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Questions and Answers
The First _____ chapters of the NEC apply generally unless they are modified by the latter chapters.
The First _____ chapters of the NEC apply generally unless they are modified by the latter chapters.
Four
Chapter ___ of the NEC is independent of the other chapters, and none of the provisions apply unless they are directly referenced.
Chapter ___ of the NEC is independent of the other chapters, and none of the provisions apply unless they are directly referenced.
Eight
Equipment designed to open circuits under fault conditions shall have an interrupting rating not less than the available voltage and circuit current at the line side of the equipment.
Equipment designed to open circuits under fault conditions shall have an interrupting rating not less than the available voltage and circuit current at the line side of the equipment.
True (A)
Wet locations are subject to moderate degrees of moisture, but are generally out of the weather.
Wet locations are subject to moderate degrees of moisture, but are generally out of the weather.
A short circuit is the unintentional connection of two underground conductors that have a potential difference between them.
A short circuit is the unintentional connection of two underground conductors that have a potential difference between them.
Equipment that is required to be readily accessible shall be capable of being reached quickly without the use of tools, with an exception for ___.
Equipment that is required to be readily accessible shall be capable of being reached quickly without the use of tools, with an exception for ___.
A conductor's ___ is the amount of amperes it can carry continuously without exceeding its temperature rating.
A conductor's ___ is the amount of amperes it can carry continuously without exceeding its temperature rating.
Boxes installed within walls that are required to be taken down to gain access are not considered ____.
Boxes installed within walls that are required to be taken down to gain access are not considered ____.
The word ___ indicates that an NEC rule is mandatory.
The word ___ indicates that an NEC rule is mandatory.
The NEC is revised and updated every six years.
The NEC is revised and updated every six years.
At least two entrances to electrical rooms shall be provided to give access to the working space about all electrical equipment rated less than 1200 A.
At least two entrances to electrical rooms shall be provided to give access to the working space about all electrical equipment rated less than 1200 A.
The basic rule when selecting termination devices is to always use a termination device identified for the type of conductor material.
The basic rule when selecting termination devices is to always use a termination device identified for the type of conductor material.
The twofold purpose of the NEC is to protect ____ from the hazards associated with the use of electricity.
The twofold purpose of the NEC is to protect ____ from the hazards associated with the use of electricity.
Most voltage referenced in the NEC are ____ voltages.
Most voltage referenced in the NEC are ____ voltages.
Interpretations and approval of equipment are granted by the _____.
Interpretations and approval of equipment are granted by the _____.
The AHJ can permit alternate ____ for installation, if they believe the installation is equally effective at meeting the intended objective.
The AHJ can permit alternate ____ for installation, if they believe the installation is equally effective at meeting the intended objective.
Although installed in conformance with the NEC, all electrical installations may not be adequate for ____ expansion of electrical use.
Although installed in conformance with the NEC, all electrical installations may not be adequate for ____ expansion of electrical use.
The NEC is not intended to be used as a(n) ____ specification.
The NEC is not intended to be used as a(n) ____ specification.
Explanatory material appears in the NEC in Informational Notes.
Explanatory material appears in the NEC in Informational Notes.
The minimum headroom of working spaces about electrical equipment in commercial buildings is 6.5 feet.
The minimum headroom of working spaces about electrical equipment in commercial buildings is 6.5 feet.
Electric equipment with ventilating openings shall be installed so that openings are not obstructed to prevent the free circulation of air.
Electric equipment with ventilating openings shall be installed so that openings are not obstructed to prevent the free circulation of air.
The NEC may be used as a design specification by qualified persons.
The NEC may be used as a design specification by qualified persons.
If the AHJ finds the equipment or installation to be acceptable, it is ____.
If the AHJ finds the equipment or installation to be acceptable, it is ____.
_____ conductors are conductors not encased in a material recognized by the NEC as electrical insulation.
_____ conductors are conductors not encased in a material recognized by the NEC as electrical insulation.
Connectors, couplings, locknuts, and bushings are examples of electrical _____.
