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Vytenis Babrauskas, Ph.D

Abstract

Arc mapping was first introduced in the 2001 edition of NFPA 921 and was subsequently expanded so that in the recent editions it constitutes one of the four main methods for determining the origin of a fire. Careful consideration of engineering principles and large-scale experimental studies on the subject indicates that the relevance and prominence of arc mapping as a leading indicator of fire origin is greatly overstated. The technique is valid and applicable only in some very limited scenarios. Yet it has seen very extensive use in recent years by investigators preparing fire reports. In many cases, such attempted use of arc mapping is based on incorrect and invalid hypotheses, which are often implicitly assumed to be true instead of being explicitly stated. The following are myths: (i) An abundance of arc beads at a given locale means that fire originated in that area, while a paucity of arc beads indicates that it did not. (ii) When multiple arcs are present on a circuit, the direction of arcing will necessarily proceed upstream towards the power source. (iii) If an appliance is the victim of a fire, internal arcing will be primarily near the exterior of the unit, while arcing deep inside indicates a fire origin at that place. NFPA is urged to revise NFPA 921 to eliminate arc mapping as one of the four main methods for establishing fire origin, and to subsume it under the more general category of “fire patterns.” In addition, it is important that NFPA 921 reduce the implied general utility of the method and provide more explicit information on its interpretation and its limitations and on the circumstances under which it may be a valid method for assisting in the determination of the fire origin.

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Vytenis Babrauskas, Ph.D.

Abstract

Short circuits to building wiring can happen due to electrical mishaps, or as a result of fire impinging on the wiring. In either case, this may cause arcing.  It is sometimes erroneously assumed that this must produce signs of ‘electrical activity,’ which is a term often used by fire investigators to mean discernable arc marks or arc beads.  While such artifacts may indeed be produced, it is shown that it does not necessarily happen in every case.  Shorting and arcing (whether due to fire or due to an accident) may occur without leaving physical evidence that is discernable as an arc bead.  Ejecta also may, but do not have to be produced.  Some variables have been identified which can influence the size of arc beads, when arc beads are produced.  But stochastic aspects dominate, and no predictive correlations can be expected.  It is also shown that there are no prediction methods available to establish if an arc locale will result in severing or welding together of conductors.

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From Out of the Abyss...

This week’s article from the past is titled Incendiary Fires Can Be Spotted and was written by Benjamin Horton, CPCU, who was President of the National Adjuster Traing School in Louisville, Kentucky..  It is taken from the Decembe 1968 Vol. XVI No.5 issue.

Incendiary Fires Can Be Spotted 

In the new issue of NFPA Journal®, President Jim Shannon said the Association will focus on the leading causes of home fires, including cooking. "We also need to continue to push hard for home fire sprinklers. That's still a large priority for NFPA, and we plan to work very aggressively in 2014 on our residential sprinkler initiative," he said.

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From: The Desk of Scotty Baker

To: The CCAI Training Committee

Thank You

Over the last several training seminars, even as an old hand, I have learned new information concerning fires and how they do what they do.

 

Get started today

Attention - CCAI's next training seminar is scheduled for March 6-8, 2017 - Attention

The focus will be on Interviewing, Report Writing and Fundamentals

Register now online or Fill out the registration form and email, mail or fax it

             Group-photo-web_10-2016

 

Development of Standardized Cooking Fires For Evaluation of Prevention Technologies

Fire Protection Research Foundation report: "Development of Standardized Cooking Fires for Evaluation of Prevention Technologies: Data Analysis"
Authors: Joshua Dinaburg, Daniel Gottuk – Hughes Associates, Inc.

July 2014 report

Beginning in 2010, the Foundation began a program to review the potential effectiveness of various technologies potentially capable of preventing cooking range top fires. A workshop conducted as part of that project considered the emergence of commercial products on the market and identified the need to develop standardized tests and criteria to evaluate the performance and effectiveness of such devices. This report summarizes and analyzes the results of two live fire test series conducted to form the basis for such a test protocol.

pdf Download the report.  (PDF, 5 MB) pdf Download the executive summary. (PDF, 20 KB)

October 2013 report

Cooking-equipment related fires are a leading cause of U.S. fire loss. Beginning in the mid 1980’s, the National Institute of Standards and Technology, Consumer Product Safety Commission, and home appliance industry undertook a comprehensive review of strategies to mitigate death, injury and property loss from cooking fires. All strategies were engineering strategies defined by a condition to be detected (e.g., overheat of pan or food in pan, absence of person actively engaged in cooking process, early-stage fire on stovetop) and an action to be taken (e.g., shut off cooking heat, sound alarm, suppress fire). As part of this study, a comprehensive review of existing technologies was done.

In 2010, the Foundation conducted a study supported by NIST to develop this action plan. The study focused particularly on prevention technologies suitable for use on or with home cooking appliances. and consisted of a literature and technology review; the development of an enhanced technology evaluation methodology based on an in-depth review of cooking fire statistics; and the evaluation of currently available technologies using this methodology. The project culminated with a one day workshop of 35 leaders from the kitchen appliance, fire service, and user communities who met to review the above findings and identify gaps in information. The highest priority action item identified at that workshop toward implementation of commercially available cooking fire mitigation technologies was: "Develop standard fire scenarios and create test methods and performance criteria which can feed into standards development"

This report presents the results of a follow on project sponsored by NIST to gather data towards this goal.

pdf Download the report.  (PDF, 2 MB)

NHTSA Recall - Cooling Fan Resistor May Melt

SUMMARY:

Kia Motors America (Kia) is recalling certain model year 2014 Kia Forte vehicles manufactured December 5, 2012, to April 17, 2014. In the affected vehicles, the cooling fan resistor may overheat and melt.

See full details at NHTSA

Fire Investigation 101

OnlineFireScienceDegree.org has just published a collection of their favorite fire investigation sites and the California Conference of Arson Investigators is listed: http://onlinefiresciencedegree.org/fire-investigation/.

This site has loads of information and resources for education in the field of fire investigations.

Wind Driven Fires

Wind blowing into the broken window of a room on fire can turn a "routine room and contents fire" into a floor-to-ceiling firestorm. Historically, this has led to a significant number of firefighter fatalities and injuries, particularly in high-rise buildings where the fire must be fought from the interior of the structure.

Wind-Driven Fire in a Ranch-Style House in Texas, 2009

On April 12, 2009, a fire in a one-story ranch home in Texas claimed the lives of two fire fighters.  Sustained high winds occurred during the incident.  The winds caused a rapid change in the dynamics of the fire after the failure of a large section of glass in the rear of the house.

Wind Driven Fire in Home, Texas, 2009. Aerial view of damage to the structure. Photo credit: Houston Fire Department.

Wind Driven Fire in Home, Texas, 2009. Aerial view of damage to the structure. Photo credit: Houston Fire Department.

NIST performed computer simulations of the fire using the Fire Dynamic Simulator (FDS)  and Smokeview, a visualization tool, to provide insight on the fire development and thermal conditions that may have existed in the residence during the fire.

Read more...

NBC News - Trial by Fire

Visit NBCNews.com for breaking news, world news, and news about the economy

More Articles...

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