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3.2.1* Approved. correct answers Acceptable to the authority having jurisdiction. 3.2.2* Code. correct answers A standard that is an extensive compilation of provisions covering broad subject matter or that is suitable for adoption into law independently of other codes and standards. 3.2.3* ...

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  • October 13, 2024
  • 10
  • 2024/2025
  • Exam (elaborations)
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NFPA 921 || with 100% Verified Solutions.
3.2.1* Approved. correct answers Acceptable to the authority having jurisdiction.

3.2.2* Code. correct answers A standard that is an extensive compilation of
provisions covering broad subject matter or that is suitable for adoption into law independently
of other codes and standards.

3.2.3* Guide. correct answers A document that is advisory or informative in
nature and that contains only non-mandatory provisions. A guide may contain mandatory
statements such as when a guide can be used, but the document as a whole is not suitable for
adoption into law.

3.2.4* Recommended Practice. correct answers A document that is similar in
content and structure to a code or standard but that contains only non-mandatory provisions
using the word "should" to indicate recommendations in the body of the text.

3.2.5* Standard. correct answers An NFPA Standard, the main text of which
contains only mandatory provisions using the word "shall" to indicate requirements and that is in
a form generally suitable for mandatory reference by another standard or code or for adoption
into law. Non-mandatory provisions are not to be
considered a part of the requirements of a standard and shall be located in an appendix, annex,
footnote, informational note, or other means as permitted in the NFPA Manual of Style.
When used in a generic sense, such as in the phrase "standards development process" or
"standards development activities," the term "standards" includes all NFPA Standards, including
Codes, Standards, Recommended Practices, and Guides.

3.3.1* Absolute Temperature. correct answers A temperature measured in Kelvins (K) or
Rankines (R).

3.3.2 Accelerant. correct answers A fuel or oxidizer, often an ignitible liquid,
intentionally used to initiate a fire or increase the rate of growth or spread of fire.

3.3.3 Accident correct answers 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.

3.3.4 Active Fire Protection System. correct answers A system that uses moving mechanical or
electrical parts to achieve a fire protection goal.

3.3.5 Ambient. correct answers Someone's or something's surroundings, especially
as they pertain to the local environment; for example, ambient air and ambient temperature.

3.3.6 Ampacity. correct answers The maximum current, in amperes, that a
conductor can carry continuously under the conditions of use without exceeding its temperature
rating. [70, Article 100]

, 3.3.7 Ampere. correct answers 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.

3.3.8 Arc. correct answers A high-temperature luminous electric discharge
across a gap or through a medium such as charred insulation.

3.3.9 Arc Mapping. correct answers 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.

3.3.10 Arc Site. correct answers The location on a conductor with localized
damage that resulted from an electrical arc.

3.3.11 Arcing Through Char. correct answers Arcing associated with a matrix
of charred material (e.g., charred conductor insulation) that acts as a semi-conductive medium.

3.3.12 Area of Origin. correct answers 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. (See also 3.3.142, Point of Origin.)

3.3.13 Arrow Pattern. correct answers A fire pattern displayed on the cross section
of a burned wooden structural member.

3.3.14 Arson. correct answers The crime of maliciously and intentionally, or
recklessly, starting a fire or causing an explosion.

3.3.15 Auto ignition. correct answers Initiation of combustion by heat but
without a spark or flame.

3.3.16 Autoignition Temperature. correct answers The lowest temperature at which a
combustible material ignites in air without a spark orflame.

3.3.17 Backdraft. correct answers A deflagration resulting from the sudden
introduction of air into a confined space containing oxygen deficient products of incomplete
combustion.

3.3.18 Bead. correct answers A rounded globule of re-solidified metal at the
end of the remains of an electrical conductor that was caused by arcing and is characterized by a
sharp line of demarcation between the melted and unmelted conductor surfaces.

3.3.19 Blast Pressure Front. correct answers The expanding leading edge of an explosion
reaction that separates a major difference in pressure between normal ambient pressure ahead of
the front and potentially damaging high pressure at and behind the front.

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