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Classification around digester gas storage

Question asked by kzhang on Jun 30, 2020

Classification around digester gas storage:

NFPA 820-2020 calls for Division 1 within 3m around digester gas storage tanks, valve, etc. However, there is no requirements on Division 2. 

NEC specifies that there must be a Division 2 between Division 1 and unclassified area. So what's the requirements for Division 2?

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