1、NFPA 262 Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces 2015 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471, USA An International Codes and Standards Organization 1/14ISBN: 978-145591046-5 (Print)ISBN: 978-145591092-2 (PDF)IMPORTANT NO
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29、te at www.nfpa.org. All NFPA codes and standards can be viewed at no cost at www.nfpa.org/freeaccess.Copyright 2014 National Fire Protection Association. All Rights Reserved.NFPA262Standard Method ofTest for Flame Travel and Smoke of Wires and Cables for Use inAir-Handling Spaces2015 EditionThis edi
30、tion of NFPA 262, Standard Method of Test for Flame Travel and Smoke of Wires andCables for Use in Air-Handling Spaces, was prepared by the Technical Committee on Fire Tests. Itwas issued by the Standards Council on November 11, 2014, with an effective date of Decem-ber 1, 2014, and supersedes all p
31、revious editions.This edition of NFPA 262 was approved as an American National Standard on December 1,2014.Origin and Development of NFPA 262The test procedure covered by this standard was originally developed by UnderwritersLaboratories Inc. and published as UL 910, Standard for Safety Test for Fla
32、me-Propagation andSmoke-Density Values for Electrical and Optical-Fiber Cables Used in Spaces Transporting EnvironmentalAir. It is an adaptation of the Steiner tunnel test (NFPA 255, Standard Method of Test of SurfaceBurning Characteristics of Building Materials; ASTM E84, Standard Test Method for S
33、urface BurningCharacteristics of Building Materials; UL 723, Tests for Surface Burning Characteristics of BuildingMaterials), which was designed to provide information for evaluating the potential for firespread along cables and wires housed in a plenum or other environmental space. The origi-nal 19
34、85 edition was reconfirmed in 1990. The 1994 edition contained minor editorialchanges.The 1999 edition was revised to reflect the practices that were used with this type of testapparatus and procedure. Revisions were made to the requirements associated with the firetest chamber transition, exhaust b
35、lower instrumentation, and data acquisition. The title andscope were editorially revised to reflect the true application of the test procedures, for thetesting of flame travel and optical density of smoke for wires and cables used in an air-handling space.The 2002 edition was revised to conform with
36、 NFPAs formatting requirements, in compli-ance with the provisions of the Manual of Style for NFPA Technical Committee Documents. Thechapters were reorganized to reflect the NFPA standard document format, metric conversionswere reviewed and revised, and some editorial clarifications were made.There
37、were no substantial changes in the 2007 edition.The 2011 edition was revised to create consistency with other test standards. Provisions onthe Standard Insulated Conductor Test were removed and replaced with an annex on Refer-ence Cable Tests (Annex D).There were no substantial changes in the 2015 e
38、dition.2621NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169.Technical Committee on Fire TestsBarry L. Badders, Jr., ChairSouthwest Research Institute, TX RTScott W. Adams, Park City Fire Service District,
39、 UT EFarid Alfawakhiri, American Iron and Steel Institute, ILMJesse J. Beitel, Hughes Associates, Inc., MD SEJames A. Burns, New York State Department, NY EGordon H. Damant, Inter-City Testing however, there is not necessarily arelationship between these measurements.1.3* Application.1.3.1 This test
40、 shall be designed to provide comparative testdata on insulated, jacketed, or both, electrical wires and cablesand optical fiber cables that are to be installed in ducts, ple-nums, and other spaces used to transport environmental airwithout being enclosed in raceways.1.3.2 Test data shall be used to
41、 evaluate the potential for thespread of fire along electrical cables or wires or along opticalfiber cables and to evaluate the potential for the developmentof high smoke levels in these spaces if the wires and cables areexposed to fire.1.3.3 This test method shall not be used to investigate circuit
42、integrity characteristics or other such functionality perfor-mance during or after the fire test.1.3.4 This test method shall not be used to investigate thetoxicity of the products of combustion or decomposition.1.4 Units.1.4.1 SI Units. Metric units of measurement in this standardare in accordance
43、with the modernized metric system knownas the International System of Units (SI).1.4.2 Primary and Equivalent Values. If a value for a measure-ment as given in this standard is followed by an equivalentvalue in other units, both values shall be regarded as comply-ing with the requirements.1.5 Summar
44、y of Test Method.1.5.1 This test method shall use the apparatus described inChapter 4 to determine flame travel distance and optical den-sity of smoke from insulated, jacketed, or both, electrical wiresand cables and optical fiber cables that are to be installed inducts, plenums, and other spaces us
45、ed to transport environ-mental air without being enclosed in raceways.1.5.2 The test method shall expose a set of wire or cablespecimens, 7.32 m (24 ft) long and installed on a horizontalladdertype cable tray, to a controlled air and flaming fireexposure in a fire test chamber.1.5.3 A special specim
46、en holder shall be used to expose thetest specimens.1.5.4 The specimen holder shall be filled with one layer oftest specimens.1.5.5 The specimens shall be exposed to a 86 kW (294,000 Btu/hr) fire, 1.37 m (4.5 ft) long, for a period of 20 minutes, with aninitial draft of 73 m/min (240 ft/min) through
47、 the chamber.1.5.6 During the test, flame travel distance and optical den-sity of smoke shall be measured, and peak and average opticaldensity of smoke shall be calculated.1.5.7 Optional measurements shall be permitted to includeheat and smoke release rates from the burning sample.Chapter 2 Referenc
48、ed Publications2.1 General. The documents or portions thereof listed in thischapter are referenced within this standard and shall be con-sidered part of the requirements of this document.2624 TEST FOR FLAME TRAVEL AND SMOKE OF WIRES AND CABLES FOR USE IN AIR-HANDLING SPACES2015 Edition2.2 NFPA Publi
49、cations. (Reserved)2.3 Other Publications.2.3.1 ANSI/UL Publications. Underwriters LaboratoriesInc., 333 Pfingsten Road, Northbrook, IL 60062-2096.ANSI/UL 723, Standard for Test for Surface Burning Character-istics of Building Materials, 2008, revised 2010.2.3.2 ASTM Publications. ASTM International, 100 Barr Har-bor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.ASTM C1186, Standard Specification for Flat Fiber-CementSheets, 2012.ASTM E84, Standard Test Method for Surface Burning Charac-teristics of Building Materials, 2013a.ASTM E136, Standard Test Method
