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Answer Posted / arup
ZONE 0 --Areas in which an explosive gases atmosphere (An
explosive gas air mixture) is present continuously or
present for long time.
ZONE 1---An area in which explosives gas atmosphere is
likely to occur in normal operation.
ZONE 2--An area in which an explosive gas atmosphere is not
likely to occur in normal operation and if it does occur,
it will exist for a short period only.
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