) Driving a 5-ft copper-clad steel rod into the earth near the foundation B) Installing a 20-ft copper-bonded pipe encased in concrete C) Using a 4-ft length of 4/0 copper ground rod placed on the slab surface D) Installing a steel rebar that is part of the structural reinforcement and bonding it to the grounding system Answer: C
02Residentialination Ultimate
Exam
Explanation: A 4-ft ground rod does not meet the minimum 8-ft length requirement for a ground rod; also, a rod placed on a slab surface is not considered a proper grounding electrode. Question 29. According to NEC 210.12(B), which of the following dwelling areas must have AFCI protection for all 120 V branch circuits? A) Kitchen countertops only B) Bathrooms only C) Bedrooms, living rooms, and hallways D) Garages and unfinished basements Answer: C Explanation: NEC 210.12(B) requires AFCI protection for all 120 V branch circuits supplying outlets in bedrooms, living rooms, and hallways. Question 30. Under Washington State law, which of the following actions can result in the suspension of an electrical contractor’s license? A) Failure to renew the license within 30 days of expiration B) Submitting a completed continuing education report C) Performing work that exceeds the contractor’s license classification D) Hiring an apprentice without a signed apprenticeship agreement Answer: C Explanation: Performing work beyond the scope of the contractor’s license classification is a ground for suspension under RCW 19.28-140.
02Residentialination Ultimate
Exam
A) The conduit must be bonded at each end with a bonding jumper. B) The conduit may serve as the equipment grounding conductor without additional bonding. C) The conduit must be painted to prevent corrosion. D) The conduit must be installed with a minimum of 6 inches of slack. Answer: B Explanation: Metal raceways such as EMT are permitted to serve as the equipment grounding conductor when properly installed and bonded. Question 34. Which of the following is the correct minimum size for a grounding electrode conductor (GEC) attached to a 150 A service? A) #10 AWG copper B) #8 AWG copper C) #6 AWG copper D) #4 AWG copper Answer: C Explanation: NEC 250.122 requires a #6 AWG copper GEC for a 150 A overcurrent device. Question 35. Under NEC 210.52(B)(2), how many 20-A receptacle outlets are required in a dining room that is 15 ft long? A) 1 B) 2 C) 3
02Residentialination Ultimate
Exam
D) 4
Answer: B Explanation: The code requires one receptacle outlet for every 12 ft of wall space in dining areas; a 15-ft room thus needs at least two receptacles. Question 36. Which of the following is a permissible method for protecting a 12-AWG NM cable that passes through a concrete slab? A) Installing the cable directly through the slab without protection. B) Using a listed conduit sleeve with a minimum 1-in. clearance on each side. C) Embedding the cable in the slab and covering it with a 2-in. layer of concrete. D) Running the cable in a metal raceway that is not sealed. Answer: B Explanation: NEC 300.5 requires protection for cables that penetrate concrete; a listed conduit sleeve with proper clearance is acceptable. Question 37. In Washington State, what is the maximum allowable voltage for a “low-voltage” lighting system that does not require a permit? A) 30 V AC B) 50 V AC C) 60 V DC D) 120 V AC Answer: B
02Residentialination Ultimate
Exam
Question 40. When performing a load calculation for a dwelling unit, which of the following appliances is not included in the general lighting and receptacle load per NEC 220.42? A) Electric dryer B) Bathroom vanity lights C) Kitchen countertop receptacles D) Hallway lighting Answer: A Explanation: Large appliances like dryers are calculated separately under Article 220, not included in the general lighting and receptacle load. Question 41. Which of the following is the correct minimum size for a grounding electrode conductor (GEC) when the service is protected by a 400 A breaker? A) #6 AWG copper B) #4 AWG copper C) #2 AWG copper D) 1/0 AWG copper Answer: D Explanation: NEC 250.122 specifies a 1/0 AWG copper GEC for a 400 A service. Question 42. In a residential installation, a 20-A circuit supplies a bathroom vanity. Which of the following devices must be installed to meet NEC requirements?
02Residentialination Ultimate
Exam
A) A standard receptacle with a resettable fuse B) A GFCI receptacle or GFCI breaker C) An AFCI receptacle only D) No special device is required Answer: B Explanation: NEC 210.8(A)(1) mandates GFCI protection for bathroom receptacles. Question 43. According to NEC 300.22, where must a raceway be installed when crossing a grounded metal water pipe? A) Directly on the pipe without any protection B) Through a listed fitting that provides a 2-in. clearance C) With a non-metallic raceway only D) It is prohibited to cross a grounded metal water pipe Answer: B Explanation: NEC 300.22 requires a 2-in. clearance around grounded metal water pipes when raceways cross them, unless a listed fitting provides protection. Question 44. Which of the following best describes the purpose of the “Right of Entry” permit required by WAC 296-46B-901? A) To allow the electrician to install equipment without inspection. B) To authorize the building owner to waive all inspection fees.