Connectors, couplings, locknuts, and bushings are examples of electrical _____.
_____ means recognized as suitable for the use, purpose, etc.
_____ means recognized as suitable for the use, purpose, etc.
Equipment that is required to be located in sight from other equipment shall be visible and not more than ____ ' from the other equipment.
Equipment that is required to be located in sight from other equipment shall be visible and not more than ____ ' from the other equipment.
Equipment that has been _____ is published in a directory by the testing lab certifying that it has met established standards and is acceptable to the AHJ.
Equipment that has been _____ is published in a directory by the testing lab certifying that it has met established standards and is acceptable to the AHJ.
One of the primary purposes of raceways is to support conductors and protect them from physical _____.
One of the primary purposes of raceways is to support conductors and protect them from physical _____.
The NEC requires that all electric equipment and conductors be ____ to be deemed acceptable to the AHJ.
The NEC requires that all electric equipment and conductors be ____ to be deemed acceptable to the AHJ.
When not specified, all conductors in the NEC are considered to be ____.
When not specified, all conductors in the NEC are considered to be ____.
All unused openings other than those intended for the operation of equipment are required to be effectively ____ to afford equivalent protection.
All unused openings other than those intended for the operation of equipment are required to be effectively ____ to afford equivalent protection.
Terminals for more than one conductor shall be ____.
Terminals for more than one conductor shall be ____.
If a splice is underground, the device shall be listed for ____ use.
If a splice is underground, the device shall be listed for ____ use.
One of the ____ shall be readily accessible as required by the NEC.
One of the ____ shall be readily accessible as required by the NEC.
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Study Notes
NEC Chapter Overview
- The first four chapters of the NEC are applicable unless modified by subsequent chapters.
- Chapter eight operates independently, with its provisions applying only when referenced.
Key Equipment Specifications
- Equipment designed to disconnect under fault conditions requires an interrupting rating to match or exceed the voltage and current at its line-side.
- Equipment must be readily accessible without tools, except where keys are involved.
- Conductors' ampacity defines the maximum amperes they can handle continuously without exceeding temperature ratings.
Accessibility and Definitions
- Installed boxes within walls that require removal for access are not classified as accessible.
- "Shall be" is the terminology indicating mandatory NEC rules.
- Various types of equipment require specific termination devices suitable for the conductor material used.
Electrical Safety and Regulations
- The NEC's primary goals are to protect persons and property from electrical hazards.
- Most voltages referenced in the NEC are nominal, affecting safety and compliance standards.
- The Authority Having Jurisdiction (AHJ) grants interpretations and approvals for electrical equipment and installations.
Installation Practices and Compliance
- The AHJ can allow alternative methods for installation deemed equally effective.
- Compliance with the NEC does not automatically guarantee preparedness for future electrical demands.
- The NEC is not intended to serve as a design specification.
Informational Materials and Working Spaces
- Informational Notes in the NEC provide explanatory materials.
- A minimum headroom of 6.5 feet is required in working spaces near electrical equipment in commercial buildings.
Equipment Installation Guidelines
- Equipment with ventilating openings must allow for unobstructed air circulation.
- If the AHJ approves an installation, it is considered acceptable.
- Conductors not encased in NEC-recognized electrical insulation are termed covered conductors.
Components and Standards
- Electrical fittings include connectors, couplings, locknuts, and bushings.
- Equipment visible from other equipment must be no more than 50 feet apart for visibility.
- Equipment meeting established standards is listed in directories by testing labs.
Protection and Acceptability
- Raceways serve to support conductors while protecting them from physical damage.
- All electrical equipment and conductors must be approved to be deemed acceptable to the AHJ.
- Copper is the presumed material for conductors unless specified otherwise.
Maintenance and Closing Openings
- All unused openings not meant for operation must be effectively closed for protection.
- Terminals designed for multiple conductors must be clearly identified.
- Splices installed in underground settings require devices specifically listed for burial use.
Disconnect Means
- One disconnect means must always be readily accessible, per NEC requirements.
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