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ANSI/ISA 12.12.02-2012
Explosive Atmospheres û Part 15: Equipment protection by type of protection ônö (4th Edition)
This standard specifies requirements for the construction, testing and marking for Group II electrical apparatus with type of protection "n" intended for use in Class I, Zone 2 hazardous (classified) locations as defined by the National Electrical Coder (NECr), ANSI/NFPA 70.
The International Society of Automation [isa]