A flameproof enclosure’s effectiveness stems from its ability to contain flames within, bahkan ketika terjadi ledakan di dalam casing peralatan listrik. Penahanan ini dipastikan dengan mencegah api keluar melalui berbagai permukaan sambungan.
Kepatuhan terhadap standar khusus mengenai kesenjangan tersebut, panjang, and surface roughness of these joints is crucial. These gaps not only extinguish the flames but also cool them effectively. They reduce the temperature of the flames passing through to a level insufficient for igniting any eksplosif mixtures that may be present outside the enclosure.