Test Bank and Solution and Answer Guide Illustrated Guide to the National Electrical Code 9th Edition by Charles R. Miller

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Test Bank Solution and Answer Guide Illustrated Guide to the National Electrical Code 9th Edition by Charles R. Miller Chapter 1 — General Q1. The NEC is primarily intended to:  A. Ensure efficie ... ncy 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:  A. 2 years  B. 3 years  C. 5 years  D. 10 years Answer: B Rationale: NEC updates on a 3-year cycle. Q10. The NEC applies to:  A. Design details and cost efficiency  B. Installation of conductors, equipment, and raceways for safe use  C. Manufacturing processes  D. Telecom wiring only Answer: B Rationale: Scope covers safe installation and use, not cost/design. Chapter 2 — Wiring and Protection Q1. Minimum size copper conductor for residential branch circuits:  A. 10 AWG  B. 14 AWG  C. 12 AWG  D. 16 AWG Answer: B Rationale: 14 AWG is minimum size permitted for 15 A circuits. Q2. Branch circuits supplying receptacles in kitchens must:  A. Be one 15 A circuit  B. Be at least two 20 A small-appliance circuits  C. Share lighting loads  D. Use 10 AWG only Answer: B Rationale: NEC requires at least two 20 A small-appliance circuits for kitchens. Q3. Overcurrent protection for continuous loads must be:  A. 100% of load  B. 125% of load  C. 80% of load  D. 150% of load Answer: B Rationale: NEC requires 125% for continuous loads to prevent overheating. Q4. Conductors supplying a single motor are protected against:  A. Short circuit and overload by branch OCPD  B. Overload by motor OCPD, short circuit by branch OCPD  C. Ground fault only  D. Voltage drop only Answer: B Rationale:Branch OCPD protects against short circuit/ground fault; motor overload device protects against overload. Q5. Ground-fault circuit interrupters (GFCIs) protect against:  A. Overheating  B. Shock hazards from ground-fault current  C. Overvoltage  D. Short-circuit currents only Answer: B Rationale: GFCIs trip when detecting leakage to ground to prevent shock. Q6. Minimum burial depth of direct-buried conductors under residential driveways:  A. 12 in.  B. 18 in.  C. 24 in.  D. 30 in. Answer: C Rationale: NEC requires 24 in. burial depth under driveways unless using special wiring methods. [Show More]

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