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This paper explores an analytical method developed
during the course of a forensic engineering examination of an electrical fire
fatality. Abstract—Guidance for predicting the
ampacity of small-gauged conductors is not readily available and not addressed
in the authoritative National Electric Code. While the Code and manufacturers
provide definitive tables of ampacities, an analytical method is helpful.
Increasingly, reliability and safety personnel are interested in ampacities of
appliance and extension cords. The interest may be the result of product design,
insurance, legal or forensic involvement. Because fire is a potential result,
the First Law of Thermodynamics is an excellent starting point for a useful
analytical tool.
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