IEEE-848-1996-R2003.pdf
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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
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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
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