Solution and Answer Guide Illustrated Guide to the National Electrical Code 9th Edition by Charles R. Miller | new update

Solution and AnswerGuide IllustratedGuide to the Natio
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nal Electrical Code 9th Edition by Charles R. Miller
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ILLUSTRATED GUIDE TO THE NATIONAL ELECTRICALCODE, 9TH ED. (C x x x x x x x x x




HARLES R. MILLER) x x




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 x




Rationale:NEC’s scopeis safety— x x x x




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. NFPABoard
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 B. Authority Having Jurisdiction (AHJ)
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 C. Utility company
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 D. OSHAexclusively
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Answer: B x




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 byother 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 x




Rationale:NEC excludes ships, railways, and some communications facilities under
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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 performelectrical 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 x




Rationale:A qualified personhas demonstrated knowledge and training in equipment
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and safety practices.
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Q5. Which term means “an electric circuit including conductors between final overcurr
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ent device and outlet(s)”?
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 A. Feeder
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 B. Branch circuit
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 C. Service conductors
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 D. Equipment grounding conductor
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Answer: B x




Rationale:Branch circuit runs from OCPDto outlets. Feeder runs between OCPD and
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other OCPD.x




Q6. Which color identifies an equipment grounding conductor?
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 A. White
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 B. Green or bare
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,  C. Red
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 D. Blue
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Answer: B x




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 bymanufacturer
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 B. Approved by a qualified testing laboratory like UL
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 C. Chosenby installer
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 D. Recommended byengineer
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Answer: B x




Rationale:“Listed” = evaluated byrecognized independent testing lab.
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Q8. What is the purposeof 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 x




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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, Answer: B x




Rationale:NEC updates on a 3-year cycle.
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Q10. The NEC applies to:
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 A. Design details and costefficiency
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 B. Installation of conductors,equipment, and raceways for safe use
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 C. Manufacturing processes
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 D. Telecom wiring only
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Answer: B x




Rationale:Scopecovers safe installation and use, not cost/design.
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Chapter 2 — Wiring and Protection
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Q1. Minimum size copperconductorfor residential branch circuits:
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 A. 10 AWG
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 B. 14 AWG
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 C. 12 AWG
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 D. 16 AWG
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Answer: B x




Rationale:14 AWG is minimum size permitted for 15 A circuits.
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Q2. Branch circuits supplying receptacles in kitchens must:
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 A. Be one 15 A circuit
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 B. Be at least two 20 A small-appliance circuits
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 C. Share lighting loads
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 D. Use 10 AWG only
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Answer: B x




Rationale:NEC requires at least two 20 A small-appliance circuits for kitchens.
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