Article 100-110 Quiz01

This quiz includes 20 questions selected from NEC Articles 100 to 110. The questions are chosen randomly, with no repeats from other quizzes—unless a particular question is used again on purpose because it relates to more than one topic, such as both cable ampacity and cable application.

If you spot any issues or have suggestions, you’re welcome to report questions or review the quiz. Your feedback matters, and contributions to help improve and refine the questions and quizzes are always appreciated.

Approval is determined by an overseeing authority

1 / 20

What does "Approved" equipment mean in the context of NEC Article
110?

a. Certified by any testing laboratory.

b. Acceptable to the authority having jurisdiction (AHJ).

c. Verified through inspection alone.

d. Manufactured by a licensed supplier.

The article sets broad standards for electrical installations.

2 / 20

What is covered under Article 110?

a. Provisions for motor control systems.

b. General requirements for overcurrent protection.

c. Requirements for grounding electrodes.

d. General requirements for installation, use, and access to electrical conductors and equipment.

Identification helps avoid confusion during operation.

3 / 20

What does Article 110.22 require for disconnecting means
identification?

a. It must legibly indicate its purpose.

b. Identification is only required for industrial settings.

c. Identification should be visible only during servicing.

d. It must use engraved plaques.

It compares demand to load capacity.

4 / 20

What is a "Demand Factor"?

a. The ratio of current to voltage in a circuit.

b. The ratio of total connected load to maximum demand.

c. The percentage of time a load is in operation.

d. The ratio of maximum demand to total connected load.

Environment-specific identification is essential.

5 / 20

What does Article 110.11 specify regarding deteriorating agents?

a. Deteriorating effects are not a concern for electrical equipment.

b. Equipment must be identified for the operating environment.

c. Conductors must withstand all environmental conditions.

d. All equipment must be installed indoors.

Accurate torque ensures secure and reliable connections.

6 / 20

What does Article 110.14(D) specify about terminal connection torque?

a. Connection torque applies only to aluminum conductors.

b. Proper tools or devices must be used to achieve indicated torque values.

c. Torque must only be estimated during installation.

d. Torque values are optional for small installations.

Focus on energized servicing requirements.

7 / 20

How does Article 110.16 address arc-flash warnings?

a. Labels are optional if maintenance is infrequent.

b. Equipment likely to require energized maintenance must have arc-flash warnings.

c. Equipment must have generic warning signs.

d. Warning labels are required for all household appliances.

Safety and protection are key purposes.

8 / 20

What is an "Enclosure"?

a. A structure enclosing utility systems.

b. A covering for outdoor electrical installations.

c. The case or housing surrounding equipment to prevent accidental contact with energized parts.

d. A protective layer over conductors.

They are not required for temporary installations.

9 / 20

What is required for enclosures in damp or wet locations under Article
110.28?

a. They must be elevated off the ground.

b. They are not required for temporary installations.

c. They must meet specific enclosure type ratings.

d. They must be waterproof.

Connections depend on the lowest-rated component.

10 / 20

What are the temperature limitations for conductor connections in
Article 110.14?

a. Conductors must always operate below 60°C.

b. Conductor temperatures must not exceed the lowest-rated component.

c. Conductors are rated only for high-temperature environments.

d. Ratings are not relevant to terminations.

The fault current is a critical factor.

11 / 20

How does Article 110.9 address interrupting ratings?

a. Ratings apply only to low-voltage circuits.

b. Equipment must withstand all electrical faults.

c. Ratings are determined after installation.

d. Interrupting ratings must equal or exceed available fault current.

Proper use depends on clear guidance.

12 / 20

What must equipment listings include according to Article 110.3(B)?

a. A QR code for product registration.

b. Installation and usage instructions.

c. Internet resources for repairs.

d. Environmental impact information.

Wiring must function as intended without faults.

13 / 20

How does Article 110.7 ensure wiring integrity?

a. Allowing minor faults in low-voltage circuits.

b. Requiring short circuits for testing purposes.

c. Mandating that wiring be free of short circuits and ground faults.

d. Requiring all wiring to be underground.

ESS involves storing and supplying energy.

14 / 20

How is "Energy Storage System (ESS)" defined?

a. A power generation system.

b. A capacitor bank for power stability.

c. One or more devices capable of storing energy and providing electrical energy into the premises wiring system or a power network.

d. A battery backup for critical loads.

It pertains to dust ingress under certain conditions.

15 / 20

What does "Dusttight" mean?

a. Enclosures that prevent any dust from entering.

b. Enclosures for outdoor use.

c. Enclosures that can be cleaned without opening.

d. Enclosures constructed to prevent dust entry under specific test conditions.

Secure installation ensures stability and safety.

16 / 20

How does Article 110.13 address equipment mounting?

a. Temporary mounting is permissible during installation.

b. Equipment must be firmly secured.

c. Equipment can be mounted on any surface.

d. Wood plugs are allowed for anchoring in concrete.

Markings must be clear and long-lasting.

17 / 20

What does Article 110.21(B) specify about field-applied hazard
markings?

a. They are optional for small installations.

b. They must be durable and convey effective warnings.

c. Only colors are required for warning labels.

d. They must be handwritten.

Safety depends on preventing accidental contact with live parts.

18 / 20

What does Article 110.27 mandate about guarding live parts?

a. Live parts must be guarded against accidental contact.

b. Guarding is optional for low-voltage systems.

c. Live parts must always be enclosed.

d. Live parts must be elevated above 10 feet.

Lockability must persist, even without the lock present.

19 / 20

What does Article 110.25 require for lockable disconnecting means?

a. They must remain lockable with or without the lock installed.

b. They must have integrated padlocks.

c. They must be used only during servicing.

d. Locks are required only in outdoor installations.

The NEC allows multiple conductor materials.

20 / 20

What materials are generally permitted for electrical conductors?

a. Copper, aluminum, or copper-clad aluminum.

b. Only aluminum.

c. Silver and copper-clad alloys.

d. Only copper.

Your score is

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