What class of electrical hazard classifications is used to identify combustible dust that can be present in amounts that could produce potentially explosive mixtures?
A. Class I
B. Class II
C. Class III
D. Class IV
A. Incorrect. Class I identifies gases, vapors, and liquids that can be present in explosive or ignitable mixtures.
B. Correct. Class II identifies combustible dust that can be present in amounts that could produce potentially explosive mixtures.
C. Incorrect. Class III identifies fibers that are easily ignitable.
D. Incorrect. There are only three electrical hazard classifications.
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