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 Recognized as an American Na
3、tional StandardAbstract: A detailed test procedure 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;
4、 cable directly covered or coated with a fire-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
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40、 All rights reserved. vi Introduction This 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 installati
41、on of a fire stop, fire-protective materials/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
42、 fire-protective material. IEEE Std 634-2004 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 a
43、nd industrial facilities in some states require 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
44、135 for conduits, spaced cable tray installations, 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
45、Electric Code (NEC). The NEC permits the use 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
46、-440. In future revisions, these ampacity standards 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
47、 determine ampacity derating of fire-protected 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 te
48、sting of minor differences in the installation 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
49、Test specimensprotected cable systems . 3 4.3 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 environm
