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NFPA 921: Guide for Fire and Explosion Investigations, 2024
- Important Notices and Disclaimers
- Additional Notices and Disclaimers
- Chapter 1 Administration [Go to Page]
- 1.1 Scope.
- 1.2 Purpose.
- 1.3 Application.
- 1.4 Units of Measure.
- 1.5 Measurement Uncertainty.
- Chapter 2 Referenced Publications [Go to Page]
- 2.1 General.
- 2.2 NFPA Publications.
- 2.3 Other Publications.
- 2.4 References for Extracts in Advisory Sections.
- Chapter 3 Definitions [Go to Page]
- 3.1 General.
- 3.2 NFPA Official Definitions.
- 3.3 General Definitions.
- 3.4 Canine Definitions.
- 3.5 Terminology Specific to Wildfire Investigations.
- Chapter 4 Basic Methodology [Go to Page]
- 4.1 Nature of Fire Investigations.
- 4.2 Systematic Approach.
- 4.3 Relating Fire Investigation to the Scientific Method.
- 4.4 Basic Method of a Fire Investigation.
- 4.5 Expert Opinions.
- 4.6 Review Procedure.
- 4.7 Reporting Procedure.
- Chapter 5 Basic Fire Science [Go to Page]
- 5.1 Introduction.
- 5.2 Chemistry.
- 5.3 Products of Combustion.
- 5.4 Fluid Flows.
- 5.5 Heat Transfer.
- 5.6 Fuel Load, Fuel Packages, and Properties of Flames.
- 5.7 Ignition.
- 5.8 Flame Spread.
- 5.9 Fire Spread in a Compartment.
- 5.10 Compartment Fire Development.
- 5.11 Fire Spread Between Compartments.
- 5.12 Paths of Fire and Smoke Spread Through Buildings.
- 5.13 Paths of Smoke Spread in Buildings.
- Chapter 6 Fire Effects and Fire Patterns [Go to Page]
- 6.1 Introduction.
- 6.2 Fire Effects.
- 6.3 Fire Patterns.
- 6.4 Fire Pattern Generation.
- 6.5 Fire Pattern Geometry.
- 6.6 Fire Effects on Electrical Systems and Components.
- 6.7 Pointer and Arrow Patterns.
- 6.8 Impact of Firefighting Actions.
- Chapter 7 Building Systems [Go to Page]
- 7.1 Introduction.
- 7.2 Features of Design, Construction, and Structural Elements in Evaluating Fire Development.
- 7.3 Types of Construction.
- 7.4 Construction Assemblies.
- 7.5 Construction Materials.
- 7.6 Impact of Passive Fire Protection Systems on Investigation.
- 7.7 Design and Installation Parameters of the System.
- 7.8 Documentation and Data Collection.
- 7.9 Analysis.
- 7.10 Heating Systems.
- Chapter 8 Active Fire Protection Systems [Go to Page]
- 8.1 Introduction.
- 8.2 Documentation of Fire Protection Systems.
- 8.3 Fire Alarm Systems.
- 8.4 Water-Based Fire Suppression Protection Systems.
- 8.5 Non-Water-Based Fire Protection Systems.
- 8.6 Spoliation Issues.
- Chapter 9 Electricity and Fire [Go to Page]
- 9.1 Introduction.
- 9.2 Basic Electricity.
- 9.3 Building Electrical Systems.
- 9.4 Service Equipment.
- 9.5 Grounding.
- 9.6 Overcurrent Protection.
- 9.7 Branch Circuits.
- 9.8 Outlets and Devices.
- 9.9 Ignition by Electrical Energy.
- 9.10 Interpreting Damage to Electrical Systems.
- 9.11 Identification of Damaged Conductors.
- 9.12 Electrical System Examination.
- 9.13 Arc Surveys.
- 9.14 Static Electricity.
- 9.15 Lithium Ion Batteries.
- Chapter 10 Building Fuel Gas Systems [Go to Page]
- 10.1 Introduction.
- 10.2 Fuel Gases.
- 10.3 Natural Gas Systems.
- 10.4 LP-Gas Systems.
- 10.5 Common Fuel Gas System Components.
- 10.6 Common Piping in Buildings.
- 10.7 Common Appliance and Equipment Requirements.
- 10.8 Common Fuel Gas Utilization Equipment.
- 10.9 Investigating Fuel Gas Systems Incidents.
