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Controlling Physical Hazards <br /> Explosion-proof apparatus : <br /> • Apparatus enclosed in a case that is capable of <br /> withstanding an explosion of a specified gas or <br /> vapor that may occur within it and of preventing <br /> the ignition of a specified gas or vapor <br /> surrounding the enclosure by sparks, flashes or <br /> explosion of the gas or vapor within, and that <br /> operates at such an external temperature that it <br /> will not ignite a surrounding flammable <br /> atmosphere. <br />