Combustible Metal Dust as Defined by the NEC

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 thei

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