1、 IEEE Standard Procedure for the Determination of the Ampacity Derating Factor for Fire-Protected Cable Systems Sponsored by the Insulated Conductors Committee IEEE 3 Park Avenue New York, NY 10016-5997 USA IEEE Power and Energy Society IEEE Std 848-2015(Revision ofIEEE Std 848-1996) IEEE Std 848-20
2、15 (Revision of IEEE Std 848-1996) IEEE Standard Procedure for the Determination of the Ampacity Derating Factor for Fire-Protected Cable Systems Sponsor Insulated Conductors Committee of the IEEE Power and Energy Society Approved 16 February 2015 IEEE-SA Standards Board Abstract: A detailed test pr
3、ocedure is provided for determining the ampacity derating factor in the following cable installation configurations: block-out or sleeve-type cable penetration fire stops; conduits covered with a protective material; tray covered with a protective material; cable directly covered or coated with a fi
4、re-retardant material; and free-air drops enclosed with a protective material. Keywords: ampacity derating factor, cable penetration fire stops, electrical separation wrap systems, fire-protected cable system, fire-protected conduits, IEEE 848 The Institute of Electrical and Electronics Engineers, I
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34、 the IEEE Standards Association. Participants At the time this IEEE standard was completed, the D3W Working Group had the following membership: Ajit K. Gwal, Chair Albert H. Spear III, Vice Chair Kent W. Brown Thomas C. Champion III Steven N. Graham Robert Konnik John E. Merando, Jr.The following me
35、mbers of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Ali Al Awazi Saleman Alibhay Kenneth Bow Kent W. Brown Nissen Burstein William Byrd Thomas C. Champion III Gary Donner Donald Dunn Steven N. Graham Randall Groves Aj
36、it K. Gwal Jeffrey Helzer Lee Herron Werner Hoelzl David Horvath Yuri Khersonsky Robert Konnik Jim Kulchisky Saumen Kundu Chung-Yiu Lam Philip Laudicina Michael Lauxman Arturo Maldonado William McBride John E. Merando, Jr. Jerry Murphy Michael Newman Lorraine Padden Bansi Patel Michael Roberts Barti
37、en Sayogo Gil Shultz Jeremy Smith Jerry Smith Albert H. Spear III Nagu Srinivas Gary Stoedter David Tepen Peter Tirinzoni John Vergis Yingli Wen Kenneth White John Yale Jian Yu Dawn Zhao When the IEEE-SA Standards Board approved this standard on 16 February 2015, it had the following membership: Joh
38、n Kulick, Chair Jon Walter Rosdahl, Vice Chair Richard H. Hulett, Past Chair Konstantinos Karachalios, Secretary Peter Balma Farooq Bari Ted Burse Clint Chaplin Stephen Dukes Jean-Philippe Faure Gary Hoffman Michael Janezic Jeffrey Katz Joseph L. Koepfinger* David J. Law Hung Ling Oleg Logvinov T. W
39、. Olsen Glenn Parsons Ron Petersen Adrian Stephens Peter Sutherland Yatin Trivedi Phil Winston Don Wright Yu Yuan *Member Emeritus Julie Alessi IEEE-SA Content Production and Management Malia Zaman IEEE-SA Operational Program Management Copyright 2015 IEEE. All rights reserved. vi Introduction This
40、introduction is not part of IEEE Std 848-2015, IEEE Standard for Procedure for the Determination of the Ampacity Derating Factor for Fire-Protected Cable Systems. Many cable installations in nuclear and fossil fuel generating stations require the installation of a fire stop, fire-protective material
41、s/coatings, and electrical separation wrap materials over the cables or the raceway for fire protection or electrical separation purposes. Appendix R of the Code of Federal Regulations for Nuclear Equipment may require some electrical circuits enclosed in a fire-protective material. IEEE Std 634-200
42、4 specifies requirements for cable penetration fire stops at fire rated walls and floors. Compliance with IEEE Std 384-2008amay 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 req
43、uire power cables, used in emer-gency power systems, to remain functional during a fire exposure. This may also necessitate the use of the fire-protective material. Utility generating stations use cable ampacities provided in IEEE Std 835-1994 and IEEE Std 135 for conduits, spaced cable tray install
44、ations, and duct bank installations. NEMA WC51-2009/ICEA P-54-440 is used for cable installation in random filled open-top trays. Commercial, industrial, and non-utility owned generating stations utilize cable ampacities published in NFPA 70-2011, National Electric Code (NEC). The NEC permits the us
45、e of IEEE Std 835-1994 and NEMA WC51-2009/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 WC51-2009/ICEA P-54-440. In future revisions, these ampacity s
46、tandards may incorporate the effects of 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 fire-protec
47、ted cable systems is necessary. Several analytical cable ampacity methods are listed in the bibliography to address fire 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 installat
48、ion of a given product. aInformation on references can be found in Clause 2. Copyright 2015 IEEE. All rights reserved. vii Contents 1. Overview 1 1.1 Scope . 1 1.2 Purpose 2 2. Normative references 2 3. Definitions 2 4. Test description 3 4.1 General 3 4.2 Test specimensprotected cable systems . 3 4
49、.3 Test specimenscable penetration fire stop . 5 4.4 Test facility 6 4.5 Test procedure 11 5. Evaluation of test results .15 5.1 Normalizing test results 15 5.2 Ampacity derating factor 16 6. Documentation of testing.16 Annex A (informative) Bibliography 18 Copyright 2015 IEEE. All rights reserved. viii IEEE Standard for Procedure for the Determination of the Ampacity Derating Factor for Fire-Protected Cable Systems IMPORTANT NOTICE: IEEE Standards documents are not intended to ensure safety, security, health, or environmental protection, or ensure against interfe
