UL 20-2008 Genernal-use snap switch.pdf
文档页数：88文档大小：1.06MB文档格式：pdfUL UL 20⑧ Underwriters Laboratories Inc . Standard for SafetyGeneral-Use Snap SwitchesCOPYRIGHTED MATERIALNOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis PDF Standard downloaded from. . DECEMBER 12 .2008 UL 20Underwriters Laboratories Inc .( UL) 333 Pfingsten RoadNorthbrook .IL 60062-2096UL Standard for Safety for General-Use Snap Switches ,UL 20Twelfth Edition ,Dated September 22 ,2000Revisions :This Standard contains revisions through and including December 12 ,2008 . Summary of TopicsThis revision of ANSI /UL20 includes the following changes in requirements : Clarification of 347 V Endurance TestContact Sticking AC SwitchesGrounding Symbol With or Without the CircleText that has been changed in any manner is marked with a vertical line the margin . The revised requirements are substantially in accordance with UL's Proposal (s)onthis subject dated June27,2008. The revisions dated December 12 ,2008 include a reprinted title page ( page1)for this StandardAs indicated on the title page ( page1 ),this UL Standard for Safety is an American National StandardAttention is directed to the note on the ti...
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