UL 1778-2005 连续电源系统.pdf

UL1778 isbn0-7629-1111-5 Uninterruptible Power Systems FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION SEPTEMBER 15 .2005-UL 1778 Underwriters Laboratories Inc .( UL) 333 Pfingsten Road Northbrook ,IL 60062-2096 UL Standard for Safety for Uninterruptible Power Systems ,UL 1778 Fourth Edition ,Dated September 15 ,2005 Summary of Topics This fourth edition of ANSI /UL1778 has been issued to incorporate several revisions from the technical harmonization mittee ( THC),UL ,and CSA The new requirements are substantially in accordance with UL's Bulletin ()onthis subject dated August 31 ,2004 and June 15 ,2005 .The bulletin ()is now obsolete and may be discarded As indicated on the title page ( page1 ),this UL Standard for Safety is an American National Standard . Attention is directed to the note on the title page of this Standard outlining the procedures to be followed to retain the approved text of this ANSI /Standard The UL Foreword is no longer located within the UL Standard .For information concerning the use and application of the requirements contained in this Standard ,the current vers...