Summary of Topics b0048_15_20120723_sum.htmlSubject 48
Bulletin Dated: July 23, 2012
SUMMARY OF TOPICS
The following changes in requirements to the Standard for Electric Signs, UL 48, are being proposed for preliminary review and comment only:
1. For Preliminary Review Only: Revisions to Table 4.2 and Table 4.3 to re-establish minimum metal thickness values for steel, aluminum, copper, and aluminum and copper based alloys similar to those values in the 14th edition of UL 48.
2. For Preliminary Review Only: Revision of the requirements in 4.1.5.3.1 for screws secured to sheet metal less than 1.27-mm (0.50-in) thick, including deletion of the Self-Threading Screw Torque Test (5.20) for this specific screw application.
3. For Preliminary Review Only: Revision and clarification of the permitted use of self-drilling thread cutting and thread forming screws in 4.1.5.3.3 and addition of 4.1.5.3.4.
4. For Preliminary Review Only: Revision and clarification of the minimum wire size requirements for internal connection to a branch circuit conductor in 4.2.5.2.1 to correspond to the value in the 14th Edition.
5. For Preliminary Review Only: Deletion of the detailed specifications for the container holding the test water in 5.9.1 to re-establish the same or greater test flexibility previously permitted under the 14th Edition of UL 48.