NEC Special Occupancies & Hazardous Locations

Question 1

Which NEC article specifically governs electrical installations in Class I hazardous locations where flammable gases or vapors may be present?

Accepted Answer

Article 501

Answer

Article 500

Answer

Article 502

Answer

Article 503

Question 2

According to the NEC, Class II hazardous locations are characterized by the presence of which hazardous substance?

Accepted Answer

Combustible dust

Answer

Flammable gases

Answer

Flammable liquids

Answer

Ignitable fibers

Question 3

In the NEC Division classification system, what does 'Division 1' indicate about a hazardous location?

Accepted Answer

The hazardous atmosphere can exist under normal operating conditions

Answer

The hazardous atmosphere exists only during abnormal conditions

Answer

The area is classified as non-hazardous above 18 inches

Answer

The area requires only weatherproof-rated equipment

Question 4

NEC Article 517 provides electrical requirements for which type of special occupancy?

Accepted Answer

Health care facilities

Answer

Commercial garages

Answer

Motor fuel dispensing facilities

Answer

Agricultural buildings

Question 5

Per NEC Section 680.22(A)(1), what is the minimum distance a 125-volt receptacle must be located from the inside wall of a permanently installed swimming pool?

Accepted Answer

6 feet

Answer

3 feet

Answer

10 feet

Answer

20 feet

Question 6

Under NEC Article 511, the area up to 18 inches above the floor in a commercial garage is classified as which hazardous location?

Accepted Answer

Class I, Division 2

Answer

Class I, Division 1

Answer

Class II, Division 1

Answer

Unclassified

Question 7

Which NEC article covers electrical requirements for places of assembly where 100 or more persons may gather?

Accepted Answer

Article 518

Answer

Article 511

Answer

Article 514

Answer

Article 547