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There are 43 chapters and 4 annexes in NFPA 101.As for "major parts", you could consider the following general divisions:Chapters 1-4, 6-11 and 43 referred to as "fundamental" or "base chapters"Chapters 5 Performance based optionsChapters 12-42 Specific occupancy chaptersAnnexes A and B containing useful additional information(based upon preface of 2009 edition)
NFPA 1002 is the Standard for Driver Operator Professional Qualifications.
NFPA 101® "Life Safety Code®" includes "occupancy" chapters stating the specific requirements for marking of exits, Chapter 7 ("Means of Egress") specifies how signs should be configured, when required by an occupancy chapter (i.e., size, location, lighting, etc). These same exit marking specifications are inserted and cross-referenced in NFPA 1 Fire Code, Chapter 14.
The National Fire Protection Agency works to educate the public about fire other hazards as well as advocating for universal and effective building codes and standards. NFPA provides a large amount of safety information as well as training to reduce the burden of fire hazards.
NFPA 220: Standard on Types of Building Construction
NFPA 10
NFPA 70
Nfpa 1500)
NFPA 10: Standard for Portable Fire Extinguishers
The National Electrical Code® is published as NFPA 70, the NEC®, in addition to NFPA 70A for one- and two-family dwellings, NFPA 70B for Electrical Equipment Maintenance and NFPA 70E, the Standard for Electrical Safety in the Workplace®.
NFPA 704 for cyclohexane: 1-3-0
There are currently over 360 NFPA codes and standards