Explosion proof, according to the National Electrical Code, applies to an apparatus enclosed in a case that is capable of withstanding a gas or vapor explosion. … Explosion Proof means that should an explosion occur, it will be contained within an enclosure.
During an explosion, gases escape through any paths or openings that exist in the enclosure. Explosion-proof enclosures are designed so that escaping gases will be sufficiently cooled as they exit through openings that are long in proportion to their width.
To meet the criteria for the explosion proof rating, an enclosure must be able to contain any explosion originating within its housing and prevent sparks from within its housing from igniting vapors, gases, dust, or fibers in the air surrounding it.
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