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1、 NFPA 499 Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas 2004 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization Copyright National
2、 Fire Protection Association Provided by IHS under license with NFPALicensee=Purdue University/5923082001 Not for Resale, 11/02/2006 02:52:55 MSTNo reproduction or networking permitted without license from IHS -,-,- IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA DOCUMENTS NOTICE AND DISCLAIMER OF
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23、d be sent to NFPA headquarters, addressed to the attention of the Secretary, Standards Council, NFPA, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101. For more information about NFPA, visit the NFPA website at www.nfpa.org. Copyright National Fire Protection Association Provided by IHS und
24、er license with NFPALicensee=Purdue University/5923082001 Not for Resale, 11/02/2006 02:52:55 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2004, National Fire Protection Association, All Rights Reserved NFPA 499 Recommended Practice for the Classification of Co
25、mbustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas 2004 Edition This edition of NFPA499, Recommended Practice forthe Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Proces
26、s Areas, was prepared by theTechnical Committee on Electrical Equipment in ChemicalAtmospheres and acted on by NFPA at its November Association Technical Meeting held November 1519, 2003, in Reno, NV. It was issued by the Standards Council on January 16, 2004, with an effective date of February 5, 2
27、004, and supersedes all previous editions. This edition of NFPA 499 was approved as an American National Standard on January 16, 2004. Origin and Development of NFPA 499 The Technical Committee on Electrical Equipment in Chemical Atmospheres began the development of NFPA 497B in 1989. The Technical
28、Committee based the diagrams in this document on various NFPAcodes and standards and on the accepted practices of the chemi- cal process industries. This was the first edition of this recommended practice, and it was adopted by the NFPA membership at the 1990 November Technical Meeting. In 1993, the
29、 Technical Committee on Electrical Equipment in Chemical Atmospheres combined the information on group classifications of dusts located in NFPA497M, Classifica- tion of Gases, Vapors, and Dusts for Electrical Equipment in Hazardous (Classified) Locations, and the information in NFPA 497B into an exp
30、anded version and renamed the document. The table information on dusts was expanded to include CAS numbers for clarity and user-friendliness. In 2001 the Technical Committee on Electrical Equipment in Chemical Atmospheres entered NFPA499 into the November 2003 revisions cycle. The 2004 edition has b
31、een signifi- cantly revised and reorganized for conformance with the 2003 NFPA Manual of Style. These organizational and editorial changes enhance the usability of this recommended practice. In addition,editorialchangeshavebeenmadetothetexttoharmonizewiththerequirementsof NFPA 70, National Electrica
32、l Code. 4991 Copyright National Fire Protection Association Provided by IHS under license with NFPALicensee=Purdue University/5923082001 Not for Resale, 11/02/2006 02:52:55 MSTNo reproduction or networking permitted without license from IHS -,-,- Technical Committee on Electrical Equipment in Chemic
33、al Atmospheres James G. Stallcup, Chair Keller, TX SE A. W. Ballard, Crouse-Hinds, NY M Rep. National Electrical Manufacturers Association Edward M. Briesch, Underwriters Laboratories Inc., IL RT Steven R. Carlson, Pharmacia Corporation, MI U William T. Fiske, Intertek Testing Services NA, Inc., NY
34、RT William G. Lawrence, Jr., FM Global, MA I Rep. FM Global/FM Research Robert Malanga, Union Camp Corporation, NJ U Joseph V. Saverino, Air Products and Chemicals, Inc., PA U Richard F. Schwab, Honeywell, Inc., NJ U Sukanta Sengupta, FMC Corporation, NJ U Andreas U. Spintzyk, GE Global Asset Protec
35、tion Services, OH I Rep. GE Global Asset Protection Services David B. Wechsler, The Dow Chemical Company, TX U Rep. American Chemistry Council Jack H. Zewe, Electrical Consultants Inc., LA SE Alternates Kerry L. McManama, Underwriters Laboratories Inc., IL RT (Alt. to E. M. Briesch) Samuel A. Rodger
