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  What does the zone in the explosion-proof level mean?  
     
  Gas explosion environment:

Zone 0: Permanent or prolonged presence of explosive gases
Zone 1: Occasional occurrence of explosive gases
Zone 2: Only a small amount of explosive gas appears in a short period of time


Dust explosion environment:

Zone 20: Permanent or prolonged presence of explosive dust
Zone 21: Occasional occurrence of explosive dust
Zone 22: Only a small amount of explosive dust appears in a short period of time 		 
     
     
 
     
 
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