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. Manufactured by a licensed supplier.

c. Verified through inspection alone.

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

Safety and protection are key purposes.

2 / 20

What is an "Enclosure"?

a. A structure enclosing utility systems.

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

c. A protective layer over conductors.

d. A covering for outdoor electrical installations.

Markings must be clear and long-lasting.

3 / 20

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

a. They must be durable and convey effective warnings.

b. They must be handwritten.

c. They are optional for small installations.

d. Only colors are required for warning labels.

Identification ensures safety in multi-phase systems.

4 / 20

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

a. They require no special marking.

b. They must be marked with an orange finish.

c. They must be grounded.

d. They must be marked with a yellow stripe.

Lockability must persist, even without the lock present.

5 / 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. Locks are required only in outdoor installations.

d. They must be used only during servicing.

Protection must match the equipment's enclosure.

6 / 20

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

a. Only metallic plugs are acceptable.

b. They must be closed to provide equivalent protection.

c. They must be permanently sealed.

d. They can remain open if indoors.

Grounding ensures electrical stability and safety

7 / 20

What does "Grounded" mean?

a. Connected to a protective device.

b. Connected to the neutral conductor.

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

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

Wiring must function as intended without faults.

8 / 20

How does Article 110.7 ensure wiring integrity?

a. Requiring short circuits for testing purposes.

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

c. Requiring all wiring to be underground.

d. Allowing minor faults in low-voltage circuits.

It pertains to dust ingress under certain conditions.

9 / 20

What does "Dusttight" mean?

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

b. Enclosures that can be cleaned without opening.

c. Enclosures for outdoor use.

d. Enclosures that prevent any dust from entering.

The NEC allows multiple conductor materials.

10 / 20

What materials are generally permitted for electrical conductors?

a. Only aluminum.

b. Only copper.

c. Silver and copper-clad alloys.

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

It compares demand to load capacity.

11 / 20

What is a "Demand Factor"?

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

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

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

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

Secure installation ensures stability and safety.

12 / 20

How does Article 110.13 address equipment mounting?

a. Equipment can be mounted on any surface.

b. Equipment must be firmly secured.

c. Temporary mounting is permissible during installation.

d. Wood plugs are allowed for anchoring in concrete.

ESS involves storing and supplying energy.

13 / 20

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

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

b. A battery backup for critical loads.

c. A capacitor bank for power stability.

d. A power generation system.

Connections depend on the lowest-rated component.

14 / 20

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

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

b. Conductors must always operate below 60°C.

c. Ratings are not relevant to terminations.

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

Environment-specific identification is essential.

15 / 20

What does Article 110.11 specify regarding deteriorating agents?

a. Equipment must be identified for the operating environment.

b. All equipment must be installed indoors.

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

d. Conductors must withstand all environmental conditions.

They are not required for temporary installations.

16 / 20

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

a. They are not required for temporary installations.

b. They must be elevated off the ground.

c. They must be waterproof.

d. They must meet specific enclosure type ratings.

Proper use depends on clear guidance.

17 / 20

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

a. Installation and usage instructions.

b. Internet resources for repairs.

c. Environmental impact information.

d. A QR code for product registration.

Focus on energized servicing requirements.

18 / 20

How does Article 110.16 address arc-flash warnings?

a. Labels are optional if maintenance is infrequent.

b. Warning labels are required for all household appliances.

c. Equipment must have generic warning signs.

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

Accurate torque ensures secure and reliable connections.

19 / 20

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

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

b. Torque values are optional for small installations.

c. Torque must only be estimated during installation.

d. Connection torque applies only to aluminum conductors.

The article sets broad standards for electrical installations.

20 / 20

What is covered under Article 110?

a. Provisions for motor control systems.

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

c. Requirements for grounding electrodes.

d. General requirements for overcurrent protection.

Your score is

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Pos.	Name	Score	Duration
1	jalva292	100 %	12 minutes 12 seconds
2	ericyd	95 %	3 minutes 3 seconds
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4	Guest	95 %	8 minutes 42 seconds
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7	Guest	80 %	5 minutes 2 seconds
8	Guest	80 %	6 minutes 3 seconds
9	Guest	75 %	3 minutes 35 seconds
10	Guest	70 %	6 minutes 8 seconds

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