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NFPA 850 impact on the nature of the installation. Many of the specific
recommendations herein might require modification after
due consideration of all local factors involved.
Recommended Practice for Fire Protection for
1-4 Definitions.
Electric Generating Plants and High Voltage
1-4.1 Alternative Fuels. Solid fuels such as municipal solid
Direct Current Converter Stations waste (MSW), refuse derived fuel (RDF), biomass, rubber
tires, and other combustibles that are used instead of fossil
2000 Edition fuels (gas, oil, or coal) in a boiler to produce steam for the
generation of electrical energy.
NOTICE: An asterisk (*) following the number or letter des-
1-4.2* Approved. Acceptable to the authority having jurisdic-
ignating a paragraph indicates that explanatory material on
the paragraph can be found in Appendix A. tion.
Information on referenced publications can be found in 1-4.3* Authority Having Jurisdiction. The organization,
Chapter 10 and Appendix E. office, or individual responsible for approving equipment,
Changes other than editorial are indicated by a vertical rule
in the margin of the pages on which they appear. These lines materials, an installation, or a procedure.
are included as an aid to the user in identifying changes from 1-4.4 Barrier, Fire. A continuous membrane, either vertical
the previous edition.
or horizontal, such as a wall or floor assembly, that is designed
and constructed with a specified fire resistance rating to limit
the spread of fire and that will also restrict the movement of
Chapter 1 Introduction smoke. Such barriers can have protected openings.
1-4.5 Biomass. A boiler fuel manufactured by means of a pro-
1-1 Scope. This document provides recommendations (not cess that includes storing, shredding, classifying, and convey-
requirements) for fire prevention and fire protection for elec- ing of forest and agricultural byproducts (e.g., woodchips, rice
tric generating plants and high voltage direct current con- hulls, sugar cane).
verter stations, except as follows: nuclear power plants are
1-4.6 Combustible. Any material that does not comply with
addressed in NFPA 803, Standard for Fire Protection for Light
the definition of either noncombustible or limited combus-
Water Nuclear Power Plants; and hydroelectric plants are
tible.
addressed in NFPA 851, Recommended Practice for Fire Protection
for Hydroelectric Generating Plants. 1-4.7 Combustible Liquid. A liquid having a flash point at or
above 100°F (37.8°C). (See NFPA 30, Flammable and Combustible
1-2 Purpose. Liquids Code.)
1-2.1 This document is prepared for the guidance of those 1-4.8 Fire Loading. The amount of combustibles present in a
charged with the design, construction, operation, and protec- given area, expressed in Btu/ft2 (kJ/m2).
tion of fossil fueled (i.e., coal, gas, or oil) or alternative fueled
(i.e., municipal solid waste, refuse derived fuel, biomass, rub- 1-4.9 Fire Point. The lowest temperature at which a liquid in
ber tires, and other combustibles) steam electric generating an open container will give off sufficient vapors to burn once
plants, combustion turbine and internal combustion engine ignited. It generally is slightly above the flash point.
electric generating plants, and high voltage direct current 1-4.10 Fire Prevention. Measures directed toward avoiding
converter stations. the inception of fire.
1-2.2 This document provides fire prevention and fire protec- 1-4.11 Fire Protection. Methods of providing for fire control
tion recommendations for the safety of construction and oper- or fire extinguishment.
ating personnel, the physical integrity of plant components,
and the continuity of plant operations. 1-4.12 Fire Protection Rating. The time, in minutes or hours,
that materials and assemblies used as opening protection have
1-2.3 Nothing in this document is intended to restrict new
withstood a fire exposure as established in accordance with
technologies or alternative arrangements.
test procedures of NFPA 252, Standard Methods of Fire Tests of
1-3 Application. Door Assemblies, and NFPA 257, Standard on Fire Test for Window
and Glass Block Assemblies, as applicable.
1-3.1 This document is intended for use by persons knowl-
edgeable in the application of fire protection for electric gen- 1-4.13 Fire Rated Penetration Seal. An opening in a fire bar-
erating plants and high voltage direct current converter rier for the passage of pipe, cable, duct, and so forth, that has
stations. been sealed so as to maintain a barrier rating.
1-3.2 The recommendations contained in this document are 1-4.14 Fire-Resistant Fluid. A listed hydraulic fluid or lubri-
intended for new installations, as the application to existing cant that is difficult to ignite due to its high fire point and
installations might not be practicable. However, the recom- autoignition temperature and that does not sustain combus-
mendations contained in this document represent good tion due to its low heat of combustion.
industry practice and should be considered for existing instal-
1-4.15 Fire Resistance Rating. The time, in minutes or hours,
lations.
that materials or assemblies have withstood a fire exposure as
1-3.3 It should be recognized that rigid uniformity of generat- established in accordance with the test procedures of NFPA
ing station design and operating procedures does not exist 251, Standard Methods of Tests of Fire Endurance of Building Con-
and that each facility will have its own special conditions that struction and Materials.
2000 Edition
