Hazardous locations are defined as premises, buildings or parts where fire or explosion hazards may exist due to the presence of flammable gases or vapors, flammable liquids, combustible dusts, or easily ignitable fibers or flyings.
Flammable gases, vapours and combustible dusts exist almost everywhere, but are usually present only in minute quantities.
Their presence does not necessarily mean a location is hazardous. The quantities or concentrations must be sufficient to present a potential explosion hazard.
The electrical codes that deal with these types of hazardous locations areas do not cover materials such as high explosives, including dynamite, munitions or fireworks. These are covered by other regulations.
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