Question 9001 of 749 · Maryland Journeyperson 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.
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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.
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- 9002A location is hazardous because of the presence of combustible dust. Which class applies under the class and division system?
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