- Chapter 11 Fire-Related Human Behavior [Go to Page]
- 11.1 Introduction.
- 11.2 History of Research.
- 11.3 General Considerations of Human Responses to Fires.
- 11.4 Factors Related to Fire Initiation.
- 11.5 Youth Fire-Setting Behavior.
- 11.6 Incendiary Fires.
- 11.7 Human Factors Related to Fire Spread.
- 11.8 Recognition and Response to Fires.
- Chapter 12 Legal Considerations [Go to Page]
- 12.1 Introduction.
- 12.2 Constitutional Considerations.
- 12.3 Legal Considerations During the Investigation.
- 12.4 Pretrial Legal Considerations.
- 12.5 Trials.
- Chapter 13 Fire Investigator Safety, Health, and Wellness [Go to Page]
- 13.1 General.
- 13.2 Application of the Scientific Method to Scene Safety.
- 13.3 Hazard Identification, Risk Assessment, and Mitigation.
- 13.4 Risk Assessment and Evaluation.
- 13.5 Hazard Exposure.
- 13.6 Exposure Effects.
- 13.7 Risk Mitigation Methods.
- 13.8 Other Safety Equipment.
- 13.9 Decontamination.
- 13.10 Site-Specific Safety and Emergency Action Plans.
- 13.11 First Aid Training, Supplies, and Emergency Notification Numbers.
- Chapter 14 Sources of Information [Go to Page]
- 14.1 General.
- 14.2 Legal Considerations.
- 14.3 ASTM Standards for Collecting, Preserving, and Evaluating Data.
- 14.4 Forms of Information.
- 14.5 Sources of Non-Scene Data.
- 14.6 Private Sources of Information.
- Chapter 15 Planning the Investigation [Go to Page]
- 15.1 Introduction.
- 15.2 Basic Incident Information.
- 15.3 Organizing the Investigation Functions.
- 15.4 Pre-InvestigationPreinvestigation Team Meeting.
- 15.5 Specialized Personnel and Technical Consultants.
- 15.6 Case Management.
- Chapter 16 Documentation of the Investigation [Go to Page]
- 16.1 Introduction.
- 16.2 Photography.
- 16.3 Note Taking.
- 16.4 Diagrams and Drawings.
- 16.5 Reports and Testimony.
- Chapter 17 Physical Evidence [Go to Page]
- 17.1 General.
- 17.2 Physical Evidence.
- 17.3 Preservation of the Fire Scene and Physical Evidence.
- 17.4 Contamination of Physical Evidence.
- 17.5 Methods of Collection.
- 17.6 Evidence Containers.
- 17.7 Canine-Handler Teams Introduction.
- 17.8 Identification of Physical Evidence.
- 17.9 Transportation and Storage of Physical Evidence.
- 17.10 Chain of Custody of Physical Evidence.
- 17.11 Examination and Testing of Physical Evidence.
- 17.12 Evidence Disposition.
- Chapter 18 Origin Determination [Go to Page]
- 18.1 Introduction.
- 18.2 Overall Methodology.
- 18.3 Data Collection for Origin Determination.
- 18.4 Analyze the Data.
- 18.5 Developing Origin Hypotheses.
- 18.6 Testing an Origin Hypothesis for Validity.
- 18.7 Selecting the Final Hypothesis.
- 18.8 Origin Insufficiently Defined.
- Chapter 19 Fire Cause Determination [Go to Page]
- 19.1 Introduction.
- 19.2 Overall Methodology.
- 19.3 Data Collection for Fire Cause Determination.
- 19.4 Analyze the Data.
- 19.5 Developing Cause Hypotheses.
- 19.6 Testing the Cause Hypothesis for Validity.
- 19.7 Selecting the Final Hypothesis.
- 19.8 Fire Incident and Cause Classifications.
- Chapter 20 Analyzing the Incident for Cause and Responsibility [Go to Page]
- 20.1 General.
- 20.2 The Cause of the Fire or Explosion.
- 20.3 The Cause of Damage to Property Resulting from the Incident.
- 20.4 The Cause of Bodily Injury or Loss of Life.
- 20.5 Determining Responsibility.
- Chapter 21 Failure Analysis and Analytical Tools [Go to Page]
- 21.1 Introduction.
- 21.2 Time Lines.
- 21.3 Systems Analysis.
- 21.4 Mathematical Modeling.
- 21.5 Fire Testing.
- 21.6 Data Required for Modeling and Testing.
