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