JUNE 21, 2011？UL 263 tr1 UL Standard for Safety for Fire Tests of Building Construction and Materials, UL 263 Fourteenth Edition, Dated June 21, 2011 Summary of Topics This new edition of ANSI/UL 263 is being issued to re？ect the latest ANSI approval and to include the following revisions that were proposed on October 22, 2010 and February 4, 2011: ？ Added requirements for testing unrestrained loaded beam specimens. The new re