UNEC 90 Flashcards
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Questions and Answers

What is included in the form of Informational Notes according to NEC?

Explanatory material, such as references to other standards, references to related sections of the NEC, or information related to a Code rule.

Compliance with the provisions of the NEC will result in _____

an electrical system essentially free from hazard

The NEC applies to the installation of _____

  • Electrical conductors and equipment within or on public and private buildings
  • Outside conductors and equipment on the premises
  • Optical fiber cables and raceways
  • All of the above (correct)

    • What does the NEC not apply to?

    <p>Electric utility owned wiring and equipment consisting of service drops or service laterals.</p> Signup and view all the answers

    The authority having jurisdiction shall not be allowed to enforce any requirements of Chapter 7 (Special Conditions) or Chapter 8 (Communications Systems).

    <p>False</p> Signup and view all the answers

    The NEC does not cover electrical installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles.

    <p>True</p> Signup and view all the answers

    By special permission, the authority having jurisdiction may waive specific requirements in this Code.

    <p>True</p> Signup and view all the answers

    Installations of communications equipment that are under the exclusive control of communications utilities are covered by the NEC.

    <p>False</p> Signup and view all the answers

    Who has the responsibility for deciding on the approval of equipment and materials?

    <p>Authority having jurisdiction</p> Signup and view all the answers

    Installations shall comply with the material located in the NEC Annexes because they are part of the requirements of the Code.

    <p>False</p> Signup and view all the answers

    In the NEC, the word(s) '_____' indicate a mandatory requirement.

    <p>shall (or) shall not</p> Signup and view all the answers

    The NEC is _____

    <p>for the practical safeguarding of persons and property</p> Signup and view all the answers

    The Code contains provisions considered necessary for safety, which will not necessarily result in _____

    <p>efficient use</p> Signup and view all the answers

    Nonmandatory Informative Annexes contained in the back of the Code book _____

    <p>Both A and B</p> Signup and view all the answers

    Electric utilities may include entities that install, operate, and maintain _____

    <p>communications systems or electric supply systems</p> Signup and view all the answers

    Compliance with either the SI or the inch pound unit of measurement system shall be permitted.

    <p>True</p> Signup and view all the answers

    Utilities may include entities that are designated or recognized by governmental law or regulation by public service/utility commissions.

    <p>True</p> Signup and view all the answers

    Factory installed _____ wiring of listed equipment need not be inspected at the time of installation of the equipment.

    <p>Internal</p> Signup and view all the answers

    This Code covers the installation of _____ for public and private premises, including buildings, structures, mobile homes, recreational vehicles, and floating buildings.

    <p>All of the above</p> Signup and view all the answers

    Utilities may be subject to compliance with codes and standards covering their regulated activities.

    <p>True</p> Signup and view all the answers

    The Code covers underground mine installations and self propelled mobile surface mining machinery and its attendant electrical trailing cable.

    <p>False</p> Signup and view all the answers

    Chapters 5, 6, and 7 apply to special occupancies, special equipment, or other special conditions.

    <p>True</p> Signup and view all the answers

    Which systems shall be installed and removed in accordance with the NEC requirements?

    <p>Signaling conductors, equipment, and raceways; communications conductors, equipment, and raceways; electrical conductors, equipment, and raceways.</p> Signup and view all the answers

    The authority having jurisdiction has the responsibility for _____

    <p>Making interpretations of rules, deciding upon the approval of equipment and materials, waiving specific requirements in the code.</p> Signup and view all the answers

    The Code isn't intended as a design specification standard or instruction manual for untrained persons.

    <p>True</p> Signup and view all the answers

    If the NEC requires new products that are not yet available, who may permit the use of the products that comply with the most recent previous edition of the Code?

    <p>Authority having jurisdiction</p> Signup and view all the answers

    Communications wiring within a building shall not be required to comply with the installation requirements of Chapters 1 through 7.

    <p>True</p> Signup and view all the answers

    Chapters 1 through 4 of the NEC apply generally to all electrical installations.

    <p>True</p> Signup and view all the answers

    Hazards often occur because of _____

    <p>overloading of wiring systems by methods or usage not in conformity with the NEC</p> Signup and view all the answers

    When the Code uses '_____,' it means the identified actions are allowed but not required.

    <p>Shall be permitted</p> Signup and view all the answers

    Study Notes

    Explanatory Notes and Compliance

    • Informational Notes provide explanatory material, references to other standards, and information related to Code rules in NEC.
    • Compliance with NEC provisions leads to an electrical system that is essentially hazard-free.

    Scope of the NEC

    • NEC applies to the installation of electrical conductors and equipment, including outside conductors and optical fiber cables within or on public and private buildings.
    • Electric utility-owned wiring and equipment such as service drops or service laterals are excluded from NEC coverage.
    • NEC does not cover installations in ships, aircraft, railway rolling stock, or automotive vehicles.

    Authority and Regulations

    • The authority having jurisdiction (AHJ) decides on the approval of equipment and materials and may waive specific Code requirements for safety assurance.
    • Installations under exclusive control of communications utilities located outdoors are not covered by the NEC.
    • Utilities may include entities recognized by law or regulation, encompassing communication and electric supply systems.

    Code Application and Interpretations

    • The NEC is formulated for the practical safeguarding of persons and property and does not necessarily ensure efficient use or convenience.
    • Nonmandatory Informative Annexes in the NEC are for information only and are not enforceable requirements.
    • Chapters 5, 6, and 7 of the NEC apply to special conditions and can modify requirements in earlier chapters.

    Specific Installations and Measurements

    • Compliance with either SI or inch-pound measurement systems is permissible.
    • Factory-installed internal wiring of listed equipment does not require inspection unless alterations or damage are detected.
    • The Code does not cover underground mine installations and subterranean machinery electrical cables.

    Interpretations and Responsibilities

    • AHJ is responsible for interpreting rules, approving equipment, and permitting alternate methods while ensuring safety.
    • The Code aims not to serve as a design manual for untrained individuals, emphasizing safety standards in electrical installations.

    Hazards and Risks

    • Hazards may arise from overloading wiring systems or initial installations failing to account for future electricity usage increases.
    • The term "shall be permitted" indicates actions that are allowed but not mandatory under the Code.

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    Test your knowledge of the National Electrical Code (NEC) with these flashcards covering key definitions and concepts. Each card focuses on important regulations and compliance standards that ensure electrical safety. Perfect for students and professionals in electrical engineering.

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