1970UL 60950-23-2016 UL Standard for Safety Information Technology Equipment - Safety - Part 23: Large Data Storage Equipment
2011UL 60950-23 BULLETIN-2011 UL Standard for Safety Information Technology Equipment - Safety - Part 23: Large Data Storage Equipment (COMMENTS DUE: DECEMBER 12@ 2011)
2007UL 60950-23 (ND)-2007 National Differences For UL 60950-23 Information Technology Equipment - Safety - Part 23: Large Data Storage Equipment (First Edition)
2007UL 60950-23-2007 UL Standard for Safety Information Technology Equipment - Safety - Part 23: Large Data Storage Equipment First Edition