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 must always operate below 60°C.

b. Ratings are not relevant to terminations.

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

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

Fault current impacts interrupting capability.

2 / 20

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

a. To document overcurrent device settings.

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

c. To estimate circuit impedance.

d. To warn of high voltage levels.

Identification ensures safety in multi-phase systems.

3 / 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 a yellow stripe.

c. They must be marked with an orange finish.

d. They require no special marking.

Protection must match the equipment's enclosure.

4 / 20

What is required for unused openings in equipment per Article
110.12(A)?

a. They must be closed to provide equivalent protection.

b. Only metallic plugs are acceptable.

c. They must be permanently sealed.

d. They can remain open if indoors.

Proper use depends on clear guidance.

5 / 20

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

a. A QR code for product registration.

b. Environmental impact information.

c. Installation and usage instructions.

d. Internet resources for repairs.

Approval is determined by an overseeing authority

6 / 20

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

a. Manufactured by a licensed supplier.

b. Verified through inspection alone.

c. Certified by any testing laboratory.

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

Focus on energized servicing requirements.

7 / 20

How does Article 110.16 address arc-flash warnings?

a. Equipment must have generic warning signs.

b. Labels are optional if maintenance is infrequent.

c. Warning labels are required for all household appliances.

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

Environment-specific identification is essential.

8 / 20

What does Article 110.11 specify regarding deteriorating agents?

a. All equipment must be installed indoors.

b. Conductors must withstand all environmental conditions.

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

d. Equipment must be identified for the operating environment.

Safety depends on preventing accidental contact with live parts.

9 / 20

What does Article 110.27 mandate about guarding live parts?

a. Guarding is optional for low-voltage systems.

b. Live parts must be guarded against accidental contact.

c. Live parts must always be enclosed.

d. Live parts must be elevated above 10 feet.

It pertains to dust ingress under certain conditions.

10 / 20

What does "Dusttight" mean?

a. Enclosures that can be cleaned without opening.

b. Enclosures for outdoor use.

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

d. Enclosures that prevent any dust from entering.

Markings must be clear and long-lasting.

11 / 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.

Secure installation ensures stability and safety.

12 / 20

How does Article 110.13 address equipment mounting?

a. Wood plugs are allowed for anchoring in concrete.

b. Equipment must be firmly secured.

c. Equipment can be mounted on any surface.

d. Temporary mounting is permissible during installation.

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

c. Requiring all wiring to be underground.

d. Requiring short circuits for testing purposes.

Lockability must persist, even without the lock present.

14 / 20

What does Article 110.25 require for lockable disconnecting means?

a. They must have integrated padlocks.

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

c. They must be used only during servicing.

d. Locks are required only in outdoor installations.

The fault current is a critical factor.

15 / 20

How does Article 110.9 address interrupting ratings?

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

b. Ratings are determined after installation.

c. Ratings apply only to low-voltage circuits.

d. Equipment must withstand all electrical faults.

It compares demand to load capacity.

16 / 20

What is a "Demand Factor"?

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

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

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

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

Safety and protection are key purposes.

17 / 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.

The NEC allows multiple conductor materials.

18 / 20

What materials are generally permitted for electrical conductors?

a. Only aluminum.

b. Only copper.

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

d. Silver and copper-clad alloys.

Accurate torque ensures secure and reliable connections.

19 / 20

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

a. Connection torque applies only to aluminum conductors.

b. Torque values are optional for small installations.

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

d. Torque must only be estimated during installation.

Grounding ensures electrical stability and safety

20 / 20

What does "Grounded" mean?

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

b. Connected to a protective device.

c. Connected to the neutral conductor.

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

Your score is

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