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

Combustible dust

Answer

Easily ignitable fibers

Answer

Radioactive materials

Question 2

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

Accepted Answer

Under normal operating conditions

Answer

Only under abnormal conditions

Answer

Only during maintenance shutdowns

Answer

Only in outdoor environments

Question 3

Class II hazardous locations are defined by the presence of:

Accepted Answer

Combustible dusts

Answer

Flammable gases

Answer

Ignitable fibers or flyings

Answer

Flammable liquids only

Question 4

Class III hazardous locations involve which type of hazardous material?

Accepted Answer

Easily ignitable fibers or flyings

Answer

Flammable vapors

Answer

Combustible dust clouds

Answer

Explosive gases under pressure

Question 5

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

Accepted Answer

Article 505

Answer

Article 500

Answer

Article 510

Answer

Article 516

Question 6

In a Class II, Division 1 location, combustible dust is present:

Accepted Answer

In suspension or dangerous accumulations under normal conditions

Answer

Only during equipment failure

Answer

Only outdoors in open spaces

Answer

Solely as settled deposits on surfaces

Question 7

A grain elevator storage area would most typically be classified as:

Accepted Answer

Class II, Division 1

Answer

Class I, Division 1

Answer

Class III, Division 2

Answer

Class I, Division 2