Article 503 is the third in the series of Class X Location Articles. These can be summarized as: Article 501, Class I Locations. Gases. Article 502, Class II Locations. Liquids. Article 503, Class III ...
Of the three types of Hazardous Locations, Class III has the least stringent requirements. Fibers (and flyings) have a much larger particle size than dust (Class II) or gases (Class I). That makes ...
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