Illustrated Guide to the National Electrical Code (NEC), 9th Edition – Charles R. Miller – 2024 – Complete Chapter 1–19 Exam Answer Guide

Solution hand hAnswer hGuide: hMiller/Sandefur, hIllustrated hGuide hto hthe hNEC®, h©2024, h9780357766712, hUnit h1: hIntroduction hto hthe hNational hElectrical hCode®



Solution and Answer Guide h h h



MILLER/SANDEFUR, ILLUSTRATED GUIDE TO THE NEC®, 21E, ©2024, 9780357766712; UNIT 1:
H H H H H H H H H H



INTRODUCTION TO THE NATIONAL ELECTRICAL CODE®
H H H H H H




TABLE OF CONTENTS H H




Unit 1 Competency Test.............................................................................................................................. 1
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UNIT 1 COMPETENCY TEST
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1. The National Fire Protection Association has acted as sponsor of the National Electrical
h h h h h h h h h h h h


Code since
h h .
a. NEC® Reference: Page 1 h h h


b. Answer: 1911 h




2. Informative Annex provides a list of product safety standards used for
h h h h h h h h h h h


product listing where that listing is required by the NEC.
h h h h h h h h h h


a. NEC® Reference: Informative Annex A h h h h


b. Answer: A h




3. Which chapters in the NEC apply generally to all installations?
h h h h h h h h h


a. NEC® Reference: 90.3 h h


b. Answer: Chapters 1, 2, 3, and 4 h h h h h h




4. Every three years, the National Electrical Code is revised, but the Code has only been on a
h h h h h h h h h h h h h h h h


three-year revision cycle since
h h . h h h


a. NEC® Reference: Page 1 h h h


b. Answer: 1975 h




5. The purpose of the National Electrical Code is the practical safeguarding of
h h h h h h h h h h h h


from hazards arising from the use of electricity.
h h h h h h h h


a. NEC® Reference: persons and property h h h h


b. Answer: 90.2(A) h




6. The original Code document was developed
h h in as a result of the united
h h h h h h h h h h h


efforts of various insurance, electrical, architectural, and allied interests.
h h h h h h h h h


a. NEC® Reference: Page 1 h h h


b. Answer: 1897 h




© h2024 hCengage. hAll hRights hReserved. hMay hnot hbe hscanned, hcopied hor hduplicated, hor hposted hto ha hpublicly haccessible 1
website, hin hwhole hor hin hpart.

,Solution hand hAnswer hGuide: hMiller/Sandefur, hIllustrated hGuide hto hthe hNEC®, h©2024, h9780357766712, hUnit h1: hIntroduction hto hthe hNational hElectrical hCode®

7. Informative annexes are not part of the requirements of the NEC but are included for
h h h h h h h h h h h h h h


only. h


a. NEC® Reference: 90.3 h h


b. Answer: informational purposes h h




8. What city was home to the first central-station electric generating plant developed by
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Thomas A. Edison?
h h h


a. NEC® Reference: Page 2 h h h


b. Answer: New York City h h h




9. Chapter h consists of tables that are applicable as referenced. h h h h h h h h


a. NEC® Reference: 90.3 h h


b. Answer: 9 h




10. In the NEC, UL is the abbreviation for
h h h h .h h h h


a. NEC® Reference: Annex I, footnote under Table I.3
h h h h h h h


b. Answer: Underwriters Laboratories h h




11. Equipment that is listed, labeled, or both, or identified for a use shall be installed
h h h h h h h h h h h h h h


and used in accordance with any
h h h h included in the listing, labeling, or
h h h h h h h h h


identification.
h


a. NEC® Reference: 110.3(B) h h


b. Answer: instructions h




© h2024 hCengage. hAll hRights hReserved. hMay hnot hbe hscanned, hcopied hor hduplicated, hor hposted hto ha hpublicly haccessible 2
website, hin hwhole hor hin hpart.

