,Solution and Answer Guide Illustrated Guide to the N
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ational Electrical Code 9th Edition by Charles R. Mill
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er
ILLUSTRATED GUIDE TO THE NATIONAL ELECTRICAL CODE, 9TH E
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D. (CHARLES R. MILLER)
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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 @p
Rationale: NEC’s scope is safety—
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minimizing risks of fire and shock. It does not address cost or design specific
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s.
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 @p
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 @p
Rationale: NEC excludes ships, railways, and some communications facilities
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under 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 @p
Rationale: A qualified person has demonstrated knowledge and training in equi
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pment and safety practices.
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Q5. Which term means ―an electric circuit including conductors between final o
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vercurrent device and outlet(s)‖?
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A. Feeder @p
B. Branch circuit
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C. Service conductors
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D. Equipment grounding conductor
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Answer: B @p
Rationale: Branch circuit runs from OCPD to outlets. Feeder runs between OC
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PD and other OCPD.
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Q6. Which color identifies an equipment grounding conductor?
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A. White @p
B. Green or bare
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, C. Red
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D. Blue
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Answer: B @p
Rationale: NEC requires green or bare copper for 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 @p
Rationale: ―Listed‖ = evaluated by recognized independent testing lab.
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Q8. What is the purpose of the Nationally Recognized Testing Laboratory (N
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RTL)?
A. Market products
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B. Test and certify products for safety 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 @p
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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@p @p @p @p @p @p @p @p
ational Electrical Code 9th Edition by Charles R. Mill
@p @p @p @p @p @p @p @p
er
ILLUSTRATED GUIDE TO THE NATIONAL ELECTRICAL CODE, 9TH E
@p @p @p @p @p @p @p @p
D. (CHARLES R. MILLER)
@p @p @p
Chapter 1 — General
@p @p @p
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 @p
Rationale: NEC’s scope is safety—
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minimizing risks of fire and shock. It does not address cost or design specific
@ p @p @p @p @p @p @p @p @p @p @p @p @p
s.
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 @p
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 @p
Rationale: NEC excludes ships, railways, and some communications facilities
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under 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 @p
Rationale: A qualified person has demonstrated knowledge and training in equi
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pment and safety practices.
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Q5. Which term means ―an electric circuit including conductors between final o
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vercurrent device and outlet(s)‖?
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A. Feeder @p
B. Branch circuit
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C. Service conductors
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D. Equipment grounding conductor
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Answer: B @p
Rationale: Branch circuit runs from OCPD to outlets. Feeder runs between OC
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PD and other OCPD.
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Q6. Which color identifies an equipment grounding conductor?
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A. White @p
B. Green or bare
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, C. Red
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D. Blue
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Answer: B @p
Rationale: NEC requires green or bare copper for 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 @p
Rationale: ―Listed‖ = evaluated by recognized independent testing lab.
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Q8. What is the purpose of the Nationally Recognized Testing Laboratory (N
@p @p @p @p @p @p @p @ p @p @p @p
RTL)?
A. Market products
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B. Test and certify products for safety 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 @p
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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