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.

Connections depend on the lowest-rated component.

1 / 20

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

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

b. Ratings are not relevant to terminations.

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

d. Conductors must always operate below 60°C.

The fault current is a critical factor.

2 / 20

How does Article 110.9 address interrupting ratings?

a. Equipment must withstand all electrical faults.

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

c. Ratings are determined after installation.

d. Ratings apply only to low-voltage circuits.

Wiring must function as intended without faults.

3 / 20

How does Article 110.7 ensure wiring integrity?

a. Requiring short circuits for testing purposes.

b. Allowing minor faults in low-voltage circuits.

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

d. Requiring all wiring to be underground.

The article sets broad standards for electrical installations.

4 / 20

What is covered under Article 110?

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

b. Provisions for motor control systems.

c. General requirements for overcurrent protection.

d. Requirements for grounding electrodes.

Lockability must persist, even without the lock present.

5 / 20

What does Article 110.25 require for lockable disconnecting means?

a. They must be used only during servicing.

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

c. Locks are required only in outdoor installations.

d. They must have integrated padlocks.

Accessibility for maintenance is critical.

6 / 20

How does Article 110.26 define the required working space around
electrical equipment?

a. Only the width of the equipment.

b. Enough space to safely operate and maintain the equipment.

c. Space requirements depend solely on the equipment voltage.

d. At least 1 foot on all sides of the equipment.

Approval is determined by an overseeing authority

7 / 20

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

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

b. Verified through inspection alone.

c. Certified by any testing laboratory.

d. Manufactured by a licensed supplier.

Proper use depends on clear guidance.

8 / 20

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

a. A QR code for product registration.

b. Internet resources for repairs.

c. Environmental impact information.

d. Installation and usage instructions.

The NEC allows multiple conductor materials.

9 / 20

What materials are generally permitted for electrical conductors?

a. Silver and copper-clad alloys.

b. Only aluminum.

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

d. Only copper.

Safety and protection are key purposes.

10 / 20

What is an "Enclosure"?

a. A structure enclosing utility systems.

b. A protective layer over conductors.

c. A covering for outdoor electrical installations.

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

Identification ensures safety in multi-phase systems.

11 / 20

What does Article 110.15 require for high-leg conductors in a 4-wire
delta system?

a. They must be grounded.

b. They must be marked with an orange finish.

c. They must be marked with a yellow stripe.

d. They require no special marking.

Identification helps avoid confusion during operation.

12 / 20

What does Article 110.22 require for disconnecting means
identification?

a. It must legibly indicate its purpose.

b. Identification should be visible only during servicing.

c. It must use engraved plaques.

d. Identification is only required for industrial settings.

Environment-specific identification is essential.

13 / 20

What does Article 110.11 specify regarding deteriorating agents?

a. Conductors must withstand all environmental conditions.

b. All equipment must be installed indoors.

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

d. Equipment must be identified for the operating environment.

Grounding ensures electrical stability and safety

14 / 20

What does "Grounded" mean?

a. Connected to a protective device.

b. Connected to the neutral conductor.

c. Connected to earth or a conductive body serving as earth.

d. Electrically connected to earth or some conductive body serving as earth.

It pertains to dust ingress under certain conditions.

15 / 20

What does "Dusttight" mean?

a. Enclosures for outdoor use.

b. Enclosures that prevent any dust from entering.

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

d. Enclosures that can be cleaned without opening.

It compares demand to load capacity.

16 / 20

What is a "Demand Factor"?

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

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

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

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

Markings must be clear and long-lasting.

17 / 20

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

a. Only colors are required for warning labels.

b. They are optional for small installations.

c. They must be handwritten.

d. They must be durable and convey effective warnings.

They are not required for temporary installations.

18 / 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.

Fault current impacts interrupting capability.

19 / 20

What is the purpose of field marking available fault current under
Article 110.24?

a. To ensure equipment ratings are sufficient for fault conditions.

b. To document overcurrent device settings.

c. To estimate circuit impedance.

d. To warn of high voltage levels.

ESS involves storing and supplying energy.

20 / 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.

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