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Electrical Fires and NFPA 921 Chris W. Korinek Electrical overheating can occur in so many different ways that it can be difficult to organize an investigation for an electrical cause. In an investigation, many electrical devices may need to be analyzed.  In addition, each device is generally capable of causing undesired heating in more than one way. During the investigation various electrical overheating modes may be ruled out and if the evidence is sufficient, an electrical overheating mode may be identified in the fire causation hypothesis. Section 6 of NFPA 921, Guide for Fire and Explosion Investigations, 2001, “Electricity and Fire” is a very helpful section that describes phenomena that explain how electrical current can overheat and cause a fire.  [Complete Article]	A parallel parting arc (PPA)

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