Quick Links. The cable ampacity assessment program calculates the derated ampacity based on the ambient and conductor temperatures. In addition, the user can either select the base temperature provided by the manufacturer or the operating temperature of the cable. The cable ampacity calculation module of ETAP provides the following cable fire protection options:. The cable ampacity calculation method based on ICEA P applies to cables in aboveground trays using calculated derating factors based on tray size, cable fill, and environment conditions.
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Email Address. Sign In. Ampacity of cables in single open-top cable trays Abstract: A mathematical thermal model that can predict the operating temperatures for cables when there is load diversity in single, horizontal, open-top cable trays is presented.
The model accommodates two different loading scenarios-one in which the heat load is distributed evenly across the cable tray cross-section and a second one which concentrates the heavily loaded cables along the center-line and surrounds them with more lightly loaded cables. The second model is designed to yield a maximum cable temperature and to account for the load diversity that exists in a realistically operated tray.
Temperature predictions provided by the model are compared with previous laboratory cable tray experiments and with data collected during a four year study in which cable temperatures were measured in an operating nuclear plant.
Reasons for differences between the field data and the computer results are discussed. Article :. Date of Publication: Oct DOI: Need Help?
ICEA P-54-440 Standard
All rights including translation into other languages, reserved under Universal Copyright Convention, the Berne Convention for the protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. This process brings together persons who have an interest in the topic covered by this publication. While NEMA and ICEA administers the process and establishes rules to promote fairness in the development of consensus, they do not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA and ICEA disclaims liability for personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA and ICEA disclaims and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA and ICEA do not undertake to guarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide.
ANSI NEMA WC 51-2009 ICEA P-54-440-2009 Ampacities of Cables Installed in Cable Trays