• Combustible Metal Dust as Defined by the NEC

    Definition of Group E combustible dust mixture as defined by the 2011 NEC.
    April 23, 2014

    An atmosphere classified as hazardous Group E contains combustible metal dusts.

    a) True
    b) False

    See answer and applicable Code reference

    The correct answer is: a) True

    For purposes of testing, approval, and area classification, the Code groups various air mixtures and presents them in Sec. 500.6 of the 2011 NEC. As noted in 500.6(B)(1), Group E is defined as "Atmospheres containing combustible metal dusts, including aluminum, magnesium, and their commercial alloys, or other combustible dusts whose particle size, abrasiveness, and conductivity present similar hazards in the use of electrical equipment."

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