ANSI/ISA-60079-25 (12.02.05)-2011 Explosive Atmospheres - Part 25: Intrinsically safe electrical systems

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This standard contains the specific requirements for construction and assessment of intrinsically safe electrical systems, type of protection “i”, intended for use, as a whole or in part, in Class I, Zone 0, 1, or 2, or Zone 20, 21, or 22 hazardous (classified) locations as defined by the National Electrical Code® (NEC), ANSI/NFPA 70®.