Definition - What does Explosion Proof mean?
The term explosion proof refers to products that are capable of containing an explosion. It does not, however, indicate that the product is capable of withstanding an internal explosion without allowing flames or hot gases to escape and initiate an explosion in the adjacent atmosphere. The term explosion proof must be assigned to the products that are certified by competent authorities after passing prescribed tests.
Safeopedia explains Explosion Proof
The term explosion proof describes electrical and non-electrical fixtures that can prevent explosions from occurring, and withstand explosions when they occur. An electrical product that is marked explosion proof means that this product has an apparatus enclosed in a case that is capable of withstanding an explosion of a specific gas or vapor that may occur within it. It also has the capability of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that it operates at such an external temperature that a surrounding flammable atmosphere will not be ignited as per National Fire Protection Association (NFPA) USA, under Standard No. 70, Article 100, of the National Electric Code.
An explosion proof product is usually housed in a frame made of cast aluminum or stainless steel, engineered and constructed to contain a flash or explosion. To fulfill an explosion proof rating, an enclosure should 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.