The Flameproof classification is a type of protection in which the parts that can ignite in an explosive atmosphere are placed within an enclosure that can withstand the force created and pressure developed during an internal explosion.
Description
Specification
The “Flameproof” concept is that should an explosion occur, within the plug assembly, it will either be contained or the escaping flame will be cooled by a “flame-path” thus mitigating the risk of igniting an explosive outside atmosphere.