Subject 1581

Bulletin Dated: August 9, 2007

SUMMARY OF TOPICS

The following is being proposed for preliminary review and comment only:

1. For Preliminary Review Only: Revision to Mandrel Requirements to Permit the Use of Smaller Sized Mandrels

2. For Preliminary Review Only: Specification of Nichrome Support Wire for Repeated Flame Tests

3. For Preliminary Review Only: Correction of Inadvertent Omission of Char Length Requirements from Horizontal Specimen/FT2 Flame Test

4. For Preliminary Review Only: Substantive Revisions to UL 1581 Including a) Deletion of Tables Containing Redundant Materials Requirements; b) Revisions to Materials Tables Including i) Revision of SI Units for Tensile Strength; ii) Deletion of Fahrenheit Temperature from Wire and Cable Temperature Ratings; iii) Deletion of Class Number for Material Identification, and iv) Miscellaneous Revisions for Consistency with Other Wire and Cable Standards and Requirements; and c) Establishment of New 7-Day Aging Requirements for 105 C Type EPDM and 90 C Type FRPE

5. For Preliminary Review Only: Revision and Deletion of Requirements in UL 1581 Due to the Publication of UL 2556 and Miscellaneous Editorial Corrections and Clarifications