The national standard GB 50058-92 stipulates that explosive gas dangerous places are divided into three levels according to the degree of danger, and there are three levels: 0, 1 and 2, and the explosive dust dangerous places are divided into 0 and 11 zones.
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Explosive substance
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Regional division
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Regional definition
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gas
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Zone 0
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Environment in which continuous or long-term explosive gas mixtures occur
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Zone 1
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An environment in which explosive gas mixtures may occur during normal operation
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Zone 2
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An environment in which an explosive gas mixture is unlikely to occur during normal operation or an environment in which only an explosive gas mixture exists for a short period of time
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dust
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Zone 20
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An environment in which an explosive dust mixture occurs continuously or in a long period of time.
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Zone 21
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An environment where explosive dust mixtures may occur during normal operation.
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Zone 22
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An environment in which an explosive dust mixture is unlikely to occur during normal operation or an environment in which only an explosive dust mixture is present for a short period of time.
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