Illustrated Guide to the National Electrical Code (NEC), 9th Edition – Charles R. Miller – 2024 – Complete Chapter 1–19 Exam Answer Guide

,Solution and Answer Guide Illustrated Guide to the Nat
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ional Electrical Code 9th Edition by Charles R. Miller
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ILLUSTRATED GUIDE TO THE NATIONAL ELECTRICAL CODE, 9TH ED.
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(CHARLES R. MILLER) s1 s1




Chapter 1 — General
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Q1. The NEC is primarily intended to:
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 A. Ensure efficiency of electrical systems
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 B. Provide safety from electrical hazards
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 C. Establish pricing for equipment
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 D. Define design details for engineers
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Answer: B s1



Rationale: NEC’s scope is safety—
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minimizing risks of fire and shock. It does not address cost or design specifics.
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Q2. Which authority enforces the NEC locally?
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 A. NFPA Board
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 B. Authority Having Jurisdiction (AHJ)
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 C. Utility company
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 D. OSHA exclusively
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Answer: B s1



Rationale: The AHJ interprets and enforces the NEC, often local inspectors.
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Q3. Which of the following is not covered by the NEC?
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 A. Marine installations regulated by other codes
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 B. Dwelling units
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,  C. Commercial occupancies
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 D. Industrial occupancies
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Answer: A s1



Rationale: NEC excludes ships, railways, and some communications facilities und
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er other regulations.
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Q4. The NEC defines a ―qualified person‖ as:
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 A. Anyone with electrical knowledge
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 B. An individual with skills and safety training to perform electrical tasks
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 C. A licensed engineer only
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 D. A certified inspector only
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Answer: B s1



Rationale: A qualified personhas demonstrated knowledge and training in equipm
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ent and safety practices.
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Q5. Which term means ―an electric circuit including conductors between final overc
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urrent device and outlet(s)‖?
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 A. Feeders1




 B. Branch circuit
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 C. Service conductors
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 D. Equipment grounding conductor
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Answer: B s1



Rationale: Branch circuit runs from OCPD to outlets. Feeder runs between OCPD
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and other OCPD.
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Q6. Which color identifies an equipment grounding conductor?
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 A. White s1




 B. Green or bare
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,  C. Reds1




 D. Blue
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Answer: B s1



Rationale: NEC requires green or bare copperfor equipment grounding.
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Q7. What does the NEC consider ―listed‖ equipment?
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 A. Approved only by manufacturer
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 B. Approved by a qualified testing laboratory like UL
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 C. Chosen by installer
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 D. Recommended by engineer
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Answer: B s1



Rationale: ―Listed‖ = evaluated by recognized independent testing lab.
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Q8. What is the purpose of the Nationally Recognized Testing Laboratory (NRTL)
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?
 A. Market products
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 B. Test and certify products forsafety compliance
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 C. Issue installation permits
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 D. Enforce NEC in the field
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Answer: B s1



Rationale: NRTLs verify that products meet standards for safe installation.
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Q9. The NEC is revised every:
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 A. 2 years
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 B. 3 years
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 C. 5 years
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 D. 10 years
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