Ch 13-14 Flashcards
(100 cards)
Why is fire cause determination important?
To understand past fire causes for prevention and establish responsibility for criminal acts or negligence.
Who is responsible for NFIRS reporting?
The Incident Commander, who may delegate to the first-arriving company officer.
When is a formal fire investigation required?
For fires with serious injuries, fatalities, suspected arson, or per AHJ criteria.
What standard defines fire investigator qualifications?
NFPA 1033, Standard for Professional Qualifications for Fire Investigator.
What guide governs fire investigations?
NFPA 921, Guide for Fire and Explosion Investigations.
What is the fire officer’s role in fire cause determination?
Document conditions, preserve evidence, note unusual situations, and report findings.
When should overhaul be delayed?
If a fire requires a fire investigator or is a possible crime scene to preserve evidence.
Which fires typically don’t require an investigator?
Minor accidental fires, scalding burns, minor car fires, or juvenile-caused fires.
What incidents require a fire investigator per Phoenix SOP?
First alarm structural fires, serious injuries/fatalities, attempted arsons, bombings, explosions.
What is the scientific method in fire investigation?
Recognizing a problem, collecting data, analyzing data, testing hypotheses, selecting a final hypothesis.
What is the first step in fire cause determination?
Identifying the area of origin where a heat source and fuel first interacted.
How is the area of origin determined?
By examining fire patterns, witness accounts, fire physics/chemistry, and electrical arcing locations.
What is a fire pattern?
Physical marks like V- or U-shapes indicating fire movement or intensity.
What does a V-shaped fire pattern indicate?
The base typically points to the fire’s origin.
What is an intensity pattern?
Shows how much heat was transferred, indicating areas of greatest heat production.
What is char in fire investigation?
Burned or pyrolyzed carbonaceous material with a blackened appearance.
How does char depth help in fire investigation?
Deeper char often indicates longer burning, closer to the area of origin.
What are the three steps to determine fire cause?
Identify ignition source, material first ignited, and circumstances bringing them together.
What is a competent ignition source?
One that generates, transmits, and sustains enough heat to ignite fuel.
What is the difference between type and form of material?
Type is the material’s nature (e.g., cotton); form is its use (e.g., cloth).
Why is fuel configuration important?
It affects ignition ease, like wood shavings igniting faster than a beam.
What is failure analysis?
Systematic examination to identify causes and consequences of device or system malfunctions.
What is fire analysis?
Determining origin, cause, development, responsibility, and failure analysis of a fire.
How should interviews be conducted?
Separately with individuals to avoid influence, using open-ended questions initially.