Questions and Answers
An electrical cabinet is installed so the door can be opened to 75° before being stopped by another piece of installed equipment. Is this acceptable, or is it a violation?
False
Informative Annexes are part of the enforceable requirements of the NEC.
False
Chapters 5, 6, and 7 are special and will supplement or modify what?
Chapters 1 through 7
Chapter 8 is not subject to the requirements of Chapters 1 through 7, unless a specific reference is made in what?
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Chapters 1 through 4 apply generally to what?
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Tables located in Chapter 9 apply only where?
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Where a Chapter 5 article applies in a special occupancy, Chapters 1 through 4 will not apply to the special occupancy.
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Do the provisions of 300.21, which are designed to prevent the spread of fire and products of combustion, apply to Chapter 8 articles?
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A fire alarm system is considered a 'Special Condition.' Which Chapter 7 article would apply to the installation of a fire alarm system?
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Where a Chapter 7 article applies for a special condition, Chapters 1 through 4 still apply to the special condition.
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Match the scope to the appropriate fundamental chapter:
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Match the scope to the appropriate special chapter:
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The nine chapters of the NEC are broad in scope and are subdivided into different what to address the chapter scope?
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The NEC contains Informational Notes, which provide what type of information to aid in the application of the NEC?
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Mandatory language in the NEC is represented by the use of what?
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Electrical conductors installed in rigid metal conduit encased in concrete are considered what?
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What is defined as being constructed or protected so that exposure to beating rain will not result in the entrance of water under specified test conditions?
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The voltage to ground in an ungrounded delta, 3-phase, 3-wire system rated at 480 volts is considered what?
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The structure of the NEC is governed by what?
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The use of permissive language in the NEC is signified by what terms?
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The NEC contains exceptions where the requirement is truly an exception. Where more than one exception exists, they are always numbered and written in what?
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How many second-level subdivisions exist in the first-level subdivision NEC 240.21(B)?
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How many sections exist in Part III of Article 250?
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Terms that are used in two or more articles in the NEC, and therefore must be defined, are located in what?
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Match the name of the chapter in the NEC with the number of the chapter.
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Who has the authority to grant exceptions to Code provisions?
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Which installation is not covered by the Code?
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Informational Notes are used for explanatory materials and are not an enforceable part of the Code.
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The minimum height of the working space in a commercial installation is what?
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When the word conductor is used in the NEC and the type of conductor material is not specified, the NEC requirement is for what?
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All listed or labeled equipment shall be installed and used in accordance with any what included in the listing or labeling?
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Study Notes
Overview of National Electrical Code (NEC)
- Electrical cabinets must allow doors to open to 75° before contacting other equipment; this is a violation (110.26(A)(2)).
- Informative Annexes are not enforceable requirements under the NEC (90.5(D)).
- Chapters 5, 6, and 7 modify or supplement Chapters 1 through 7 (90.3).
- Chapter 8 operates independently unless specifically referenced in Chapter 8.
- Chapters 1 through 4 apply generally to all electrical installations (90.3).
- Chapter 9 tables are applicable only when referenced in the NEC.
Special Occupancies and Conditions
- If a Chapter 5 article applies to a special occupancy, Chapters 1 through 4 do not apply (90.3).
- Provisions in 300.21 preventing fire spread apply to Chapter 8 only when specifically referenced (90.3).
- A fire alarm system falls under "Special Condition," subject to Article 760.
- When a Chapter 7 article applies to a special condition, Chapters 1 through 4 are still applicable (T, 90.3).
Structure and Language of NEC
- Chapters 1 through 4 provide the foundational requirements for electrical installations; their scopes include:
- Equipment for General Use → Chapter 4
- General Applications → Chapter 1
- Wiring and Protection → Chapter 2
- Wiring Methods and Materials → Chapter 3
- Chapters 5, 6, and 7 offer additional requirements by modifying general rules (Special Conditions → Chapter 7, Special Equipment → Chapter 6, Special Occupancies → Chapter 5).
NEC Articles and Notes
- NEC is organized into nine chapters, further divided into articles addressing specific scopes.
- Informational Notes provide non-enforceable guidance on Code application (design, reference, suggestion, example).
- Mandatory language in the NEC is identified through the terms "shall" and "shall not."
- Exceptions in the Code are italicized and numbered when multiple exist.
Conductor and Installation Standards
- Electrical conductors in rigid metal conduit encased in concrete are deemed accessible (100).
- Raintight construction prevents water entrance under designated test conditions (100).
- Voltage referenced for an ungrounded delta, 3-phase system at 480 volts is 480 V (100).
- The NEC Style Manual governs the structural composition of the NEC.
Authority and Exceptions
- The authority having jurisdiction can grant exceptions to Code provisions (90.2(C)).
- Installations not covered by the NEC include underground mines and utility distribution stations (90.2(B)(2)).
- Informational Notes serve as guidance rather than enforceable provisions (T).
Working Space and Conductor Requirements
- Minimum height for working space in a commercial installation is 6.5 feet (110.26(A)(3)).
- When "conductor" is mentioned without material specification, copper is the default requirement (110.5).
- Listed or labeled equipment must be used according to the manufacturer's instructions (110.3(B)).
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on the National Electrical Code (NEC) with this quiz focused on Lesson 1. Each flashcard covers key points and interpretations from Chapter 1, ensuring you understand both the rules and exceptions within the NEC framework.
