90.5(B) Permissive Rules allow:

Certain actions that are allowed but not required

90.4(D) New Products, Constructions, or Materials allows the AHJ to:

Approve materials complying with the most recent NEC edition

What is the purpose of 90.9(B) Dual System of Units?

To use metric and inch-pound units together

90.6 Formal Interpretations are developed to:

Promote uniform application of the NEC

What does 90.2(F) Special Permission allow the authority having jurisdiction (AHJ) to do?

Grant exceptions for electrical conductors outside a building

What is the primary purpose of Article 90 in the NEC?

To establish safety guidelines for the use of electricity

90.3 Code Arrangement explains that Chapters 1 through 4 apply:

To all electrical installations generally

What does 90.7 Examination of Equipment for Safety aim to prevent?

Multiple inspections of factory-tested equipment

90.2(A) Practical Safeguarding states that the NEC is not intended to be:

A design specification or instruction manual

90.5(A) Mandatory Rules are characterized by:

The terms "shall" or "shall not"

What does 90.2(B) Adequacy emphasize about compliance with the NEC?

It results in an installation that is essentially free from hazard

90.8(A) Future Expansion and Convenience recommends:

Planning for future increases in electrical use

Which of the following is covered under 90.2(C) Installations Covered?

Electrical conductors in mobile homes

According to 90.4(B) Interpretations, who is responsible for making interpretations of the NEC rules?

The authority having jurisdiction (AHJ)

90.9(C) Soft Conversion refers to:

Direct mathematical conversions without changing dimensions

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NEC Article 90

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Questions 21

Answers

1
90.5(B) Permissive Rules allow:
No flexibility in NEC compliance
Certain actions that are allowed but not required
Variations only for utility companies
The AHJ to ignore certain NEC rules
2
90.4(D) New Products, Constructions, or Materials allows the AHJ to:
Ban the use of new materials until tested extensively
Permit older NEC editions to be used
Approve materials complying with the most recent NEC edition
Require all new technology be used immediately
3
What is the purpose of 90.9(B) Dual System of Units?
To phase out inch-pound measurements
To use metric and inch-pound units together
To make metric measurements mandatory
To eliminate conversion errors
4
How was Article 90 restructured in the 2023 NEC update?
To make the code stricter for residential installations
To provide more clarity
To include additional technical requirements
To introduce new mandatory provisions
5
According to 90.9(A) Measurement System of Preference, NEC prefers:
A mix of imperial and metric based on manufacturer preference
Metric (SI) units
Using only approximate measurements
Inch-pound units only
6
90.6 Formal Interpretations are developed to:
Allow informal guidance to override code requirements
Promote uniform application of the NEC
Replace decisions by the AHJ
Provide flexibility in interpretations
7
What does 90.2(F) Special Permission allow the authority having jurisdiction (AHJ) to do?
Grant exceptions for electrical conductors outside a building
Allow unlicensed individuals to install electrical systems
Modify code requirements for cost-saving reasons
Waive safety requirements for experienced electricians
8
Click on any day of the week
Noday
Monday
Friday
Tuesday
9
What is the primary purpose of Article 90 in the NEC?
To establish safety guidelines for the use of electricity
To regulate electrical utility pricing
To outline construction guidelines for electrical contractors
To provide design specifications for electrical installations
10
90.3 Code Arrangement explains that Chapters 1 through 4 apply:
Only to residential electrical installations
To all electrical installations generally
To electrical utility operations only
Exclusively to industrial applications
11
Which of the following chapters is not subject to Chapters 1-7, except when specifically referenced?
Chapter 6
Chapter 2
Chapter 4
Chapter 8
12
Informational notes in the NEC:
Are for guidance only
Are enforceable
Define penalties for noncompliance
Must be followed at all times
13
What does 90.7 Examination of Equipment for Safety aim to prevent?
Multiple inspections of factory-tested equipment
Independent testing of every electrical component
The use of nonstandard materials in residential settings
Mandatory post-installation inspections
14
90.2(A) Practical Safeguarding states that the NEC is not intended to be:
A design specification or instruction manual
A legal requirement
Applicable to industrial settings
Used by electricians
15
90.5(A) Mandatory Rules are characterized by:
The terms "shall" or "shall not"
Permissive language
Recommendations rather than requirements
The terms "should" or "could"
16
What does 90.2(B) Adequacy emphasize about compliance with the NEC?
It mandates the most cost-effective wiring practices
It guarantees efficiency and convenience
It ensures the installation will be free from all hazards
It results in an installation that is essentially free from hazard
17
90.8(A) Future Expansion and Convenience recommends:
Using the smallest raceways possible
Avoiding spare raceways to reduce costs
Installing only the minimum required circuits
Planning for future increases in electrical use
18
Which of the following is covered under 90.2(C) Installations Covered?
Electrical conductors in mobile homes
Underground mining equipment wiring
Communications utility installations in exclusive spaces
Electrical installations in aircraft
19
According to 90.4(B) Interpretations, who is responsible for making interpretations of the NEC rules?
The authority having jurisdiction (AHJ)
The NFPA enforcement committee
Local electricians
Electrical manufacturers
20
90.9(C) Soft Conversion refers to:
Direct mathematical conversions without changing dimensions
Eliminating the use of traditional trade sizes
Adjusting NEC rules to international standards
Physically altering product sizes to match metric units
21
Under 90.2(D) Installations Not Covered, which of the following is NOT excluded from NEC requirements?
Electrical systems in ships
Railway power systems
Service drops and laterals under utility control
Floating buildings

NEC Article 90 Flashcards | StudBud