NDLI: Ampacity of cables in trays surrounded with fire barrier material

Content Provider	IEEE Xplore Digital Library
Author	Black, W.Z. Brown, K.W. Harshe, B.L.
Copyright Year	1986
Abstract	A computer program that is capable of calculating the ampacity of power cables in a single tray that is surrounded by a fire barrier system is described. The program is used to determine the effect of the fire barrier design on the ampacity of the cables for a wide variety of cable, tray and fire barrier conditions. The calculated ampacity values are compared to values published in the ICEA/NEMA P54-440 resulting in a fire barrier ampacity correction factor. This factor convenient and simple to use, because quantitatively shows how much the conductor current must be reduced when the tray is surrounded by fire barrier material. Ampacity correction factors are provided for different fire barrier thicknesses with differing thermal resistivities. The program is also used to perform a sensitivity study so that those conditions which most greatly affect the cable ampacity can be identified. Results predicted by the program are compared to data measured during an extensive experimental test program carried out by TVA. The computer-predicted ampacity values and tray temperatures are shown to compare well with values measured during the test program.
Sponsorship	IEEE Power Engineering Society
Starting Page	8
Ending Page	17
Page Count	10
File Size	961171
File Format	PDF
ISSN	08858977
Volume Number	14
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fires Cable insulation Temperature Equations Mechanical cables Thermal resistance Testing Heat transfer Conducting materials Conductors
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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