NEMA Publishes Cable Tray Standard Revision

NEMA, Rosslyn, Va., has published ANSI/NEMA WC 51-2009/ICEA P-54-440, "Ampacities of Cables Installed in Cable Trays." The standard was produced by the Energy Division Working Group 440 of the Insulated Cable Engineers Association (ICEA), Carrollton, Ga., and was last revised in 2003. WC 51/P-54-440 provides ampacity ratings for 600V to 15,000V solid dielectric cables installed in cable trays, tabulated for single conductor cables, triplexed assemblies of single conductor cables, and three-conductor cables incorporating an overall jacket.

In addition, the revision includes corrected values in Table 5-4 and editorial changes for clarity throughout the document. As in the previous edition, correction factors are provided to adjust the tabulated values for ambient and operating temperatures, cable construction, tray covers, and diversification of the cable loading.

“With these latest revisions, ANSI/NEMA WC 51/P-54-440 will be even more helpful to the electrical utility industry,” says E. J. Bartolucci, a member of the working group that revised the standard. “It is an informative, easy-to-reference resource for the complex task of establishing ampacity ratings of cables installed in cable trays.”

The contents and scope of ANSI/NEMA WC 51-2009/ICEA P-54-440 may be viewed by visiting the NEMA Web site. A copy of the revised standard may be purchased for $88 by calling (800) 854-7179.