Question 9009 of 790 · California General Electrician Exam
An atmosphere containing combustible magnesium or aluminum dust is assigned to which Class II group?
Exactly one answer is correct.
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Correct answer to question 9009
- B: Group E
Explanation
Group E covers combustible metal dusts such as aluminum and magnesium. Group F covers carbonaceous dusts like coal, and Group G covers other dusts such as flour, grain, starch, and plastics.
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