A type of protection in which an enclosure can withstand the pressure developed during an internal explosion of an explosive mixture and that prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure and that operates at such an external temperature that a surrounding explosive gas or vapour will not be ignited...Continue Reading
Zone 21 is an area in which combustible dust is likely to occur in normal operation, and Zone 22 is an area in which combustible dust is not likely to occur in normal operation and, if it occurs, will exist only for a short period.Continue Reading