- Chapter 22 Explosions [Go to Page]
- 22.1 General.
- 22.2 Types of Explosions.
- 22.3 Characterization of Explosion Damage.
- 22.4 Effects of Explosions.
- 22.5 Factors Controlling Explosion Effects.
- 22.6 Seated Explosions.
- 22.7 Nonseated Explosions.
- 22.8 Gas/Vapor Combustion Explosions.
- 22.9 Dust Explosions.
- 22.10 Backdraft (Smoke Explosions).
- 22.11 Unconfined Vapor Cloud Explosions.
- 22.12 Explosives.
- 22.13 Investigation of Explosive Incidents.
- 22.14 Investigating the Explosion Scene.
- 22.15 Analyze Origin (Epicenter).
- 22.16 Analyze Fuel Source.
- 22.17 Analyze Ignition Source.
- 22.18 Analyze to Establish Cause.
- Chapter 23 Incendiary Fires [Go to Page]
- 23.1 Introduction.
- 23.2 Incendiary Fire Indicators.
- 23.3 Potential Indicators Not Directly Related to Combustion.
- 23.4 Other Evidentiary Factors.
- Chapter 24 Fire and Explosion Deaths and Injuries [Go to Page]
- 24.1 General.
- 24.2 Mechanisms of Death and Injury.
- 24.3 Consumption of the Body by Fire.
- 24.4 Postmortem Changes.
- 24.5 Investigating Fire Scenes with Fatalities.
- 24.6 Investigating Fire Scenes with Injuries.
- 24.7 Explosion Deaths and Injuries.
- 24.8 Post Scene Investigation of Injuries.
- 24.9 Fire Death Pathological and Toxicological Examination.
- 24.10 Analysis of Data.
- Chapter 25 Appliances [Go to Page]
- 25.1 Scope.
- 25.2 Appliance Scene Recording.
- 25.3 Origin Analysis Involving Appliances.
- 25.4 Cause Analysis Involving Appliances.
- 25.5 Appliance Components.
- 25.6 Common Residential Appliances.
- Chapter 26 Motor Vehicle Fires [Go to Page]
- 26.1 Introduction.
- 26.2 Vehicle Investigation Safety.
- 26.3 Fuels in Vehicle Fires.
- 26.4 Ignition Sources.
- 26.5 System Identification and Function.
- 26.6 Body Systems.
- 26.7 Motor Vehicle Fire Scenes.
- 26.8 Motor Vehicle Examinations.
- 26.9 Total Burns.
- 26.10 Special Considerations for Incendiary Vehicle Fires.
- 26.11 Vehicle Ignition Components.
- 26.12 Vehicles in Structures.
- 26.13 Recreational Vehicles.
- 26.14 Heavy Equipment.
- 26.15 Agricultural Equipment and Implements Introduction.
- 26.16 Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs).
- 26.17 Towing Considerations.
- 26.18 Hydrogen-Fueled Vehicles.
- Chapter 27 Wildfire Investigations [Go to Page]
- 27.1 Introduction.
- 27.2 Scope.
- 27.3 Purpose.
- 27.4 Terminology Specific to Wildfire Investigations.
- 27.5 Basic Methodology.
- 27.6 Fire Science.
- 27.7 Fire Pattern Indicator.
- 27.8 Safety.
- 27.9 Determining the Origin Area.
- 27.10 Determining the Cause.
- Chapter 28 Management of Complex Investigations [Go to Page]
- 28.1 Scope.
- 28.2 Basic Information and Documents.
- 28.3 Communications Among Interested Parties.
- 28.4 Understandings and Agreements.
- 28.5 Management of the Investigation.
- 28.6 Evidence.
- 28.7 Logistics.
- 28.8 Site and Scene Safety.
- Chapter 29 Marine Fire Investigations [Go to Page]
- 29.1 Introduction.
- 29.2 Marine Vessel Terminology and Navigational Concepts.
- 29.3 Vessel Investigation Safety.
- 29.4 System Identification and Function.
- 29.5 Exterior.
- 29.6 Interior.
- 29.7 Propulsion Systems.
- 29.8 Ignition Sources.
- 29.9 Documenting Vessel Fire Scenes.
- 29.10 Vessel Examination.
- 29.11 Vessels in Structures.
- 29.12 Legal Considerations.
- Annex A Explanatory Material
- Annex B Bibliography
- Annex C Informational References
- Annex D Photograph Credits [Go to Page]