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This Technical Report provides guidance on the safe use of fiber optic systems and theirconstituent parts producing or guiding visible, near infrared, or mid infrared (maximumwavelength of 10 micrometers) radiation in Class I hazardous (classified) locations. Hazardous(classified) locations are described in the National Electrical Code (NEC). Limiting levelsprescribed in this document apply only to the minimum levels of optical power, optical powerdensity, and optical energy needed to ignite explosive gas atmospheres. In apparatus whereoptical energy is transduced to electrical energy, the limiting values for the electrical energy must be determined from relevant standards for electrical apparatus (e.g. ANSI/ISA-12.00.01).
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