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1、 The Institute of Electrical and Electronics Engineers, Inc. 345 East 47th Street, New York, NY 10017-2394, USA Copyright 1996 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 1996. Printed in the United States of America. ISBN 1-55937-780-1 No part of th
2、is publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. IEEE Std 848-1996 IEEE Standard Procedure for the Determination of the Ampacity Derating of Fire-Protected Cables Sponsor Insulated Conductors Committe
3、e of the IEEE Power Engineering Society Approved 5 August 1996 IEEE Standards Board Abstract: A detailed test procedure is provided for determining the ampacity or derating factor in the following cable installation configurations: block-out or sleeve type cable penetration fire stops; conduits cove
4、red with a protective material; tray covered with a protective material; cable directly covered or coated with a fire-retardant material; and free-air drops enclosed with a protective ma- terial. Keywords: ampacity derating factor, cable penetration fire stops, electrical separation wrap systems, fi
5、re-protected cable system, fire protected conduits Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 22:06:11 MDTNo reproduction or networking permitted with
6、out license from IHS -,-,- IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinat- ing Committees of the IEEE Standards Board. Members of the committees serve voluntarily and without compensation. They are not necessarily members of the Institute. The standards
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17、h respect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying all patents for which a license may be required by an IEEE standard or for conducting inquiries into the legal validity or scope of those patents that are brought to
18、 its attention. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 22:06:11 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Intr
19、oduction (This introduction is not part of IEEE Std 848-1996, IEEE Standard Procedure for the Determination of the Ampacity Derating of Fire-Protected Cables.) Many cable installations in nuclear and fossil fuel generating stations require the installation of fi re stop, fi re protective materials,
20、coating, and electrical separation wrap materials over the cables or the raceway for fi re protection or electrical separation purposes. Appendix R of the Code of Federal Regulations for Nuclear Equipment may require some electrical circuits enclosed in a fi re-protective material. IEEE Std 634-1976
21、 specifi es requirements for cable penetration fi re stops at fi re rated walls and fl oors. Compliance with IEEE Std 384-1992 may require installation of a wrap material over free air-drop cables or solid covers on cable trays. Building codes for commercial and industrial facilities in some states
22、require power cables, used in emer- gency power systems, to remain functional during a fi re exposure. This may also necessitate the use of the fi re protective material. As discussed in IEEE Std 690-1984, utility generating stations use cable ampacities provided in IEEE 835- 1994 for conduits, spac
23、ed cable tray installations, and duct bank installations. NEMA WC51-1991/ICEA P- 54-440 is used for cable installation in random fi lled open-top trays. Commercial, industrial, and non-utility owned generating stations utilize cable ampacities published in NFPA 70-1996, National Electric Code (NEC).
24、 The NEC permits the use of IEEE Std 835-1994 and NEMA WC51-1991/ICEA P-54-440 under the direction of engineers. Fire-protection related products may reduce the heat transfer characteristics associated with the ampacities provided in IEEE Std 835-1994 and NEMA WC51-1991/ICEA P-54-440. In future revi
25、sions, these ampacity standards may incorporate these new installation conditions on cable ampacity. Not all products, however, may be covered by changes in the ampacity standards due to their limited use to the generating station market. Hence, ampacity testing to determine ampacity derating of fi
26、re-protected cable systems is necessary. Several analytical cable ampacity methods are listed in the bibliography to address fi re stops, tray enclosure materials, and cable wrap material. The user may consider the applications of these analytical methods to avoid testing of minor differences in the
27、 installation of a given product. This standard was prepared by the Task Group on Procedure for the Determination of the Ampacity Derating of Fire Protected Cables of the Subcommittee on Tests and Measurements of the Insulated Conductors Com- mittee. The membership of the working group during the pr
28、eparation of this draft was: A. K. Gwal, Chair J. L. White, Jr. , Vice Chair T. J. Al-Hussaini P. Bhatia K. Brown E. A. Capouch E. J. Coffey E. J. DAquanno J. Daly P. A. Giaccaglia A. Hiranandani R. Jenkins A. E. Kollar R. Light J. E. Merando K. A. Petty K. W. Prier D. N. Priest P. D. Skelly M. Spur
29、lock W. Torok J. R. Tuzinski F. W. Van Nest J. G. Waligorski Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 22:06:11 MDTNo reproduction or networking perm
30、itted without license from IHS -,-,- iv The following persons were on the balloting committee: T. J. Al-Hussaini R. W. Allen, Jr. W. O. Anderson, Jr. R. H. Arndt T. P. Arnold Hussein E. Badaly T. A. Balaska Anthony Barlow Charles W. Blades David T. Bogden Vincent J. Boliver R. R. Borowski Ken E. Bow
31、 John E. Bramfi tt M. D. Buckweitz R. R. Burghardt Paul S. Cardello Paul L. Cinquemani Wayne E. Cole E. J. DAquanno J. M. Daly Russ Dantzler Joseph A. Di Stanzo C. Doench J. P. Dupont G. S. Eager, Jr. R. M. Eichhorn J. S. Englehardt S. L. Fitzhugh A. Fitzpatrick E. O. Forster Ronald F. Frank R. D. F
32、ulcomer J. B. Gardner R. B. Gear Paul Giaccaglia A. Godoshian A. Gwal V. Stan Harper R. Hartlein H. C. Hervig S. V. Heyer R. W. Higginbottom L. J. Hiivala Asit K. Hiranandi John W. Hoffman Darrel R. Jeter C. Katz L. J. Kelly F. E. Kimsey Joel Kitchens H. T. Knox Frederick B. Koch Albert Kong Donald
33、E. Koonce M. Kopchik, Jr. Frank L. Kuchta F. E. La Gase Jeffrey J. La Marca Carl Landinger J. S. Lasky Jack H. Lawson Raoul H. Leuteritz T. H. Ling John V. Lipe Mark E. Lowell G. Ludasi R. Luther G. J. Luzzi Jeffrey P. Mackevich G. Allen MacPhail M. A. Martin, Jr. I. J. Marwick M. S. Mashikian S. G.
