NFPA 499 化学工艺区易燃粉尘的分类及电气安装危险性分类推荐做法
日期:2012-02-09 16:43
ss areas. As used in this document, a chemical process area could be a chemical process plant, or it could be a part of such a plant. A chemical process area could be a part of a manufacturing facility where combustible dusts are produced or used in chemical reactions, or are handled or used in operations such as mixing, coating, extrusion, conveying, drying, and/or grinding.
1.1.4 This recommended practice does not apply to agricultural grain-handling facilities except where powdered grain is
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