Question 9001 of 844 · Washington 01 Journey Level Electrician Exam
A room where flammable gases or vapors from flammable liquids may be present in quantities sufficient to produce an ignitible mixture is classified as which class?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 9001
- D: Class I
Explanation
Class I locations are those where flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors may be present in ignitible concentrations. Class II covers combustible dust and Class III covers ignitible fibers and flyings. The NEC has no Class IV.
More questions: Special Occupancies
- 9002A location is hazardous because of the presence of combustible dust. Which class applies under the class and division system?
- 9003A cotton gin where easily ignitible fibers are handled, but not normally suspended in the air in ignitible quantities, is generally classified as which class?
- 9004In a Class I location, what distinguishes a Division 2 area from a Division 1 area?
- 9005Under the zone system for flammable gases and vapors, which zone describes a location where ignitible concentrations are present continuously or for long periods?
- 9006Zone 20, Zone 21, and Zone 22 classifications are used for which hazard?
- 9007Gasoline and propane are placed in which material group for Class I locations?