34、 Mastoras F. M. McAvoy A. R. McCulloch E. J. McGowan A. L. McKean W. J. Mc J. D. Medek David J. Mintz J. A. Moran, Jr. D. J. Nichols Harry E. Orton J. J. Pachot Cutter D. Palmer Keith A. Petty James J. Pickering Jan S. Pirrong Gary A. Polhill Ronald J. Ponist Paul F. Pugh Peter Ralston Greg P. Rampl
35、ey Robert A. Resuali R. B. Robertson Ralph W. Samm George W. Seman John F. Shimshock Gilbert L. Smith Joseph H. Snow T. F. Stabosz Joseph L. Steiner Grover L. Stell, Jr. Frank M. Stepniak Orloff W. Styve Mike D. Sweat W. Keith Switzer John Tanaka James W. Tarpey Frank A. Teti H. D. Thomas William A.
36、 Thue Austin C. Tingley William Torok Duc B. Trinh S. E. Turner Jack R. Tuzinski Donald A. Voltz C. F. Von Hermann, Jr. Richard L. Votoupal Michael L. Walker Steven P. Walldorf Edward M. Walton Daniel J. Ward Roland H. W. Watkins A. C. Westrom Charles A. White John L. White, Jr. William D. Wilkens R
37、obert O. Wilkinson J. A. Williams William G. Wimmer J. T. Zimnoch Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 22:06:11 MDTNo reproduction or networking
38、 permitted without license from IHS -,-,- v The fi nal conditions for approval of this standard were met on 5 August 1996. This standard was condition- ally approved by the IEEE Standards Board on 20 June 1996, with the following membership: Donald C. Loughry, Chair Richard J. Holleman, Vice Chair A
39、ndrew G. Salem, Secretary *Member Emeritus Also included are the following nonvoting IEEE Standards Board liaisons: Satish K. Aggarwal Alan H. Cookson Chester C. Taylor Lisa S. Young IEEE Standards Project Editor Gilles A. Baril Clyde R. Camp Joseph A. Cannatelli Stephen L. Diamond Harold E. Epstein
40、 Donald C. Fleckenstein Jay Forster* Donald N. Heirman Ben C. Johnson E. G. “Al” Kiener Joseph L. Koepfi nger* Stephen R. Lambert Lawrence V. McCall L. Bruce McClung Marco W. Migliaro Mary Lou Padgett John W. Pope Jose R. Ramos Arthur K. Reilly Ronald H. Reimer Gary S. Robinson Ingo Rsch John S. Rya
41、n Chee Kiow Tan Leonard L. Tripp Howard L. Wolfman Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=OConnor, Maurice Not for Resale, 04/28/2007 22:06:11 MDTNo reproduction or networking permitted with
42、out license from IHS -,-,- vi Contents CLAUSEPAGE 1.Overview1 1.1 Scope1 1.2 Purpose.1 2.References2 3.Definitions2 4.Test Description.3 4.1 General.3 4.2 Test specimensprotected cable systems.3 4.3 Test specimenscable penetration fire stop .5 4.4 Test facility 6 4.5 Test procedure11 5.Evaluation of
43、 test results14 5.1 Normalizing test results .14 5.2 Ampacity derating factor .14 6.Documentation of testing.15 ANNEX Annex A (informative) Bibliography.16 Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001,
44、User=OConnor, Maurice Not for Resale, 04/28/2007 22:06:11 MDTNo reproduction or networking permitted without license from IHS -,-,- IEEE Standard Procedure for the Determination of the Ampacity Derating of Fire-Protected Cables 1. Overview 1.1 Scope This standard provides a detailed test procedure f
45、or determining the ampacity or derating factor in the fol- lowing cable installation confi gurations: Block-out or sleeve type cable penetration fi re stops Conduits covered with a protective material Tray covered with a protective material Cable directly covered or coated with a fi re-retardant mat
46、erial Free-air drops enclosed with a protective material The standard is applicable to cables installed and sized to IEEE Std 835-1994 for conduits and free-air drops, and NEMA WC51-1991/ICEA P-54-440 for cable tray. 1 IEEE Std 835-1994 does provide ampacities for cables in a tray with a fi xed spac
47、ing and may be used for cable penetration fi re stop confi gurations only. This standard does not endorse the use of or provide application guidance for the installation of cable pene- tration fi re stops and fi re-protective materials. Cable designs are available that can withstand and remain funct
48、ional during direct exposure to a fi re. The user should refer to IEEE Std 634-1978 for the qualifi cation requirements of cable penetration fi re stops. 1.2 Purpose The purpose of this standard is to provide a test procedure for use in establishing the ampacity or ampacity derating factor for cable
49、s installed in fi re-protected conduits, trays, or free-air drops, cable penetration fi re stops, or electrical separation wrap systems. 1 Information on references can be found in clause 2. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/111111100