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Improved Method for Arc Flash Hazard Analysis
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From Ferraz Shawmut
Conventional arc flash hazard calculators use simple formulae to calculate the flash protection boundary and the incident energy density, but these methods do not represent the effects of the power supply system correctly. A new method is described which models the transient response of a 3-phase power system and its interaction with an arcing fault. The operation of current-limiting fuses in the time domain, and the focusing effect of the equipment enclosure are also considered. The 2002 edition of the NEC requires equipment, on which work may be required to be done when energized, to be labeled, warning of arc flash hazard. The draft 2004 edition of NFPA 70E requires a flash hazard analysis to be done before a person can work near to energized equipment, and to determine the type of protective clothing needed Products & Services
Fuses protect electrical devices and components from overcurrents and short circuits that occur in improperly operating circuits.
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Topics of Interest
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The National Electric Code (NEC) has been requiring an arc flash assessment for a few years now, but Utilities do not have to abide by NEC. However, now that the 2007 edition of NESC requires an arc...
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