Journeyman Electrician’s Exam Journeyman Electrician's Hazardous Locations

Question 1

What type of hazardous material defines a Class I hazardous location?

Accepted Answer

Flammable gases or vapors

Answer

Class I locations are those where flammable gases or vapors may be present in quantities sufficient to produce explosive or ignitable mixtures.

Question 2

In a Class I, Division 1 location, ignitable concentrations of flammable gas exist:

Accepted Answer

Under normal operating conditions

Answer

Division 1 means ignitable concentrations exist under normal operating conditions, during repair or maintenance, or due to equipment breakdown.

Question 3

Class II hazardous locations are defined by the presence of:

Accepted Answer

Combustible dusts

Answer

Class II locations are hazardous because of the presence of combustible dust that can form ignitable mixtures with air.

Question 4

Class III hazardous locations involve which type of hazardous material?

Accepted Answer

Easily ignitable fibers or flyings

Answer

Class III locations are hazardous because of the presence of easily ignitable fibers or flyings that are handled, manufactured, or used.

Question 5

Which NEC article covers Class I hazardous locations using the Zone classification system?

Accepted Answer

Article 505

Answer

NEC Article 505 covers Class I, Zone 0, Zone 1, and Zone 2 hazardous locations as an alternative to the Division system in Article 500.

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