UL 508C-2002 国外国际规范.pdf

UL 508C Power Conversion Equipment FEBRUARY 15, 2008 − UL 508C tr1 Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook, IL 60062-2096 UL Standard for Safety for Power Conversion Equipment, UL 508C Third Edition, Dated May 3, 2002 Revisions: This Standard contains revisions through and including February 15, 2008. Summary of Topics Revisions to the third edition of UL 508C are being published to incorporate requirements for the following topics: 1. Removable covers giving access to fuses and other overload protective devices 2. Conducting short circuit testing on drives with solid state detection circuitry with only one type of branch circuit protective device in order to cover all BCP devices 3. Grounding type attachment plugs 4. Knockouts 5. Short circuit testing of all drives incorporating solid state protection circuitry 6. Miscellaneous revisions Text that has been changed in any manner is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The following table lists the future effective dates with the corresponding reference. Future Effective Dates References February 15, 2010 Paragraphs 27.4.3, 27.6.1, 45.1.1, 64C.1, and Table 27.2 The new and revised requirements are substantially in accordance with UL’s Proposal(s) on this subject dated February 2, 2007 and August 10, 2007. The revisions dated February 15, 2008 include a reprinted title page (page1) for this Standard. A