, Solution hand hAnswer hGuide: hMiller/Sandefur, hIllustrated hGuide hto hthe hNEC®, h©2024, h9780357766712, hUnit h2: hDefinitions®



Solution and Answer Guide h h h



MILLER/SANDEFUR, ILLUSTRATED GUIDE TO THE NEC®, 21E, ©2024, 9780357766712;
H H H H H H H H



UNIT 2: DEFINITIONS®
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TABLE OF CONTENTS H H




Unit 2 Competency Test.............................................................................................................................. 1
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UNIT 2 COMPETENCY TEST H H H




1. A(n) branch circuit supplies two or more receptacles or outlets for
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lighting and appliances.
h h h


a. NEC® Reference: Article 100 (Branch-Circuit, General Purpose)
h h h h h h


b. Answer: general purpose h h




2. is the largest amount of current capable of being delivered at a
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point on the electrical system during a short-circuit condition.
h h h h h h h h h


a. NEC® Reference: Article 100 (Fault Current, Available)
h h h h h h


b. Answer: Available fault current h h h




3. A(n) branch circuit consists of two or more ungrounded conductors
h h h h h h h h h h


having a potential difference between them, and a grounded conductor having equal
h h h h h h h h h h h h


potential difference between it and each ungrounded conductor of the circuit and that is
h h h h h h h h h h h h h h


connected to the neutral or grounded conductor of the system.
h h h h h h h h h h


a. NEC® Reference: multiwire h h


b. Answer: Article 100 (Branch-Circuit, Multiwire) h h h h




4. An intermittent operation in which load conditions are regularly recurrent is the definition
h h h h h h h h h h h h


of h h .
a. NEC® Reference: Article 100 (Duty, Periodic) h h h h h


b. Answer: periodic duty h h




5. The is the connection between the grounded-circuit conductor and
h h h h h h h h h


the equipment grounding conductor at the service.
h h h h h h h


a. NEC® Reference: Article 100 (Bonding Jumper, Main) h h h h h h


b. Answer: main bonding jumper h h h




© h2024 hCengage. hAll hRights hReserved. hMay hnot hbe hscanned, hcopied hor hduplicated, hor hposted hto ha hpublicly haccessible 1
website, hin hwhole hor hin hpart.

, Solution hand hAnswer hGuide: hMiller/Sandefur, hIllustrated hGuide hto hthe hNEC®, h©2024, h9780357766712, hUnit h2: hDefinitions®

6. A(n) h is used to connect the system grounded conductor or h h h h h h h h h


the equipment to a grounding electrode or to a point on the grounding electrode
h h h h h h h h h h h h h h


system.
h


a. NEC® Reference: Article 100 (Grounding Electrode Conductor)
h h h h h h


b. Answer: grounding electrode conductor h h h




7. Rainproof, raintight, or watertight equipment can fulfill the requirements for
h h h h h h h h h


where varying weather conditions other than wetness, such h h h h h h h h


as snow, ice, dust, or temperature extremes, are not a factor.
h h h h h h h h h h h


a. NEC® Reference: Article 100 (Weatherproof: Informational Note)
h h h h h h


b. Answer: weatherproof h




8. A(n) h is an intentionally constructed, low-impedance electrically h h h h h h


conductive path designed and intended to carry current during ground-fault events
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from the point of a ground fault on a wiring system to the electrical supply source and
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that facilitates the operation of the overcurrent protective device or ground-fault
h h h h h h h h h h h


detectors.
h


a. NEC® Reference: Article 100 (Ground Fault Current Path, Effective)
h h h h h h h h


b. Answer: effective ground-fault current path h h h h




9. A(n) h is a manual, nonautomatic, or automatic operated device used h h h h h h h h h


in conjunction with a transfer switch to provide a means of directly connecting load
h h h h h h h h h h h h h h


conductors to a power source and of disconnecting the transfer switch.
h h h h h h h h h h h


a. NEC® Reference: Article 100 (Transfer Switch, Bypass Isolation)
h h h h h h h


b. Answer: bypass isolation transfer switch h h h h




10. A surface, flush, or freestanding assemblage with a raceway, fittings, or other enclosure
h h h h h h h h h h h h


hprovided with one or more receptacles, for the purpose of supplying power to
h h h h h h h h h h h h


hutilization equipment is called a(n).
h h h h


a. NEC® Reference: Article 100 (Multioutlet Assembly)
h h h h h


b. Answer: multioutlet assembly h h




11. A raceway encased in 4 in. (102 mm) of concrete on the ground floor (in direct contact
h h h h h h h h h h h h h h h h


hwith the earth) shall be considered a(n)
h h location.
h h h h h h


a. NEC® Reference: Article 100 (Location, Wet)
h h h h h


b. Answer: wet h




12. A(n) h may consist of one or more sensing elements integral with h h h h h h h h h h


hthe motor-compressor and an external control device.
h h h h h h


a. NEC® Reference: Article 100 (Thermal Protector: Informational Note)
h h h h h h h


b. Answer: thermal protector h h