Industry Standards:For A1001YZUMC1 (Volume up to 2 cubic feet) NEC Type Y Class I, Division 1, Groups A, B, C and D to Division 2 NEC Type Z Class I, Division 2, Groups A, B, C and D to Unclassified
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Small-Volume Purging/Pressurization Systems are an alternative to NEMA Type 7 or 9 enclosures. The C1 model allows general-purpose enclosures, up to two cubic feet, to be used in certain Class 1 hazardous locations. The C2 model allows general purpose enclosures, up to 10 cubic feet, to be used in certain Class 2 hazardous locations.