,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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s1 s1 s1 s1 s1 s1 s1 s1
ional Electrical Code 9th Edition by Charles R. Miller
s1 s1 s1 s1 s1 s1 s1 s1
ILLUSTRATED GUIDE TO THE NATIONAL ELECTRICAL CODE, 9TH ED.
s1 s1 s1 s1 s1 s1 s1 s1 s1
(CHARLES R. MILLER) s1 s1
Chapter 1 — General
s1 s1 s1
Q1. The NEC is primarily intended to:
s1 s1 s1 s1 s1 s1
A. Ensure efficiency of electrical systems
s1 s1 s1 s1 s1
B. Provide safety from electrical hazards
s1 s1 s1 s1 s1
C. Establish pricing for equipment
s1 s1 s1 s1
D. Define design details for engineers
s1 s1 s1 s1 s1
Answer: B s1
Rationale: NEC’s scope is safety—
s1 s1 s1 s1
minimizing risks of fire and shock. It does not address cost or design specifics.
s 1 s1 s1 s1 s1 s1 s1 s1 s1 s1 s1 s1 s1
Q2. Which authority enforces the NEC locally?
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A. NFPA Board
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B. Authority Having Jurisdiction (AHJ)
s1 s1 s1 s1
C. Utility company
s1 s1
D. OSHA exclusively
s1 s1
Answer: B s1
Rationale: The AHJ interprets and enforces the NEC, often local inspectors.
s1 s1 s1 s1 s1 s1 s1 s1 s1 s1
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
s1 s1 s1 s1 s1 s1 s1 s1 s1
er other regulations.
s1 s1
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
s1 s1 s1 s1 s1 s1 s1 s1 s 1 s1
ent and safety practices.
s 1 s1 s1
Q5. Which term means ―an electric circuit including conductors between final overc
s1 s1 s1 s1 s1 s1 s1 s1 s1 s1 s1
urrent device and outlet(s)‖?
s1 s1 s1
A. Feeders1
B. Branch circuit
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C. Service conductors
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D. Equipment grounding conductor
s1 s1 s1
Answer: B s1
Rationale: Branch circuit runs from OCPD to outlets. Feeder runs between OCPD
s1 s1 s1 s1 s1 s1 s1 s1 s1 s1 s1 s1
and other OCPD.
s1 s1
Q6. Which color identifies an equipment grounding conductor?
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A. White s1
B. Green or bare
s1 s1 s1
, C. Reds1
D. Blue
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Answer: B s1
Rationale: NEC requires green or bare copperfor equipment grounding.
s1 s1 s1 s1 s1 s1 s1 s1 s1
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
s1 s1 s1 s1 s1 s1 s1 s1
C. Chosen by installer
s1 s1 s1
D. Recommended by engineer
s1 s1 s1
Answer: B s1
Rationale: ―Listed‖ = evaluated by recognized independent testing lab.
s1 s1 s1 s1 s1 s1 s1 s1
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
s1 s1 s1 s1 s1 s1 s1
C. Issue installation permits
s1 s1 s 1
D. Enforce NEC in the field
s1 s1 s1 s1 s1
Answer: B s1
Rationale: NRTLs verify that products meet standards for safe installation.
s1 s1 s1 s1 s1 s1 s1 s1 s1
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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