NFPA 921 Fire and explosion investigations Questions and Answers
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Module
NFPA 921
Institution
NFPA 921
Absolute Temperature
Ans- A temperature measured in Kelvins (K) or Rankines (R).
Accelerant
Ans- A fuel or oxidizer, often an ignitible liquid, intentionally used to initiate a
fire or increase the rate of growth or spread of fire.
Accident
Ans- An unplanned event that interrupts an activity...
NFPA 921 Fire and
explosion investigations
Questions and Answers
Absolute Temperature
Ans- A temperature measured in Kelvins (K) or Rankines (R).
Accelerant
Ans- A fuel or oxidizer, often an ignitible liquid, intentionally used to initiate a
fire or increase the rate of growth or spread of fire.
Accident
Ans- An unplanned event that interrupts an activity and sometimes causes
injury or damage or a chance occurrence arising from unknown causes; an
unexpected happening due to carelessness, ignorance, and the like.
,Active Fire Protection System
Ans- A system that uses moving mechanical or electrical parts to achieve a fire
protection goal.
Ambient
Ans- Someone's or something's surroundings, especially as they pertain to the
local environment; for example, ambient air and ambient temperature.
Ampacity
Ans- The maximum current, in amperes, that a conductor can carry
continuously under the conditions of use without exceeding its temperature
rating.
Ampere
Ans- The unit of electric current that is equivalent to a flow of one coulomb
per second; one coulomb is defined as 6.24 × 1018 electrons.
,Arc
Ans- A high-temperature luminous electric discharge across a gap or through a
medium such as charred insulation.
Arc Mapping
Ans- The systematic evaluation of the electrical circuit configuration, spatial
relationship of the circuit components, and identification of electrical arc sites
to assist in the identification of the area of origin and analysis of the fire's
spread.
Arc Site
Ans- The location on a conductor with localized damage that resulted from an
electrical arc.
Arcing Through Char
Ans- Arcing associated with a matrix of charred material (e.g., charred
conductor insulation) that acts as a semiconductive medium.
, Area of Origin
Ans- A structure, part of a structure, or general geographic location within a
fire scene, in which the "point of origin" of a fire or explosion is reasonably
believed to be located.
Arrow Pattern
Ans- A fire pattern displayed on the cross- section of a burned wooden
structural member.
Arson
Ans- The crime of maliciously and intentionally, or recklessly, starting a fire or
causing an explosion.
Autoignition
Ans- Initiation of combustion by heat but without a spark or flame.
Autoignition Temperature
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