A place where the explosive atmosphere of flammable gas is present continously or for a period of frequently
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A place where the explosive atmosphere of flammable gas is likely to occur in normal operation occasionally
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A place where the explosive atmosphere of flammable gas is not likely to occur in normal operation, but if it does occur it will only be present for a short period
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A place where an explosive dust atmosphere is present continuosly or for a long period of time
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A place where an explosive dust atmosphere is likely to occur during normal operation
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A place where an explosive dust atmosphere is not likely to occur during normal operation, but if it does occur it will be present for a short period
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