Description
An explosive atmosphere is one where mixture with air under atmospheric conditions of flammable substances in the form of gas, vapour or mist, exists in such proportion that may explode due to excessive temperature, arcs or sparks.
Flameproof motors one manufactured with an enclosure constructed in such a manner that any explosion inside is not capable of igniting an explosive atmosphere outside the enclosure and the surface temperature is safe enough not to ignite the outside explosive atmosphere.
Zones
Hazardous areas have been classified into three zones as follows :
Zone 0 in which on explosive gasair mixture is continuously present or present for long periods. N.B. No motors may be used in Zone 0.
Zone 1 in which an explosive gasair mixture is likely to occur in normal operation.
Zone 2 in which an explosive gasair mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time. By implication an area other than zone 0, 1 or 2 is deemed to be a
non-hazardous or safe area.
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