Download Clay County Master Electrician Exam 2017: Practice Questions and Answers and more Exams Technology in PDF only on Docsity!
(ENGLISH OR SPANISH) 2017 Exam
Question 1. What is the primary purpose of the National Electrical Code (NEC)? A) To regulate utility company operations B) To ensure safe electrical installations C) To increase electrical contractor profits D) To standardize wire colors internationally Answer: B Explanation: The NEC is designed to safeguard people and property from hazards arising from the use of electricity, ensuring safety in electrical installations. Question 2. According to NEC Article 90, which word indicates a mandatory rule?
(ENGLISH OR SPANISH) 2017 Exam
A) May B) Should C) Shall D) Might Answer: C Explanation: The word "shall" in the NEC denotes a mandatory requirement that must be followed. Question 3. Who is responsible for interpreting the requirements of the NEC on a job site? A) The homeowner B) The Authority Having Jurisdiction (AHJ) C) The manufacturer
(ENGLISH OR SPANISH) 2017 Exam
Explanation: "Shall be permitted" means the NEC allows the practice, but it is not required. Question 5. Which of the following best defines "grounded conductor" as per NEC? A) The uninsulated wire B) The wire connected to earth C) The conductor connected to the neutral point D) The hot wire Answer: C Explanation: A grounded conductor is typically the neutral wire, connected to the neutral point of a system.
(ENGLISH OR SPANISH) 2017 Exam
Question 6. What is the minimum working space required in front of electrical equipment (600V or less)? A) 2 feet B) 3 feet C) 4 feet D) 6 feet Answer: B Explanation: NEC 110.26(A) requires at least 3 feet of working space in front of equipment. Question 7. Which of the following is NOT a reason for providing working space around electrical equipment? A) Heat dissipation
(ENGLISH OR SPANISH) 2017 Exam
Answer: B Explanation: Live parts over 50 volts must be guarded to prevent accidental contact. Question 9. How should disconnecting means be identified? A) By color only B) By location only C) By a durable and legible marking D) By wire size Answer: C Explanation: Disconnects must be clearly and permanently marked for identification.
(ENGLISH OR SPANISH) 2017 Exam
Question 10. What is the minimum headroom required above working space for electrical equipment? A) 4 feet B) 5 feet C) 6.5 feet D) 8 feet Answer: C Explanation: NEC 110.26(E) requires at least 6.5 feet of headroom. Question 11. Which is a key component of the definition of "qualified person" in the NEC? A) Holds a master’s degree
(ENGLISH OR SPANISH) 2017 Exam
Answer: B Explanation: RMC is a type of raceway; cables like NM and AC are not. Question 13. Which color is typically used for grounded conductors (neutral) in residential wiring? A) Black B) Red C) Green D) White Answer: D Explanation: The NEC designates white or gray for grounded (neutral) conductors.
(ENGLISH OR SPANISH) 2017 Exam
Question 14. What is the maximum number of 12 AWG conductors allowed in a standard 4"x2-1/8" (1900) box? A) 6 B) 9 C) 12 D) 18 Answer: B Explanation: Box fill calculations per NEC Table 314.16(B) allow for 9 12 AWG conductors. Question 15. Which of the following is NOT permitted for use as a grounding electrode? A) Metal underground water pipe (10 ft or more)
(ENGLISH OR SPANISH) 2017 Exam
Answer: B Explanation: Flexible cords are only allowed in temporary lighting and similar permitted uses. Question 17. What is the minimum burial depth for a direct-buried cable under a residential driveway? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: C Explanation: NEC Table 300.5 requires 18 inches of cover for direct- buried cables under driveways.
(ENGLISH OR SPANISH) 2017 Exam
Question 18. Which raceway type is permitted for use in wet locations? A) Electrical metallic tubing (EMT) B) Flexible metallic conduit (FMC) C) Rigid nonmetallic conduit (RNC) D) Armored cable (AC) Answer: C Explanation: RNC is designed for wet locations; others may be limited or prohibited. Question 19. A device intended to open a circuit under abnormal current is called: A) Switch
(ENGLISH OR SPANISH) 2017 Exam
Answer: B Explanation: NEC Table 310.15(B)(16) lists 20A for 12 AWG copper at 60°C. Question 21. Which conductor insulation type is suitable for wet locations? A) THW B) TW C) THHN D) UF Answer: A Explanation: THW is rated for wet locations; THHN is for dry or damp unless dual rated.
(ENGLISH OR SPANISH) 2017 Exam
Question 22. When are AFCIs required in dwelling unit bedrooms? A) Only for outlets B) For all branch circuits supplying outlets C) For lighting only D) Never required Answer: B Explanation: NEC requires AFCI protection for all 120V, 15 and 20A branch circuits in bedrooms. Question 23. What is the maximum voltage drop recommended for branch circuits? A) 2%
(ENGLISH OR SPANISH) 2017 Exam
Answer: A Explanation: NEC Table 250.66 requires 4 AWG copper for 200A services. Question 25. The NEC requires that all conductors of a circuit be: A) The same color B) Run together in the same raceway or cable C) Rated for 600V D) Labeled every 6 feet Answer: B Explanation: For safety and proper operation, all circuit conductors must be grouped together.
(ENGLISH OR SPANISH) 2017 Exam
Question 26. Which of the following is NOT an acceptable method for identifying the high-leg conductor in a 4-wire delta system? A) Orange insulation B) Marking with orange tape C) Green insulation D) Tagging with "high leg" label Answer: C Explanation: Green is reserved for equipment grounding conductors. Question 27. What minimum clearance is required from the bottom of a panelboard to the floor? A) 3 inches B) 6 inches
