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Article 200-285 Part01

This comprehensive quiz contains 50 questions carefully selected from the National Electrical Code (NEC) Articles spanning 200 through 285. These articles cover a broad spectrum of vital topics related to electrical installations within this section of the code.

The questions in this quiz are chosen randomly to provide a thorough assessment of your knowledge across these essential NEC articles. While we strive for a diverse set of questions, some fundamental principles may be revisited in different contexts due to their relevance to multiple sections within this range. This approach ensures a robust evaluation of your understanding.

We encourage you to actively participate and provide feedback. If you identify any issues or have suggestions for improving the quiz questions, please report them. Your contributions are invaluable in helping us maintain the accuracy and effectiveness of these learning resources.

Supervised installations allow specific flexibility.

1 / 50

What is the minimum ampacity requirement for branch-circuit conductors in supervised installations per 235.19(B)?

Certain transformer types are excluded from this article.

2 / 50

What is the scope of NEC Article 450 (450.1)?

Article 245 focuses on specific overcurrent protection.

3 / 50

What is the scope of Article 245?

The interrupting rating must align with the maximum fault current.

4 / 50

What is the interrupting rating requirement for circuit breakers under

Focus on equipment critical for safety.

5 / 50

What equipment is explicitly prohibited from being reconditioned per 240.2(A)?

Moisture protection is critical for enclosures in such locations.

6 / 50

What is required for circuit breaker enclosures in damp or wet locations (240.32)?

Wiring methods for industrial circuits.

7 / 50

What does Article 240 primarily address?

Branch circuits must meet specific load and outlet requirements.

8 / 50

How are branch circuits supplying multiple outlets rated per 235.23(A)

The shape aids in distinguishing fuse ratings.

9 / 50

How must plug-type fuses under 15 amps be identified (240.50(C))?

Fuses require detailed labeling for proper use.

10 / 50

What marking must all fuses carry (240.60(C))?

The marking ensures clarity for critical ratings.

11 / 50

What marking is required for fuseholders as per 245.21(B)(4)?

Safety from fire hazards is paramount.

12 / 50

What is required for overcurrent protection devices installed near ignitable material (240.24(D))?

Prevention of tampering is key.

13 / 50

What requirement applies to Type S fuseholders (240.54(C))?

Short and direct paths improve SPD performance.

14 / 50

What is required for the grounding conductor of an SPD (242.24)?

Supply-side connections are allowed for this type of SPD.

15 / 50

Where can Type 1 SPDs be installed per 242.13?

Overhead spans must ensure mechanical strength and reliability.

16 / 50

What is the minimum size for open individual conductors in overhead spans per 235.306?

Indication is not required.

17 / 50

How must SPDs indicate functionality per 242.9?

Short runs still require specific protections.

18 / 50

How must overcurrent protection be provided for transformer secondary conductors not exceeding 3 meters (10 feet) in length (240.21(C))?

Check the minimum requirements for conductors in this article.

19 / 50

What is the minimum conductor size for SPD line conductors (242.28)?

High-leg marking ensures proper identification.

20 / 50

What marking is required for the high-leg conductor in a 4-wire delta system per 230.56?

Polarity is crucial for DC systems.

21 / 50

How must branch circuits supplied from direct-current systems be identified per 235.5(C)(2)?

This applies to specific situations with conditions.

22 / 50

Under what condition can the next higher standard overcurrent device be used (240.4(B))?

Pay attention to the voltage limits mentioned.

23 / 50

What is the maximum voltage covered by Article 240 (Part I-VII)?

Selective coordination ensures faults are isolated.

24 / 50

What is required for selective coordination of overcurrent devices (240.11)?

SWD stands for switch duty.

25 / 50

What marking must be present on circuit breakers rated for fluorescent lighting circuits (240.83(D))?

Regular support prevents damage to cables.

26 / 50

What is the maximum allowable distance between supports for service entrance cables per 230.51(A)?

The NEC sets a baseline for all devices.

27 / 50

What is the minimum interrupting rating for branch-circuit overcurrent devices (240.16)?

High-voltage circuits have special requirements.

28 / 50

What is required for fuses installed in circuits over 150 volts to ground (240.40)?

Grounding is critical for autotransformer circuits.

29 / 50

What is the rule for branch circuits derived from autotransformers per 235.9?

Arc energy reduction focuses on safety during faults.

30 / 50

What is the purpose of arc energy reduction for devices rated 1200 amperes or higher (240.87)?

Clearance ensures safety from tall vehicles.

31 / 50

What clearance is required for conductors over roadways per 235.360(A)?

The rating accounts for voltage surges.

32 / 50

What rating must surge arresters meet per 242.42?

Focus on documenting protection strategies.

33 / 50

What documentation is required for arc energy reduction methods under 240.67?

Selective coordination ensures faults are isolated.

34 / 50

What is required for selective coordination of overcurrent devices (240.11)?

Only certain high-voltage equipment can be reconditioned.

35 / 50

What type of equipment is permitted to be reconditioned as per 245.2(A)?

Some systems require specific SPD listing.

36 / 50

What is prohibited for SPDs as specified in 242.12?

Long taps have specific ampacity requirements.

37 / 50

How are taps not exceeding 25 feet protected (240.21(B))?

The devices must handle all fault conditions.

38 / 50

What is the minimum requirement for protective devices in feeders and branch circuits as per 245.26(A)?

Identification methods align with general NEC rules for grounded conductors.

39 / 50

How must grounded conductors of branch circuits over 1000 volts be identified per 235.5(A)?

Focus on high-voltage installations.

40 / 50

What is the scope of Article 235?

Small conductors have specific ampacity limits.

41 / 50

What are the ampacity limits for 18 AWG copper conductors (240.4(D))?

SPDs need third-party certification for compliance.

42 / 50

What is required for SPDs under 242.6?

Type 2 SPDs protect downstream equipment.

43 / 50

What is a key installation requirement for Type 2 SPDs (242.14)?

Selective coordination ensures faults are isolated.

44 / 50

What is required for selective coordination of overcurrent devices (240.11)?

Identification is key to distinguishing between systems.

45 / 50

What is the requirement for ungrounded conductors supplied from more  than one nominal voltage system per 235.5(C)(1)?

Overcurrent devices must disconnect ungrounded conductors in fault conditions.

46 / 50

What type of overcurrent device is required for ungrounded conductors (240.15)?

Continuous loads require extra margin.

47 / 50

What is required for overcurrent protection of branch circuits per 235.20?

The position ensures clarity of operation.

48 / 50

What is required for circuit breakers operating vertically (240.81)?

Focus on devices that protect against voltage surges.

49 / 50

What does Article 242 primarily cover?

At least 6 feet above the ground.

50 / 50

Where must surge arresters be installed to ensure safety (242.46)?

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