36、s, Honeywell, Inc., VA U (Alt. to R. F. Schwab) James W. Stallcup, Jr., Keller, TX SE (Alt. to J. G. Stallcup) Dann Strube, Intertek Testing Services NA, Inc., IN RT (Alt. to W. T. Fiske) George H. St. Onge, Shelbyville, DE (Member Emeritus) Jeffrey S. Sargent, NFPA Staff Liaison This list represent
37、s the membership at the time the Committee was balloted on the final text of this edition. Since that time, changes in the membership may have occurred. A key to classifications is found at the back of the document. NOTE:MembershiponacommitteeshallnotinandofitselfconstituteanendorsementoftheAssociat
38、ionor any document developed by the committee on which the member serves. Committee Scope: This Committee shall have primary responsibility for documents on (1) developing data on the properties of chemicals enabling proper selection of electrical equipment for use in atmospheres containing flammabl
39、e gases, vapors or dusts; (2) making recommendations for the prevention of fires and explosions through the use of continuously purged, pressurized, explosion-proof, or dust-ignition-proof electrical equipment where installed in such chemical atmospheres. 4992CLASSIFICATION OF COMBUSTIBLE DUSTS AND
40、OF HAZARDOUS (CLASSIFIED) LOCATIONS FOR ELECTRICAL INSTALLATIONS 2004 Edition Copyright National Fire Protection Association Provided by IHS under license with NFPALicensee=Purdue University/5923082001 Not for Resale, 11/02/2006 02:52:55 MSTNo reproduction or networking permitted without license fro
41、m IHS -,-,- Contents Chapter 1Administration. 499 4 1.1Scope 499 4 1.2Purpose. 499 4 1.3Relationship to NFPA Codes and Standards. 499 4 Chapter 2Referenced Publications. 499 5 2.1General 499 5 2.2NFPA Publications 499 5 2.3Other Publication. 499 5 Chapter 3Definitions 499 5 3.1General 499 5 3.2NFPA
42、Official Definitions. 499 5 3.3General Definitions 499 5 Chapter 4Combustible Dusts 499 5 4.1National Electrical CodeCriteria. 499 5 4.2Behavior of Combustible Dusts 499 6 4.3Conditions Necessary for Ignition of a Combustible Dust. 499 6 4.4Dusts with Additional Hazards. 499 7 4.5Classification of C
43、ombustible Dusts 499 7 4.6Ignition of Dust Clouds. 499 7 4.7Ignition of Dust Layers 499 7 Chapter 5Classification of Class II (Combustible Dust) Locations. 49913 5.1General 49913 5.2Division 1 Classified Locations. 49913 5.3Division 2 Classified Locations. 49913 5.4Unclassified Locations. 49913 5.5E
44、xtent of Hazardous (Classified) Locations. 49914 5.6Discussion of Diagrams and Recommendations 49914 5.7Procedure for Classifying Areas. 49914 5.8Classification Diagrams 49915 Annex AExplanatory Material. 49919 Annex BInformational References. 49921 Index. 49922 4993CONTENTS 2004 Edition Copyright N
45、ational Fire Protection Association Provided by IHS under license with NFPALicensee=Purdue University/5923082001 Not for Resale, 11/02/2006 02:52:55 MSTNo reproduction or networking permitted without license from IHS -,-,- NFPA 499 Recommended Practice for the Classification of Combustible Dusts and
46、 of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas 2004 Edition IMPORTANT NOTE: This NFPA document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this document
47、and may be found under the heading “Important Notices and Dis- claimers Concerning NFPA Documents.” They can also be obtained on request from NFPA or viewed at www.nfpa.org/disclaimers. NOTICE: An asterisk (*) following the number or letter designating a paragraph indicates that explanatory material
48、 on the paragraph can be found in Annex A. Changes other than editorial are indicated by a vertical rule beside the paragraph, table, or figure in which the change occurred. These rules are included as an aid to the user in identifying changes from the previous edition. Where one or more complete paragraphs have been deleted, the de- letion is indicated by a bullet () between the paragraphs that remain. Areference in brackets following a section or paragraph indicates material that has been extracted from another NFPA document. As an aid to the user, Annex B lis