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UL 1581 ISBN 0-7629-0163-2 Reference Standard for Electrical Wires, Cables, and Flexible Cords JULY 19, 2000 − UL 1581 tr1 Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook, IL 60062-2096 UL Standard for Safety for Electrical Wires, Cables, and Flexible Cords, UL 1581 Third Edition, Dated October 1, 1997 Revisions: This Standard contains revisions through and including July 19, 2000. UL is in the process of converting its Standards for Safety to the Standard Generalized Markup Language (SGML), and implementing an SGML compliant document management and publishing system. SGML - an international standard (ISO 8879-1986) - is a descriptive markup language that describes a document’s structure and purpose, rather than its physical appearance on a page. Significant benefits that will result from UL’s use of SGML and these new systems include increased productivity, reduced turnaround times, and data and information consistency, reusability, shareability, and portability. However, the fonts, pagination, and general formatting of UL’s new electronic publishing system differ from that of UL’s previous publishing system. Consequently, when revision pages are issued for a Standard with the new publishing system, these differences may result in the printing of pages on which no requirements have been changed - these additional pages result from relocation of text due to repagination and reformatting of the Standard with the new publishing system. Text that has been changed in any manner is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effec