Hazardous location classification questions on the electrical exam address classes, divisions and zones. Can you answer the following question with ease?
Question:
Is a location in which ignitible concentrations of combustible dust or ignitible fibers/flyings are present continuously, and or ignitible concentrations of combustible dust or ignitible fibers/flyings are present for long periods of time classified as a Zone 20, 21, or 22 location?
Solution:
According to NFPA 70, Article 506.5 Classification of Locations, Zones 20, 21 and 22 are all classified as locations in which either ignitible concentrations of combustible dust or ignitible fibers/flyings are present continuously and or ignitible concentrations of combustible dust or ignitible fibers/flyings are present for long periods of time.
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