UL 60950-21, First Edition
Effective Date Information
Date of publication -- November 10, 2003; Revised -- April 23, 2007
Date of withdrawal of previous standards -- Since UL 60950-21, First Edition is the first edition of this Standard, new product submittals will be evaluated using all the requirements in UL 60950-21 First Edition as of the date of publication. Since similar requirements have been used to evaluate presently Listed products of this type, no review of presently Listed products is necessary.
Requirement effective date (RED) -- There presently are no active REDs for specific sub-clauses in UL 60950-21.
A UL Effective Date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard.