"Illustrated Guide to the National Electrical Code: Solutions and Answer Guide (9th Edition)" By Charles R. Miller

Solution and Answers Guide *Chapter 1 — General Q1. The NEC is primarily intended to: • A. Ensure efficiency of electrical systems • B. Provide safety from electrical hazards • C. Establish pricing for equipment • D. Define design details for engineers Answer: B Rationale: NEC’s scope is safety—minimizing risks of fire and shock. It does not address cost or design specifics. Q2. Which authority enforces the NEC locally? • A. NFPA Board • B. Authority Having Jurisdiction (AHJ) • C. Utility company • D. OSHA exclusively Answer: B Rationale: The AHJ interprets and enforces the NEC, often local inspectors. Q3. Which of the following is not covered by the NEC? • A. Marine installations regulated by other codes • B. Dwelling units • C. Commercial occupancies • D. Industrial occupancies Answer: A Rationale: NEC excludes ships, railways, and some communications facilities under other regulations. Q4. The NEC defines a “qualified person” as: • A. Anyone with electrical knowledge • B. An individual with skills and safety training to perform electrical tasks • C. A licensed engineer only • D. A certified inspector only Answer: B Rationale: A qualified person has demonstrated knowledge and training in equipment and safety practices. Q5. Which term means “an electric circuit including conductors between final overcurrent device and outlet(s)”? • A. Feeder • B. Branch circuit • C. Service conductors • D. Equipment grounding conductor Answer: B Rationale: Branch circuit runs from OCPD to outlets. Feeder runs between OCPD and other OCPD. Q6. Which color identifies an equipment grounding conductor? • A. White • B. Green or bare • C. Red • D. Blue Answer: B Rationale: NEC requires green or bare copper for equipment grounding. Q7. What does the NEC consider “listed” equipment? • A. Approved only by manufacturer • B. Approved by a qualified testing laboratory like UL • C. Chosen by installer • D. Recommended by engineer Answer: B Rationale: “Listed” = evaluated by recognized independent testing lab. Q8. What is the purpose of the Nationally Recognized Testing Laboratory (NRTL)? • A. Market products • B. Test and certify products for safety compliance • C. Issue installation permits • D. Enforce NEC in the field Answer: B Rationale: NRTLs verify that products meet standards for safe installation. Q9. The NEC is revised every: