Question 9005 of 749 · Maryland Journeyperson Electrician Exam
Under the zone system for flammable gases and vapors, which zone describes a location where ignitible concentrations are present continuously or for long periods?
Exactly one answer is correct.
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Correct answer to question 9005
- B: Zone 0
Explanation
Article 505 divides Class I locations into Zone 0, Zone 1, and Zone 2. Zone 0 is the most severe, with ignitible concentrations present continuously or for long periods. Zone 20 belongs to the dust zone system of Article 506.
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