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Arc Flash Warning Labels help you meet the National Electric Code (NEC) 2002 110.16, National Fire Protection Association (NFPA) 70E-2000, and ANSI Z535.4-1998 by posting warning labels for potentially hazardous arcing faults while working on or near energized electrical equipment. These labels, or some variation, are now required on the exterior of most high voltage enclosures. These labels serve only as a warning, and are no substitute for appropriate work practices and the wearing proper personal protective equipment.